Apps by Siu Yuen Ho
Timer 555 Calculator app icon

Utilities

Timer 555 Calculator

Siu Yuen Ho

Free download 3.88 · 1 storefront · 8 ratings In-app purchases unconfirmed
Open on Apple

About this app

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 * Saving component values in CSV file * Upload generated CSV files via AirDrop or iCloud Drive * Support English, German, French, Italian, Spanish, Portuguese, Japanese, Korean, Russian

Latest release

What’s New

Version 3.0.20 May 14, 2025

Fix minor bugs

Audience growth

Ratings growth

Steady
7-day gain +0
Ratings / day 0.0
30-day gain +0
US rating-count history
8 ratings
8 Oct 12, 2026 · 8 ratings Oct 12, 2026

Baseline captured. Growth appears after the crawler observes a changed rating count.

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

Price tracking

Price intelligence

1 captured event
Current Free
Historical low Free
Paid → free 0×
Price history
Current Free
Free Oct 12, 2026 · Free Oct 12, 2026 · Free Oct 12, 2026 Oct 12, 2026
  1. First observed Oct 12, 2026 · 8:40 PM Free

Screenshots

Timer 555 Calculator iPhone screenshotTimer 555 Calculator iPhone screenshotTimer 555 Calculator iPhone screenshotTimer 555 Calculator iPhone screenshotTimer 555 Calculator iPhone screenshot Timer 555 Calculator iPad screenshotTimer 555 Calculator iPad screenshotTimer 555 Calculator iPad screenshotTimer 555 Calculator iPad screenshotTimer 555 Calculator iPad screenshot