DeepSeek for iPhone and iPad delivers V4-Pro Expert Mode, DeepThink chain-of-thought reasoning, live web search, and full file analysis - completely free with no subscription, no ads, and no message limits.
The same V4 frontier models developers run in production — wrapped in a smooth, native iOS interface built for touch. No compromises, no cost.
Expert Mode activates DeepSeek-V4-Pro — Codeforces #1 (3206 Elo), 80.6% SWE-bench Verified, 97.3% MATH-500. DeepThink surfaces the full chain-of-thought before each answer — completely free on every iPhone.
Toggle Web Search for live, cited answers on today's news and events. Tap the paperclip to upload PDFs, DOCX, or code files — 1M token context means even book-length documents are fully processed. Voice dictation via Apple's on-device speech stack keeps audio private.
Every DeepSeek model available in the app — switch in a single tap. All completely free for personal use with no limits.
Fast everyday AI. 284B MoE, 13B active, 1M context. Handles chat, coding, writing, and analysis instantly. The app's default — blazing fast, impressively capable for nearly all tasks.
Frontier intelligence. 1.6T params, 49B active. Highest Codeforces score (3,206 Elo), 80.6% SWE-bench Verified. Use for complex coding, advanced math, and deep research.
Pure reasoning engine. 97.3% MATH-500. IMO 2025 Gold Medal. Toggle DeepThink to see the model's complete thinking process before answering — incredible for math and logic.
Every model in the app is free for personal use. No Plus tier. No message caps. Switch between Instant, Expert, and DeepThink instantly — at $0, forever.
From everyday questions to deep research — DeepSeek's iOS feature set covers every use case at zero cost, with deep Apple platform integration.
Enable chain-of-thought reasoning — the model shows its thinking process before answering. Dramatically better on math, logic, and multi-step analysis. Toggle on/off per message, works in both modes.
Reasoning ModeReal-time search integration for current events, news, prices, and live data. Every answer includes source citations for verification. Toggle per message — combine with DeepThink for cited reasoning.
Real-TimeAttach PDFs, Word docs, spreadsheets, and text files. Full 1M token context reads the entire document — no chunking, no truncation. Share directly from Files app or iOS Share sheet.
Document AISpeak instead of type. Uses Apple's on-device speech-to-text — audio processed locally on your iPhone, never sent to a third-party server. Transcript sent as a normal text prompt.
On-DeviceStart on iPhone, continue on iPad or web. All conversation history syncs instantly across signed-in devices. Sign in with Apple ID, Google, or email to unlock sync.
Instant SyncFull Apple ID support with private relay email — DeepSeek never sees your real email address. Also supports Google Account and email. 60-second onboarding from install to first message.
Max PrivacySyntax-highlighted code blocks for 340+ languages with one-tap copy. Language label on every block. Paste directly into Xcode, VS Code, or any editor.
340+ LanguagesHighlight text in Safari, Notes, or Mail — tap Share → DeepSeek to open with that text as your prompt. The deepest iOS integration of any AI assistant available today.
Any AppFull iPad support with sidebar conversation list, keyboard shortcuts, and optimised touch targets. Works in Split View alongside Safari, Notes, or Xcode.
Split ViewLaTeX equations render inline and as block — beautifully formatted in both Instant and Expert mode. Essential for physics, calculus, and proof walkthroughs on the go.
LaTeXTap any message to edit and regenerate from that point. Dislike a response? Regenerate instantly. Rate with like/dislike — your feedback directly shapes future model improvements.
IterateBasic services are permanently free with zero ads, zero "speed boost" packs, and zero hidden tiers. DeepSeek monetises through the developer API only — the consumer app is always free.
Always FreeMillions of users rely on DeepSeek daily for study, work, code, and creativity — all from the phone in their pocket.
Upload lecture notes, research papers, or entire textbooks. Get explanations, summaries, and step-by-step solutions across any subject. Expert Mode with DeepThink shows every reasoning step — better than any search engine.
Debug errors during your commute, generate boilerplate at a coffee shop, review PRs from your phone. 340+ languages, Codeforces #1 reasoning — in your pocket at zero cost.
Share a PDF from Mail to DeepSeek and ask questions immediately. Summarise research papers, extract clauses, get key points from 200-page reports — the 1M token context handles it all.
Enable DeepThink for competition math, physics, or chemistry. 97.3% MATH-500, IMO 2025 Gold. The model shows every reasoning step with LaTeX rendering — perfect for verification and learning.
Draft emails, essays, and posts using voice dictation. Improve tone, fix grammar, translate between 50+ languages. Instant Mode gives quick suggestions; Expert Mode analyses structure and argument quality.
Practice Chinese, Japanese, or Spanish with a patient AI tutor. Particularly strong in Chinese — rated the best Chinese-language AI. Ask for grammar corrections, vocabulary, and cultural context anywhere.
Always download from official sources — the App Store has dozens of fake "DeepSeek" apps. The real app is free with no in-app purchases required for any feature.
On iPhone or iPad tap the App Store icon → Search. Or use the direct link: apps.apple.com (App ID: 6737597349). Direct link guarantees the real app.
Before tapping Get, confirm the developer is 杭州深度求索人工智能 and the app name is exactly DeepSeek – AI Assistant. Any other name is an impostor charging for a free service.
Tap Get — it's free, $0. Authenticate with Face ID, Touch ID, or Apple ID password. The app is ~60 MB and installs in seconds on any modern iPhone.
Tap Sign in with Apple for max privacy — Apple's private relay hides your real email from DeepSeek. Or use Google Account or email. Account required for cross-device history sync.
6737597349 and developer name 杭州深度求索人工智能 before installing.
Open Play Store and search DeepSeek. Or use the direct link: play.google.com (package: com.deepseek.chat).
