What chart themes are available?

Four presets: minimal (clean light), minimal-dark (clean dark paper), astrocom (light version of the astro.com look), and astrocom-dark (dark version of the astro.com look). Underneath, four Kerykeion native CSS themes also work: light, dark, dark-high-contrast, classic. Pass theme=astrocom-dark for the most popular dark professional look. Each preset layers on top of a base Kerykeion CSS theme, so paper colors and zodiac sectors inherit cleanly.

Can I get an Astrocom-style chart?

Yes — set theme=astrocom (light) or theme=astrocom-dark. This combines four patches at once: axis_stroke_width=3.0 for thick AC/MC/DC/IC lines, axes_labels_position='outside' for labels just past the wheel, house_numbers_position='center' for the inner-ring house number layout, and a unified axis_color (#444444 light, #6b7280 dark). The output mimics the astro.com (Astrodienst) reference chart that traditional astrologers have read for 30+ years.

How do I customize axis thickness?

Pass axis_stroke_width as a float. 1.0 is the default (Kerykeion's pre-patch behavior). 3.0 matches the astrocom preset and the astro.com reference. 5.0+ works for wall-poster output. The parameter only affects the four axis cusps (AC at index 0, IC at 3, DC at 6, MC at 9). Other house cusps stay at 1px dashed at 0.4 opacity. Axis lines render solid at 0.9 opacity when this parameter is set.

Can I hide specific planets from aspect lines?

Yes — pass hide_points_in_aspects as an array of point names, e.g. ['Chiron','Mean_Lilith','Mean_South_Node']. These points stay visible on the wheel but the post-processor strips them from every aspect line in the SVG and removes their row from the aspect grid. Useful for embeds where you want a clean aspect view without removing minor bodies from the chart entirely. The post-processor runs after Kerykeion's makeTemplate(), so timing is consistent.

Does the API render Part of Fortune?

Yes. Add 'part_of_fortune' to active_points and three things happen: the day/night formula computes the position (ASC + Moon - Sun for day charts, ASC + Sun - Moon for night), the circled cross glyph renders on the wheel via the new Part_of_Fortune symbol in the SVG defs, and a Part of Fortune row appears in the aspect grid. We compute Part of Fortune aspects ourselves because upstream Kerykeion does not know the body exists. Works for natal and external-natal chart types today.

Do you support Uranian / Hamburg School planets?

Yes — all eight Uranian hypotheticals render natively: Cupido, Hades, Zeus, Kronos, Apollon, Admetos, Vulcanus, Poseidon. Add the names you want to active_points and the settings_builder injects each one's glyph and color config. They show up on the wheel and in the aspect grid like any other body. Combine with hide_points_in_aspects to draw the glyphs without the aspect noise, which matches the Hamburg School notation style.

Can I render synastry, transit, and composite charts?

Yes — one endpoint, four chart types: Natal, Synastry, Transit, Composite. The theme system applies to all of them, so theme=astrocom-dark gives you a dark astrocom-style synastry chart with both subjects' names in the dual-chart heading. Synastry and transit secondary subjects also get the patched house numbers and (when configured) their own Part of Fortune glyph. Cross-subject Part of Fortune aspects are on the roadmap.

Why did you vendor Kerykeion v4.26.3 instead of just importing it?

Importing pip Kerykeion meant we could not change axis behavior, add Part of Fortune, or patch the aspect logic without forking. We copied Kerykeion v4.26.3 into app/vendor/kerykeion_charts/, kept import paths compatible, and added a PATCHES.md that tracks every change. Now upstream upgrades are a deliberate code review instead of a silent breaking change in production. Every patch has a numbered tag (PATCH-01 through PATCH-04 plus PATCH-PartOfFortune) and a matching inline comment in the source.

Where do house numbers go with house_numbers_position='center'?

House numbers render in an inner ring at 78% of the wheel radius (r * 0.78), using 10px font with 0.7 fill-opacity. This is the astro.com layout. Default ('near_cusp' or null) keeps them at the original dropin offset next to each cusp with 14px font and 0.6 fill-opacity. For synastry and transit charts, the same shrink applies to the secondary subject's numbers — the transit-specific fill-opacity logic (0 for transit, 0.4 otherwise) is preserved.

