Astrosimo vs GREYN
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Astrosimo
Plan, align, and capture stunning night sky photos with recommended settings and automatic processing. Explore celestial objects and enhance your astrophotography with advanced features.
- Night sky planning and alignment
- Recommended capture settings
- Automatic star focus
- Live view target alignment
- Automatic stacking and processing
- Celestial object catalog
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Astrosimo helps you plan, align, and capture the night sky on iPhone. Choose the Moon, star fields, clusters, nebulae, or galaxies. Capture prepares recommended settings and displays live target alignment over the viewfinder. The catalog includes Messier objects, showpiece deep-sky targets, the Moon, and planets. Planet guidance is for locating and composition; detailed planet images require added optics. Tonight ranks phone-suitable targets using the selected night, location, weather, and moonlight. It does not recommend planets for automatic phone capture. Free includes three successful automatic captures total, recommended settings, automatic star focus, target alignment, automatic stacking with a live view, automatic gradient removal and stretch, and photos saved to Photos at up to 2200 px on the long side. Trails and Time-lapse sessions run for 5 or 10 minutes. Tonight, the Library, capture settings and an exposure histogram on every photo are included. Pro includes unlimited astrophotography and keeps capture automatic, with linear RAW stacking on supported cameras and output up to 4096 px on the long side. Manual controls are optional. Pro also adds exposure, ISO, focus with a loupe, white balance, frame count and stacking choices, optional dark frames, adjustable finishing, 16-bit TIFF export, Trails and Time-lapse sessions up to 30 minutes, and photo verification. Annual and monthly plans unlock the same features. No trial or introductory offer. Free captures use a dedicated private iCloud allowance, independent of Library or Photos deletion. Precise location is used only for live planning and alignment. Saved records use approximate location. All image processing happens on the iPhone. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
GREYN
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Free for seven days, everything unlocked, nothing watermarked. After that, one payment unlocks saving and sharing for good. No subscription, nothing that renews, no ads. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is iOS requirement: GREYN at 16.4 against Astrosimo's 27.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Astrosimo sells 2 in-app purchases, starting at $9.99 per month and GREYN sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Astrosimo ships an update every 3 days, GREYN every 2 days. The most recent releases landed on October 14, 2026 and October 1, 2026 respectively.
| Parameter | Astrosimo | GREYN |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 days | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone | iPhone |
| Requires iOS | 27.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 26 MB | 48 MB |
| Age rating | 4+ | 4+ |
| Developer | Joseph Simo | TANKUTAY DOGU OKSUZ |
In-app purchases
Astrosimo
- Astrosimo Pro Monthly$9.991 Month
- Astrosimo Pro Annual$49.991 Year
GREYN
- 7-day TrialFree
- Full Version$5.99
