# Natural Selection Sim vs Co

The clearest difference is rating: Natural Selection Sim at 3.4 against Co's 2.6. Natural Selection Sim also leads on review sentiment (50% vs 8%). Co's advantage is device support (3 vs 1). On price, ratings volume, update cadence and ads there is nothing between them.

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

Natural Selection Sim holds the better App Store score, 3.4 against 2.6. Both are backed by a comparable volume of ratings — 22 and 17 respectively. Written reviews point the same way: 50% of Natural Selection Sim's written reviews are positive against 8% of Co's.

Natural Selection Sim ships an update every 3 months, Co every 4 months. The most recent releases landed on October 26, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Natural Selection Sim | Co |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (22 ratings)](https://appshunter.io/ios/app/natural-selection-sim/id910261072/reviews)** | [2.6 (17 ratings)](https://appshunter.io/ios/app/cowriter-universal/id915105799/reviews) |
| Number of ratings | **22** | 17 |
| Positive reviews | **50.0% of reviews** | 8.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free | Free |
| Size | 128 MB | 45 MB |
| Requires iOS | 10.0 | 10.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Amplify Education, Inc.](https://appshunter.io/developer/433704168) | [Don Johnston Incorporated](https://appshunter.io/developer/674099735) |

## What reviewers say

### Natural Selection Sim

[App page](https://appshunter.io/ios/app/natural-selection-sim/id910261072)

This educational simulation models natural selection processes. It is designed for use with a specific science curriculum and requires a school-provided login and license to function.

**Highlights:** Natural selection simulation, Educational curriculum integration, Requires school login and license, iPad compatible

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Natural Selection Sim free?

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

### Is Co free?

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

### Which has better reviews, Natural Selection Sim or Co?

Natural Selection Sim is rated higher. Natural Selection Sim averages 3.4 out of 5 from 22 ratings, while Co averages 2.6 from 17 ratings.

### Do Natural Selection Sim or Co have ads?

Neither Natural Selection Sim nor Co shows ads.

### Which is updated more often, Natural Selection Sim or Co?

Natural Selection Sim ships an update every 3 months, and Co every 4 months. Most recently, Natural Selection Sim was updated on October 26, 2026 and Co on October 20, 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.*