CozyKey Pro vs Custom Formulas
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CozyKey Pro
This keyboard app offers larger keys and a familiar layout for a more comfortable and precise typing experience on iPhones. It prioritizes security by not requiring full access and includes features like a dedicated punctuation keyboard and cursor control.
- Larger keys for comfort
- Familiar keyboard layout
- No full access required for security
- One-handed typing support
- Dedicated punctuation keyboard
- Precise cursor control with arrow keys
- Word prediction and auto-correction
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CozyKey is an innovative keyboard for your iPhone. The unique design provides much bigger keys and a familiar keyboard layout. There is no learning required. With bigger keys, CozyKey provides a remarkably comfortable and precise typing experience. * Secure and security - NO Full Access required. The iOS system ensures that keystrokes cannot be sent to anywhere. * Big keys * Easy to use - Familiar layout * Type with one hand - Keys are still big enough in one handed keyboard especially for big phones. * Key tap animation - Better visual feedback * Thoughtfully crafted punctuation keyboard - Find punctuation marks at a glance. * Beautiful themes (Some themes are available through in-app purchase) * Left/right arrow key - Move cursor precisely with simple action. * Word prediction * Auto-Capitalization * Auto-Correction * Quick Period * Text shortcuts - Make use of Text Replacement in Settings for expanding text like "omw" into "On my way!"
Custom Formulas
This utility app allows users to create and manage complex calculations with multiple inputs and outputs. Formulas can be linked, grouped into categories, and customized for display precision. Share your custom calculations easily via email.
- Multiple input/output formula support
- Linked formulas via variable names
- Formula categorization
- Customizable variable display order
- Adjustable output decimal precision
- Email formula sharing
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This app is easy to use, but unlike simpler apps, multiple entered values can be fed into multiple formulas and multiple output values can be displayed. The output of one formula in a group can be fed into the next by using the same variable name. Related formulas can be grouped into categories to make them easy to find. e.g. Maths formulas, Surveying formulas, Loan interest formulas etc. The order of variables displayed to the user can be changed, as can the number of decimal digits of precision shown in the output fields. You can easily share formulas with other users of the app by emailing them. Three example formulas are pre-installed with the app. In order of increasing complexity they are: slope percentage, compound interest, and point scale factor.
Screenshots
Verdict
The clearest difference is rating: Custom Formulas at 5.0 against CozyKey Pro's 4.2. Custom Formulas also leads on in-app purchases (none vs 15) and update cadence (every 5 days vs every 4 months). CozyKey Pro's advantage is ratings volume (102 vs 1) and price ($2.99 vs $3.99). On ads, chart position and device support 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
CozyKey Pro costs $2.99 and Custom Formulas $3.99 up front. CozyKey Pro sells 15 one-off in-app purchases. Custom Formulas asks for nothing beyond the download.
Custom Formulas holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: CozyKey Pro has 102 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 77% of CozyKey Pro's written reviews are positive against 100% of Custom Formulas's.
CozyKey Pro ships an update every 4 months, Custom Formulas every 5 days. The most recent releases landed on September 25, 2026 and September 18, 2026 respectively.
| Parameter | CozyKey Pro | Custom Formulas |
|---|---|---|
| Price | $2.99 — better | $3.99 |
| Rating | 4.2 (102 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 76.6% of reviews | 100.0% of reviews — better |
| Number of ratings | 102 — better | 1 |
| Update frequency | Every 4 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Best chart rank | #199 | #186 — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 11.1 — better | 15.4 |
| Further details — not scored | ||
| Size | 24 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | TIAN-KAI CHANG | Anthony Dunk |
Customer experience
CozyKey Pro
Custom Formulas
Bugs and requests
CozyKey Pro
Reported bugs
3 issues- Autocorrect prepends extra letters
- Inconsistent key presses (n for space, r for t)
- Apostrophe key placement inconvenient
Requested features
7 requests- Adjustable key size
- Row of number keys at the top
- Option to remove suggestion bar
- Swipe type functionality
- Integration with dark and light mode
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- Haptic feedback
- Cheaper full package purchase option
Custom Formulas
Not enough reviews yet to summarise bugs or requests.
In-app purchases
CozyKey Pro
- Pink ThemeFree
- Gold ThemeFree
- Classic Silver Theme$0.99
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- Neon Green Theme$0.99
- Neon Peach Theme$0.99
- Premium Red Theme$0.99
- Premium Black Theme$0.99
- Classic Rose Gold Theme$0.99
- Premium Blue Theme$0.99
- Neon Orange Theme$0.99
- Fancy Blue Theme$0.99
- Classic Theme Bundle$1.99
- Fancy Theme Bundle$1.99
- Neon Theme Bundle$1.99
- Premium Theme Bundle$1.99
Custom Formulas
No in-app purchases
Questions
Is CozyKey Pro free?
Is Custom Formulas free?
Which has better reviews, CozyKey Pro or Custom Formulas?
Do CozyKey Pro or Custom Formulas have ads?
Which is updated more often, CozyKey Pro or Custom Formulas?
Which is more popular, CozyKey Pro or Custom Formulas?
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