# Observer Pro vs Gravity by Vaonis

The clearest difference is price: Gravity by Vaonis at Free against Observer Pro's $13.99. Gravity by Vaonis also leads on update cadence (every 2 months vs every 6 months). Observer Pro's advantage is rating (4.6 vs 2.7) and review sentiment (79% vs 48%). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Gravity by Vaonis is free to download; Observer Pro costs $13.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Observer Pro holds the better App Store score, 4.6 against 2.7. Both are backed by a comparable volume of ratings — 49 and 49 respectively. Written reviews point the same way: 79% of Observer Pro's written reviews are positive against 48% of Gravity by Vaonis's.

Observer Pro ships an update every 6 months, Gravity by Vaonis every 2 months. The most recent releases landed on September 21, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Observer Pro | Gravity by Vaonis |
| --- | --- | --- |
| Price | $13.99 | **Free** |
| Rating | **[4.6 (49 ratings)](https://appshunter.io/ios/app/observer-pro/id462392803/reviews)** | [2.7 (49 ratings)](https://appshunter.io/ios/app/gravity-by-vaonis/id6469513708/reviews) |
| Number of ratings | 49 | 49 |
| Positive reviews | **79.2% of reviews** | 47.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 241 MB | 331 MB |
| Requires iOS | 16.4 | **16.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Joshua Bury](https://appshunter.io/developer/462392806) | [Vaonis](https://appshunter.io/developer/1369139518) |

## What reviewers say

### Observer Pro

[App page](https://appshunter.io/ios/app/observer-pro/id462392803)

This app helps advanced astronomers and astrophotographers plan their observing sessions. It predicts object visibility, factoring in local obstructions, and provides weather forecasts. Manage observing lists and favorite sites to maximize your stargazing time.

**Highlights:** 14,000+ deep sky objects with photos, Local horizon profile measurement, Object visibility prediction charts, Featured object recommendations, Favorite observing site management, Astronomical weather forecasts

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🎯 Excellent target planning and visibility forecasting
- 🌍 Custom horizon mapping feature is intuitive and unique
- 📊 Comprehensive visualization graphs and charts
- 🔍 Extensive DSO catalog with detailed object information
- 📸 Offline object images included

**What reviewers complain about**

- 🐛 Crashes when selecting catalog groupings (recent)
- 🐛 Keyboard doesn't dismiss after input (iPad issue)
- 🐛 Data loss - observer lists disappearing
- 🐛 Search function missing in recent version
- ⏱️ Lack of developer updates for extended periods

**Reported bugs**

- App crashes when selecting catalog groupings (Galaxy, Planetary Nebulae, etc.)
- iOS keyboard doesn't dismiss on iPad after clicking Done
- Observer lists and custom data disappearing after app closure
- Search feature missing in version 1.4
- Continuous crashes since recent updates

**Requested features**

- iPad native app with landscape mode support
- Search functionality restoration/improvement
- Export observer lists to other apps (Sky Safari, etc.)
- Support for planets, comets, and asteroids
- Observing notes and session logging


### Gravity by Vaonis

[App page](https://appshunter.io/ios/app/gravity-by-vaonis/id6469513708)

Transform your smartphone into a smart telescope to explore the cosmos. Capture stunning images of galaxies, nebulae, and star clusters with advanced image stacking. Observe the Sun and Moon with dedicated modes and educational content.

**Highlights:** Smartphone as smart telescope, 25x optical zoom, Live image stacking, Sun and Moon observation, Deep sky object photography, Landscape and wildlife photography, Educational cosmic content

**In-app purchases:** none


## Frequently asked questions

### Is Observer Pro free?

Observer Pro costs $13.99, with no in-app purchases.

### Is Gravity by Vaonis free?

Gravity by Vaonis is free to download, with no in-app purchases.

### Which has better reviews, Observer Pro or Gravity by Vaonis?

Observer Pro is rated higher. Observer Pro averages 4.6 out of 5 from 49 ratings, while Gravity by Vaonis averages 2.7 from 49 ratings.

### Do Observer Pro or Gravity by Vaonis have ads?

Neither Observer Pro nor Gravity by Vaonis shows ads.

### Which is updated more often, Observer Pro or Gravity by Vaonis?

Observer Pro ships an update every 6 months, and Gravity by Vaonis every 2 months. Most recently, Observer Pro was updated on September 21, 2026 and Gravity by Vaonis on September 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*