---
title: "Guitar Tuner! — App Overview"
url: https://marlvel.ai/intel-report/music/com-peterdeelstra-guitartuner
category: Music
developer: Peter Deelstra
platforms: ios
rating: 4.8 (353 ratings)
pricing: paid
report_level: overview
generated: 2026-04-18
last_verified: "2026-04-23T07:15:27.564Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** This is a straightforward, one-time purchase utility that prioritizes high-accuracy tuning without the distraction of ads or recurring subscription fees.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Music |
| Rating | 4.8 ★ (353) |
| Pricing | paid |
| Platforms | iOS |
| Latest Version (iOS) | 2.4 |
| Developer | Peter Deelstra |

<!-- SECTION: Summary -->
## What is Guitar Tuner!?

Guitar Tuner! is a precision audio/visual tuning tool for guitarists that provides sub-second response times and accuracy within 1 cent. The app supports a wide range of standard and alternate tunings, including Drop D and Open C, while offering manual pitch calibration from 400 to 480 Hz.

<!-- SECTION: Key Features -->
## Key Features

- **Visual Tuning Interface**: Displays real-time pitch deviation in cents to help users visualize adjustments while tuning.
- **Extensive Tuning Library**: Supports standard E-A-D-G-B-E tuning alongside various alternate, open, lower, and higher tunings.
- **Pitch Calibration**: Allows users to adjust reference pitch incrementally between 400 and 480 Hz or relative to A440.
- **Auditory Reference**: Includes a tap-to-hear feature for users who prefer tuning by ear.

<!-- SECTION: Target Audience -->
## Who is it for?

Guitarists and musicians seeking a high-precision, ad-free tuning utility for standard and alternate tunings.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/guitar-tuner/id400038851?uo=2)
- [Full Intelligence Report](https://marlvel.ai/intel-report/music/com-peterdeelstra-guitartuner)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/music/com-peterdeelstra-guitartuner).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*