Natural Selection Sim vs Co
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Natural Selection Sim
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.
- Natural selection simulation
- Educational curriculum integration
- Requires school login and license
- iPad compatible
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A simulation of natural selection, for use with Amplify's science curriculum. **************************************************************** Natural Selection Sim WILL ONLY WORK IF YOU HAVE AN AMPLIFY LOGIN AND LICENSE PROVIDED BY A SCHOOL. You can download the app without a login, but you will not be able to use the app without a valid Amplify login. ****************************************************************"
Co
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.
- Grammar-smart word prediction
- Millions of topic-specific dictionaries
- Flexspell™ technology for spelling errors
- Built-in text-to-speech
- Personalized vocabulary and settings
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Co:Writer® Universal app and third-party keyboard gives students easy access to word prediction on iPad, iPad Pro, iPhone, and iPod Touch. Students simply sign in to their Co:Writer Universal accounts to write with their personal settings and vocabulary. ABOUT CO:WRITER UNIVERSAL This version is for schools with a Co:Writer Universal license only. Users without a Co:Writer Universal license must purchase the Co:Writer app. HOW DOES CO:WRITER WORK? As letters are typed, Co:Writer predicts the intended word with a selection of word suggestions using powerful grammar-smart word prediction. These suggestions can be read aloud with a swipe. Selecting the intended word places it into the writing document. For feedback while writing (and after writing) built-in text to speech can be used to read letters, words, sentences, and the entire document. 4+ MILLION TOPIC-SPECIFIC DICTIONARIES Co:Writer has access to a main prediction dictionary (that includes core words) and Topic Dictionaries (that includes topic specific words). Co:Writer can access over 4 million topic-specific dictionaries which are activated based on the writing task. A small sampling of the variety of topic dictionaries: - America's Cup - Apple II - Compare and Contrast - Dinosaurs - Grumpy Cat - History of the Peloponnesian War - Mahatma Gandhi - My Dog - Pig Latin - Rolls-Royce Silver Ghost - SpongeBob SquarePants - Tommy (album) - Wonders of the World SPELLING SUPPORT Co:Writer handles the widest range of spelling mistakes through its Flexspell™technology including phonetic spelling and inventive spelling errors (letter omissions, word ending omissions, letter reversals, etc). Examples of how Co:Writer aides with phonetic and/or inventive spelling: Before Co:Writer The blk jargon flu over the bra lfnt. R u hpy to ce me? I no hw to nor the fone. After Co:Writer The black dragon flew over the gray elephant. Are you happy to see me? I know how to answer the phone. GRAMMAR SUPPORT Co:Writer bases its prediction off of proper grammar, and uses its understanding of grammar to accurately predict words within the framework of valid sentence structures. Examples of how Co:Writer aides with grammar: Dogs are furry. (noun, verb, adj.) - When you typed d-o, you get plural noun choices Three very mangy dogs ran down the street. (adj., adv., adj., noun, verb… etc.) - After typing three, very, mangy, you get plural noun choices, then you get plural verb tenses. OTHER FEATURES - Built-in Text to Speech - Export
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Natural Selection Sim | Co |
|---|---|---|
| Price | Free | Free |
| Rating | 3.4 (22 ratings) — better | 2.6 (17 ratings) |
| Positive reviews | 50.0% of reviews — better | 8.3% of reviews |
| Number of ratings | 22 — better | 17 |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 10.0 | 10.0 |
| Further details — not scored | ||
| Size | 128 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Amplify Education, Inc. | Don Johnston Incorporated |
Customer experience
Natural Selection Sim
Co
In-app purchases
Natural Selection Sim
No in-app purchases
Co
No in-app purchases
Questions
Is Natural Selection Sim free?
Is Co free?
Which has better reviews, Natural Selection Sim or Co?
Do Natural Selection Sim or Co have ads?
Which is updated more often, Natural Selection Sim or Co?
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