# Key Lens vs TONAUT

The clearest difference is price: Key Lens at Free against TONAUT's $14.99. TONAUT's advantage is in-app purchases (none vs 1) and update cadence (daily vs every 5 weeks). On ads, device support and iOS requirement there is nothing between them.

Key Lens is free to download; TONAUT costs $14.99 up front. Key Lens sells 1 one-off in-app purchase. TONAUT asks for nothing beyond the download.

Key Lens ships an update every 5 weeks, TONAUT daily. The most recent releases landed on October 28, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Key Lens | TONAUT |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/tonaut/id6812577930/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Daily** |
| Best chart rank | — | **#67** |
| Size | 64 MB | 108 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Alex Amayo](https://appshunter.io/developer/1835625743) | [Richard Rogers](https://appshunter.io/developer/6786053832) |

## What reviewers say

### Key Lens

[App page](https://appshunter.io/ios/app/key-lens/id6761850903)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Midi Output | $9.99 | one-time |


### TONAUT

[App page](https://appshunter.io/ios/app/tonaut/id6812577930)

**Currently charting:** #67 Top Paid · Music (US App Store)

**Features:** iPhone Duo support

**In-app purchases:** none


## Frequently asked questions

### Is Key Lens free?

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

### Is TONAUT free?

TONAUT costs $14.99, with no in-app purchases.

### Do Key Lens or TONAUT have ads?

Neither Key Lens nor TONAUT shows ads.

### Which is updated more often, Key Lens or TONAUT?

Key Lens ships an update every 5 weeks, and TONAUT daily. Most recently, Key Lens was updated on October 28, 2026 and TONAUT on November 1, 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.*