# Lambda Tuner vs RC Circuit Pro

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.

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.

## The numbers

| Metric | Lambda Tuner | RC Circuit Pro |
| --- | --- | --- |
| Price | $3.99 | **$0.99** |
| Rating | **[3.3 (3 ratings)](https://appshunter.io/ios/app/lambda-tuner/id632731065/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/rc-circuit-pro/id824145786/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 4 months** |
| Monetization | Paid | Paid |
| Size | 1 MB | 17 MB |
| Requires iOS | 16.6 | **9.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Johan Bjors](https://appshunter.io/developer/632731068) | [Siu Yuen Ho](https://appshunter.io/developer/814088527) |

## What reviewers say

### Lambda Tuner

[App page](https://appshunter.io/ios/app/lambda-tuner/id632731065)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


### RC Circuit Pro

[App page](https://appshunter.io/ios/app/rc-circuit-pro/id824145786)

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.

**Highlights:** 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

**In-app purchases:** none


## Frequently asked questions

### Is Lambda Tuner free?

Lambda Tuner costs $3.99, with no in-app purchases.

### Is RC Circuit Pro free?

RC Circuit Pro costs $0.99, with no in-app purchases.

### Which has better reviews, Lambda Tuner or RC Circuit Pro?

Lambda Tuner is rated higher. Lambda Tuner averages 3.3 out of 5 from 3 ratings, while RC Circuit Pro averages 1.0 from 1 ratings.

### Do Lambda Tuner or RC Circuit Pro have ads?

Neither Lambda Tuner nor RC Circuit Pro shows ads.

### Which is updated more often, Lambda Tuner or RC Circuit Pro?

Lambda Tuner ships an update every 19 months, and RC Circuit Pro every 4 months. Most recently, Lambda Tuner was updated on July 5, 2026 and RC Circuit Pro on June 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*