# Observer Pro vs Flex Performing Arts

The clearest difference is price: Flex Performing Arts at Free against Observer Pro's $13.99. Flex Performing Arts also leads on update cadence (every 5 weeks vs every 6 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Flex Performing Arts 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 ships an update every 6 months, Flex Performing Arts every 5 weeks. The most recent releases landed on October 8, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Observer Pro | Flex Performing Arts |
| --- | --- | --- |
| Price | $13.99 | **Free** |
| Rating | **[4.6 (49 ratings)](https://appshunter.io/ios/app/observer-pro/id462392803/reviews)** | — |
| Number of ratings | **49** | — |
| Positive reviews | 79.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 weeks** |
| Monetization | Paid | — |
| Size | 241 MB | 72 MB |
| Requires iOS | 16.4 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Joshua Bury](https://appshunter.io/developer/462392806) | [Flex Performing Arts](https://appshunter.io/developer/1647400061) |

## 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


### Flex Performing Arts

[App page](https://appshunter.io/ios/app/flex-performing-arts/id6443587250)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Observer Pro free?

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

### Is Flex Performing Arts free?

Flex Performing Arts is free to download, with no in-app purchases.

### Do Observer Pro or Flex Performing Arts have ads?

Neither Observer Pro nor Flex Performing Arts shows ads.

### Which is updated more often, Observer Pro or Flex Performing Arts?

Observer Pro ships an update every 6 months, and Flex Performing Arts every 5 weeks. Most recently, Observer Pro was updated on October 8, 2026 and Flex Performing Arts on October 2, 2026.

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