Comparison · Updated July 2026

Astrologer vs Co-Star

Co-Star is the app that made astrology cool on iOS — minimalist design, blunt push notifications, and friend compatibility. Astrologer is a full chart workspace: the same accessibility, but with an actual readable chart, real synastry, timing tools, and interpretation underneath. The honest difference is depth.

Open Astrologer free

Co-Star at a glance

A design-led daily-horoscope and friend-compatibility app for casual users.

Maker	Co-Star Astrology Society (New York, founded 2017, venture-backed)
Platforms	iOS and Android. Mobile-first; no professional desktop tooling.
Pricing	Free core. Co-Star says its revenue comes from à-la-carte in-app purchases; advanced readings are currently listed at $9 each. Eros is an optional relationship subscription priced in the app.
Calculation engine	A proprietary system based on natal charts and current transits; the calculation engine is not publicly documented.
Best for	Casual, mobile-first users who want a daily nudge and to compare charts with friends.

Feature comparison

Feature	Astrologer	Co-Star
Daily horoscope + push notifications	Yes (transit-based)	Yes — its signature feature
Friend / social compatibility	Synastry + composite charts	Yes — strong social layer
Full interactive chart wheel + aspect grid	Yes	Limited
Real synastry biwheel	Yes	No
Timing tools (transits, profections, returns)	Yes	No
Astrocartography	Yes	No
On-demand readings grounded in your placements	Yes (paid plans)	Yes — à la carte
Calculation engine	Swiss Ephemeris	Not publicly documented
Price	Free tools / $26 Practitioner	Free core / $9 readings + IAPs

Where Co-Star wins

Best-in-class minimalist design and a memorable, blunt writing voice.
The friend-feed and social compatibility loop is genuinely fun and viral.
A polished, native mobile experience with a huge community.

Where Astrologer wins

A real, interactive chart wheel with aspects, houses, and dignities — not just a sign list.
Actual synastry and composite charts instead of a compatibility percentage.
Timing tools (transits, annual profections, solar/lunar returns) Co-Star simply does not have.
Astrocartography, asteroids, declinations, and fixed stars for serious study.
AI readings grounded in your exact placements rather than pre-written snippets.

The bottom line

If you want a daily vibe and to compare charts with friends, Co-Star is delightful. If you want to actually read a chart — yours or a client’s — and learn astrology, Astrologer goes far deeper while staying just as easy to open.

Try Astrologer free

Frequently asked questions

Is Astrologer free like Co-Star?

Astrologer offers free public chart tools and 44 calculators. The $26/mo Practitioner plan adds the full chart studio, Academy, unlimited clients and charts, and 150 AI readings per month.

Does Astrologer have a daily horoscope like Co-Star?

Yes — Astrologer surfaces your current transits, but it also lets you open the chart those transits are hitting, which Co-Star does not.

Which is more accurate, Co-Star or Astrologer?

Both use real astronomical data. Astrologer uses the Swiss Ephemeris, the same engine professional desktop software relies on, and exposes the full chart so you can verify every placement.