Comparison

ReplyLens vs Letterly AI

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

Head to head
About

ReplyLens

Features
Read full description

ReplyLens helps you write clear, polished replies faster. Paste the message you want to respond to, choose a tone, and generate a reply you can review, edit, and copy. ReplyLens is useful for casual chats, work messages, emails, marketplace conversations, and everyday communication. Key features: • Generate AI-powered reply suggestions • Adjust tone for different situations • Review and edit before using • Copy responses quickly • Simple, focused interface ReplyLens does not send messages on your behalf. You stay in control of what you copy, edit, and send.

About

Letterly AI

Features
Read full description

Letterly AI is an AI-powered writing assistant that helps you rewrite text into the perfect tone for any situation. Whether you're writing business emails, Japanese Keigo, chat messages, social media posts, or multilingual content, Letterly AI makes your writing natural, professional, and easy to understand. ### Key Features • Rewrite text into polite, business, casual, or friendly tones • Convert Japanese into natural Keigo • Improve grammar, clarity, and readability • Generate and refine business emails • Translate and rewrite content in multiple languages • Create natural responses for chats and messaging apps ### Perfect For • Business professionals • Students • Japanese language learners • Customer support teams • Sales representatives • Freelancers • Anyone who wants to communicate more effectively ### Use Letterly AI For • Business emails • LINE messages • Slack conversations • Social media posts • Daily communication • Multilingual writing Write naturally. Communicate confidently. Express yourself with Letterly AI.

Screenshots

ReplyLens4 screens
Letterly AI3 screens

Verdict

The call

The clearest difference is iOS requirement: Letterly AI at 15.1 against ReplyLens's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Scorecard1 real difference Ā· 5 level
ReplyLens versus Letterly AI: the parameters behind the verdict, then further details
ParameterReplyLensLetterly AI
PriceFreeFree
Update frequency—Every 2 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size3 MB20 MB
Age rating4+4+
DeveloperZiyi WangYing Liu

In-app purchases

None

ReplyLens

No in-app purchases

None

Letterly AI

No in-app purchases

Questions

Is ReplyLens free?
ReplyLens is free to download, with no in-app purchases.
Is Letterly AI free?
Letterly AI is free to download, with no in-app purchases.
Do ReplyLens or Letterly AI have ads?
Neither ReplyLens nor Letterly AI shows ads.

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