Comparison

OnKey vs Reader AI

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

Head to head
About

OnKey

Enhance your writing with AI directly from your keyboard. Instantly fix grammar, adjust tone, translate messages, and generate complete emails or replies in seconds. Works across all your favorite messaging and email apps.

Highlights
  • AI-powered writing assistance
  • Instant tone transformation (16 tones)
  • Generate complete emails and replies
  • Real-time translation (100+ languages)
  • Flawless grammar correction (19 languages)
  • Works across all apps
Features
Read full description

Stop wasting hours writing emails. OnKey brings the smartest AI directly to your keyboard. Professionals save 5+ hours per week with OnKey. Here's why they upgrade to Premium: THE PROBLEM You spend too much time: • Fixing grammar mistakes • Rewriting messages to sound professional • Translating for international colleagues • Staring at blank screens, unsure what to write THE SOLUTION OnKey does it all - right from your keyboard. No copy-paste. No switching apps. INSTANT TONE TRANSFORMATION One tap. 16 tones. Perfect message. → Professional: Impress your boss → Friendly: Connect with clients → Confident: Close the deal → Academic: Ace your papers → Casual, Funny, Romantic, and 10 more "I changed a frustrated complaint into a professional request in 2 seconds." - Premium user WRITE COMPLETE EMAILS IN SECONDS Describe what you need. OnKey writes it. • "Reschedule tomorrow's meeting to Friday" • "Follow up on unpaid invoice, firm but polite" • "Thank them for the interview, express interest" Done. Sent. Move on with your day. SMART REPLIES See a message? Tap to reply: • Agree • Disagree • Ask to Clarify • Thank You • Follow Up • Schedule Meeting No more overthinking responses. TRANSLATE AS YOU TYPE 100+ languages. Type in yours. Send in theirs. Break every language barrier without leaving your conversation. FLAWLESS GRAMMAR 19 languages supported. Every message polished. OnKey catches what autocorrect misses. WHY PROFESSIONALS CHOOSE PREMIUM • Unlimited access to our smartest AI models • No daily limits • Priority processing • All 16 tones unlocked WORKS EVERYWHERE iMessage, WhatsApp, Gmail, Slack, LinkedIn, Outlook - every app where you type. THE BOTTOM LINE Free users get a taste. Premium users get results. Your writing represents you. Make every word count. Download OnKey. Write smarter. Save hours. - Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://keyboard.hopin.it/documents/privacy_policy.pdf

About

Reader AI

Features
Read full description

Reader AI is a focused Markdown reader for offline sources, saved articles, notes, YouTube videos, AI summaries, prompts, and exports. It is built for reading first. Save Markdown, text notes, web articles, YouTube videos, and useful links in one organized library. Read sources in a clean layout with themes, typography controls, font size, and spacing that help you focus. Keep useful material available in a durable workspace instead of losing it in tabs, chats, or one-off AI outputs. When you need help moving faster, Reader AI can turn long sources into clear takeaways, structured notes, transcripts, recommendations, risks, questions, decisions, and custom prompt outputs. Use Reader AI to: • Read Markdown, notes, articles, and saved sources in one focused library • Read offline when sources are available locally • Customize themes, font size, spacing, and reading layout • Save YouTube videos, web articles, Markdown, notes, and text • Stream YouTube transcripts and readable source captures • Summarize long content into clear takeaways • Ask custom prompts to analyze, evaluate, and structure sources • Organize work across workspaces • Choose your default AI output language • Export finished work to PDF, EPUB, email, Kindle, Markdown, or plain text • Sync your library across mobile and web Reader AI is not just a summarizer. It is a better reading workspace: Markdown-friendly, offline-first where it matters, themeable, and ready for AI analysis only when you need it. Use it for: • Markdown reading and personal notes • YouTube talks, lectures, and interviews • Article summaries and news digestion • Research notes and literature review • Study notes and learning workflows • Product, strategy, and market analysis • Briefs, summaries, and decision support • Personal knowledge management Reader AI access includes renewing credits for AI-powered work such as summaries, analysis, prompts, and exports. Optional top-ups are available when you need more. Reader AI is powered by Xevol. Terms: https://xevol.com/terms Privacy Policy: https://xevol.com/privacy

Screenshots

OnKey4 screens
Reader AI4 screens

Verdict

The call

The clearest difference is iOS requirement: Reader AI at 15.0 against OnKey's 18.0. On price, update cadence, ads and in-app purchases 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. OnKey sells 2 in-app purchases, starting at $2.99 per 7 days and Reader AI sells 8 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 18, 2026 and October 2, 2026 respectively.

Scorecard1 real difference · 8 level
OnKey versus Reader AI: the parameters behind the verdict, then further details
ParameterOnKeyReader AI
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 3 weeksEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.015.0 — better
Further details — not scored
Size35 MB15 MB
Age rating9+12+
DeveloperHOPIN IT SP Z O OThinking Systems LLC

In-app purchases

2 purchases

OnKey

Subscriptions2
  • Weekly AI Keyboard3 Days trial$2.997 Days
  • Monthly subscription$6.991 Month
8 purchases

Reader AI

Subscriptions3
  • Reader AI Weekly Access$6.997 Days
  • Reader AI Monthly Access$14.991 Month
  • Reader AI Yearly Access$89.991 Year
One-time5
  • 100 Credits$4.99
  • 300 Credits$7.99
  • 750 Credits$14.99
Show 2 more
  • 500 Credits$19.99
  • 2000 Credits$59.99

Questions

Is OnKey free?
OnKey is free to download, with in-app purchases available.
Is Reader AI free?
Reader AI is free to download, with in-app purchases available.
Do OnKey or Reader AI have ads?
Neither OnKey nor Reader AI shows ads.
Which is updated more often, OnKey or Reader AI?
OnKey ships an update every 3 weeks, and Reader AI every 3 weeks. Most recently, OnKey was updated on October 18, 2026 and Reader AI on October 2, 2026.

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