Co vs Math Rocket
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
Read full descriptionHide 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
Math Rocket
This app challenges your brain with simple math problems to boost processing speed. It requires quick recognition of numbers and performing calculations using addition, subtraction, multiplication, and division. Regular play can improve quantitative skills and attention span.
- Increases brain processing speed
- Trains recognition speed
- Develops quantitative skills
- Enhances attention span
- Includes all four operators (+, -, x, ÷)
- Progressively challenging levels
Read full descriptionHide full description
Math Rocket increases your brain processing speed with simple math questions. The big number you see is composed of either the middle and the left number, or the middle and the right number. Check out the screenshot for an example – it's actually fun! Math Rocket trains three key areas: • Recognition speed • Quantitative skills • Attention span You quickly need to recognize all four numbers on the screen. Then you need to perform the appropriate calculation and tap on the correct side of the screen. Math Rocket includes all four operators: • Addition (+) • Subtraction (−) • Multiplication (x) • Division (÷) The further you progress in the game, the higher will be the numbers! Download Math Rocket today and play it regularly, we guarantee that you'll quickly improve!
Screenshots
Verdict
The clearest difference is rating: Math Rocket at 3.6 against Co's 2.6. Math Rocket also leads on review sentiment (28% vs 8%) and ratings volume (132 vs 17). Co's advantage is iOS requirement (10.0 vs 12.0). 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.
Math Rocket holds the better App Store score, 3.6 against 2.6. That said, the two scores are not equally well evidenced: Math Rocket has 132 ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 8% of Co's written reviews are positive against 28% of Math Rocket's.
Co ships an update every 4 months, Math Rocket every 9 months. The most recent releases landed on October 29, 2026 and November 2, 2026 respectively.
| Parameter | Co | Math Rocket |
|---|---|---|
| Price | Free | Free |
| Rating | 2.6 (17 ratings) | 3.6 (132 ratings) — better |
| Positive reviews | 8.3% of reviews | 27.8% of reviews — better |
| Number of ratings | 17 | 132 — better |
| Update frequency | Every 4 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 10.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 45 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Don Johnston Incorporated | Erik Wegener |
Customer experience
Co
Math Rocket
In-app purchases
Co
No in-app purchases
Math Rocket
No in-app purchases









