Learning and careers decision
Stellara
A competent developer can reproduce the core natal-chart + AI-report flow in about a week and maintain it cheaply; Stellara's durable advantage is modest brand/reviews rather than technical moat, so building is realistic for one user.
Visit website↗Built by GHOST, who ships 5 products in this index
Not priced
No pricing page we fetched carried a figure, so there is nothing to compare against. The build side is still real.
$50one-off30 h to build
$30/mo3 h/mo upkeep
No published price to break even against.
No open-source build does this yet
Nothing published replaces this one, so a replacement starts from an empty file. Here is what it would have to cover.
What a replacement has to do
- Collect birth data → compute planetary positions and houses → format structured prompt → call GPT-4o (or substitute) → render report (HTML/PDF) and deliver to user
What it still won’t have
- Brand recognition and existing user base (+12,000 themes and ratings)
- Polished prompt engineering and tuned copywriting for astrology
- Proprietary UX polish, design and PDF layout
- Built-in premium features like scheduled transits/alerts and multi-day trends
- Trust signals and reviews (4.9/5) that drive conversions
What remains hard
- Brand trust
4.9/5 - +12 000 thèmes
- Brand trust
Stellara astro-experte
First-year cost
No published price
Stellara does not publish a price we could read, so there is nothing to compare against. What building costs is below.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a one-user natal-chart web service using Node.js (Express) + Next.js for frontend, PostgreSQL for minimal storage, and an ephemeris library (e.g., an npm swisseph binding or astronomia) to compute planet positions, houses and aspects. Core features in scope: (1) secure form for birth data with geocoding to lat/long, (2) deterministic ephemeris computation and aspects table, (3) prompt templating and integration with an LLM API (configurable endpoint) to generate a textual report, (4) HTML report viewer and PDF generation, (5) single-payment checkout for PDF and a simple subscription flag for premium alerts, (6) user data deletion endpoint and HTTPS. Out of scope: multi-tenant admin panel, advanced marketing site, analytics beyond basic logs, mobile app. Include error handling for bad inputs and API failures, automated tests for ephemeris calculations and prompt/response plumbing, and CI to run tests and deploy to a small VPS or managed host.
How we checked
How the score was reached
- Build verdict base78
- 3 cited sources+3
- Evidence score81
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time - so the same evidence always produces the same number.
How scoring works →Cited sources · 3
Every page the run actually retrieved.
- official productStellara — Thème Natal Personnalisé | Gratuit
- official productStellara — How analysis is produced
- official productStellara — Pricing and tiers (page content)
Integrity checks
What held up, and what did not.