Timer 555 Calculator vs Circuit Resistance Creator
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
Circuit Resistance Creator
Calculate equivalent resistance for any resistor circuit. This tool is designed for students, technicians, and engineers, offering high accuracy for voltage, current, and resistance. It's a great way to check homework and perform engineering calculations.
- Equivalent resistance calculation
- Supports any resistor circuit
- High accuracy displays (6 decimal places)
- Apply custom circuit voltages
- Designed for students and engineers
- Homework checking tool
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Features: - Designed for students, technicians and engineers. - Find Equivalent Resistance for any resistor circuit. - Great Engineering tool. - Great for checking homework. - Super accurate with 6 decimal voltage, current and ohms displays. - Apply any circuit voltage from 1 to 1000 volts, with 3 decimal accuracy. - FREE and NO ADVERTISEMENTS.
Screenshots
Verdict
The clearest difference is rating: Circuit Resistance Creator at 5.0 against Timer 555 Calculator's 3.9. Circuit Resistance Creator also leads on in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 3 months). On price, review sentiment, ratings volume and ads 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. Circuit Resistance Creator asks for nothing beyond the download.
Circuit Resistance Creator holds the better App Store score, 5.0 against 3.9. Both are backed by a comparable volume of ratings — 8 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Timer 555 Calculator ships an update every 3 months, Circuit Resistance Creator every 3 weeks. The most recent releases landed on October 21, 2026 and September 26, 2026 respectively.
| Parameter | Timer 555 Calculator | Circuit Resistance Creator |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (8 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 8 — better | 3 |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.2 — better | 14.0 |
| Further details — not scored | ||
| Size | 3 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | David White |
Customer experience
Timer 555 Calculator
Circuit Resistance Creator
In-app purchases
Timer 555 Calculator
- Unlock Pro feature$0.99
Circuit Resistance Creator
No in-app purchases
Questions
Is Timer 555 Calculator free?
Is Circuit Resistance Creator free?
Which has better reviews, Timer 555 Calculator or Circuit Resistance Creator?
Do Timer 555 Calculator or Circuit Resistance Creator have ads?
Which is updated more often, Timer 555 Calculator or Circuit Resistance Creator?
Other comparisons
