# Co vs Stickleback Evolution Lab

Co and Stickleback Evolution Lab both sit at 2.6 stars, but that hides the real split: 100% of Stickleback Evolution Lab's written reviews are positive against 8% of Co's. Stickleback Evolution Lab also leads on iOS requirement (8.0 vs 10.0). Co's advantage is update cadence (every 4 months vs every 28 months) and device support (3 vs 1). On price, rating, ratings volume 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.

On the App Store both sit at effectively the same score — 2.6 for Co against 2.6 for Stickleback Evolution Lab. Both are backed by a comparable volume of ratings — 17 and 8 respectively. Written reviews are what separate them: 8% of Co's written reviews are positive against 100% of Stickleback Evolution Lab's.

Co ships an update every 4 months, Stickleback Evolution Lab every 28 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | Co | Stickleback Evolution Lab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.6 (17 ratings)](https://appshunter.io/ios/app/cowriter-universal/id915105799/reviews)** | [2.6 (8 ratings)](https://appshunter.io/ios/app/stickleback-evolution-lab/id938339250/reviews) |
| Number of ratings | **17** | 8 |
| Positive reviews | 8.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 28 months |
| Monetization | Free | Free |
| Size | 45 MB | 264 MB |
| Requires iOS | 10.0 | **8.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Don Johnston Incorporated](https://appshunter.io/developer/674099735) | [Howard Hughes Medical Institute](https://appshunter.io/developer/411540290) |

## 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


### Stickleback Evolution Lab

[App page](https://appshunter.io/ios/app/stickleback-evolution-lab/id938339250)

Explore the science of evolution by analyzing the pelvic structures of threespine stickleback fish. This virtual lab offers three experiments using real fish specimens and fossils, complete with graphing and statistical analysis tools for drawing conclusions about population evolution.

**Highlights:** Analyze pelvic structures of threespine stickleback fish, Conduct experiments with living specimens and fossils, Collect and analyze biological data, Graphing and statistical analysis tools, Learn about evolutionary science

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Co free?

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

### Is Stickleback Evolution Lab free?

Stickleback Evolution Lab is free to download, with no in-app purchases.

### Which has better reviews, Co or Stickleback Evolution Lab?

Co is rated higher. Co averages 2.6 out of 5 from 17 ratings, while Stickleback Evolution Lab averages 2.6 from 8 ratings.

### Do Co or Stickleback Evolution Lab have ads?

Neither Co nor Stickleback Evolution Lab shows ads.

### Which is updated more often, Co or Stickleback Evolution Lab?

Co ships an update every 4 months, and Stickleback Evolution Lab every 28 months. Most recently, Co was updated on November 1, 2026 and Stickleback Evolution Lab on November 1, 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.*