RC Circuit vs 555 Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RC Circuit
Calculate RC charging and filter circuits, including time constants and cutoff frequencies. Find component values from these parameters or get voltage at specific times. Save and share data easily.
- Calculate time constant
- Find component values
- Get voltage at time t
- Calculate cutoff frequency
- Save data to CSV
- Upload CSV via AirDrop/iCloud Drive
- Multi-language support
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This app is used to calculate the RC charging and RC filter circuit. It is suitable for hobbyist or electronic engineer. Features * Calculate time constant from R, C * Find component value R,C from time constant * Get voltage at time t in RC charging / discharging * Calculate cutoff frequency by R, C * Find component value R,C from cutoff frequency * Save data to CSV files * Upload CSV via AirDrop / iCloud Drive * Support English, Traditional Chinese, Simplified Chinese, German, French, Italian, Spanish, Portuguese, Japanese
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 rating: RC Circuit at 4.8 against 555 Calc's 4.0. RC Circuit also leads on ads (none vs shown) and update cadence (every 6 months vs every 20 months). 555 Calc's advantage is in-app purchases (none vs 1). On price, ratings volume, device support and iOS requirement 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. RC Circuit sells 1 one-off in-app purchase. 555 Calc asks for nothing beyond the download.
RC Circuit holds the better App Store score, 4.8 against 4.0. Both are backed by a comparable volume of ratings — 5 and 3 respectively.
RC Circuit ships an update every 6 months, 555 Calc every 20 months. The most recent releases landed on October 5, 2026 and October 13, 2026 respectively.
| Parameter | RC Circuit | 555 Calc |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5 ratings) — better | 4.0 (3 ratings) |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | 5 — better | 3 |
| Update frequency | Every 6 months — better | Every 20 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 16 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | Jibiki Works |
Customer experience
RC Circuit
555 Calc
In-app purchases
RC Circuit
- Unlock Pro features$0.99
555 Calc
No in-app purchases
Questions
Is RC Circuit free?
Is 555 Calc free?
Which has better reviews, RC Circuit or 555 Calc?
Do RC Circuit or 555 Calc have ads?
Which is updated more often, RC Circuit or 555 Calc?
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