What does hide_axes_visually do?

Pass an array of axis names (e.g. ['IC','DC']) and those axis lines are removed from the SVG, while the underlying calculations stay intact. The angles are still in the chart data, so aspect calculations and house positions stay correct — only the visible line is gone. Useful for minimal embeds where you want to show planets and signs without the cross of cardinal axes. This is currently a stub-level post-processor; full per-axis control is on the roadmap.

How fast does rendering take?

Typical render time stays under 500ms, worst case under 1 second. The vendored Kerykeion code path adds minimal overhead — the patches are mostly conditional branches in existing draw functions plus one post-processor pass on the SVG string. Cold-start time depends on Swiss Ephemeris file loading. Edge caching covers identical requests, so repeated chart generation for the same birth data returns near-instantly.

Which output formats do I get?

SVG is the primary output — everything the renderer does is SVG-native. PNG, JPEG, WebP, and PDF are available through format conversion endpoints. SVG is what you want for web embeds because it scales without quality loss and is small. Use PNG or JPEG when you need email-client compatibility (Outlook). PDF preserves vector quality for print. WebP is roughly 30% smaller than PNG for the same visual quality.

Can I override theme settings per request?

Yes — pass a custom_settings dict to override any chart setting on top of the theme. The merge is shallow: theme defaults load first, your custom_settings dict overrides on top, the result feeds into Kerykeion. You can also pass individual patch parameters (axis_stroke_width, axes_labels_position, etc.) directly — these always win over theme defaults. A theme is a starting point, not a constraint.

How much does Chart Rendering API cost?

Chart rendering costs 10 credits per request. The Ultra plan starts at $37/month for 55,000 credits (about 5,500 charts). Business plan is $99/month for 220,000 credits (about 22,000 charts). Free tier does not include chart rendering — only data endpoints. Enterprise plans get dedicated infrastructure and unlimited generation.

What house systems are supported?

23 house systems work with every theme and every chart type: Placidus, Whole Sign, Equal House, Koch, Regiomontanus, Campanus, Morinus, Porphyry, Topocentric, Alcabitius, Krusinski, Sripati, and 11 more. House system choice is independent from theme — you can render a Whole Sign chart in the astrocom-dark theme and the cusps draw correctly. Calculations use Swiss Ephemeris (NASA JPL data).

How accurate are the underlying calculations?

Sub-arcsecond accuracy for every planet, asteroid, and hypothetical body. The renderer is a thin layer on top of Swiss Ephemeris, which uses NASA JPL ephemeris data — the same source professional astronomy software relies on. Theme and customization parameters only affect visual output; the math is identical regardless of which theme you pick.

Are there timing wheels (age-bands, bi-wheel)?

Yes — SVG timing wheels live at /svg/timing/* as separate endpoints. The age-bands wheel renders life-phase rings around a natal chart. The bi-wheel renderer overlays one chart on another (e.g. transit over natal) with both rings visible. They share the same vendored Kerykeion core as the standard chart_svg endpoint, so theme presets and patch parameters apply.

How do I integrate this with my app?

It is a REST API. Send birth data (date, time, location), plus theme and any customization params, get an SVG string back. Works with any language — curl, JavaScript, Python, Ruby, PHP, Go. For web, drop the SVG into the page directly. For mobile apps, request PNG or WebP through the format conversion endpoints. Same auth, same rate limits, same credit model across all chart types.

Is there rate limiting on chart generation?

Rate limits depend on plan. Ultra (55,000 credits/month) covers most independent platforms. Business (220,000 credits) suits scaling apps. Enterprise plans run on dedicated infrastructure with no monthly cap. At 10 credits per chart, Ultra gives you ~5,500 charts/month and Business gives you ~22,000 — the cap is the credit pool, not a per-second rate limit.

Customizable SVG Charts

Chart Rendering API: Astrocom-Grade SVG, Your Rules

We vendored Kerykeion v4.26.3 so we can patch it.

