# Timer 555 Calculator Pro

> Utilities

Canonical page: [https://chrome-stats.com/d/id833443125](https://chrome-stats.com/d/id833443125)

## Overview

- **ID:** `id833443125`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Siu Yuen Ho
- **Category:** Utilities
- **Rating:** 4.70 / 5 (3 ratings)
- **Version:** 3.0.15
- **Last updated:** 2024-03-25
- **First published:** 2014-03-06
- **Size:** 3.09 MB
- **Data as of:** 2026-09-06
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/timer-555-calculator-pro/id833443125)
- **Privacy policy:** [http://peterho386.weebly.com/uploads/6/7/6/9/6769822/private\_policy\_general.htm](http://peterho386.weebly.com/uploads/6/7/6/9/6769822/private_policy_general.htm)

## Description

This app is used to calculate monostable and astable circuit.

Features
* Calculate pulse width of monostable circuit
* Calculate frequency of astable circuit
* Find out combination of components making a desire pulse width in monostable circuit
* Find out combination of components making a desire frequency in astable circuit
* Share file to iCloud Drive (For iOS8 or later)
* Share file via AirDrop

Additional Features in the Professional Edition
* Unlimited number of combinations
* Allow to change  tolerance
* No ads

## Rankings

- #570,211 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id833443125)