# Satellite Tracker by Star Walk vs Modern GB Stamp Decoder

The clearest difference is ads: Modern GB Stamp Decoder at none against Satellite Tracker by Star Walk's shown. Modern GB Stamp Decoder also leads on update cadence (every 9 days vs every 2 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Satellite Tracker by Star Walk sells 10 in-app purchases, starting at $0.49 per month and Modern GB Stamp Decoder sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Satellite Tracker by Star Walk ships an update every 2 months, Modern GB Stamp Decoder every 9 days. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Satellite Tracker by Star Walk | Modern GB Stamp Decoder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (70K ratings)](https://appshunter.io/ios/app/satellite-tracker-by-star-walk/id1248172706/reviews)** | — |
| Number of ratings | **70K** | — |
| Positive reviews | 57.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 331 MB | 96 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vito Technology Inc.](https://appshunter.io/developer/289641503) | [Modern GB](https://appshunter.io/developer/1856873692) |

## What reviewers say

### Satellite Tracker by Star Walk

[App page](https://appshunter.io/ios/app/satellite-tracker-by-star-walk/id1248172706)

Track satellites in real-time, including the ISS and Starlink. Get predictions for upcoming passes and set alerts. Explore satellite orbits and trajectories with various viewing modes.

**Highlights:** Real-time satellite tracking, Satellite flyby timer, Pass predictions, Customizable location, Fly-with-satellite view, Satellite orbit over Earth

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Real Time Satellite Tracking | $0.49 | per month |
| Satellite Tracker Premium: 1m | $0.99 | per month |
| Real Time Satellite Tracking | $0.99 | per 3 months |
| Satellite Tracker Premium: 1m | $1.99 | per month |
| Satellite Tracker Premium: 1m | $1.99 | per month |
| Satellite Tracker Premium: 1y | $5.99 | per year |
| Satellite Tracker Premium: 1y | $7.99 | per year |
| Satellite Tracker Premium: 1y | $7.99 | per year |
| Lifetime Premium Access Sale | $4.99 | one-time |
| Lifetime Premium Access | $9.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 🔭 Excellent for tracking ISS
- 🌍 Impressive 3D graphics
- 👍 Helpful for stargazing with kids
- 🔍 Useful for identifying satellites

**What reviewers complain about**

- 💰 Subscription model too restrictive
- 🔍 Limited satellite tracking options
- 🕰️ Inaccurate pass timing notifications
- 🔌 Requires internet connection
- 🔍 Difficult to find and track specific satellites

**Reported bugs**

- Unsubscribe button not working
- Compass issues causing incorrect orientation
- Occasional crashes and freezes

**Requested features**

- Add more satellite tracking options
- Improve pass timing accuracy
- Provide offline mode for remote use
- Allow tracking of HAM radio satellites
- Add more detailed satellite information


### Modern GB Stamp Decoder

[App page](https://appshunter.io/ios/app/modern-gb-stamp-decoder/id6755879525)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Core Monthly | $0.99 | per month |
| Pro Core Annual | $9.99 | per year |


## Frequently asked questions

### Is Satellite Tracker by Star Walk free?

Satellite Tracker by Star Walk is free to download, with in-app purchases available.

### Is Modern GB Stamp Decoder free?

Modern GB Stamp Decoder is free to download, with in-app purchases available.

### Do Satellite Tracker by Star Walk or Modern GB Stamp Decoder have ads?

Satellite Tracker by Star Walk shows ads; Modern GB Stamp Decoder does not.

### Which is updated more often, Satellite Tracker by Star Walk or Modern GB Stamp Decoder?

Satellite Tracker by Star Walk ships an update every 2 months, and Modern GB Stamp Decoder every 9 days. Most recently, Satellite Tracker by Star Walk was updated on November 8, 2026 and Modern GB Stamp Decoder on October 30, 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.*