---
title: "Timer 555 Calculator Pro - Reviews, Revenue and Downloads in United States | Apple App Store"
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 maki"
---

# Timer 555 Calculator Pro — United States

![Timer 555 Calculator Pro App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/83/cd/f8/83cdf8f0-f4d7-b96c-d66c-ff93399c2a67/AppIcon-0-0-1x_U007emarketing-0-7-0-85-220.png/434x0w.png)

**Developer:** [Siu Yuen Ho](https://apptail.io/developer/siu-yuen-ho-Wqc)
**Category:** Utilities
**Rating:** 4.7/5 (3 ratings)
**Price:** Free
**Bundle ID:** com.peterhohsy.Timer-555-Calculator-Pro
**Store:** Apple App Store
**Country:** United States
**Version:** 3.0.15 (released 2024-03-25)
**Original Release:** 2014-03-06
**Languages:** English, French, German, Hindi, Italian, Japanese, Korean, Portuguese, Russian, Chinese, Spanish

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id833443125)
**AppTail Page:** [https://apptail.io/app/timer-555-calculator-pro-Zppb/united-states](https://apptail.io/app/timer-555-calculator-pro-Zppb/united-states)

## Timer 555 Calculator Pro 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

## Timer 555 Calculator Pro Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource115/v4/5f/9d/10/5f9d107f-fea4-e422-42e2-6b2733b20883/90a42a23-28d0-4a23-8b79-7541559ef92f_Simulator_Screen_Shot_-_iPhone_12_Pro_Max_-_2021-05-16_at_08.25.36.png/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource125/v4/31/8a/09/318a09f0-020e-bb23-6949-6d9a2bb37299/cb60778b-9182-4da0-ac5d-4312a2c03149_Simulator_Screen_Shot_-_iPhone_12_Pro_Max_-_2021-05-16_at_08.25.52.png/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource125/v4/a2/76/e9/a276e91c-2cbf-cfb3-7a8a-72bc3c24c954/e62e3d41-a6ad-4e2e-907f-2ff563d52dce_Simulator_Screen_Shot_-_iPhone_12_Pro_Max_-_2021-05-16_at_08.25.59.png/1284x2778.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource115/v4/4f/aa/e3/4faae393-287f-403c-1f07-0b5b9ebea802/40778ea7-85de-460f-8a17-cb30bafeb63d_Simulator_Screen_Shot_-_iPhone_12_Pro_Max_-_2021-05-16_at_08.26.12.png/1284x2778.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource125/v4/ec/9f/9c/ec9f9c9a-2bd5-3ea9-6e5e-ef610c1a6411/640313b1-6174-45c2-87a3-e7b05fa83771_Simulator_Screen_Shot_-_iPhone_12_Pro_Max_-_2021-05-16_at_08.26.03.png/1284x2778.png)

## Timer 555 Calculator Pro Rating Breakdown in United States
- 5 stars: 2 (67%)
- 4 stars: 1 (33%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)




