# KeckWatch vs Stars Units Sizes Objects

The clearest difference is ads: KeckWatch at none against Stars Units Sizes Objects's shown. KeckWatch also leads on update cadence (every 5 weeks vs every 4 months) and monetization model (free vs ad-supported). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.3 for KeckWatch against 4.3 for Stars Units Sizes Objects. Both are backed by a comparable volume of ratings — 9 and 6 respectively. Written reviews are what separate them: 83% of KeckWatch's written reviews are positive against 80% of Stars Units Sizes Objects's.

KeckWatch ships an update every 5 weeks, Stars Units Sizes Objects every 4 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | KeckWatch | Stars Units Sizes Objects |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (9 ratings)](https://appshunter.io/ios/app/keckwatch/id953228443/reviews) | [4.3 (6 ratings)](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571/reviews) |
| Number of ratings | **9** | 6 |
| Positive reviews | **83.3% of reviews** | 80.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 5 weeks** | Every 4 months |
| Monetization | **Free** | Ad-supported |
| Size | 147 MB | 124 MB |
| Requires iOS | **7.1** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mike Smithwick](https://appshunter.io/developer/294198918) | [Mudarmeen Munlin](https://appshunter.io/developer/1348165664) |

## What reviewers say

### KeckWatch

[App page](https://appshunter.io/ios/app/keckwatch/id953228443)

Explore the cosmos with detailed information on stars, planets, galaxies, and nebulae. Discover celestial objects using your device's compass and GPS, and stay updated with news from the W. M. Keck Observatory. Features a night-vision-friendly red interface and offline access.

**Highlights:** Offline celestial exploration, Real-time telescope status, Compass and GPS integration, Detailed object information, Hawaiian star names, Night vision red interface, Keck Observatory news

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

**In-app purchases:** none


### Stars Units Sizes Objects

[App page](https://appshunter.io/ios/app/stars-units-sizes-objects/id1576148571)

Explore the vastness of the universe, from the smallest particles to the largest cosmic structures. Compare object sizes, view detailed images, and perform unit conversions across a wide range of astronomical scales. Learn about stars, galaxies, and the incredible distances between them.

**Highlights:** Compare object sizes, View object images, Pinch/Zoom and Pan images, Unit conversion for distances, Explore scales from Planck length to observable universe, Learn about stars and galaxies

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is KeckWatch free?

KeckWatch is free to download, with no in-app purchases.

### Is Stars Units Sizes Objects free?

Stars Units Sizes Objects is free to download, with no in-app purchases.

### Which has better reviews, KeckWatch or Stars Units Sizes Objects?

KeckWatch and Stars Units Sizes Objects are both rated 4.3 out of 5 on the App Store, from 9 and 6 ratings respectively.

### Do KeckWatch or Stars Units Sizes Objects have ads?

Stars Units Sizes Objects shows ads; KeckWatch does not.

### Which is updated more often, KeckWatch or Stars Units Sizes Objects?

KeckWatch ships an update every 5 weeks, and Stars Units Sizes Objects every 4 months. Most recently, KeckWatch was updated on October 24, 2026 and Stars Units Sizes Objects on October 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.*