# sqrt vs Lines

The clearest difference is price: sqrt at Free against Lines's $19.99. sqrt also leads on update cadence (every 5 weeks vs every 13 months) and iOS requirement (8.4 vs 12.0). Lines's advantage is rating (5.0 vs 3.3) and review sentiment (100% vs 58%). On ratings volume, ads, in-app purchases and device support there is nothing between them.

sqrt is free to download; Lines costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Lines holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 7 and 11 respectively. Written reviews point the same way: 58% of sqrt's written reviews are positive against 100% of Lines's.

sqrt ships an update every 5 weeks, Lines every 13 months. The most recent releases landed on September 11, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | sqrt | Lines |
| --- | --- | --- |
| Price | **Free** | $19.99 |
| Rating | [3.3 (7 ratings)](https://appshunter.io/ios/app/sqrt-audio/id633454463/reviews) | **[5.0 (11 ratings)](https://appshunter.io/ios/app/lines-feedback-multieffect/id6461267498/reviews)** |
| Number of ratings | 7 | **11** |
| Positive reviews | 57.9% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 13 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 14 MB | 29 MB |
| Requires iOS | **8.4** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TeaTracks](https://appshunter.io/developer/347383592) | [AudioThing Ltd.](https://appshunter.io/developer/1659941236) |

## What reviewers say

### sqrt

[App page](https://appshunter.io/ios/app/sqrt-audio/id633454463)

This app allows users to trigger and manipulate sounds on a multitouch surface. The pro version enables loading custom audio files and creating personalized sound grids. It offers a unique playback control system where sound parameters are interpolated across the screen.

**Highlights:** Multitouch sound triggering, Drag-to-manipulate sound parameters, Load custom sounds (Pro version), Create custom sound grids (Pro version), Interpolate between parameter presets, Includes curated glitch sounds

**Features:** macOS Compatibility

**In-app purchases:** none


### Lines

[App page](https://appshunter.io/ios/app/lines-feedback-multieffect/id6461267498)

This audio effect plugin transforms any signal into a wide spectrum of sounds, from lo-fi to distortion and feedback. It can also function as an experimental synthesizer, creating rhythms and soundscapes even without input.

**Highlights:** Creative signal mangling, Experimental synthesizer, Feedback-based sound design, Wide range of audio effects, Rhythm and soundscape generation

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is sqrt free?

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

### Is Lines free?

Lines costs $19.99, with no in-app purchases.

### Which has better reviews, sqrt or Lines?

Lines is rated higher. sqrt averages 3.3 out of 5 from 7 ratings, while Lines averages 5.0 from 11 ratings.

### Do sqrt or Lines have ads?

Neither sqrt nor Lines shows ads.

### Which is updated more often, sqrt or Lines?

sqrt ships an update every 5 weeks, and Lines every 13 months. Most recently, sqrt was updated on September 11, 2026 and Lines on September 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.*