MergeKey vs NuKey
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MergeKey
This keyboard dynamically adjusts key sizes and visibility as you type, offering larger tap targets and fewer errors. It supports 20 languages and includes customizable styles and privacy-focused features.
- Dynamic key resizing
- Hides impossible keys
- Supports 20 languages
- Customizable styles
- Privacy-focused
- Typing game
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MergeKey — the first keyboard that hides the keys you don't need. As you type, MergeKey dynamically removes impossible letters and expands the remaining keys, giving you bigger tap targets and fewer typos. It's like autocomplete, but visual — you see your options shrink in real time. MERGE MODE — UNIQUE TO MERGEKEY - Keys that can't continue your word disappear instantly - Remaining keys grow to fill the space — bigger keys, fewer mistakes - Learns new words you teach it - Toggle Merge Mode off if you prefer just the disappearing keys without resizing MADE FOR IPAD - Full-size layouts on large iPads, a roomier compact layout on smaller ones - Pinch to split the keyboard for thumb typing, with adjustable split distance - Two-finger trackpad: drag across the keys to move the cursor - Letters Only mode for a clean, focused board - Split typing on iPhone too, in landscape 30 LANGUAGES English, German, French, Spanish, Italian, Portuguese, Dutch, Polish, Czech, Slovenian, Greek, Turkish, Bulgarian, Russian, Ukrainian, Indonesian, Vietnamese, Swedish, Finnish, Danish, Norwegian, Icelandic, Lithuanian, Romanian, Hungarian, Irish, Hebrew, Arabic, Bangla and Hindi — each with native prediction and accented character variants. English (US/GB), Spanish (ES/MX) and Portuguese (BR/PT) with correct regional dictionaries. SMART FEATURES - Quick Settings right in the keyboard — tap the MergeKey icon - Scrolling prediction bar with up to 9 word suggestions - Long-press for accented letters and symbols - Character preview bubble on key tap - Optional dedicated number row - Double-tap shift for caps lock - Backspace hold-to-accelerate (characters, then words) CUSTOMIZABLE STYLE - 5 keyboard styles: Default, Liquid Glass (iOS 26), Classic, Flat and sculpted Keycaps - Custom key fill, border, character and accent colors - Letters that grow with their keys as they merge (optional) - 6 key fonts - Keyboard height: Compact, Normal or Tall - Transparency slider for key fill opacity - Animation speed control - Live keyboard preview in Settings and Style BUILT FOR LEARNERS - Swipe up to teach MergeKey a new word - Swipe down for continuous mode (all keys visible) - Swipe left to delete whole words - Swipe right to repeat the last word - Key heatmap per language shows which letters you type most and where your thumb lands - Built-in typing game to practice in any language PRIVACY FIRST MergeKey does not collect or transmit your typing data. Everything stays on your device. MergeKey never connects to the internet. The only network activity is the App Store handling the optional tips – that's why iOS shows a Mobile Data switch for MergeKey. Word lists based on the Leipzig Corpora Collection (CC BY 4.0).
NuKey
Create a personalized typing experience with custom colors, key styles, and animated lighting. Choose from a variety of mechanical switch sounds to enhance your typing feel. Save and share your unique keyboard designs.
- Custom keyboard designs
- Ready-made themes
- Animated lighting effects
- Mechanical switch sounds
- Personalized key legends
- Emoji browsing
- Shareable designs via QR codes
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NuKey transforms your iPhone keyboard into a personalised typing experience that looks, sounds and feels like your own. Create a custom keyboard by choosing colours, key styles, legends and animated lighting effects. Add satisfying mechanical switch sounds inspired by popular switch types, then preview your creation before you start typing. Features include: • Build and save custom keyboard designs • Choose from ready-made themes • Add animated keyboard lighting effects • Enjoy a collection of mechanical switch sounds • Personalise key legends and layouts • Browse and type emoji with ease • Add your own words for a more personal typing experience • Select your preferred keyboard language • Share keyboard designs using QR codes • Preview sounds and themes inside the app Whether you prefer a clean, understated keyboard or something colourful and expressive, NuKey gives you the tools to make every tap your own. Some themes, sounds and customisation features may require NuKey Pro.
Screenshots
Verdict
The clearest difference is rating: MergeKey at 5.0 against NuKey's 4.5. MergeKey also leads on in-app purchases (none vs 4) and review sentiment (100% vs 70%). NuKey's advantage is update cadence (daily vs weekly) and ratings volume (40 vs 2). On price, 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
Both are free to download. NuKey sells 4 one-off in-app purchases. MergeKey asks for nothing beyond the download.
MergeKey holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: NuKey has 40 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of MergeKey's written reviews are positive against 70% of NuKey's.
MergeKey ships an update weekly, NuKey daily. The most recent releases landed on October 4, 2026 and October 13, 2026 respectively.
| Parameter | MergeKey | NuKey |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.5 (40 ratings) |
| Positive reviews | 100.0% of reviews — better | 70.4% of reviews |
| Number of ratings | 2 | 40 — better |
| Update frequency | Weekly | Daily — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 64 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrei Achziger | Sean Kelly |
Customer experience
MergeKey
NuKey
In-app purchases
MergeKey
No in-app purchases
NuKey
- Nice One$1.99
- Very Kind$4.99
- NuKey Pro$8.99
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- Legend$9.99









