# RacquetTune - String Tension

> Racquet optimization tools

Canonical page: [https://chrome-stats.com/d/id365729342](https://chrome-stats.com/d/id365729342)

## Overview

- **ID:** `id365729342`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Sten Kaiser
- **Category:** Sports
- **Rating:** 4.60 / 5 (481 ratings)
- **Version:** 7.7
- **Last updated:** 2026-04-02
- **First published:** 2010-04-07
- **Size:** 11 MB
- **Data as of:** 2026-09-23
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/racquettune-string-tension/id365729342)
- **Privacy policy:** [http://racquettune.com/privacy/](http://racquettune.com/privacy/)

## Description

RacquetTune - String Tension is a Chrome extension that listens to the sound of strings to measure tension with high accuracy. It also provides a swingweight calculator and a stiffness calculator to help you tailor racquets to your stroke.

Designed for tennis, squash, racquetball, and badminton, RacquetTune tracks tension history, exports test data by email, and helps verify stringer consistency. View a demo at racquettune.com to see it in action.

## Rankings

- #74,551 — Overall
- #20 — Sports (Paid)
- #20 — string

## Review summary

Reviewers praise RacquetTune for tracking tension decay and serving as a useful reference, and some call it close to an industry standard for relative measurements. However, many reports cite inconsistent/incorrect absolute readings, reliability problems after updates, and a heavy reliance on correct string-factor calibration and database data. Support and UX concerns appear, making it a powerful but imperfect tool for stringing decisions.

### Pros

- Excellent for tracking tension loss over time with graphs and logs, helping plan restringing and monitor string wear
- Readings can be relatively accurate and consistent enough to compare rackets and strings, serving as a practical reference
- Useful for customizing rackets thanks to a database of strings and customizable string factors
- Helpful instructions and an easy-to-read interface once set up, making it easy to use
- Considered by many as a close to industry-standard tool for relative tension measurements

### Cons

- Absolute tension readings are often inconsistent or far from actual values, with large discrepancies between attempts
- App reliability issues: measurements can stop, updates can break functionality, and support is reportedly lacking
- User experience and setup can be non-intuitive; the app’s dependence on correct string factor and database data adds complexity
- Need to calibrate string factor carefully for accuracy; online database can be hit-or-miss and misleads without personal calibration
- Some users feel it’s not worth the price due to reliability issues and inconsistent results

## Similar extensions and apps

- [RacquetTuner](https://chrome-stats.com/d/id6755720177) — 1.00 / 5
- [RacketTune](https://chrome-stats.com/d/id6746103106) — 3.50 / 5
- [String Tension AI](https://chrome-stats.com/d/id6763697805) — 5.00 / 5
- [StringTension](https://chrome-stats.com/d/id6761807131)
- [String Tension Meter](https://chrome-stats.com/d/id6782812710)
- [SweetSpot: Racket Tension](https://chrome-stats.com/d/id6742414896) — 3.80 / 5
- [mystrings - Tennis](https://chrome-stats.com/d/id6670494565)
- [Tennis Custom](https://chrome-stats.com/d/id6761192994) — 5.00 / 5
- [Tennis Setup Tracker](https://chrome-stats.com/d/id6757754557) — 1.00 / 5
- [TennisTension Pro](https://chrome-stats.com/d/id6741165303) — 2.00 / 5
- [stringster for Tennis 2.0](https://chrome-stats.com/d/id6446997820) — 1.90 / 5
- [Tensora: String Tension](https://chrome-stats.com/d/id6777744797)

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Source: [Chrome-Stats](https://chrome-stats.com/d/id365729342)