The result: 3 theme presets, an Astrocom-style preset, 10+ chart parameters, Part of Fortune, Uranian planets, and natal/synastry/transit/composite from one endpoint.

View Demo

Theme Presets

10+

Custom Params

Astrocom

Reference Look

Uranian

Hypothetical Planets

2.1M+ charts rendered monthly

Used by 750+ platforms worldwide

Swiss Ephemeris precision guaranteed

Off-the-shelf Kerykeion output is fixed: same axes, same fonts, same look on every site
No way to mimic the Astrocom (Astrodienst) aesthetic that traditional astrologers expect
Aspect lines pile up — and you cannot hide specific points without removing them from the wheel
Part of Fortune is missing from upstream rendering (no glyph, no aspect row)
Axis lines (AC, MC, DC, IC) all render the same — no way to thicken them or change label position
Hamburg School and Uranian astrologers cannot show their hypothetical planets
House numbers stuck in one place; no inner-ring layout option

Transform with

3 theme presets: minimal, minimal-dark, astrocom-dark — pick a look in one parameter
Astrocom preset: thicker axes, outside AC/MC/DC/IC labels, centered house numbers — out of the box
10+ chart params: axis_stroke_width, axes_labels_position, house_numbers_position, axis_color, and more
hide_points_in_aspects: drop selected planets from aspect lines while keeping them on the wheel
hide_axes_visually: keep axes in calculations, hide them from the SVG
Part of Fortune: formula, glyph, aspect grid row — all rendered server-side
Hypothetical planets (Hamburg School / Uranian) render with their own glyphs
Natal, synastry, transit, composite — same endpoint, same theme system, dual-chart heading preserved

Chart Rendering Performance

Vendored Kerykeion v4.26.3 with our customization layer

Theme Presets

10+

Customization Params

SVG (post-processed)

Primary Output

<500ms

Render Time

Natal, Synastry, Transit, Composite

Chart Types

2.1M+

Monthly Renderings

Customizable SVG, From Theme Down to Single Axis

3 presets, 10+ params, Astrocom-grade output

Astrocom Theme Preset

One parameter (theme=astrocom) gives you the astro.com chart look — thick axes, outside AC/MC/DC/IC labels, centered house numbers, unified axis color.

Combines PATCH-01, PATCH-02, PATCH-03, PATCH-04 with #444444 axis color

Astrocom-Dark Theme

Dark counterpart of Astrocom — same structural patches, dark paper, unified axis color tuned for dark UIs.

axis_color=#6b7280, layers on Kerykeion dark.css

Minimal Theme

Clean light theme with muted aspect lines and plain zodiac sectors — for embeds that should not fight the page.

Layers on classic.css, no structural patches applied

Minimal-Dark Theme

Same minimal look on dark paper — works for dark UI without writing extra CSS.

Inherits dark.css paper and zodiac sector colors

axis_stroke_width Parameter

Control how thick the AC/MC/DC/IC axis cusps render. 1.0 default, 3.0 mimics astro.com, 5.0 for wall posters.

Float — applies only to axis cusps (indices 0, 3, 6, 9), solid line at 0.9 opacity

axes_labels_position Parameter

Place AC/MC/DC/IC labels outside the wheel (bold), in a small inner ring (medium weight), or hide them entirely.

Accepts 'outside' | 'center' | null — coordinate math reuses cusp offset formula

house_numbers_position Parameter

Render house numbers in an inner ring at 78% radius (astro.com style) or near each cusp (default).

Accepts 'center' | 'near_cusp' — also applies to synastry/transit secondary subject

Part of Fortune Glyph

Add 'part_of_fortune' to active_points — the circled cross glyph renders on the wheel and a Part of Fortune row shows in the aspect grid.

Day/night formula, id=23 to keep upstream indexed accesses stable

hide_points_in_aspects

Pass an array of point names to drop them from aspect lines and the aspect grid — without removing the glyphs from the wheel.

