# Guitar Tuner vs Sentry BLE

The clearest difference is ads: Sentry BLE at none against Guitar Tuner's shown. Sentry BLE also leads on update cadence (every 6 weeks vs every 9 months) and iOS requirement (13.1 vs 15.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Guitar Tuner ships an update every 9 months, Sentry BLE every 6 weeks. The most recent releases landed on October 24, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Guitar Tuner | Sentry BLE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (3.9K ratings)](https://appshunter.io/ios/app/guitar-tuner/id310457191/reviews)** | — |
| Number of ratings | **3.9K** | — |
| Positive reviews | 72.9% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 9 months | **Every 6 weeks** |
| Monetization | Ad-supported | — |
| Size | 9 MB | 66 MB |
| Requires iOS | 15.0 | **13.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Alvin Yu](https://appshunter.io/developer/310457194) | [Vision Metering](https://appshunter.io/developer/1567248925) |

## What reviewers say

### Guitar Tuner

[App page](https://appshunter.io/ios/app/guitar-tuner/id310457191)

Tune your 6-string guitar with precise reference notes. Supports standard tuning and more. Ensure your device is not on silent to hear the tuning tones.

**Highlights:** Accurate reference notes, Supports standard tuning (E A D G B e), Supports more tunings, Clear tuning tones, Device not on silent required

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

**In-app purchases:** none


### Sentry BLE

[App page](https://appshunter.io/ios/app/sentry-ble/id6752409845)

**In-app purchases:** none


## Frequently asked questions

### Is Guitar Tuner free?

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

### Is Sentry BLE free?

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

### Do Guitar Tuner or Sentry BLE have ads?

Guitar Tuner shows ads; Sentry BLE does not.

### Which is updated more often, Guitar Tuner or Sentry BLE?

Guitar Tuner ships an update every 9 months, and Sentry BLE every 6 weeks. Most recently, Guitar Tuner was updated on October 24, 2026 and Sentry BLE on September 16, 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.*