Comparison

Keyboard Translator vs RulerApp

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

Head to head
About

Keyboard Translator

This custom keyboard translates text as you type, directly within any app. It offers AI-powered reply drafting and photo translation, all while working completely offline and prioritizing user privacy. Ideal for seamless cross-language communication and travel.

Highlights
  • Real-time text translation as you type
  • AI-powered reply drafting
  • Translate text from photos
  • Fully offline functionality
  • Works within any app
  • Privacy-focused on-device processing
Features
Read full description

KeyPad is a custom iOS keyboard that translates your text as you type - in Messages, Mail, Safari, WhatsApp, Notes, or anywhere else you can type. No copy-paste. No switching apps. No internet connection required. Powered by Apple’s on-device Translation framework, KeyPad runs every translation locally on your iPhone. Your words never touch a server. HOW IT WORKS Type naturally in your language See the live translation above the keys as you type Tap the orange Translate key to replace your text with the translation Send your message - that’s it AI REPLY — NEW Copy any message, then tap the sparkles key KeyPad drafts a reply on-device in the tone you choose - Smart, Flirty, or Recommended Add a little context and it tailors the reply to the conversation Tap Insert to drop it straight into the chat Runs entirely on-device. Requires iOS 26 and Apple Intelligence. TRANSLATE FROM PHOTOS — NEW Share a photo of a sign, menu, or screenshot to KeyPad On-device text recognition reads the words, then translates them. Built for travel - still 100% offline WHY KEYPAD FULLY OFFLINE. Works on airplanes, on the subway, abroad without data. PRIVATE BY DESIGN. Zero network calls from the keyboard. Nothing is logged, nothing is sent. WORKS IN EVERY APP. Not a sandboxed translator you copy-paste out of. The keyboard goes where you go. NATIVE FEEL. Pixel-matched to the iOS system keyboard. Same key sizes, same haptics, same muscle memory. LIVE PREVIEW. See the translation appear as you type, with a 300ms live update. MORE LANGUAGES. Native layouts for QWERTY, QWERTZ, and AZERTY, plus Korean (Hangul) and Japanese (Romaji to Hiragana). Long-press any key for accented characters. SMART AUTOCORRECT. A system-style suggestion bar with inline typo correction when you type in English. INSTANT LANGUAGE SWAP. Tap the language pair above the keys to change source or target without leaving your app. LOCAL HISTORY. Your last 100 translations stay on your device. PERFECT FOR Texting friends or family in a different language Replying to emails from international clients Chatting on WhatsApp with someone abroad Travel, without worrying about roaming data Translating signs, menus, and screenshots on the go Language learners who want to write, not just read PRIVACY YOU CAN VERIFY Full Access is required only to enable Apple’s on-device Translation framework. KeyPad never logs your keystrokes, never sends them anywhere, and makes zero network calls from the keyboard itself. Translations happen entirely on your device using Apple’s private Translation daemon. Your language preferences and translation history are stored locally - never synced, never uploaded. REQUIREMENTS iOS 18 or later (AI Reply requires iOS 26 and Apple Intelligence) iPhone with A12 Bionic chip or newer Language packs downloaded on first use (one-time, offline afterward) GETTING STARTED 1. Install KeyPad and complete the quick setup 2. Choose your languages and download the pack 3. Enable the keyboard in Settings, General, Keyboards 4. Grant Full Access (required for Apple’s Translation bridge) 5. Switch to KeyPad with the globe key in any app and start typing KeyPad is free to use, with daily limits on translations and AI replies. KeyPad Pro unlocks unlimited translations, unlimited AI replies, photo translation, and additional language packs. KeyPad Pro is an auto-renewable subscription: Monthly: $2.99/month (auto-renews until cancelled in your Apple ID Settings) Lifetime: $14.99 (one-time, non-renewing) Payment is charged to your Apple ID at confirmation. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in Settings, Apple Account, Subscriptions. Privacy Policy: https://keypad.rovalapps.com/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Made by Roval Apps. Questions or feedback? Email romano@rovalapps.com

About

RulerApp

Features
Read full description

Turn your iPhone or iPad into a precise on-screen ruler. Hold any small object against the screen and read its exact size — no tape measure, no guesswork. FEATURES • Accurate out of the box — no manual calibration. Ruler scale is calculated from your exact device's screen density. • Switch between centimeters, inches, or both at once. • Drag to drop a crosshair anywhere and read precise X/Y measurements from the corner. • Toggle a grid overlay (off, major lines, or major + minor) for finer alignment. • iPad extras: hover measurements with a trackpad or Apple Pencil, and keyboard shortcuts (U for units, G for grid) with a hardware keyboard. Simple, fast, and always in your pocket.

Screenshots

Keyboard Translator4 screens
RulerApp3 screens

Verdict

The call

The clearest difference is in-app purchases: RulerApp at none against Keyboard Translator's 3. RulerApp also leads on iOS requirement (16.0 vs 18.0). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Keyboard Translator sells 3 in-app purchases, starting at $2.99 per month. RulerApp asks for nothing beyond the download.

Scorecard2 real differences · 8 level
Keyboard Translator versus RulerApp: the parameters behind the verdict, then further details
ParameterKeyboard TranslatorRulerApp
PriceFreeFree
Rating4.3 (9 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings9 — better—
Update frequencyEvery 9 days—
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS18.016.0 — better
Further details — not scored
Size16 MB4 MB
Age rating4+4+
DeveloperRoval Apps Inc.Mathieu Rancourt

In-app purchases

3 purchases

Keyboard Translator

Subscriptions2
  • KeyPad Pro Monthly$2.991 Month
  • KeyPad Pro Annual7 Days trial$14.991 Year
One-time1
  • KeyPad Pro Lifetime$24.99
None

RulerApp

No in-app purchases

Questions

Is Keyboard Translator free?
Keyboard Translator is free to download, with in-app purchases available.
Is RulerApp free?
RulerApp is free to download, with no in-app purchases.
Do Keyboard Translator or RulerApp have ads?
Neither Keyboard Translator nor RulerApp shows ads.

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