# OnStem vs Harmonic Tuner

The clearest difference is in-app purchases: Harmonic Tuner at none against OnStem's 4. Harmonic Tuner also leads on ads (none vs shown). OnStem's advantage is iOS requirement (18.0 vs 26.2). On price, update cadence and device support there is nothing between them.

Both are free to download. OnStem sells 4 in-app purchases, starting at $0.99 per month. Harmonic Tuner asks for nothing beyond the download.

OnStem ships an update every 3 weeks, Harmonic Tuner every 2 weeks. The most recent releases landed on October 25, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | OnStem | Harmonic Tuner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/harmonic-tuner/id6759459522/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 137 MB | 6 MB |
| Requires iOS | **18.0** | 26.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [阳 刘](https://appshunter.io/developer/1616314142) | [Retro](https://appshunter.io/developer/1502159584) |

## What reviewers say

### OnStem

[App page](https://appshunter.io/ios/app/onstem-local-music-split/id6756013787)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OnStem Pro – Monthly | $0.99 | per month |
| OnStem Pro – Quarterly | $2.39 | per 3 months |
| OnStem Pro – Annual | $8.99 | per year |
| OnStem Pro – Lifetime | $9.99 | one-time |


### Harmonic Tuner

[App page](https://appshunter.io/ios/app/harmonic-tuner/id6759459522)

This app offers precision tuning for string instruments with a live readout and detailed harmonic analysis. It helps musicians check intonation, refine notes for recording, and study overtones and sustain with a focused workflow.

**Highlights:** Chromatic tuning with cents and frequency, Instrument presets, Live tuning display, Harmonic Analysis view, Harmonic strength bars, Waveform snapshots, Save and compare harmonic captures

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

**In-app purchases:** none


## Frequently asked questions

### Is OnStem free?

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

### Is Harmonic Tuner free?

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

### Do OnStem or Harmonic Tuner have ads?

OnStem shows ads; Harmonic Tuner does not.

### Which is updated more often, OnStem or Harmonic Tuner?

OnStem ships an update every 3 weeks, and Harmonic Tuner every 2 weeks. Most recently, OnStem was updated on October 25, 2026 and Harmonic Tuner on October 10, 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.*