# Pendulum: Physics Timer — Oscillation Period & Gravity

> Oscillation Period & Gravity (iPhone/iPad app by Kyu-Hee Jang.)

- Source: https://appshunter.io/ios/app/pendulum-physics-timer/id6761253911 (this page in markdown: same URL + `.md`)
- Developer: [Kyu-Hee Jang](https://appshunter.io/developer/1587578867)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 17+
- Requires: iOS 15.1 · 31 MB
- Languages: American English
- Released: 2026-03-31
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/pendulum-physics-timer/id6761253911/reviews.md

## What is Pendulum?

Pendulum Lab+ turns your iPhone into a real pendulum physics experiment. Hang your phone on a string, swing it, and the accelerometer measures the period, frequency, and calculates gravitational acceleration.

Real sensor data — not a simulation. Perfect for physics classrooms and STEM education.

Key Features:
- Real-time pendulum period/frequency measurement
- Gravity (g) calculation from string length
- Live acceleration waveform graph
- Standard value comparison
- Education mode with formulas and explanations
- Multiple experiment recording and averaging
- CSV export for lab reports

The physics lab in your pocket.


## Version history (last 1 release)

### 1.0 — 2026-03-31

No release notes.

## More apps by Kyu-Hee Jang

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- [Barometer: Air Pressure](https://appshunter.io/ios/app/barometer-air-pressure/id6759883097)

All apps by Kyu-Hee Jang: https://appshunter.io/developer/1587578867

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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 2026-05-19.*