# ReString - Guitar Tuner & Care — Strobe Tuner, QA & String Log

> Strobe Tuner, QA & String Log (iPhone/iPad app by Akihiro Yamamoto.)

- Source: https://appshunter.io/ios/app/restring-guitar-tuner-and-care/id6798475290 (this page in markdown: same URL + `.md`)
- Developer: [Akihiro Yamamoto](https://appshunter.io/developer/6798475292)
- Category: Music, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 60 MB
- Languages: American English, German (Germany), Japanese, Chinese (Simplified, China), European Spanish
- Released: 2026-08-19
- Data updated: 2026-09-07
- User reviews in markdown: https://appshunter.io/ios/app/restring-guitar-tuner-and-care/id6798475290/reviews.md

## What is ReString?

The definitive all-in-one acoustic suite and gear manager designed exclusively for classical guitarists and luthiers. Powered by our proprietary DSP acoustic engine, ReString elevates your playing with ultra-precise strobe tuning, physical string quality diagnosis, objective practice analytics, and comprehensive string lifecycle tracking.

Key Features
1. Advanced Acoustic Strobe Tuner (±0.1 Cent Precision)

Real-time Strobe Engine: Smooth rotating animation and dynamic pitch ribbon with automatic zoom for microtonal tuning accuracy.

Key & Chord Sweetened Tuning: Mitigate classical guitar’s notorious 3rd-string beat muddiness and offset natural fretting sharping (+2 to +4 cents on low positions).

Dyad Beat Tuning: Visualize acoustic beat frequencies (Hz) and modulation rates in real time when playing two notes simultaneously.

Presets & Custom Profiles: Standard, Drop D, Double Drop D, Lute tuning (3rd F#), DADGAD, and custom temperaments.

2. String Quality QA & Defect Detection (Uniformity Analyzer)

Unroundness & Beat Modulation: Analyze open string resonance to detect core wire inconsistency, eccentric thickness, and harmonic disuniformity.

12th Fret Intonation Check: Compare open vs. 12th fret harmonics and pressed frets to spot false strings and intonation flaws.

Objective QA Score: Instant 100-point rating and radar charts to safeguard against defective string batches and track aging wear.

3. Practice Analyzer & Acoustic Feedback

Tremolo (p-a-m-i): Separate high-speed strikes up to 790 bpm, quantifying rhythmic spacing, note clarity, and dynamic consistency.

Arpeggios: Isolate high-string attacks despite bass resonance, measuring balance and projection across voices.

Alternating Stroke Scale (i-m / m-a / i-a): Measure timing intervals, velocity balance, and spectral brightness on our intuitive 50%:50% balance bar.

Harmonics Spectral Purity: Dual-peak meter measuring decibel ratio between target overtone and residual fundamental leakage (12F, 7F, 5F, artificial).

4. Acoustic Metronome & DSP Tempo Detection

Tempo Reverse Calculation: Detects your playing attack onsets via microphone to automatically estimate and lock your natural BPM.

Acoustic Sound Library: Natural woodblock and subtle tick samples designed to blend harmoniously with acoustic nylon instruments.

Subdivisions & Time Signatures: From 1 to 12 beats, triplets, 16ths, and intuitive tap tempo.

5. Active Strings Dashboard & Inventory Management

Active String Status: Monitor mounted strings, installation dates, elapsed days, and tension at a glance.

Custom Mix Support: Register hybrid string configurations (e.g., carbon trebles paired with nylon basses).

Bento Grid Dashboard: Beautifully organize multiple guitars, maintenance reminders, and string wear.

Inventory Stock Tracking: Manage spare sets and single strings at home; log string changes with one tap.

6. String Specs Database & Tone Recordings

Comprehensive Catalog: Specs, tensions, and materials for Savarez, D'Addario, Augustine, Hannabach, Knobloch, La Bella, Aquila, and more.

Built-in Audio Diary: Record and compare sound clips across string lifecycles and different guitar woods.

Cloud Sync: Seamless multi-device synchronization powered by Firebase.


## Version history (last 5 releases)

### 2.6.86 — 2026-09-05

Added click sound playback (Main beats / All notes / None) and audio-visual sync latency calibration to the practice metronome sync mode.
Improved practice audio recording, hit detection precision, and note highway visual synchronization.
Optimized the tempo detector (Listen & Tap) UI responsiveness and microphone lifecycle management.
Made the public feed filter and search bar collapsible for better screen usability.

### 2.6.84 — 2026-09-04

Improved local storage persistence for tuner and metronome user settings (temperament mode, key, chord, alternate tunings, scale length, string materials, guitar selection, mic sensitivity, volume, etc.) so they are reliably saved and restored on launch.
Expanded Technique Analyzer with Single-String Scale Alternation (timing evenness, volume, and tone balance for i-m/m-a/i-a) and Harmonics Spectrum Analysis (objective fundamental suppression ratio in dB and cent pitch accuracy), supporting 4 practice modes alongside Tremolo and Arpeggio.

### 2.6.80 — 2026-09-03

・Improved tuner accuracy and sustain stability on bass strings (5th & 6th).
・Added mic gain control and real-time input level meter to the tuner.
・Added Basic Practice mode for Tremolo and Arpeggio with timing and evenness analysis.

### 2.5.76 — 2026-09-02

Improved piezo/contact mic support ("Piezo 18x" mode & better low-sustain tracking)
Added "Favorite Strings" to quickly select, log, and manage sets in My Page
Added high-precision metronome with smart tempo detection (Listen & Tap)
Improved tuner accuracy: reduced 1st-string errors and steadier pitch detection
Enhanced String Quality Diagnosis with days-since-restring and waveform history
Revamped Dyad Beat Tuning with fret guides and a 3-point temperament gauge

### 2.4.68 — 2026-08-31

【Tuner Precision Auto-Zoom】When pitch approaches in-tune, the needle meter, pitch ribbon, and strobe display automatically zoom in (±10ct) for effortless fine-tuning and crystal-clear precision.
【Performance Reminder】Set your concert or performance date to receive timely restring reminders and daily countdown notifications leading up to the big day.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*