# Hubble Space Telescope Tracker vs Stargraph Pro

The clearest difference is in-app purchases: Stargraph Pro at none against Hubble Space Telescope Tracker's 1. Stargraph Pro also leads on ads (none vs shown) and update cadence (every 2 weeks vs every 3 months). Hubble Space Telescope Tracker's advantage is iOS requirement (12.0 vs 15.6). On price and device support there is nothing between them.

Both are free to download. Hubble Space Telescope Tracker sells 1 one-off in-app purchase. Stargraph Pro asks for nothing beyond the download.

Hubble Space Telescope Tracker ships an update every 3 months, Stargraph Pro every 2 weeks. The most recent releases landed on October 12, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Hubble Space Telescope Tracker | Stargraph Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/hubble-space-telescope-tracker/id6468819172/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 72 MB | 43 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KAKHA GIORGASHVILI](https://appshunter.io/developer/1501353984) | [Josh Cole](https://appshunter.io/developer/1843250866) |

## What reviewers say

### Hubble Space Telescope Tracker

[App page](https://appshunter.io/ios/app/hubble-space-telescope-tracker/id6468819172)

Follow NASA's Hubble Space Telescope mission in real time. Explore a gallery of stunning images, engage in discussions, and learn about space. Receive notifications for new discoveries and test your knowledge with quizzes.

**Highlights:** Real-time mission progress, Image gallery, Discussion forums, Notifications for new images, 3D Solar system model, Ask an Astronomer feature

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $2.99 | one-time |


### Stargraph Pro

[App page](https://appshunter.io/ios/app/stargraph-pro/id6753266292)

**Features:** iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is Hubble Space Telescope Tracker free?

Hubble Space Telescope Tracker is free to download, with in-app purchases available.

### Is Stargraph Pro free?

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

### Do Hubble Space Telescope Tracker or Stargraph Pro have ads?

Hubble Space Telescope Tracker shows ads; Stargraph Pro does not.

### Which is updated more often, Hubble Space Telescope Tracker or Stargraph Pro?

Hubble Space Telescope Tracker ships an update every 3 months, and Stargraph Pro every 2 weeks. Most recently, Hubble Space Telescope Tracker was updated on October 12, 2026 and Stargraph Pro on October 28, 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.*