Lambda Tuner vs Flow Rate Help
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.
Flow Rate Help
Calculate liquid flow rate, pipe diameter, or velocity with ease. Customize units for diameter, velocity, and flow rate, and set your preferred decimal places for precise results.
- Solve flow rate equations
- Customizable diameter units
- Customizable velocity units
- Customizable flow rate units
- Set decimal places
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Quickly find flow rate, required pipe diameter or velocity of a liquid! Features Include: - Accurately solve flow rate equations - Set preferred diameter unit from: mm, cm, m, km, inches, feet, yards and miles - Set preferred velocity unit from: m/s, m/min, km/min, km/h, ft/s, ft/min, mi/min and mph - Set preferred flow rate unit from: m³/s, m³/min, m³/h, l/s, l/min, l/h, gps. gpm and gph - Select your preferred number of decimal places
Screenshots
Verdict
The clearest difference is rating: Flow Rate Help at 4.3 against Lambda Tuner's 3.3. Flow Rate Help also leads on ratings volume (44 vs 3) and price ($0.99 vs $3.99). On update cadence, ads, in-app purchases and monetization model 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 Flow Rate Help $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Flow Rate Help holds the better App Store score, 4.3 against 3.3. That said, the two scores are not equally well evidenced: Flow Rate Help has 44 ratings behind it against 3, so its average is the more settled of the two.
Lambda Tuner ships an update every 19 months, Flow Rate Help every 15 months. The most recent releases landed on July 5, 2026 and August 6, 2026 respectively.
| Parameter | Lambda Tuner | Flow Rate Help |
|---|---|---|
| Price | $3.99 | $0.99 — better |
| Rating | 3.3 (3 ratings) | 4.3 (44 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 3 | 44 — better |
| Update frequency | Every 19 months | Every 15 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 16.6 | 11.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Johan Bjors | Armchair Engineering |
Customer experience
Lambda Tuner
Flow Rate Help
In-app purchases
Lambda Tuner
No in-app purchases
Flow Rate Help
No in-app purchases
Questions
Is Lambda Tuner free?
Is Flow Rate Help free?
Which has better reviews, Lambda Tuner or Flow Rate Help?
Do Lambda Tuner or Flow Rate Help have ads?
Which is updated more often, Lambda Tuner or Flow Rate Help?
Other comparisons
