Timer 555 Calculator vs Resistor
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
Quickly calculate resistor values from color bands or SMD codes, and vice versa. This tool is ideal for electronics enthusiasts, students, and DIYers working with 4, 5, or 6-band resistors and various SMD codes. It functions offline and requires no registration.
- Calculate resistor values from color bands
- Convert resistor values to color bands
- Supports 4, 5, and 6-band resistors
- Handles SMD codes (EIA-3, EIA-4, EIA-96)
- Works offline
- No registration required
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Resistor Converter – Fast & Easy Calculate resistor values, color bands, and SMD codes in seconds – perfect for electronics hobbyists, students, and professionals. Supports 4-, 5-, and 6-band resistors as well as SMD codes (EIA-3, EIA-4, EIA-96). - Tap color bands → read the value - Enter resistor → get matching color bands & SMD codes - Works offline, no registration required - Perfect for electronics, study & DIY projects Simple, fast, and free – the perfect companion for every electronics enthusiast!
Screenshots
Verdict
The clearest difference is rating: Resistor at 4.9 against Timer 555 Calculator's 3.9. Resistor also leads on in-app purchases (none vs 1). Timer 555 Calculator's advantage is update cadence (every 3 months vs every 9 months) and iOS requirement (13.2 vs 26.0). On price, ratings volume, ads and device support 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 asks for nothing beyond the download.
Resistor holds the better App Store score, 4.9 against 3.9. Both are backed by a comparable volume of ratings — 8 and 19 respectively.
Timer 555 Calculator ships an update every 3 months, Resistor every 9 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.
| Parameter | Timer 555 Calculator | Resistor |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (8 ratings) | 4.9 (19 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 8 | 19 — better |
| Update frequency | Every 3 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.2 — better | 26.0 |
| Further details — not scored | ||
| Size | 3 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | Gerhard Lentschik |
Customer experience
Timer 555 Calculator
Resistor
In-app purchases
Timer 555 Calculator
- Unlock Pro feature$0.99
Resistor
No in-app purchases
Questions
Is Timer 555 Calculator free?
Is Resistor free?
Which has better reviews, Timer 555 Calculator or Resistor?
Do Timer 555 Calculator or Resistor have ads?
Which is updated more often, Timer 555 Calculator or Resistor?
Other comparisons
