Ratio Calc! vs Driveroom
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ratio Calc!
This app helps radio control car racers calculate their final drive ratio and rollout. Easily select your car, input gear sizes, and get instant results. It also offers charts and saves favorite cars for quick access.
- Calculate Final Drive Ratio (FDR)
- Calculate Rollout with tire diameter
- Filter cars by manufacturer and model
- Save favorite cars
- Select measurement units (imperial/metric)
- Select gear pitch
- View ratio and rollout charts
Read full descriptionHide full description
Ratio Calc is a quick and easy tool for radio control car racers to use trackside. Knowing your final drive ratio (FDR) is very useful for comparison with other racers to determine if your car is geared correctly. It lets you quickly select your car by filtering on manufacturer and model. Select your pinion and spur size and the FDR is displayed. Tyre diameter can also be entered to calculate your rollout. Ratio and roll out charts are also available which plot pinion and spur gear combinations to create very handy reference tables. - Save your favourite cars for quick access - Select measurement units (imperial/metric) - Select your preferred gear pitch, alternative ratios in other pitches will be shown - Over 2000 cars/variants in the database which is updated regularly
Driveroom
Read full descriptionHide full description
Driveroom App - gives you quick access to your kart racing results - enables customising your profile data (picture, name) - enables fast profile identification when signing up for the next race
Screenshots
Verdict
The clearest difference is price: Driveroom at Free against Ratio Calc!'s $2.99. Driveroom also leads on in-app purchases (none vs 4) and iOS requirement (9.0 vs 17.0). On update cadence, ads 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
Driveroom is free to download; Ratio Calc! costs $2.99 up front. Ratio Calc! sells 4 one-off in-app purchases. Driveroom asks for nothing beyond the download.
Ratio Calc! ships an update every 4 months, Driveroom every 2 months. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.
| Parameter | Ratio Calc! | Driveroom |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 4.5 (25 ratings) — better | — |
| Positive reviews | 87.5% of reviews | — |
| Number of ratings | 25 — better | — |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 9.0 — better |
| Further details — not scored | ||
| Size | 69 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | David Mills | Micro WS-KLT s.r.o. |
Bugs and requests
Ratio Calc!
Reported bugs
5 issues- Cannot adjust tyre sizes in latest version
- Cannot adjust gear ratio in latest version
- Bug on iPad: 'done' button missing after setting pinion/spur
- Removed notes feature in latest update
- Removed ability to save same vehicle twice in latest update
Requested features
13 requests- Add Mod 1 pinions and spurs
- Add support for 1:8 e-buggies
- Reintroduce notes feature
- Reintroduce ability to save same vehicle twice
- Add iCloud backup or import/export feature
Show 8 moreShow fewer
- Add option to attach setup sheets/track data
- Add input for battery used and motor specs
- Add speed chart for comparison
- Allow selection of gear pitch for each car
- Update app to include new kits
- Add more car models
- Divide Asphalt into 1:12 and 1:10 categories
- Add watch app
Driveroom
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Ratio Calc!
- Nice Tip$0.99
- Generous Tip$2.99
- Mega Tip$4.99
Show 1 moreShow fewer
- Insane Tip$9.99
Driveroom
No in-app purchases
Questions
Is Ratio Calc! free?
Is Driveroom free?
Do Ratio Calc! or Driveroom have ads?
Which is updated more often, Ratio Calc! or Driveroom?
Other comparisons