## Timer 555 Calculator Pro Discovered Keywords
- 555 calc

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## Timer 555 Calculator Pro Available In
- [United States](https://apptail.io/app/timer-555-calculator-pro-Zppb/united-states)
- [Sweden](https://apptail.io/app/timer-555-calculator-pro-Zppb/sweden)
- [New Zealand](https://apptail.io/app/timer-555-calculator-pro-Zppb/new-zealand)
- [France](https://apptail.io/app/timer-555-calculator-pro-Zppb/france)
- [Italy](https://apptail.io/app/timer-555-calculator-pro-Zppb/italy)
- [Belarus](https://apptail.io/app/timer-555-calculator-pro-Zppb/belarus)
- [Canada](https://apptail.io/app/timer-555-calculator-pro-Zppb/canada)
- [Switzerland](https://apptail.io/app/timer-555-calculator-pro-Zppb/switzerland)
- [Chile](https://apptail.io/app/timer-555-calculator-pro-Zppb/chile)
- [Colombia](https://apptail.io/app/timer-555-calculator-pro-Zppb/colombia)
- [Czechia](https://apptail.io/app/timer-555-calculator-pro-Zppb/czechia)
- [Germany](https://apptail.io/app/timer-555-calculator-pro-Zppb/germany)
- [Denmark](https://apptail.io/app/timer-555-calculator-pro-Zppb/denmark)
- [Dominican Republic](https://apptail.io/app/timer-555-calculator-pro-Zppb/dominican-republic)
- [Ecuador](https://apptail.io/app/timer-555-calculator-pro-Zppb/ecuador)
- [Egypt](https://apptail.io/app/timer-555-calculator-pro-Zppb/egypt)
- [Spain](https://apptail.io/app/timer-555-calculator-pro-Zppb/spain)
- [Finland](https://apptail.io/app/timer-555-calculator-pro-Zppb/finland)
- [United Kingdom](https://apptail.io/app/timer-555-calculator-pro-Zppb/united-kingdom)
- [Greece](https://apptail.io/app/timer-555-calculator-pro-Zppb/greece)
- [Hong Kong SAR China](https://apptail.io/app/timer-555-calculator-pro-Zppb/hong-kong)
- [Hungary](https://apptail.io/app/timer-555-calculator-pro-Zppb/hungary)
- [Indonesia](https://apptail.io/app/timer-555-calculator-pro-Zppb/indonesia)
- [Ireland](https://apptail.io/app/timer-555-calculator-pro-Zppb/ireland)
- [Israel](https://apptail.io/app/timer-555-calculator-pro-Zppb/israel)
- [India](https://apptail.io/app/timer-555-calculator-pro-Zppb/india)
- [Iceland](https://apptail.io/app/timer-555-calculator-pro-Zppb/iceland)
- [Japan](https://apptail.io/app/timer-555-calculator-pro-Zppb/japan)
- [South Korea](https://apptail.io/app/timer-555-calculator-pro-Zppb/south-korea)
- [Kuwait](https://apptail.io/app/timer-555-calculator-pro-Zppb/kuwait)
- [Kazakhstan](https://apptail.io/app/timer-555-calculator-pro-Zppb/kazakhstan)
- [Mexico](https://apptail.io/app/timer-555-calculator-pro-Zppb/mexico)
- [Malaysia](https://apptail.io/app/timer-555-calculator-pro-Zppb/malaysia)
- [Nigeria](https://apptail.io/app/timer-555-calculator-pro-Zppb/nigeria)
- [Netherlands](https://apptail.io/app/timer-555-calculator-pro-Zppb/netherlands)
- [Norway](https://apptail.io/app/timer-555-calculator-pro-Zppb/norway)
- [Nepal](https://apptail.io/app/timer-555-calculator-pro-Zppb/nepal)
- [Peru](https://apptail.io/app/timer-555-calculator-pro-Zppb/peru)
- [Philippines](https://apptail.io/app/timer-555-calculator-pro-Zppb/philippines)
- [Pakistan](https://apptail.io/app/timer-555-calculator-pro-Zppb/pakistan)
- [Poland](https://apptail.io/app/timer-555-calculator-pro-Zppb/poland)
- [Portugal](https://apptail.io/app/timer-555-calculator-pro-Zppb/portugal)
- [Romania](https://apptail.io/app/timer-555-calculator-pro-Zppb/romania)
- [Russia](https://apptail.io/app/timer-555-calculator-pro-Zppb/russia)
- [Saudi Arabia](https://apptail.io/app/timer-555-calculator-pro-Zppb/saudi-arabia)
- [Singapore](https://apptail.io/app/timer-555-calculator-pro-Zppb/singapore)
- [Thailand](https://apptail.io/app/timer-555-calculator-pro-Zppb/thailand)
- [Tunisia](https://apptail.io/app/timer-555-calculator-pro-Zppb/tunisia)
- [Türkiye](https://apptail.io/app/timer-555-calculator-pro-Zppb/turkey)
- [Taiwan](https://apptail.io/app/timer-555-calculator-pro-Zppb/taiwan)
- [Ukraine](https://apptail.io/app/timer-555-calculator-pro-Zppb/ukraine)
- [United Arab Emirates](https://apptail.io/app/timer-555-calculator-pro-Zppb/united-arab-emirates)
- [Vietnam](https://apptail.io/app/timer-555-calculator-pro-Zppb/vietnam)
- [Argentina](https://apptail.io/app/timer-555-calculator-pro-Zppb/argentina)
- [Australia](https://apptail.io/app/timer-555-calculator-pro-Zppb/australia)
- [Azerbaijan](https://apptail.io/app/timer-555-calculator-pro-Zppb/azerbaijan)
- [Brazil](https://apptail.io/app/timer-555-calculator-pro-Zppb/brazil)

---

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