# Astro vs Gravity by Vaonis

The clearest difference is in-app purchases: Gravity by Vaonis at none against Astro's 2. Astro's advantage is device support (3 vs 1). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Astro sells 2 in-app purchases, starting at $2.99 per month. Gravity by Vaonis asks for nothing beyond the download.

Astro ships an update every 6 weeks, Gravity by Vaonis every 2 months. Both last shipped on September 24, 2026.

## The numbers

| Metric | Astro | Gravity by Vaonis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.7 (49 ratings)](https://appshunter.io/ios/app/gravity-by-vaonis/id6469513708/reviews)** |
| Number of ratings | — | **49** |
| Positive reviews | **50.0% of reviews** | 47.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Freemium | **Free** |
| Size | 94 MB | 331 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Fabian Schussler](https://appshunter.io/developer/1568473892) | [Vaonis](https://appshunter.io/developer/1369139518) |

## What reviewers say

### Astro

[App page](https://appshunter.io/ios/app/astro-colibri/id1576668763)

This app provides real-time alerts and multi-wavelength context for astronomical events. It offers advanced planning tools, interactive sky maps, and data enrichment for professional researchers and citizen scientists.

**Highlights:** Real-time astronomical event alerts, Multi-wavelength observational context, Advanced observing condition planning, Interactive sky map visualization, Real-time photometry and lightcurve data, Pro-amateur astronomer collaboration tools

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Astro-COLIBRI AR | $2.99 | per month |
| Astro-COLIBRI AR | $29.99 | per year |


### 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 Astro free?

Astro is free to download, with in-app purchases available.

### Is Gravity by Vaonis free?

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

### Do Astro or Gravity by Vaonis have ads?

Neither Astro nor Gravity by Vaonis shows ads.

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

Astro ships an update every 6 weeks, and Gravity by Vaonis every 2 months. Most recently, Astro was updated on September 24, 2026 and Gravity by Vaonis on September 24, 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.*