# PlainPen: AI Writer & Editor — Email Replies & Text Rewriter

> Email Replies & Text Rewriter (iPhone/iPad app by 于川 曹.)

- Source: https://appshunter.io/ios/app/plainpen-ai-writer-and-editor/id6813863790 (this page in markdown: same URL + `.md`)
- Developer: [于川 曹](https://appshunter.io/developer/6793565439)
- Category: Productivity
- Price: Free with in-app purchases
- Age rating: 17+
- Requires: iOS 17.0 · 4 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-10-02
- Data updated: 2026-10-06

## What is PlainPen?

Turn a rough message into a clearer email. Find a reply that sounds like you. Turn your notes into a first draft.

PlainPen is an AI writing assistant for iPhone. Start with your own words or materials, then ask for a shorter, warmer or more professional version. Keep working in the same conversation and review the result before sharing it.

EMAILS AND REPLIES
Draft an email, rewrite a difficult message or prepare a reply from text or a screenshot. Add a follow-up to change the tone, length or audience.

REWRITE WITH CONTROL
Rephrase a sentence or work on a longer draft. The document editor offers suggested changes, comparison, undo and version history, so you can choose what to keep.

START FROM YOUR NOTES
Bring in source material to draft, summarize or translate. Import TXT, Markdown, DOCX, text-based PDF, PPTX and XLSX files. Selected materials are shared with the AI for the task; review extracted text and any references.

MAKE IT SOUND LIKE YOU
Save writing preferences, tone rules and expressions to avoid. These guide the assistant; they are not a guarantee that every suggestion will match your intent.

KEEP YOUR WORK
Revisit conversations and saved documents. Export documents as TXT, Markdown or DOCX. Local document editing and export work offline. AI needs an internet connection; you can try the free AI Chat allowance without signing in. Sign in with Apple is used for subscriptions and a recoverable account.

FREE AND PRO
Start with 20 successfully completed AI replies per UTC calendar month. PlainPen Pro includes 300 per UTC calendar month on either the monthly or yearly plan. Follow-up replies count toward the allowance; background summaries do not use an extra reply. Unused replies do not roll over.

Subscriptions renew automatically unless canceled. The price and billing period shown by Apple apply. Manage or cancel your subscription in your Apple account settings, or use Restore Purchases in the app.

AI requests send the content needed for your task to our service and AI provider after your consent. AI can change details or make mistakes. Check names, dates, amounts and references before using an answer.

Privacy: https://plainpen-api.mapp012-server.workers.dev/privacy.html
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| PlainPen Pro Monthly | $14.99 | per month |
| PlainPen Pro Yearly | $69.99 | per year |


## Is PlainPen safe?

Not enough ratings yet to assess PlainPen.

## Is PlainPen legit?

PlainPen: AI Writer & Editor appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for PlainPen is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-10-02

No release notes.

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All apps by 于川 曹: https://appshunter.io/developer/6793565439

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-06.*