# Tuner B2 vs 弦外古琴工具箱

The clearest difference is in-app purchases: 弦外古琴工具箱 at none against Tuner B2's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Tuner B2 sells 2 in-app purchases, starting at $1.99 per year. 弦外古琴工具箱 asks for nothing beyond the download.

Tuner B2 ships an update every 2 weeks, 弦外古琴工具箱 every 9 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Tuner B2 | 弦外古琴工具箱 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 85.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | Freemium | — |
| Size | 5 MB | 63 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [守群 赵](https://appshunter.io/developer/963658407) | [Chongqing Potential Space Technology Co., Ltd.](https://appshunter.io/developer/1820821694) |

## What reviewers say

### Tuner B2

[App page](https://appshunter.io/ios/app/tuner-b2/id6755300645)

This app precisely tunes a wide variety of string and wind instruments using real-time audio analysis. It offers automatic pitch detection, octave display, and support for alternate tunings, making it a versatile tool for musicians.

**Highlights:** Automatic pitch detection, Real-time frequency display, Support for numerous instruments, Alternate tuning options, Semitone tuning, Octave display

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual subscription | $1.99 | per year |
| Lifetime membership | $29.99 | one-time |


### 弦外古琴工具箱

[App page](https://appshunter.io/ios/app/id6794813221)

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

**In-app purchases:** none


## Frequently asked questions

### Is Tuner B2 free?

Tuner B2 is free to download, with in-app purchases available.

### Is 弦外古琴工具箱 free?

弦外古琴工具箱 is free to download, with no in-app purchases.

### Do Tuner B2 or 弦外古琴工具箱 have ads?

Neither Tuner B2 nor 弦外古琴工具箱 shows ads.

### Which is updated more often, Tuner B2 or 弦外古琴工具箱?

Tuner B2 ships an update every 2 weeks, and 弦外古琴工具箱 every 9 days. Most recently, Tuner B2 was updated on October 25, 2026 and 弦外古琴工具箱 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.*