# Ratio vs Combustion Inc.

The clearest difference is price: Combustion Inc. at Free against Ratio's $4.99. Combustion Inc. also leads on rating (4.7 vs 4.3) and review sentiment (76% vs 49%). Ratio's advantage is chart position (#55 vs unranked) and iOS requirement (10.0 vs 16.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Combustion Inc. is free to download; Ratio costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Combustion Inc. holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: Combustion Inc. has 1.9K ratings behind it against 16, so its average is the more settled of the two. Written reviews point the same way: 49% of Ratio's written reviews are positive against 76% of Combustion Inc.'s.

Ratio ships an update every 2 months, Combustion Inc. every 6 weeks. The most recent releases landed on October 20, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Ratio | Combustion Inc. |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | [4.3 (16 ratings)](https://appshunter.io/ios/app/ratio/id345119718/reviews) | **[4.7 (1.9K ratings)](https://appshunter.io/ios/app/combustion-inc/id1658858290/reviews)** |
| Number of ratings | 16 | **1.9K** |
| Positive reviews | 48.9% of reviews | **76.3% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Paid | **Free** |
| Best chart rank | **#55** | — |
| Size | 7 MB | 119 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ruhlman Enterprises, Inc.](https://appshunter.io/developer/345119721) | [Combustion Inc.](https://appshunter.io/developer/1588334920) |

## What reviewers say

### Ratio

[App page](https://appshunter.io/ios/app/ratio/id345119718)

**Currently charting:** #55 Top Paid · Food & Drink (US App Store)

This app helps you master cooking by understanding fundamental ingredient relationships. It calculates ingredient amounts based on ratios, freeing you from strict recipes and allowing for creative variations. Explore 32 critical culinary ratios with instructions, variations, and tools to store and share your own creations.

**Highlights:** 32 critical culinary ratios, Ingredient amount calculator, Ounces-to-grams converter, Recipe variations and ideas, Store custom recipes and notes, Share creations on social media

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

**In-app purchases:** none


### Combustion Inc.

[App page](https://appshunter.io/ios/app/combustion-inc/id1658858290)

Monitor and graph real-time food temperatures during cooking. Predict exactly when your meal will be ready using advanced sensor data and a predictive engine. Receive alerts for key cooking events and ensure food safety.

**Highlights:** Real-time core, surface, and ambient temperature graphing, Predictive engine for exact 'ready' time estimation, Advanced alerts for cooking events, Food safety parameter setting, Firmware updates for accessories, Cloud connectivity for remote monitoring, Live Activity and Apple Watch support

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Fantastic product
- 👍 Easy to use
- 🔍 Accurate temperature readings
- 💡 Predictive cooking feature
- 🚀 Seamless app experience

**What reviewers complain about**

- 🐛 Connectivity issues
- 🔋 Battery life problems
- 🐛 Unreliable performance
- 🐛 Sync and pairing problems
- 🐛 App bugs and glitches

**Reported bugs**

- Thermometer disconnects during use
- App unable to stop timer
- Inaccurate temperature readings
- App unable to find device
- Firmware update issues

**Requested features**

- Cooking history and logging
- Live status widget
- Apple Watch and Dynamic Island support
- Ambient temperature alerts
- Customizable probe labeling


## Frequently asked questions

### Is Ratio free?

Ratio costs $4.99, with no in-app purchases.

### Is Combustion Inc. free?

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

### Which has better reviews, Ratio or Combustion Inc.?

Combustion Inc. is rated higher. Ratio averages 4.3 out of 5 from 16 ratings, while Combustion Inc. averages 4.7 from 1.9K ratings.

### Do Ratio or Combustion Inc. have ads?

Neither Ratio nor Combustion Inc. shows ads.

### Which is updated more often, Ratio or Combustion Inc.?

Ratio ships an update every 2 months, and Combustion Inc. every 6 weeks. Most recently, Ratio was updated on October 20, 2026 and Combustion Inc. on October 22, 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.*