Guitar Tuner vs Sentry BLE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Guitar Tuner
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.
- Accurate reference notes
- Supports standard tuning (E A D G B e)
- Supports more tunings
- Clear tuning tones
- Device not on silent required
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Tune your 6-string guitar with clear, accurate reference notes. Includes standard tuning (E A D G B e) plus popular alternate tunings. Fast, simple, and reliable.
Sentry BLE
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This application is a configuration tool for Vision Metering GLS005 MIU. Unauthorized use is strictly prohibited.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Guitar Tuner | Sentry BLE |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (3.9K ratings) — better | — |
| Positive reviews | 72.9% of reviews | — |
| Number of ratings | 3.9K — better | — |
| Update frequency | Every 9 months | Every 6 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.1 — better |
| Further details — not scored | ||
| Size | 9 MB | 66 MB |
| Age rating | 4+ | 4+ |
| Developer | Alvin Yu | Vision Metering |
In-app purchases
Guitar Tuner
No in-app purchases
Sentry BLE
No in-app purchases
Questions
Is Guitar Tuner free?
Is Sentry BLE free?
Do Guitar Tuner or Sentry BLE have ads?
Which is updated more often, Guitar Tuner or Sentry BLE?
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