Timer 555 Calculator vs Resistor Code Calculators
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Timer 555 Calculator
Calculate monostable and astable circuits for electronics projects. Determine pulse width and frequency, find component combinations, and save/upload data. Supports multiple languages.
- Monostable circuit pulse width calculation
- Astable circuit frequency calculation
- Component combination finder
- Save component values to CSV
- Upload CSV via AirDrop/iCloud Drive
- Multi-language support
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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
Resistor Code Calculators
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The one handy app for electrical engineering calculation. This app contains not only resistor color code and capacitor code calculators but also electrical filter, attenuator, rectifier, LC oscillator, RF, PCB trace, cable, Ohm's Law, skin effect, Lumen Candela conversion, Delta Y Conversion, and many other handy calculators.
Screenshots
Verdict
The clearest difference is in-app purchases: Resistor Code Calculators at none against Timer 555 Calculator's 1. Timer 555 Calculator's advantage is ads (none vs shown) and update cadence (every 3 months vs every 7 months). On price, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Timer 555 Calculator sells 1 one-off in-app purchase. Resistor Code Calculators asks for nothing beyond the download.
Timer 555 Calculator ships an update every 3 months, Resistor Code Calculators every 7 months. The most recent releases landed on September 24, 2026 and September 17, 2026 respectively.
| Parameter | Timer 555 Calculator | Resistor Code Calculators |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (8 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 3 months — better | Every 7 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.2 — better | 13.4 |
| Further details — not scored | ||
| Size | 3 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | Kanta Kikubo |
In-app purchases
Timer 555 Calculator
- Unlock Pro feature$0.99
Resistor Code Calculators
No in-app purchases
Questions
Is Timer 555 Calculator free?
Is Resistor Code Calculators free?
Do Timer 555 Calculator or Resistor Code Calculators have ads?
Which is updated more often, Timer 555 Calculator or Resistor Code Calculators?
Other comparisons