Post-processor on the SVG string — runs after Kerykeion makeTemplate()

hide_axes_visually

Keep AC/MC/DC/IC in the calculation but hide the lines from the SVG. Useful for clean embed views.

Stub-level post-processor — accepts axis name array

Hypothetical Planets

8 Uranian / Hamburg School hypotheticals — Cupido, Hades, Zeus, Kronos, Apollon, Admetos, Vulcanus, Poseidon — render with their own glyphs.

Add to active_points; settings_builder injects glyph + color config

Dual-Chart Heading

Synastry and transit charts keep their dual-subject heading across the renderer refactor — both names, both birth dates render above the wheel.

Preserved through ChartRenderer facade in app/services/chart_renderer/renderer.py

Composite Chart Type

Midpoint composite charts render through the same endpoint with the same theme system.

chart_type='Composite' on the unified ChartRenderer facade

Swiss Ephemeris Precision

NASA JPL ephemeris data drives every planetary position regardless of theme or chart type.

Sub-arcsecond accuracy for all celestial bodies

23 House Systems

Placidus, Whole Sign, Equal House, Koch, Regiomontanus, Campanus, Morinus, Porphyry, Topocentric, and 14 more.

House system selection independent from theme

Custom Settings Override

Pass a custom_settings dict to override any chart field per request — colors, glyph colors, paper colors, zodiac colors.

Merged on top of theme defaults; caller wins

What is Chart Rendering API? The Vendored-Kerykeion Story

3 theme presets, 10+ customization params, Astrocom-grade output, Part of Fortune, Uranian planets

Chart Rendering API turns birth data into a customizable SVG astrology chart. We vendored Kerykeion v4.26.3 into our own codebase so we could patch it — that gave us thicker axes, outside-ring axis labels, centered house numbers, a Part of Fortune glyph, hypothetical planet support, and a post-processor that can hide selected points from aspect lines. You get three theme presets out of the box (minimal, minimal-dark, astrocom-dark), 10+ chart parameters, and one endpoint that handles natal, synastry, transit, and composite charts. Render time stays under 500ms.

Why did we vendor Kerykeion v4.26.3 instead of importing it?

Kerykeion is a strong open-source chart library, but the upstream renderer is locked down: fixed axis widths, no Part of Fortune, no hooks for hiding points from aspect lines, and no path for Hamburg School hypothetical planets.

We copied the relevant modules into app/vendor/kerykeion_charts/ at version 4.26.3, kept the import surface compatible, and added a PATCHES.md that tracks every change.

Four numbered patches (PATCH-01 through PATCH-04) plus a Part of Fortune injection cover the new parameters.

Two themes that ship with the upstream library (light, dark, dark-high-contrast, classic) still work as base layers.

Our presets layer on top of those base CSS variables, so dark-mode paper colors, zodiac sector colors, and glyph colors inherit cleanly.

The vendor approach means every upstream upgrade is a code review — not a surprise breaking change in production.

Vendored Kerykeion v4.26.3 — we own the patch line

1 min read

Which theme should I pick: minimal, minimal-dark, or astrocom-dark?

Three presets cover most cases.

Minimal is a clean light theme: muted aspect lines, plain zodiac sectors, light paper.

Use it for blog embeds, social cards, and apps that want a chart that does not fight the rest of the page.

Minimal-dark inverts the paper to dark grey, keeps the aspect colors readable, and works for dark UIs.

Astrocom-dark is the dark counterpart of the Astrocom preset: thicker axes, outside-ring AC/MC/DC/IC labels, centered house numbers, unified axis color (#6b7280) — basically the Astrodienst chart look in a dark wrapper.

Pass theme=astrocom to get the light version, theme=astrocom-dark for dark, theme=minimal for a clean light look, or theme=minimal-dark for the same on dark.

You can still override any of the underlying parameters per request, so a theme is a starting point — not a cage.

3 presets: minimal, minimal-dark, astrocom-dark — plus astrocom (light)

1 min read

What is the Astrocom preset and why does it matter?

Astrocom is the look you see on astro.com — the Astrodienst chart that professional astrologers have been reading since the 90s.

