555 Calc vs Circuit Resistance Creator
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
Read full descriptionHide full description
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.
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
Read full descriptionHide full description
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 review sentiment: Circuit Resistance Creator at 100% against 555 Calc's 50%. Circuit Resistance Creator also leads on rating (5.0 vs 4.0) and ads (none vs shown). 555 Calc's advantage is iOS requirement (11.0 vs 14.0). On price, ratings volume, 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.
Circuit Resistance Creator holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews point the same way: 50% of 555 Calc's written reviews are positive against 100% of Circuit Resistance Creator's.
555 Calc ships an update every 20 months, Circuit Resistance Creator every 3 weeks. The most recent releases landed on October 28, 2026 and September 26, 2026 respectively.
| Parameter | 555 Calc | Circuit Resistance Creator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (3 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 3 | 3 |
| Update frequency | Every 20 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 18 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Jibiki Works | David White |
Customer experience
555 Calc
Circuit Resistance Creator
In-app purchases
555 Calc
No in-app purchases
Circuit Resistance Creator
No in-app purchases
Questions
Is 555 Calc free?
Is Circuit Resistance Creator free?
Which has better reviews, 555 Calc or Circuit Resistance Creator?
Do 555 Calc or Circuit Resistance Creator have ads?
Which is updated more often, 555 Calc or Circuit Resistance Creator?
Other comparisons
