# iontuner vs OpenString

The clearest difference is in-app purchases: iontuner at none against OpenString's 1. OpenString's advantage is update cadence (daily vs every 3 weeks) and iOS requirement (15.1 vs 17.6). On price, ads and device support there is nothing between them.

Both are free to download. OpenString sells 1 one-off in-app purchase. iontuner asks for nothing beyond the download.

iontuner ships an update every 3 weeks, OpenString daily. The most recent releases landed on October 2, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | iontuner | OpenString |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/openstring-tuner-and-chords/id6811273833/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Monetization | — | Free |
| Size | 2 MB | 47 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Seth Adam Mundall](https://appshunter.io/developer/1626079549) | [Techguyver Labs, LLC](https://appshunter.io/developer/6796192098) |

## What reviewers say

### iontuner

[App page](https://appshunter.io/ios/app/iontuner/id6767259524)

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

**In-app purchases:** none


### OpenString

[App page](https://appshunter.io/ios/app/openstring-tuner-and-chords/id6811273833)

This app provides essential tools for guitarists, including a tuner, metronome, chord handbook, and a personal songbook. It offers all features upfront with no subscriptions or in-app purchases, allowing users to manage their own song charts and practice effectively offline.

**Highlights:** Guitar tuner, Metronome with tempo and meter settings, Chord handbook with fingerings and voicings, Personal songbook for lyrics and chords, Key transposition and capo preference, Scale and shape finder

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OpenString Pro | $9.99 | one-time |


## Frequently asked questions

### Is iontuner free?

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

### Is OpenString free?

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

### Do iontuner or OpenString have ads?

Neither iontuner nor OpenString shows ads.

### Which is updated more often, iontuner or OpenString?

iontuner ships an update every 3 weeks, and OpenString daily. Most recently, iontuner was updated on October 2, 2026 and OpenString on October 8, 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.*