Comparison

Vector Space AI vs Private AI

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

Head to head
About

Vector Space AI

This app offers a fast, private AI companion that runs locally on your device, providing instant responses for writing, brainstorming, and coding. It also allows seamless switching to cloud-based AI for more advanced queries.

Highlights
  • Runs locally on device
  • Optional ChatGPT API connection
  • Modern and clean interface
  • Instant response times
  • Complete user data privacy
  • Seamless mode switching
Features
Read full description

Chat with FREE, FAST and POWERFUL AI that runs LOCALLY on your iPhone Meet your new AI companion that’s always available β€” no cloud, no lag, just pure speed. Our advanced local AI engine runs directly on your iPhone, giving you instant responses, full privacy, and offline intelligence. Whether you’re writing, brainstorming, translating, or coding β€” everything happens right on your device. And when you want to connect to the cloud, simply switch to ChatGPT API mode for even more powerful, up-to-date answers. Key Features: - Runs Locally β€” Experience lightning-fast chat without internet or server delay. - Optionally, Connect to by ChatGPT API β€” Access the world’s smartest AI whenever you want. - Beautiful Modern Design β€” A clean, elegant interface built for clarity and focus. - Instant Responses β€” No waiting. No spinning wheels. Just smooth conversation. - Completely Private β€” Your data stays on your device. Nothing leaves your phone. - Seamless Mode Switching β€” Toggle between local AI and ChatGPT in one tap. Why You’ll Love It: Because it’s your AI β€” fast, powerful, private, and beautifully crafted. Talk, create, think, and explore ideas anywhere β€” even offline. Download now and experience the future of AI β€” FAST. PRIVATE. BEAUTIFUL. LOCAL.

About

Private AI

Features
Read full description

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: β€’ Study & Learn: Teacher, Summarizer, Simplifier β€’ Coding: Code Expert, Debugger, Technical Writer β€’ Writing: Creative Writer, ReWriter, Spell Checker, Poet, Story Teller β€’ Business: Analyst, Marketer, Meeting Notes, Recruiter, Planner β€’ Creative: Brainstormer, Social Media, Guide Creator, Motivator β€’ 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 β†’ Private AI is 100% offline They charge monthly subscriptions forever β†’ Private AI is yours (one-time purchase) They track your usage & conversations β†’ Private AI has zero analytics, zero tracking They can't guarantee where your data goes β†’ Private AI your data never leaves your device WHO IS THIS FOR? β€’ Students - Study aids, research analysis, essay help, exam prep β€’ Professionals - Confidential docs, reports, presentations, meeting notes β€’ Developers - Code review, debugging, documentation, architecture planning β€’ Writers - Brainstorming, editing, storytelling, content creation β€’ 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 β€’ Multiple isolated conversations - keep contexts separate β€’ Document library - reuse files across chats β€’ Beautiful themes - customize every color β€’ Smart search - find conversations and documents instantly β€’ Markdown support - beautifully formatted responses β€’ 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: β€’ iOS26 β€’ iPhone 15 Pro or iPhone 16+ models β€’ iPad mini (A17 Pro) or iPad with M1+ β€’ Mac with Apple Silicon (M1+)

Screenshots

Vector Space AI3 screens
Private AI4 screens

Verdict

The call

The clearest difference is price: Vector Space AI at Free against Private AI's $4.99. Vector Space AI also leads on iOS requirement (18.0 vs 26.0). Private AI's advantage is chart position (#195 vs unranked). On update cadence, ads, in-app purchases and device support there is nothing between them.

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

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

Vector Space AI is free to download; Private AI costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Vector Space AI ships an update every 4 days, Private AI every 2 days. The most recent releases landed on September 7, 2026 and July 30, 2026 respectively.

Scorecard3 real differences Β· 6 level
Vector Space AI versus Private AI: the parameters behind the verdict, then further details
ParameterVector Space AIPrivate AI
PriceFree β€” better$4.99
Positive reviews100.0% of reviewsβ€”
Update frequencyEvery 4 daysEvery 2 days β€” better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeβ€”
Best chart rankβ€”#195 β€” better
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.0 β€” better26.0
Further details β€” not scored
Size34 MB6 MB
Age rating4+12+
DeveloperVoila Tech K.KGTechnologies LLC

In-app purchases

None

Vector Space AI

No in-app purchases

None

Private AI

No in-app purchases

Questions

Is Vector Space AI free?
Vector Space AI is free to download, with no in-app purchases.
Is Private AI free?
Private AI costs $4.99, with no in-app purchases.
Do Vector Space AI or Private AI have ads?
Neither Vector Space AI nor Private AI shows ads.
Which is updated more often, Vector Space AI or Private AI?
Vector Space AI ships an update every 4 days, and Private AI every 2 days. Most recently, Vector Space AI was updated on September 7, 2026 and Private AI on July 30, 2026.

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