# Ratio Calc! vs RC Maintenance Timer

The clearest difference is price: RC Maintenance Timer at Free against Ratio Calc!'s $2.99. RC Maintenance Timer also leads on update cadence (every 2 weeks vs every 3 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

RC Maintenance Timer is free to download; Ratio Calc! costs $2.99 up front. Ratio Calc! sells 4 one-off in-app purchases and RC Maintenance Timer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Ratio Calc! ships an update every 3 months, RC Maintenance Timer every 2 weeks. The most recent releases landed on September 25, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Ratio Calc! | RC Maintenance Timer |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.5 (25 ratings)](https://appshunter.io/ios/app/ratio-calc/id436311293/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 87.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 46 MB | 47 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [David Mills](https://appshunter.io/developer/395985551) | [Degree3, Inc.](https://appshunter.io/developer/1497876563) |

## 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 |


### RC Maintenance Timer

[App page](https://appshunter.io/ios/app/rc-maintenance-timer/id6743524344)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Backer | $4.99 | one-time |


## Frequently asked questions

### Is Ratio Calc! free?

Ratio Calc! costs $2.99, and also offers in-app purchases.

### Is RC Maintenance Timer free?

RC Maintenance Timer is free to download, with in-app purchases available.

### Do Ratio Calc! or RC Maintenance Timer have ads?

Neither Ratio Calc! nor RC Maintenance Timer shows ads.

### Which is updated more often, Ratio Calc! or RC Maintenance Timer?

Ratio Calc! ships an update every 3 months, and RC Maintenance Timer every 2 weeks. Most recently, Ratio Calc! was updated on September 25, 2026 and RC Maintenance Timer on September 23, 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.*