Comparison

CozyKey Pro vs Custom Formulas

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

Head to head
About

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.

Highlights
  • 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
Currently charting
Read full description

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!"

About

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.

Highlights
  • Multiple input/output formula support
  • Linked formulas via variable names
  • Formula categorization
  • Customizable variable display order
  • Adjustable output decimal precision
  • Email formula sharing
Features
Currently charting
Read full description

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

CozyKey Pro4 screens
Custom Formulas4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard8 real differences · 3 level
CozyKey Pro versus Custom Formulas: the parameters behind the verdict, then further details
ParameterCozyKey ProCustom Formulas
Price$2.99 — better$3.99
Rating4.2 (102 ratings)5.0 (1 ratings) — better
Positive reviews76.6% of reviews100.0% of reviews — better
Number of ratings102 — better1
Update frequencyEvery 4 monthsEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank#199#186 — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS11.1 — better15.4
Further details — not scored
Size24 MB1 MB
Age rating4+4+
DeveloperTIAN-KAI CHANGAnthony Dunk

Customer experience

CozyKey Pro

All ratings102 ratings
Positive78.4%
Neutral11.8%
Negative9.8%
Written reviews64 reviews
Positive76.6%
Neutral9.4%
Negative14.1%

Custom Formulas

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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
Show 2 more
  • Haptic feedback
  • Cheaper full package purchase option

Custom Formulas

Not enough reviews yet to summarise bugs or requests.

In-app purchases

15 purchases

CozyKey Pro

One-time15
  • Pink ThemeFree
  • Gold ThemeFree
  • Classic Silver Theme$0.99
Show 12 more
  • 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
None

Custom Formulas

No in-app purchases

Questions

Is CozyKey Pro free?
CozyKey Pro costs $2.99, and also offers in-app purchases.
Is Custom Formulas free?
Custom Formulas costs $3.99, with no in-app purchases.
Which has better reviews, CozyKey Pro or Custom Formulas?
Custom Formulas is rated higher. CozyKey Pro averages 4.2 out of 5 from 102 ratings, while Custom Formulas averages 5.0 from 1 ratings.
Do CozyKey Pro or Custom Formulas have ads?
Neither CozyKey Pro nor Custom Formulas shows ads.
Which is updated more often, CozyKey Pro or Custom Formulas?
CozyKey Pro ships an update every 4 months, and Custom Formulas every 5 days. Most recently, CozyKey Pro was updated on September 25, 2026 and Custom Formulas on September 18, 2026.
Which is more popular, CozyKey Pro or Custom Formulas?
CozyKey Pro currently peaks at #199 in the App Store charts, and Custom Formulas at #186. Chart position reflects recent download velocity rather than total install base.

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