It is the de facto reference style for the Western tradition: thick black axis lines, AC/MC/DC/IC labels just outside the wheel, house numbers in an inner ring instead of next to the cusps, and a single neutral axis color so the four cardinal directions do not fight each other.

The astrocom preset combines PATCH-01 (axis_stroke_width=3.0), PATCH-02 (axes_labels_position='outside'), PATCH-03 (house_numbers_position='center'), and PATCH-04 (axis_color='#444444' for light, '#6b7280' for dark).

Set theme=astrocom and you get all four at once.

For platforms targeting traditional astrologers, this preset alone is often the reason teams switch.

The classic Kerykeion theme has per-axis colors (orange/black/blue/red) which clashes with a more reserved layout — astrocom unifies them.

Astrocom preset = astro.com reference look in one parameter

1 min read

How do per-element parameters work?

Five parameters let you override the preset on a single request.

axis_stroke_width takes a float — 1.0 is default, 3.0 mimics astro.com, 5.0 is wall-poster thick.

axes_labels_position accepts 'outside' (just past the wheel, bold), 'center' (small inner ring, medium weight), or null (no axis labels — Kerykeion's pre-patch behavior).

house_numbers_position takes 'center' (small inner ring at 78% radius, 10px font, 0.7 opacity) or 'near_cusp' (default, 14px, next to each cusp).

hide_points_in_aspects takes an array of point names: pass ['Chiron','Lilith'] and Chiron and Lilith stay on the wheel but vanish from every aspect line and the aspect grid row.

hide_axes_visually takes an array of axis names: the AC stays in the calculation, but no line is drawn — useful for embeds where you want a clean wheel.

axis_color overrides the per-axis CSS variables with one unified color.

5 patch parameters: axis_stroke_width, axes_labels_position, house_numbers_position, hide_points_in_aspects, hide_axes_visually

1 min read

How does Part of Fortune render?

Upstream Kerykeion 4.26.3 does not know Part of Fortune exists.

It is not in the Planet literal, the AstrologicalSubject does not expose it, and the default celestial points config skips it.

Add 'part_of_fortune' to active_points and our renderer does three things: builds a synthetic Kerykeion celestial point from the standard day/night formula (ASC + Moon - Sun for day, ASC + Sun - Moon for night), injects it into the celestial points config with id=23 so upstream indexed accesses do not shift, and computes Part of Fortune aspects ourselves (Kerykeion's NatalAspects would throw AttributeError on the missing attribute).

The chart_renderer SVG templates now ship with a Part_of_Fortune symbol — a circled cross — so xlink:href='#Part_of_Fortune' resolves.

The glyph shows on the wheel, the aspect row shows in the grid, and synastry/transit secondary subjects render their Part of Fortune too (cross-subject Part of Fortune aspects are not yet computed — that is on the roadmap).

Part of Fortune: formula, glyph, aspect grid row — all server-side

1 min read

Hypothetical planets for Hamburg School and Uranian astrology

The Uranian system (Witte, Sieggrun, Alfred Witte's Hamburg School) uses eight hypothetical planets beyond Pluto: Cupido, Hades, Zeus, Kronos, Apollon, Admetos, Vulcanus, and Poseidon.

Each has its own glyph in the SVG defs, its own sign and house position, and renders on the wheel with the same logic as Pluto or Chiron.

Add them to active_points and they show up.

For traditional astrologers running Uranian techniques alongside classical natal interpretation, this means one chart endpoint instead of two libraries duct-taped together.

Combine hypothetical planets with hide_points_in_aspects (e.g.

hide them from aspect lines while keeping the glyphs visible) and you get the Hamburg School notation style without writing a custom renderer.

Related: SVG timing wheels live at /svg/timing/* — age-bands wheel and bi-wheel renderers, separate from chart_svg but built on the same vendored core.

