Comparison

CozyKey Pro vs SumKey

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
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

SumKey

Features
Read full description

Need to do quick math while typing? Stop app-switching. SumKey puts a calculator inside your keyboard: type an expression anywhere (Notes, chats, email) and tap "=" to get the answer, or long-press "=" to keep just the result. Split a bill, quote a price, check a discount: wherever numbers come up, finish the math right there. KEY FEATURES ● Calculate as you type: tap "=" after any expression and the answer appears inline; long-press "=" to keep just the result ● Percent math the way you think: 4500 - 15% gives the discounted amount instantly ● History inside the keyboard: tap to re-insert a previous result or the whole expression; clearing always asks for confirmation ● Customizable toolbar: clear, cursor keys, forward delete, dismiss keyboard. Add, remove, and reorder freely, or create one-tap custom text keys ● Rearrangeable keys: swap the operator column and function keys; the spare key slot can be ( ), 00, 0.00 and more ● f(x) panel for advanced functions: √, x², x^y, sin/cos/tan, ln, log, π and more ● Every calculation rule is a setting: 0–8 decimal places, rounding mode, thousands separators, implicit multiplication, auto-closing parentheses, operator spacing ● Home Screen widget: calculate on your Home Screen (iOS 17+), sharing the keyboard's settings ● Make it yours: light and dark themes that follow the system, 8 accent colors, and your choice of a black or white app icon ● Localized in English, Traditional Chinese, Japanese, and Simplified Chinese PRIVACY: WE CAN'T SEE WHAT YOU TYPE SumKey never asks for Full Access. That is a system-level guarantee: we cannot see, store, or upload anything you type. The keyboard cannot connect to the internet, contains no analytics or tracking, and works fully offline. Your calculation history stays on your device only. ONE-TIME PURCHASE Pay once, own everything. No subscription, no ads, no account, no in-app purchases. SUPPORT Questions or ideas? Email doka.software@gmail.com

Screenshots

CozyKey Pro4 screens
SumKey4 screens

Verdict

The call

The clearest difference is in-app purchases: SumKey at none against CozyKey Pro's 10. SumKey also leads on update cadence (every 9 days vs every 4 months) and price ($1.99 vs $2.99). CozyKey Pro's advantage is iOS requirement (11.1 vs 16.0). On ads 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 SumKey $1.99 up front. CozyKey Pro sells 10 one-off in-app purchases. SumKey asks for nothing beyond the download.

UpkeepUpdate frequency

CozyKey Pro ships an update every 4 months, SumKey every 9 days. The most recent releases landed on November 6, 2026 and November 10, 2026 respectively.

Scorecard4 real differences · 6 level
CozyKey Pro versus SumKey: the parameters behind the verdict, then further details
ParameterCozyKey ProSumKey
Price$2.99$1.99 — better
Rating4.2 (102 ratings) — better—
Positive reviews76.6% of reviews—
Number of ratings102 — better—
Update frequencyEvery 4 monthsEvery 9 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad
Requires iOS11.1 — better16.0
Further details — not scored
Size24 MB2 MB
Age rating4+4+
DeveloperTIAN-KAI CHANGChe Wei Li

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

SumKey

Not enough reviews yet to summarise bugs or requests.

In-app purchases

10 purchases

CozyKey Pro

One-time10
  • Pink ThemeFree
  • Gold ThemeFree
  • Neon Green Theme$0.99
Show 7 more
  • Neon Peach Theme$0.99
  • Premium Red Theme$0.99
  • Premium Black Theme$0.99
  • Classic Theme Bundle$1.99
  • Fancy Theme Bundle$1.99
  • Neon Theme Bundle$1.99
  • Premium Theme Bundle$1.99
None

SumKey

No in-app purchases

Questions

Is CozyKey Pro free?
CozyKey Pro costs $2.99, and also offers in-app purchases.
Is SumKey free?
SumKey costs $1.99, with no in-app purchases.
Do CozyKey Pro or SumKey have ads?
Neither CozyKey Pro nor SumKey shows ads.
Which is updated more often, CozyKey Pro or SumKey?
CozyKey Pro ships an update every 4 months, and SumKey every 9 days. Most recently, CozyKey Pro was updated on November 6, 2026 and SumKey on November 10, 2026.

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