Comparison

Co vs Metabolism Sim

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

Metabolism Sim

This application simulates human metabolism, designed to complement a science curriculum. It requires a valid Amplify login and license provided by a school to function.

Highlights
  • Metabolism simulation
  • Science curriculum integration
  • Requires Amplify login
  • School-provided license needed
Read full description

A simulation of metabolism, for use with Amplify's science curriculum. ************************************************************** Metabolism 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. **************************************************************

Screenshots

Co4 screens

Verdict

The call

The clearest difference is review sentiment: Metabolism Sim at 57% against Co's 8%. Metabolism Sim also leads on rating (3.2 vs 2.6) and ratings volume (71 vs 17). Co's advantage is device support (3 vs 1). On price, update cadence, ads and in-app purchases 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

Metabolism Sim holds the better App Store score, 3.2 against 2.6. Both are backed by a comparable volume of ratings — 17 and 71 respectively. Written reviews point the same way: 8% of Co's written reviews are positive against 57% of Metabolism Sim's.

UpkeepUpdate frequency

Co ships an update every 4 months, Metabolism Sim every 3 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

Scorecard4 real differences · 6 level
Co versus Metabolism Sim: the parameters behind the verdict, then further details
ParameterCoMetabolism Sim
PriceFreeFree
Rating2.6 (17 ratings)3.2 (71 ratings) — better
Positive reviews8.3% of reviews57.1% of reviews — better
Number of ratings1771 — better
Update frequencyEvery 4 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS10.010.0
Further details — not scored
Size45 MB132 MB
Age rating4+4+
DeveloperDon Johnston IncorporatedAmplify Education, Inc.

Customer experience

Co

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

Metabolism Sim

All ratings69 ratings
Positive52.2%
Neutral2.9%
Negative44.9%
Written reviews21 reviews
Positive57.1%
Neutral4.8%
Negative38.1%

In-app purchases

None

Co

No in-app purchases

None

Metabolism Sim

No in-app purchases

Questions

Is Co free?
Co is free to download, with no in-app purchases.
Is Metabolism Sim free?
Metabolism Sim is free to download, with no in-app purchases.
Which has better reviews, Co or Metabolism Sim?
Metabolism Sim is rated higher. Co averages 2.6 out of 5 from 17 ratings, while Metabolism Sim averages 3.2 from 71 ratings.
Do Co or Metabolism Sim have ads?
Neither Co nor Metabolism Sim shows ads.
Which is updated more often, Co or Metabolism Sim?
Co ships an update every 4 months, and Metabolism Sim every 3 months. Most recently, Co was updated on November 1, 2026 and Metabolism Sim on November 6, 2026.

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