Lambda Tuner vs RC Circuit Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lambda Tuner
This tool helps tune PID controllers using the Lambda method to calculate P, I, and D parameters. It's designed for intuitive use in various process industries and works on self-regulating and integrating loops. You can also use it to learn the impact of different PID parameters.
- Lambda method for PID parameter calculation
- Supports self-regulating and integrating loops
- Intuitive and easy to use interface
- Adjustable Lambda value for reaction speed
- Manual PID parameter testing
- Educational tool for PID parameter impact
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Lambda Tuner is a tool for tuning PID controllers. It is using the “Lambda method” to calculate the P,I and D parameters. It works on self-regulating loops and integrating loops. It's designed to be intuitive, easy to use and is suitable for any kind of process industry. To calculate the parameters you need to describe your process with four values. After that you select the Lambda value, thats a value of how fast you want your controller to react. You can test to manually set the PID parameters, to test if your process description behaves similar in the calculation as in reality. It can also be used as a tool to learn the different impact of the PID parameters.
RC Circuit Pro
Calculate RC charging and filter circuits with ease. This tool helps hobbyists and engineers determine time constants, component values, and cutoff frequencies. Save and export your circuit data for further analysis.
- Calculate time constant
- Find component values (R, C)
- Determine voltage at time t
- Calculate cutoff frequency
- Save data to CSV
- Export data via AirDrop/iCloud Drive
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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, German, French, Italian, Spanish, Portuguese, Japanese, Traditional Chinese, Simplified Chinese
Screenshots
Verdict
The clearest difference is rating: Lambda Tuner at 3.3 against RC Circuit Pro's 1.0. Lambda Tuner also leads on ratings volume (3 vs 1). RC Circuit Pro's advantage is update cadence (every 4 months vs every 19 months) and price ($0.99 vs $3.99). On ads, in-app purchases, monetization model 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
Lambda Tuner costs $3.99 and RC Circuit Pro $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Lambda Tuner holds the better App Store score, 3.3 against 1.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.
Lambda Tuner ships an update every 19 months, RC Circuit Pro every 4 months. The most recent releases landed on July 5, 2026 and June 4, 2026 respectively.
| Parameter | Lambda Tuner | RC Circuit Pro |
|---|---|---|
| Price | $3.99 | $0.99 — better |
| Rating | 3.3 (3 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 19 months | Every 4 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 9.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Johan Bjors | Siu Yuen Ho |
Customer experience
Lambda Tuner
RC Circuit Pro
In-app purchases
Lambda Tuner
No in-app purchases
RC Circuit Pro
No in-app purchases