Confirm the developer is DeepSeek and package ID is com.deepseek.chat. Tap Install — 100% free, no in-app purchases required for any feature.
For direct install, only use download.deepseek.com/app/. Never install APKs from third-party sites — these frequently contain malware.
Sign in with Google Account or email. All features are identical to iOS — Expert Mode, DeepThink, web search, and file upload. Cross-device sync works between Android, iOS, and web.
Real reviews from App Store, Google Play, and community forums — the good, the great, and the honest.
"I've used every AI. This is easily my favourite. It's very human, speaks like a friend, has great humour. It understands what you're asking even if you can't find the words. Explains things with great depth — never just the surface level."
everyday use"I use DeepSeek to study Chinese and it's excellent. Being able to ask questions informally instead of keyword-browsing is great. Set up rules and it follows them well. Compared to GPT it doesn't glaze constantly."
language learning"R1's DeepThink for math is insane. 97.3% on MATH-500 completely free in the app. Watching it reason through olympiad problems step-by-step is genuinely educational. Nothing else comes close at zero cost."
math & science"Using V4-Flash as my coding agent backend. Agentic coding on par with V4-Pro for most repo tasks — and you're paying $0.14/$0.28 via API, not $20/month. Changed two config lines. Done."
coding agent"Switched our entire RAG pipeline from GPT-4o to V4-Flash. Monthly API bill dropped from $1,200 to $38. Same quality for document summarisation. The 90% cache discount makes the math absolutely bonkers."
developer"App is technically impressive but servers can be busy at peak hours. Worth knowing: it's a Chinese company and data goes to servers in China — not ideal for sensitive info. For personal/non-sensitive use it's fantastic."
⚠ privacy noteDeepSeek is powerful and free — but genuine privacy considerations are worth understanding before using it for sensitive conversations.
Data stored in China: Conversations are processed and stored on DeepSeek's servers in China. Under Chinese law, this data can be subject to government access requests. This matters for sensitive personal, business, legal, or medical conversations.
Regional restrictions: Italy banned the app in 2025. South Korea issued government-use restrictions. Germany raised concerns and temporarily removed it from stores. Check local regulations — especially in regulated industries.
What's fine: General questions, coding, math, language learning, creative writing, and public-information tasks. For these, the privacy risk is minimal and the app is genuinely excellent. DeepSeek states: "100% free, no ads, no in-app purchases."
For sensitive work: (1) Self-host distilled R1 models via Ollama — no data leaves your device. (2) Route through AWS Bedrock or Azure AI for GDPR-compliant EU hosting with enterprise SLAs.
Yes — completely free. DeepSeek's official announcement states: "100% free, no ads, no in-app purchases." Both Instant Mode (V4-Flash) and Expert Mode (V4-Pro + Think Max) are fully unlocked. DeepThink, web search, and file upload are all included. There is no premium subscription tier for the consumer app. DeepSeek monetises through the developer API — the chat app is a demonstration product at $0. ChatGPT charges $20/month Plus for comparable Expert Mode access.
The official iOS app is titled DeepSeek – AI Assistant. The developer is 杭州深度求索人工智能基础技术研究有限公司 (Hangzhou DeepSeek Artificial Intelligence). The App Store ID is 6737597349. Impostor signs: (1) charging for access or requiring in-app purchases, (2) different developer name, (3) claiming features the official app doesn't list. The real app is always free with no in-app purchases whatsoever.
Instant Mode (default) uses V4-Flash — 284B parameters, fast (~83 tok/s) streaming. Great for everyday questions, writing, and casual tasks. Expert Mode uses V4-Pro — 1.6T parameters with Think Max reasoning depth. Slower but frontier-quality: 80.6% SWE-bench Verified, Codeforces #1 (3206 Elo). Start with Instant for most queries; switch to Expert for hard math, complex code, or research where accuracy matters most. Both are always free.
The app launched January 10, 2025. By January 27 — 17 days later — it surpassed ChatGPT as the #1 free app in the US, reaching #1 in 51+ countries simultaneously. The trigger: R1's release on January 20 demonstrated an open-source model matching OpenAI o1 at 90–95% lower cost, triggering global media coverage ("Sputnik moment"), an 18% drop in Nvidia's stock price, and 2.6 million app downloads in a single week. By 2026 it has grown to 131M+ monthly active users across 157 countries.
Yes — full feature parity for all core capabilities. Both offer Instant Mode, Expert Mode, DeepThink, Web Search, file upload, history, and cross-device sync. The iOS app adds exclusively: Sign in with Apple (private relay email), voice dictation via Apple's on-device speech (audio processed locally), iOS Share sheet integration (send text from any app), and iPad multitasking (Split View). The web version adds a code sandbox that executes generated code in-browser — web-only.
Voice input: Yes. Tap the microphone icon in the composer. Uses Apple's on-device speech-to-text — audio processed locally on your iPhone, never sent to DeepSeek. Only the text transcript is forwarded. No text-to-speech output currently. Image upload: You can upload images, but full visual understanding is still limited as of V4 launch (April 2026). The model primarily extracts and processes text from documents. Expect this to improve in future updates as DeepSeek's vision capabilities mature.
Available in most countries but with notable exceptions: Italy banned it and removed it from the Italian App Store in 2025. Germany temporarily restricted it. South Korea issued government-use restrictions (personal use remains allowed). If the app isn't in your regional App Store, do not sideload from unofficial sources — significant security risk. For restricted regions, chat.deepseek.com may still be accessible via browser.
The app that beat ChatGPT to #1 in 157 countries. Expert Mode with V4-Pro. DeepThink reasoning. Web search. File upload. Completely free, forever. Download in 60 seconds.