Co vs Metabolism Sim
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
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.
- Metabolism simulation
- Science curriculum integration
- Requires Amplify login
- School-provided license needed
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
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.
| Parameter | Co | Metabolism Sim |
|---|---|---|
| Price | Free | Free |
| Rating | 2.6 (17 ratings) | 3.2 (71 ratings) — better |
| Positive reviews | 8.3% of reviews | 57.1% of reviews — better |
| Number of ratings | 17 | 71 — better |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 10.0 | 10.0 |
| Further details — not scored | ||
| Size | 45 MB | 132 MB |
| Age rating | 4+ | 4+ |
| Developer | Don Johnston Incorporated | Amplify Education, Inc. |
Customer experience
Co
Metabolism Sim
In-app purchases
Co
No in-app purchases
Metabolism Sim
No in-app purchases








