# Co vs Metabolism Sim

The clearest difference is review sentiment: Metabolism Sim at 57% against Co's 8%. Metabolism Sim also leads on rating (3.2 vs 2.6) and ratings volume (71 vs 17). Co's advantage is device support (3 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Metabolism Sim holds the better App Store score, 3.2 against 2.6. Both are backed by a comparable volume of ratings — 17 and 71 respectively. Written reviews point the same way: 8% of Co's written reviews are positive against 57% of Metabolism Sim's.

Co ships an update every 4 months, Metabolism Sim every 3 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Co | Metabolism Sim |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (17 ratings)](https://appshunter.io/ios/app/cowriter-universal/id915105799/reviews) | **[3.2 (71 ratings)](https://appshunter.io/ios/app/metabolism-sim/id992862964/reviews)** |
| Number of ratings | 17 | **71** |
| Positive reviews | 8.3% of reviews | **57.1% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 45 MB | 132 MB |
| Requires iOS | 10.0 | 10.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Don Johnston Incorporated](https://appshunter.io/developer/674099735) | [Amplify Education, Inc.](https://appshunter.io/developer/433704168) |

## What reviewers say

### Co

[App page](https://appshunter.io/ios/app/cowriter-universal/id915105799)

This app provides advanced word prediction and spelling support for students. It offers grammar-smart suggestions and access to millions of topic-specific dictionaries to aid in writing. Built-in text-to-speech functionality helps users review their work.

**Highlights:** Grammar-smart word prediction, Millions of topic-specific dictionaries, Flexspell™ technology for spelling errors, Built-in text-to-speech, Personalized vocabulary and settings

**Features:** macOS Compatibility

**In-app purchases:** none


### Metabolism Sim

[App page](https://appshunter.io/ios/app/metabolism-sim/id992862964)

This application simulates human metabolism, designed to complement a science curriculum. It requires a valid Amplify login and license provided by a school to function.

**Highlights:** Metabolism simulation, Science curriculum integration, Requires Amplify login, School-provided license needed

**In-app purchases:** none


## Frequently asked questions

### Is Co free?

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

### Is Metabolism Sim free?

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

### Which has better reviews, Co or Metabolism Sim?

Metabolism Sim is rated higher. Co averages 2.6 out of 5 from 17 ratings, while Metabolism Sim averages 3.2 from 71 ratings.

### Do Co or Metabolism Sim have ads?

Neither Co nor Metabolism Sim shows ads.

### Which is updated more often, Co or Metabolism Sim?

Co ships an update every 4 months, and Metabolism Sim every 3 months. Most recently, Co was updated on November 1, 2026 and Metabolism Sim on November 6, 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.*