555 Calc vs Resistor Code Calculators
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
555 Calc
This utility app helps engineers and hobbyists calculate resistor values for circuits using the Timer IC 555. Simply input frequency, duty ratio, and capacitor values to get the required resistor outputs.
- Calculate resistor values
- Input frequency
- Input duty ratio
- Input capacitor value
- Timer IC 555 circuit design
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This App calculates registors value, when designing the circuit using Timer IC 555. How to (1) Input Frequency value. (2) Input Duty Ratio. (3) Input C1 Value. (4) Touch ‘Calculate’ button. (5) Registors value will be displayed. Note. * Set Duty Ratio to 50 ~ 99. * If you set Duty Ratio to 50, R1 value will be set to 0.
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 update cadence: Resistor Code Calculators at every 7 months against 555 Calc's every 20 months. 555 Calc's advantage is iOS requirement (11.0 vs 13.4). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
555 Calc ships an update every 20 months, Resistor Code Calculators every 7 months. The most recent releases landed on September 27, 2026 and September 17, 2026 respectively.
| Parameter | 555 Calc | Resistor Code Calculators |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (3 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 20 months | Every 7 months — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 13.4 |
| Further details — not scored | ||
| Size | 18 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Jibiki Works | Kanta Kikubo |
In-app purchases
555 Calc
No in-app purchases
Resistor Code Calculators
No in-app purchases
Questions
Is 555 Calc free?
Is Resistor Code Calculators free?
Do 555 Calc or Resistor Code Calculators have ads?
Which is updated more often, 555 Calc or Resistor Code Calculators?
Other comparisons
