Comparison

Natural Selection Sim vs Co

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Natural selection simulation
  • Educational curriculum integration
  • Requires school login and license
  • iPad compatible
Read full description

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. ****************************************************************"

About

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.

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
Read full description

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

Co4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Natural Selection Sim versus Co: the parameters behind the verdict, then further details
ParameterNatural Selection SimCo
PriceFreeFree
Rating3.4 (22 ratings) — better2.6 (17 ratings)
Positive reviews50.0% of reviews — better8.3% of reviews
Number of ratings22 — better17
Update frequencyEvery 3 months — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPadiPhone, iPad, iPod — better
Requires iOS10.010.0
Further details — not scored
Size128 MB45 MB
Age rating4+4+
DeveloperAmplify Education, Inc.Don Johnston Incorporated

Customer experience

Natural Selection Sim

All ratings21 ratings
Positive52.4%
Neutral4.8%
Negative42.9%
Written reviews6 reviews
Positive50.0%
Neutral16.7%
Negative33.3%

Co

All ratings17 ratings
Positive29.4%
Neutral23.5%
Negative47.1%
Written reviews12 reviews
Positive8.3%
Neutral16.7%
Negative75.0%

In-app purchases

None

Natural Selection Sim

No in-app purchases

None

Co

No in-app purchases

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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