Privacy AI vs BookWrite
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Privacy AI
This app offers a powerful AI fiction studio for writing novels, an AI character roleplay studio, and the ability to run various AI models locally or remotely. It includes extensive tools for content processing, voice generation, and AI agents, with full accessibility features.
- AI fiction novel writing studio
- AI character roleplay studio
- Run local and remote AI models
- AI agents and 40+ built-in tools
- On-device and cloud voice generation
- Convert and export various file types
- Full VoiceOver and haptic feedback support
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Privacy AI is both a chatbot and an agent, and both run on your device. Ask it a question, or give it a goal and it will plan, use tools, and come back with a report. Local models work fully offline, and nothing leaves your phone unless you connect a cloud provider yourself. Run Models Locally or in the Cloud - On-device GGUF and MLX models, with vision and tool-calling - New on iOS 27: Neural Engine models keep generating after you leave the app - Local Decisions: classify and rate text on device, no text generated - Apple Private Cloud Compute and the on-device Foundation Model, no account or API key - Apple models read attached pictures; models without vision get an on-device description - Connect to OpenAI, Claude, Gemini, DeepSeek, or any OpenAI-compatible server Agent - Give it a goal and it keeps working across as many turns as that takes - It plans first, calls tools, keeps its own folder of files, and delivers a written report - Suited to work that must be broken down: deep research, a multi-leg trip, comparing options - Teach it with Skills: folders of instructions and scripts it can call by name Chat - Set model tiers once (fast, capable, reasoning, local), then just type - Smart Chat routes each message by complexity and privacy, and keeps sensitive text local - Switch local and remote models mid-conversation, keeping context System Keyboard - Bring Privacy AI into any app: dictate by voice, or rewrite, translate and reshape text in place - Build named pipelines (Polish then Translate) or use presets like Proofread - Types in 11 languages with Pinyin, Japanese and Korean input Mini Apps - Doc Scanner: turn a PDF, photo or camera scan into clean Markdown, tables and equations intact - Email Assistant: triage any IMAP inbox on device, with a dated report you can undo - Knowledge Wiki: a cross-linked knowledge base from your documents, with cited answers - LLM Council: query several models in parallel and synthesize one answer - Custom assistants with instructions, an avatar, and a knowledge base Tools - 60+ built-in tools: web search, news, calendar, code execution and more - Full MCP support with a marketplace, Siri and Shortcuts Writing and Voice - Long-form writing assistant that drafts outlines and chapters - Text to Audio: turn a document into a single audio file using on-device voices - Real-time voice chat and live transcription Files and Content - Convert PDFs, Office files, EPUB, video and audio to Markdown, with OCR - Media Studio: generate images with your provider Accessibility - VoiceOver support, sound and haptic feedback, Verbose Announcements - View Assistant: point the camera and hear what is in front of you Free to Use. No Ads. Local model features are free, including the AI keyboard, knowledge wiki, writing assistant, custom assistants, 60+ tools, document reader, and image generation. Cloud API models and the MCP marketplace need a subscription. Privacy by Design Privacy AI runs on-device. No backend servers. No accounts. No data collection. Every API request is visible in the Protocol Inspector. Your models. Your device. Your data. Terms of Use: https://privacyai.acmeup.com/docs/policy/tos.html Privacy Policy: https://privacyai.acmeup.com/docs/policy/privacy.html
BookWrite
This app transforms your writing experience by allowing you to craft books with customizable aesthetics, from cover design to page style. It offers tools for organizing stories, drawing, illustrating, and exporting your work in various formats. It also includes features to help you maintain writing habits and ensure your work remains private.
- Customizable book aesthetics (cover, pages, pen)
- Locked diary with Face ID/passcode
- Drawing and illustration tools
- Story organization (plot board, story bible)
- Export to PDF, EPUB, TXT, audiobook
- Writing goal tracking and prompts
- Privacy-focused with no ads or tracking
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Step through the door of an old bookshop and write. Open ScribeMe and you're standing at the door of a bookshop. Push it open, step inside, and your library is waiting on the shelf - every book you've written, standing spine-out, in whatever order you like. MAKE A BOOK, NOT A DOCUMENT Choose how a book feels before you write a word: hardcover, leather, cloth or paperback; the colour of the boards; cream, white or parchment pages; and the pen in your hand - fountain pen, ballpoint, pencil or marker, each with its own ink and weight of line. Pick a typeface with real character. Every cover gets its own grain, so no two books on your shelf look alike. Tall, square and wide picture-book shapes are all here. A DIARY THAT LOCKS Any book can be locked with Face ID or your passcode - a private diary that stays private. Night pages give you dark paper and light ink for writing after bedtime. WRITE, DRAW, ILLUSTRATE Real styling: bold, italics, centred lines, scene breaks. Draw straight onto the page with Apple Pencil or a fingertip, and add photo illustrations wherever you like. Draw your own cover, too. ORGANIZE A REAL STORY Chapters with a contents sheet. A plot board that lays your pages out at a glance. A story bible that interviews your characters and remembers your places. Story templates - three acts, hero's journey, fairy tale, mystery - that scaffold the chapters for you. Find and replace, and search across the whole shelf. TAKE IT OFF THE DEVICE Export a typeset PDF with cover, dedication, contents and illustration plates. Print a fold-at-home booklet. Make an EPUB ebook, a plain-text file, or an audiobook read aloud. Back up your whole library to a single file and carry it to another device. KEEP GOING Daily goals, streaks, milestones and writing sprints. A home-screen widget with your shelf and your streak. An evening writing prompt if you want one. Read a finished book with a real page curl, or have it read to you. YOURS, AND PRIVATE No account, no sign-up, no ads, no tracking, no subscriptions, and nothing is ever collected. Your books live on your device. Turn on iCloud sync (beta) and they sync through your own private iCloud - still nobody else's. Automatic version snapshots mean nothing you write is ever really lost. Everything in ScribeMe is included, free. It always will be. Made for iPhone and iPad.
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Verdict
The clearest difference is in-app purchases: BookWrite at none against Privacy AI's 3. BookWrite also leads on rating (5.0 vs 4.8). Privacy AI's advantage is ratings volume (20 vs 1) and update cadence (weekly vs every 3 weeks). On price, ads, device support and iOS requirement 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. Privacy AI sells 3 in-app purchases, starting at $3.99 per 7 days. BookWrite asks for nothing beyond the download.
BookWrite holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Privacy AI has 20 ratings behind it against 1, so its average is the more settled of the two.
Privacy AI ships an update weekly, BookWrite every 3 weeks. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.
| Parameter | Privacy AI | BookWrite |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (20 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 92.3% of reviews | — |
| Number of ratings | 20 — better | 1 |
| Update frequency | Weekly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 — better | 18.1 |
| Further details — not scored | ||
| Size | 3.4 GB | 5 MB |
| Age rating | 17+ | 4+ |
| Developer | AcmeUp Inc. | Richard Wheatley |
Customer experience
Privacy AI
BookWrite
In-app purchases
Privacy AI
- Weekly Pro Plan$3.997 Days
- Monthly Pro Plan$9.991 Month
- Yearly Pro Plan$99.991 Year
BookWrite
No in-app purchases









