Private AI vs Bubble Mail
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Private AI
This AI assistant operates entirely offline on your device, ensuring 100% data privacy. It allows you to chat with your documents using specialized AI experts and custom prompts, without any internet connection or data uploads.
- 100% private and offline operation
- Chat with PDFs, code, spreadsheets, and more
- 25 specialized AI experts and custom prompts
- No subscriptions or in-app purchases
- Leverages Apple Intelligence models
- Zero tracking and zero data uploads
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Transform how you work with information using Private AI: Document Chat, the AI assistant that keeps 100% of your data private on your device. No internet required. No data uploaded. Ever. 100% PRIVATE & OFFLINE Your conversations, documents, and data stay on YOUR device. Forever. Unlike ChatGPT, Gemini, Claude, or other cloud AI services, Private AI uses Apple's built-in Intelligence models for completely offline, lightning fast responses. Zero tracking. Zero uploads. Zero compromises. Perfect for confidential, sensitive, or personal use. NO HIDDEN COSTS No subscriptions. No in-app purchases. No "premium" features locked behind paywalls. Buy once, use forever. POWERED BY APPLE INTELLIGENCE Built exclusively for iPhone 15 Pro+, iPad M1+, and Mac with Apple Silicon. No large, external vendor model downloads eating your storage - Private AI leverages the powerful AI models already in your device from Apple. Fast, efficient, and always ready. CHAT WITH YOUR DOCUMENTS Upload PDFs, code files, spreadsheets, notes, research papers, meeting transcripts, word documents, and more. With any text-based file, you can ask questions, get summaries, extract insights, analyze data, and more using advanced RAG (Retrieval Augmented Generation) technology. Your personal document library becomes instantly searchable and queryable. 25 SPECIALIZED AI EXPERTS READY TO USE No prompt engineering needed. Just pick your expert: • Study & Learn: Teacher, Summarizer, Simplifier • Coding: Code Expert, Debugger, Technical Writer • Writing: Creative Writer, ReWriter, Spell Checker, Poet, Story Teller • Business: Analyst, Marketer, Meeting Notes, Recruiter, Planner • Creative: Brainstormer, Social Media, Guide Creator, Motivator • Utility: Translator, Pros & Cons, Follow Ups, Concise Mode Plus, create unlimited custom prompts for your specific needs! VS CHATGPT, CLAUDE, GEMINI, & OTHERS They require internet & upload your data → Private AI is 100% offline They charge monthly subscriptions forever → Private AI is yours (one-time purchase) They track your usage & conversations → Private AI has zero analytics, zero tracking They can't guarantee where your data goes → Private AI your data never leaves your device WHO IS THIS FOR? • Students - Study aids, research analysis, essay help, exam prep • Professionals - Confidential docs, reports, presentations, meeting notes • Developers - Code review, debugging, documentation, architecture planning • Writers - Brainstorming, editing, storytelling, content creation • Researchers - Paper analysis, data insights, literature review Anyone who values privacy and wants to leverage AI with sensitive information that absolutely does not belong in the cloud. POWERFUL FEATURES • Multiple isolated conversations - keep contexts separate • Document library - reuse files across chats • Beautiful themes - customize every color • Smart search - find conversations and documents instantly • Markdown support - beautifully formatted responses • No ads, ever - you own the app, not the other way around HOW DOES IT WORK? Private AI uses Apple's Foundation Models that are already on compatible devices. When you upload a document, it's split into intelligent chunks and converted to vector embeddings (mathematical representations of meaning) stored in a local database. When you ask questions, our RAG system finds the most relevant chunks and provides them as context to the AI model alongside your query. The model generates responses using both the retrieved information and its built-in knowledge - all processed locally on your device's Neural Engine. No internet. No APIs. No cloud processing. Just pure, private, on-device AI. Your knowledge. Your privacy. Your control. Download Private AI: Document Chat and experience truly private AI assistance today. REQUIREMENTS: • iOS26 • iPhone 15 Pro or iPhone 16+ models • iPad mini (A17 Pro) or iPad with M1+ • Mac with Apple Silicon (M1+)
Bubble Mail
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Bubble makes Gmail feel less like an inbox and more like a conversation. See every Gmail thread as a clear, chronological exchange while correspondents continue to receive ordinary email. Built for clarity • Gmail thread IDs keep conversations correctly separated • Subjects stay available without dominating the screen • Exact visible recipients are shown before you send • Cleaned message text can always be reversed to the complete original • Search and filters help you find unread, starred, sent, file, and group conversations Clear old clutter safely with Bubble Sweep • Choose Promotions, Social, Updates, or Forums • Filter by age • Protect starred, important, or attachment mail • Preview the exact Gmail search and count before changing anything • Archive by default or move exact matches to recoverable Trash • Leave the Sweep screen or switch apps while work continues on supported iOS versions • Resume from a protected on-device checkpoint if iOS pauses the task • Undo completed changes Private by design Bubble processes and caches mailbox content on your iPhone. It blocks remote images, tracking pixels, scripts, forms, and active HTML by default. Bubble does not sell mailbox data or add advertising or analytics to the mail path. Disconnecting removes the selected account’s Bubble data from the device while the original mail stays in Gmail. Bubble Plus Optional purchases unlock up to eight Gmail accounts, more pins, private templates and signatures, saved triage views, an attachment center, expanded offline history, custom swipe actions, and additional themes, effects, sounds, and app icons. Purchases are handled by Apple. A Gmail account is required for live mail. People using other email apps do not need Bubble. Support: contactenvisiondigital@gmail.com Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: Bubble Mail at Free against Private AI's $4.99. Bubble Mail also leads on iOS requirement (18.0 vs 26.0). Private AI's advantage is in-app purchases (none vs 5). On 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
Bubble Mail is free to download; Private AI costs $4.99 up front. Bubble Mail sells 5 in-app purchases, starting at $2.99 per month. Private AI asks for nothing beyond the download.
| Parameter | Private AI | Bubble Mail |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 3.5 (2 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 days | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 26.0 | 18.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 12 MB |
| Age rating | +12 | 4+ |
| Developer | GTechnologies LLC | ETHAN PEAL |
In-app purchases
Private AI
No in-app purchases
Bubble Mail
- Bubble Plus Monthly$2.991 Month
- Bubble Plus Annual$24.991 Year
- Playful Theme Pack$9.99
- Founding Supporter$14.99
- Bubble Plus Lifetime$49.99









