# Line vs Thetis Tools

The clearest difference is update cadence: Thetis Tools at every 7 months against Line's every 41 months. On price, ads, in-app purchases and device support there is nothing between them.

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

Line ships an update every 41 months, Thetis Tools every 7 months. The most recent releases landed on October 24, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Line | Thetis Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/line-fit/id1448053643/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 7 months** |
| Monetization | Free | — |
| Size | 1 MB | 50 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Bjarne Berge](https://appshunter.io/developer/1209858941) | [Thetis srl](https://appshunter.io/developer/397584184) |

## What reviewers say

### Line

[App page](https://appshunter.io/ios/app/line-fit/id1448053643)

This app models the relationship between two variables using linear regression. It fits a linear equation to observed data, calculating the slope, intercept, correlation coefficient, and coefficient of determination to assess the model's fit.

**Highlights:** Linear regression modeling, Calculate slope and intercept, Correlation coefficient calculation, Coefficient of determination (R2), Model fit assessment

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

**In-app purchases:** none


### Thetis Tools

[App page](https://appshunter.io/ios/app/thetis-tools/id1460268980)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Line free?

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

### Is Thetis Tools free?

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

### Do Line or Thetis Tools have ads?

Neither Line nor Thetis Tools shows ads.

### Which is updated more often, Line or Thetis Tools?

Line ships an update every 41 months, and Thetis Tools every 7 months. Most recently, Line was updated on October 24, 2026 and Thetis Tools on October 26, 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.*