# tonestro vs Cello Key

The clearest difference is review sentiment: tonestro at 59% against Cello Key's 0%. tonestro also leads on rating (4.4 vs 3.5) and update cadence (weekly vs every 6 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. tonestro sells 21 in-app purchases, starting at $16.49 per month and Cello Key sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

tonestro holds the better App Store score, 4.4 against 3.5. That said, the two scores are not equally well evidenced: tonestro has 2.4K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 59% of tonestro's written reviews are positive against 0% of Cello Key's.

tonestro ships an update weekly, Cello Key every 6 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | tonestro | Cello Key |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (2.4K ratings)](https://appshunter.io/ios/app/tonestro-music-lessons/id1365630760/reviews)** | [3.5 (2 ratings)](https://appshunter.io/ios/app/cello-key/id6449323913/reviews) |
| Number of ratings | **2.4K** | 2 |
| Positive reviews | **58.8% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Weekly** | Every 6 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 232 MB | 61 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [fun.music IT GmbH](https://appshunter.io/developer/1365630759) | [Yuriko Kimura](https://appshunter.io/developer/1437608412) |

## What reviewers say

### tonestro

[App page](https://appshunter.io/ios/app/tonestro-music-lessons/id1365630760)

Learn to play a musical instrument with interactive lessons, fingering charts, and sheet music. Get real-time feedback on your performance and track your progress with engaging exercises and challenges. Practice your favorite songs with studio-quality accompaniment.

**Highlights:** Interactive lessons, Fingering charts, Sheet music library, Real-time feedback, Progress tracking, Weekly challenges

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

**In-app purchases (21)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Learn an instrument, 1 month | $16.49 | per month |
| 1 Month Premium | $17.49 | per month |
| tonestro Premium | $29.99 | per month |
| tonestro Premium | $29.99 | per month |
| tonestro Premium | $39.99 | per month |
| tonestro Premium | $44.49 | per month |
| Special wind instrument offer | $59.99 | per year |
| Welcome offer | $64.99 | per year |
| tonestro Premium | $99.99 | per year |
| tonestro Premium | $99.99 | per year |
| tonestro Premium | $99.99 | per year |
| Learn to Play Wind Instruments | $103.99 | per year |
| tonestro Premium | $109.99 | per year |
| One-Time Special Offer | $109.99 | per year |
| Learn to Play Wind Instruments | $111.99 | per year |
| tonestro Premium | $149.99 | per year |
| tonestro Premium | $149.99 | per year |
| tonestro Premium | $149.99 | per year |
| tonestro Premium | $197.99 | per year |
| tonestro Premium | $197.99 | per year |
| tonestro Premium | $224.99 | per year |

**What reviewers like**

- 👍 Fun and helpful for learning
- 🚀 Effective teaching methods
- 💡 Good for beginners and intermediate players
- 🎉 Motivating and engaging

**What reviewers complain about**

- 💰 Expensive subscription
- 🔒 Too many features locked behind paywall
- 🐛 Issues with note recognition and feedback
- 📚 Lack of free learning content

**Reported bugs**

- App freezing or crashing
- Subscription issues and lack of customer support
- Inaccurate tuning and note detection

**Requested features**

- More free lessons and songs
- Better note recognition and feedback
- Ability to learn multiple instruments
- Offline mode for practicing
- Family/group subscription options


### Cello Key

[App page](https://appshunter.io/ios/app/cello-key/id6449323913)

This app provides a simple fingerboard chart for cello learners, helping them identify notes, positions, and fingerings. It's designed for easy reference anywhere, especially useful for sheet music without finger numbers. It's particularly recommended for adult beginners.

**Highlights:** Fingerboard chart for cello, Note identification, Position guidance, Finger number reference, Simple and easy to read layout, Portable reference tool

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Natural Minor Scales Pack | $1.99 | one-time |


## Frequently asked questions

### Is tonestro free?

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

### Is Cello Key free?

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

### Which has better reviews, tonestro or Cello Key?

tonestro is rated higher. tonestro averages 4.4 out of 5 from 2.4K ratings, while Cello Key averages 3.5 from 2 ratings.

### Do tonestro or Cello Key have ads?

Both tonestro and Cello Key show ads.

### Which is updated more often, tonestro or Cello Key?

tonestro ships an update weekly, and Cello Key every 6 months. Most recently, tonestro was updated on October 29, 2026 and Cello Key on October 24, 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.*