# SkySafari 7 Pro vs Thread Length Calculator

The clearest difference is review sentiment: Thread Length Calculator at 100% against SkySafari 7 Pro's 46%. Thread Length Calculator also leads on price (Free vs $17.99) and in-app purchases (none vs 5). SkySafari 7 Pro's advantage is ratings volume (5.5K vs 3). On ads, device support and iOS requirement there is nothing between them.

Thread Length Calculator is free to download; SkySafari 7 Pro costs $17.99 up front. SkySafari 7 Pro sells 5 in-app purchases, starting at $4.99 per month. Thread Length Calculator asks for nothing beyond the download.

Thread Length Calculator holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: SkySafari 7 Pro has 5.5K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 46% of SkySafari 7 Pro's written reviews are positive against 100% of Thread Length Calculator's.

SkySafari 7 Pro ships an update every 5 weeks, Thread Length Calculator every 10 days. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | SkySafari 7 Pro | Thread Length Calculator |
| --- | --- | --- |
| Price | $17.99 | **Free** |
| Rating | [4.6 (5.5K ratings)](https://appshunter.io/ios/app/skysafari-7-pro/id1567658979/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/thread-length-calculator/id6458585044/reviews)** |
| Number of ratings | **5.5K** | 3 |
| Positive reviews | 45.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 10 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 2.4 GB | 11 MB |
| Requires iOS | 14.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Simulation Curriculum Corp.](https://appshunter.io/developer/791341744) | [Nigel Armitage](https://appshunter.io/developer/1834117685) |

## What reviewers say

### SkySafari 7 Pro

[App page](https://appshunter.io/ios/app/skysafari-7-pro/id1567658979)

Explore the night sky with an extensive astronomy database and advanced planning tools. Discover astronomical events, control your telescope, and connect with other stargazers in real-time.

**Highlights:** Extensive celestial object database, Advanced event finder, Telescope control (ASCOM Alpaca, INDI, StarSense), Real-time social stargazing (OneSky), Guided sky tours (SkyCast), Observation planning and logging, Home and lock screen widgets

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SkySafari Premium Monthly | $4.99 | per month |
| SkySafari Premium | $39.99 | per year |
| PGC Galaxy Database | Free | one-time |
| GAIA Star Database | Free | one-time |
| Apollo Lunar Missions | Free | one-time |

**What reviewers like**

- 🚀 Excellent observational tool
- 🌟 Powerful and indispensable app
- 👍 Great app, easy to use
- 🔭 Wonderful planetarium app
- 💻 Best mobile tool for telescope control

**What reviewers complain about**

- 🐛 App crashes upon opening
- 🌍 Lack of Southern Hemisphere support
- 🔍 Complicated interface, not user-friendly
- 🔌 Crashes too often
- 💰 Pay even more for additional features

**Reported bugs**

- Free database downloads fail to complete
- Telescope button crashes the app
- Time settings spontaneously reset
- Observing list crashes the app
- Field of view indicators not working

**Requested features**

- Add ability to quickly edit light form
- Allow custom horizon mask input
- Include surface brightness data for extended objects
- Add transit altitude information for objects
- Improve object search with fuzzy matching


### Thread Length Calculator

[App page](https://appshunter.io/ios/app/thread-length-calculator/id6458585044)

This free tool helps leatherworkers accurately calculate the thread length required for their projects. It accounts for the number of holes, stitching length, and leather thickness, ensuring you always have enough material.

**Highlights:** Thread length calculation, Supports any number of holes, Accounts for stitching length, Considers leather thickness, Free to use

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

**In-app purchases:** none


## Frequently asked questions

### Is SkySafari 7 Pro free?

SkySafari 7 Pro costs $17.99, and also offers in-app purchases.

### Is Thread Length Calculator free?

Thread Length Calculator is free to download, with no in-app purchases.

### Which has better reviews, SkySafari 7 Pro or Thread Length Calculator?

Thread Length Calculator is rated higher. SkySafari 7 Pro averages 4.6 out of 5 from 5.5K ratings, while Thread Length Calculator averages 5.0 from 3 ratings.

### Do SkySafari 7 Pro or Thread Length Calculator have ads?

Neither SkySafari 7 Pro nor Thread Length Calculator shows ads.

### Which is updated more often, SkySafari 7 Pro or Thread Length Calculator?

SkySafari 7 Pro ships an update every 5 weeks, and Thread Length Calculator every 10 days. Most recently, SkySafari 7 Pro was updated on November 7, 2026 and Thread Length Calculator on November 3, 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.*