You already read a tropical chart. Stars computes the rest from the same birth data — Vedic nakshatras and dashas, Hellenistic time-lords, the BaZi Four Pillars, Zi Wei Dou Shu — and shows you where the traditions converge, where they diverge, and where each one carries a citation you can check.
Every chart is read across 169 systems. A convergence score doesn't measure "how much" of a trait a chart carries — it measures how many independent traditions land on the same conclusion. 93 traditional D0–D2 systems converge at cosine 0.515–0.523 across 500 charts (511 comparable pairs), engine hypotheses excluded.
Illustrative layout. Convergence is computed over a 500-chart validation set, engine hypotheses excluded.
And the one-page session brief that drops out of it:
the whole engine, behind every category
93 traditional D0–D2 systems converge at cosine 0.515–0.523 across 500 charts (511 comparable pairs), engine hypotheses excluded. Engine 2.7.0. Verified 2026-09-08.
Tropical natal with dignities, sect, and bounds; secondary progressions, solar arc, solar and lunar returns, transits, and Hellenistic zodiacal releasing from Spirit.
Sidereal chart, nakshatras, Vimshottari dasha, divisional charts (vargas), Shadbala, Jaimini chara karakas, Ashtakavarga, Panchanga.
BaZi Four Pillars with luck pillars, Zi Wei Dou Shu (Purple Star) with its 12 palaces and star placements, the Chinese zodiac, and the 28 Xiu lunar mansions — computed from the same instant, not a year lookup.
Planetary hours and days, Vedic muhurta, void-of-course windows, dignity and fixed-star conditions — search forward for a workable date, or score one you already have.
Essential dignities, Egyptian and Ptolemaic terms, Arabian lots, firdaria, annual profections, planetary conditions — the pre-modern toolkit, sourced to Ptolemy, Valens, and Lilly.
Cosmobiology midpoints and the 90° dial, Uranian transneptunians, asteroids and centaurs, fixed stars and parans, harmonics, astrocartography.
A one-page prep sheet for any chart in seconds — current timing, progressed highlights, and the sharpest cross-tradition patterns. Batch the day's briefs into one ZIP.
An honest comparison against the tools working astrologers use today. Stars is a web app with an API — no install, no platform lock-in, no license files.
| Feature | Stars Engine | Solar Fire | Astro Gold | Parashara's Light |
|---|---|---|---|---|
| Western tropical | ✅ Full + 100+ derived systems | ✅ | ✅ | ❌ |
| Vedic / sidereal | ✅ Nakshatras, dasha, shadbala, navamsa | ❌ | ❌ | ✅ |
| Chinese pillar systems | ✅ BaZi, Zi Wei Dou Shu, 28 Xiu | ❌ | ❌ | ❌ |
| Cross-tradition convergence | ✅ 93-system scoring | ❌ | ❌ | ❌ |
| Source-cited output | ✅ Cited, or marked unwarranted | ❌ | ❌ | ❌ |
| API access | ✅ REST + MCP | ❌ | ❌ | ❌ |
| Web-based (no install) | ✅ Any browser | ❌ Windows only | ❌ Mac/iOS only | ❌ Windows only |
| Price | $0–199/mo | $399 once | $199 once | $299 once |
Explorer $0/mo · Enthusiast $12/mo · Practitioner $59/mo · Studio $199/mo. A practitioner billing $150/session who saves 20 minutes of prep per session recovers the subscription in the first week. Against the ~$1,000/yr fragmentation tax (Solar Fire + Parashara's Light + Maia Mechanics + PDF licenses), $708/yr replaces the entire stack.
Stars computes positions and derives systems. The reading belongs to you — in your tradition, with your training. We cite your authorities, not ours: Parashara for Vedic, Ptolemy and Valens for Hellenistic, the classical almanacs for BaZi.
Invite-only beta. Founding practitioners get a permanent free account for a working assessment of what's useful, what's noise, and what's missing.