8 Uranian planets render natively — Cupido through Poseidon

1 min read

Use Cases

Traditional Astrologer Platforms

theme=astrocom delivers the astro.com chart look professionals already trust

Modern Dark-Mode Apps

theme=minimal-dark or astrocom-dark match dark UI without extra CSS work

Hellenistic Charts with Part of Fortune

Add 'part_of_fortune' to active_points — glyph and aspect row render automatically

Uranian / Hamburg School

8 hypothetical planets (Cupido through Poseidon) render with their own glyphs

Aspect-Focused Embeds

hide_points_in_aspects drops minor bodies from lines while keeping the wheel intact

Synastry, Transit, Composite

One endpoint, same theme system, dual-chart heading preserved across types

Technical Specifications

Renderer Base	Vendored Kerykeion v4.26.3 + 4 numbered patches
Theme Presets	minimal, minimal-dark, astrocom, astrocom-dark
Native Kerykeion Themes	light, dark, dark-high-contrast, classic
axis_stroke_width	Float — 1.0 default, 3.0 astrocom, up to 5.0
axes_labels_position	outside \| center \| null (no labels)
house_numbers_position	center (inner ring at r*0.78) \| near_cusp (default)
axis_color	Hex string — overrides per-axis CSS variables
hide_points_in_aspects	Array of point names — post-processor strips them from aspect lines
hide_axes_visually	Array of axis names — kept in calc, dropped from SVG
active_points	Includes part_of_fortune + 8 Uranian hypotheticals
Chart Types	Natal, Synastry, Transit, Composite (one endpoint)
Output Formats	SVG primary; PNG, JPEG, WebP, PDF via conversion
Render Time	<500ms typical, <1s worst case
House Systems	23 supported (Placidus, Whole Sign, Koch, etc.)
Calculation Precision	Swiss Ephemeris (NASA JPL data)
Custom Settings Override	custom_settings dict — any field, per request

Vendored Kerykeion + Patches vs Stock Kerykeion vs Closed Competitors

Feature	Astrology API	Others
Source Base	Vendored Kerykeion v4.26.3 — we own the patch line	Stock pip install OR closed SDK
Astrocom-Style Output	theme=astrocom — one parameter	Not available; locked chart style
Theme Presets	minimal, minimal-dark, astrocom, astrocom-dark	Fixed look or 1-2 themes
Axis Stroke Width	Float param, 1.0 to 5.0+	Hardcoded 1px
House Numbers Position	center \| near_cusp	Near cusp only
Hide Points from Aspects	hide_points_in_aspects array — post-processor	All-or-nothing; remove from chart entirely
Part of Fortune	Formula + glyph + aspect grid row	Not supported (Kerykeion); varies elsewhere
Hypothetical Planets	8 Uranian (Cupido through Poseidon) native	Rarely supported
Chart Types	Natal, Synastry, Transit, Composite — one endpoint	Often separate endpoints or libraries
Upstream Upgrade Path	Code review every bump — PATCHES.md tracked	Silent breaking changes on pip upgrade
Render Time	<500ms typical	1-3 seconds common

Related Astrology APIs

Natal API

Birth chart calculations powering the chart renderer

Part of Fortune

Hellenistic lot — formula, glyph, aspect row

Hypothetical Planets

Hamburg School / Uranian — 8 hypotheticals native

Synastry API

Relationship charts with the same theme system

Composite API

Midpoint composite charts for couples

Timing API

Age-bands and bi-wheel timing SVGs

Transit API

Live transits over a natal wheel

References & Standards

Swiss Ephemeris (DE431-based) — astronomical calculations source
NASA JPL Planetary Ephemerides — underlying ephemeris dataset
International Astronomical Union (IAU) — body designation and nomenclature standards
IANA Time Zone Database — timezone & DST resolution

Simple, Transparent Pricing

Start free, scale as you grow. No hidden fees, no surprises.

