DigiCompCalc vs 555 Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DigiCompCalc
This utility app simplifies digital power compensator coefficient calculations. It allows users to input data and obtain results directly on their mobile device, eliminating the need for complex desktop software. Results can be emailed for easy sharing.
- Calculate coefficients from analog compensator values
- Calculate coefficients directly using poles and zeros
- Email results
- Remembers last calculated variables
- Dark Mode support
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Are you tired of using Excel or Matlab to calculate the coefficients for your digital power compensator? Do you want to do the calculations in the palm of your hand, just by entering the pertinent data? Then the Digital Compensator Calculator (DigiCompCalc) is for you! You no longer have to buy Matlab for just a few simple digital filter calculations. For use with Type II and Type III error amplifiers. Features: • Free! No Ads! • Calculate coefficients using the values from an analog compensator • Calculate coefficients directly using poles and zeros • Email results to yourself or your firmware designer • Remembers last set of calculated variables • Dark Mode support Install DigiCompCalc today!
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.
Screenshots
Verdict
The clearest difference is review sentiment: DigiCompCalc at 100% against 555 Calc's 50%. DigiCompCalc also leads on rating (5.0 vs 4.0) and ads (none vs shown). 555 Calc's advantage is update cadence (every 20 months vs every 68 months) and device support (3 vs 1). On price, ratings volume and in-app purchases 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.
DigiCompCalc holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 100% of DigiCompCalc's written reviews are positive against 50% of 555 Calc's.
DigiCompCalc ships an update every 68 months, 555 Calc every 20 months. The most recent releases landed on October 5, 2026 and September 27, 2026 respectively.
| Parameter | DigiCompCalc | 555 Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.0 (3 ratings) |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 68 months | Every 20 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Ernie Zappacosta | Jibiki Works |
Customer experience
DigiCompCalc
555 Calc
In-app purchases
DigiCompCalc
No in-app purchases
555 Calc
No in-app purchases
Questions
Is DigiCompCalc free?
Is 555 Calc free?
Which has better reviews, DigiCompCalc or 555 Calc?
Do DigiCompCalc or 555 Calc have ads?
Which is updated more often, DigiCompCalc or 555 Calc?
Other comparisons
