Comparison

Co vs Stickleback Evolution Lab

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

Head to head
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

About

Stickleback Evolution Lab

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
Read full description

The Stickleback Evolution Virtual Lab will introduce you to the science and techniques used to analyze the forms and structures of organisms–in particular, the pelvic structures of the threespine stickleback fish (Gasterosteus aculeatus). The lab includes three experiments in which you will collect data using photographs of living fish specimens and fossils to draw conclusions about the evolution of stickleback fish populations. The lab includes graphing and statistical analysis of biological data. This app is geared to high school and college biology students, and anyone interested in the biological sciences. The Howard Hughes Medical Institute (HHMI) is a nonprofit medical research organization that ranks as one of the nation's largest philanthropies. HHMI plays a powerful role in advancing biomedical research and science education. HHMI brings the latest biomedical research into the classroom with the award-winning BioInteractive website, featuring free resources for science education, including lectures, animations, short films, interactive features, and classroom-ready lesson plans and activities. Topics include all areas of biology and earth and environmental science. Vist the website at www.biointeractive.org.

Screenshots

Co4 screens

Verdict

The call

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.

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

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.

UpkeepUpdate frequency

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

Scorecard4 real differences · 6 level
Co versus Stickleback Evolution Lab: the parameters behind the verdict, then further details
ParameterCoStickleback Evolution Lab
PriceFreeFree
Rating2.6 (17 ratings) — better2.6 (8 ratings)
Positive reviews8.3% of reviews100.0% of reviews — better
Number of ratings17 — better8
Update frequencyEvery 4 months — betterEvery 28 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS10.08.0 — better
Further details — not scored
Size45 MB264 MB
Age rating4+4+
DeveloperDon Johnston IncorporatedHoward Hughes Medical Institute

Customer experience

Co

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

Stickleback Evolution Lab

All ratings8 ratings
Positive37.5%
Neutral0.0%
Negative62.5%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Co

No in-app purchases

None

Stickleback Evolution Lab

No in-app purchases

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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