Always Free

Start Free

Perfect for learning, testing, and small personal projects

50 API calls/month

Basic natal charts

5 house systems

Community support

Pro

$11/month

For small apps and personal projects

All basic endpoints
12 house systems
Email support

Best Value

Pro Plus

$21/month

For growing apps and medium traffic

All enhanced endpoints
18 house systems
AI interpretations
Priority email support

Ultra

$37/month

For professional astrology applications

Credit math ↓

All premium endpoints
23 house systems
Advanced AI interpretations
Priority support

High Volume Plans

For enterprise-scale applications

Business

$99/month

For high-volume applications

Credit math ↓

ALL endpoints
White-label ready
Custom AI fine-tuning
Phone support

UNLIMITED

Enterprise

$399+per month

Unlimited requests with dedicated infrastructure

Dedicated server infrastructure
Sub-300ms guaranteed
24/7 dedicated support
99.99% uptime SLA

All plans include comprehensive documentation and SDKs

Questions? Talk to our team

Frequently Asked Questions about Chart Rendering API

Themes, patches, Part of Fortune, hypothetical planets, and everything in between

Related Astrology APIs

Chart Rendering API works best alongside the rest of the stack. Add

birth chart calculations Part of Fortune hypothetical planets synastry charts composite charts timing wheels live transits

Render Charts That Look Like You Made Them On Purpose

Vendored Kerykeion v4.26.3 with 10+ patch parameters, 4 theme presets, Part of Fortune, and Uranian planets. One endpoint covers natal, synastry, transit, and composite.

Start Free View Documentation

Astrocom-style preset

10+ customization params

Part of Fortune + Uranian planets

<500ms render time

Available on Ultra plan and above

Chart Rendering API: Astrocom-Grade SVG, Your Rules

Stock Astrology Charts Look Generic

Vendored Kerykeion + Our Patches = Real Control

Chart Rendering Performance

Customizable SVG, From Theme Down to Single Axis

Astrocom Theme Preset

Astrocom-Dark Theme

Minimal Theme

Minimal-Dark Theme

axis_stroke_width Parameter

axes_labels_position Parameter

house_numbers_position Parameter

Part of Fortune Glyph

hide_points_in_aspects

hide_axes_visually

Hypothetical Planets

Dual-Chart Heading

Composite Chart Type

Swiss Ephemeris Precision

23 House Systems

Custom Settings Override

What is Chart Rendering API? The Vendored-Kerykeion Story

Why did we vendor Kerykeion v4.26.3 instead of importing it?

Which theme should I pick: minimal, minimal-dark, or astrocom-dark?

What is the Astrocom preset and why does it matter?

How do per-element parameters work?

How does Part of Fortune render?

Hypothetical planets for Hamburg School and Uranian astrology

Use Cases

Traditional Astrologer Platforms

Modern Dark-Mode Apps

Hellenistic Charts with Part of Fortune

Uranian / Hamburg School

Aspect-Focused Embeds

Synastry, Transit, Composite

Technical Specifications

Vendored Kerykeion + Patches vs Stock Kerykeion vs Closed Competitors

Related Astrology APIs

Natal API

Part of Fortune

Hypothetical Planets

Synastry API

Composite API

Timing API

Transit API

References & Standards

Simple, Transparent Pricing

Always Free

Pro

Pro Plus

Ultra

High Volume Plans

Business

Enterprise

Frequently Asked Questions about Chart Rendering API

What chart themes are available?

Can I get an Astrocom-style chart?

How do I customize axis thickness?

Can I hide specific planets from aspect lines?

Does the API render Part of Fortune?

Do you support Uranian / Hamburg School planets?

Can I render synastry, transit, and composite charts?

Why did you vendor Kerykeion v4.26.3 instead of just importing it?

Where do house numbers go with house_numbers_position='center'?

What does hide_axes_visually do?

How fast does rendering take?

Which output formats do I get?

Can I override theme settings per request?

How much does Chart Rendering API cost?

What house systems are supported?

How accurate are the underlying calculations?

Are there timing wheels (age-bands, bi-wheel)?

How do I integrate this with my app?

Is there rate limiting on chart generation?

Related Astrology APIs

Render Charts That Look Like You Made Them On Purpose

Stock Astrology Charts Look Generic

Vendored Kerykeion + Our Patches = Real Control

Chart Rendering Performance

Customizable SVG, From Theme Down to Single Axis