# Ratio Calc! vs LapMonitor

The clearest difference is rating: LapMonitor at 5.0 against Ratio Calc!'s 4.5. LapMonitor also leads on in-app purchases (none vs 4) and review sentiment (100% vs 88%). Ratio Calc!'s advantage is update cadence (every 4 months vs every 9 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Ratio Calc! sells 4 one-off in-app purchases. LapMonitor asks for nothing beyond the download.

LapMonitor holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 25 and 13 respectively. Written reviews point the same way: 88% of Ratio Calc!'s written reviews are positive against 100% of LapMonitor's.

Ratio Calc! ships an update every 4 months, LapMonitor every 9 months. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Ratio Calc! | LapMonitor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (25 ratings)](https://appshunter.io/ios/app/ratio-calc/id436311293/reviews) | **[5.0 (13 ratings)](https://appshunter.io/ios/app/lapmonitor/id1210499975/reviews)** |
| Number of ratings | **25** | 13 |
| Positive reviews | 87.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 69 MB | 17 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [David Mills](https://appshunter.io/developer/395985551) | [GY FX](https://appshunter.io/developer/1210499974) |

## What reviewers say

### Ratio Calc!

[App page](https://appshunter.io/ios/app/ratio-calc/id436311293)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Nice Tip | $0.99 | one-time |
| Generous Tip | $2.99 | one-time |
| Mega Tip | $4.99 | one-time |
| Insane Tip | $9.99 | one-time |

**What reviewers like**

- 👍 Excellent for RC gear ratios
- 👍 Great database of cars
- 👍 Simple and easy to use
- 👍 Invaluable at the track
- 👍 Time saver

**What reviewers complain about**

- 🐛 Latest version unusable
- 🐛 Cannot adjust tyre sizes
- 🐛 Cannot adjust gear ratio
- 🐛 Removed notes feature
- 🐛 Removed ability to save same vehicle twice

**Reported bugs**

- 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**

- 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


### LapMonitor

[App page](https://appshunter.io/ios/app/lapmonitor/id1210499975)

This application pairs with a dedicated device to provide real-time lap timing for RC car races. It supports single or multi-racer configurations, displays live rankings and race data, and announces key events. Race history is automatically saved and can be exported or shared.

**Highlights:** Bluetooth device connection, Multi-driver race configuration, Real-time driver ranking, Speech synthesis for race events, Detailed lap information, Automatic race data saving, Race data export and sharing

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Ratio Calc! free?

Ratio Calc! is free to download, with in-app purchases available.

### Is LapMonitor free?

LapMonitor is free to download, with no in-app purchases.

### Which has better reviews, Ratio Calc! or LapMonitor?

LapMonitor is rated higher. Ratio Calc! averages 4.5 out of 5 from 25 ratings, while LapMonitor averages 5.0 from 13 ratings.

### Do Ratio Calc! or LapMonitor have ads?

Neither Ratio Calc! nor LapMonitor shows ads.

### Which is updated more often, Ratio Calc! or LapMonitor?

Ratio Calc! ships an update every 4 months, and LapMonitor every 9 months. Most recently, Ratio Calc! was updated on October 16, 2026 and LapMonitor on October 7, 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.*