# UniTuner vs Klaus

The clearest difference is in-app purchases: Klaus at none against UniTuner's 5. Klaus also leads on iOS requirement (12.0 vs 15.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. UniTuner sells 5 one-off in-app purchases. Klaus asks for nothing beyond the download.

UniTuner ships an update every 2 months, Klaus monthly. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | UniTuner | Klaus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (141 ratings)](https://appshunter.io/ios/app/unituner-chromatic-tuner/id1546441866/reviews)** | — |
| Number of ratings | **141** | — |
| Positive reviews | 93.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 32 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Klaus Fecker](https://appshunter.io/developer/1455227164) | [Markus Stradner](https://appshunter.io/developer/1884693633) |

## What reviewers say

### UniTuner

[App page](https://appshunter.io/ios/app/unituner-chromatic-tuner/id1546441866)

This app provides precise chromatic tuning for a wide range of instruments. It offers advanced features like capo simulation, audio visualization, and a tone generator for accurate tuning and sound analysis. Explore over 200 tunings and customize your own for a personalized experience.

**Highlights:** Capo Simulation, Accurate Cent Readout, Tone Generator, Audio Visualization (Spectrum), Tuning Map, Over 200 Tunings, Customizable Concert Pitch

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Silver Supporter | $1.99 | one-time |
| Gold Supporter | $3.99 | one-time |
| Purple Supporter | $5.99 | one-time |
| Emerald Supporter | $7.99 | one-time |
| Sapphire Supporter | $24.99 | one-time |


### Klaus

[App page](https://appshunter.io/ios/app/klaus-die-hackbrett-maus/id6760487536)

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

**In-app purchases:** none


## Frequently asked questions

### Is UniTuner free?

UniTuner is free to download, with in-app purchases available.

### Is Klaus free?

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

### Do UniTuner or Klaus have ads?

Neither UniTuner nor Klaus shows ads.

### Which is updated more often, UniTuner or Klaus?

UniTuner ships an update every 2 months, and Klaus monthly. Most recently, UniTuner was updated on November 3, 2026 and Klaus on October 25, 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.*