DeepSeek brings frontier-class intelligence to your phone. V4 models, DeepThink reasoning, 1M token context, voice input, file uploads — 100% free with no ads and no subscriptions.
DeepSeek's app doesn't cut corners. You get the same V4 frontier models as developers use in production — wrapped in a smooth, native interface built for touch.
Tap to enable chain-of-thought reasoning. Watch the model think step-by-step before answering — perfect for math, logic, and complex analysis.
Speak your questions naturally. Voice-to-text transcription feeds directly into the model for hands-free AI assistance anywhere.
Attach PDFs, documents, spreadsheets, and images. The app extracts and analyzes content with full 1M token context.
Start a conversation on your phone, continue on web or desktop. All history syncs instantly across your signed-in devices.
Ask about current events, recent news, or live data. DeepSeek searches the web and cites sources directly in its answers.
subset of the network. V4-Pro has 1.6T total params but activates only 49B per token — delivering frontier quality at a fraction of the compute.def moe_forward(x, experts, router): weights = router(x) top_k = weights.topk(2) return sum(top_k)From everyday questions to deep research — DeepSeek's feature set covers every use case, completely free.
Enable chain-of-thought reasoning for hard problems. The model shows its thinking process before answering — dramatically better on math, logic, and multi-step analysis.
Reasoning ModeReal-time search integration. Ask about current news, recent events, or live data. Every answer includes source citations for verification.
Real-TimeAttach PDFs, Word docs, spreadsheets, and text files. DeepSeek extracts and understands the full document in a single session using 1M token context.
Document AIUpload photos, screenshots, charts, or diagrams. Ask questions about what's in the image — OCR, diagram explanation, visual debugging, and more.
VisionSpeak instead of type. Voice-to-text feeds directly into the AI for hands-free use while driving, cooking, or on the go.
VoiceFull conversation history within a session. Reference earlier messages, build on previous answers, and maintain complex ongoing dialogues across 1M tokens.
ContextChat history syncs across iOS, Android, and web. Sign in with Email, Google, or Apple ID to access your conversations on any device.
SyncGenerate, review, debug, and explain code in 340+ languages. Syntax highlighting, multi-file understanding, and repository-level analysis built in.
Dev ToolsDeepSeek's basic services are permanently free with no hidden "speed boost packs" or usage cards. No ads. No in-app purchases required to unlock core features.
Always FreeStrong support for English, Chinese, and 30+ other languages. Translate, write, and converse across languages with native-level fluency.
30+ LanguagesUpload spreadsheets or CSVs and ask questions about your data. Generate charts, find trends, and get statistical insights in plain language.
AnalyticsV4-Flash for everyday questions — lightning-fast responses for chat, summaries, drafts, and quick lookups without the reasoning overhead.
FastEvery DeepSeek model is available in the app — switch between them in one tap. All free for personal use.
Fast everyday AI. 284B MoE model, 1M context. Handles chat, coding, writing, and analysis instantly. The app's default for most queries — blazing fast, impressively capable.
Frontier intelligence. 1.6T params, 49B active. Highest Codeforces score (3,206), 80.6% SWE-bench. Use for complex coding projects, advanced math, and deep research.
Pure reasoning engine. 97.3% MATH-500, IMO Gold Medal. Toggle DeepThink to see the model's complete thought process before it answers — incredible for hard problems.
Every model in the app is completely free for personal use. No Plus tier. No token limits for normal chat. Switch between Instant Mode, Expert Mode, and DeepThink instantly.
Millions of users rely on DeepSeek daily for tasks spanning study, work, code, and creativity.
Upload lecture notes, research papers, or entire textbooks. Get explanations, summaries, quiz questions, and step-by-step solutions across any subject.
Debug errors from screenshots, generate boilerplate, review pull requests, and understand unfamiliar codebases — all from your phone during commute or coffee breaks.
Upload contracts, reports, or financial statements up to 1M tokens. Ask specific questions and get precise answers without reading every page manually.
Enable DeepThink for competition math, physics problems, or chemistry equations. The model shows every reasoning step — perfect for learning and verification.
Draft emails, articles, essays, reports, and creative writing. Improve tone, fix grammar, translate between languages, and maintain consistent voice across long documents.
Upload spreadsheets and ask data questions in plain English. Summarize meeting notes, generate action items, draft proposals, and prepare presentations.
Available on iOS, Android, and web. Always download from official sources to avoid fake apps.
On your iPhone or iPad, tap the blue App Store icon. Tap the Search tab at the bottom.
Type DeepSeek in the search bar. Look for the official app: DeepSeek – AI Assistant by 杭州深度求索人工智能基础技术研究有限公司.
Tap GET (it's free). Authenticate with Face ID, Touch ID, or your Apple ID password to begin installation.
Log in with Email, Google, or Apple ID for history sync — or start chatting immediately as a guest. No account required for basic use.
Tap the Play Store app and search for DeepSeek. Verify the developer is listed as DeepSeek.
Tap Install. No purchase or subscription needed. The app is 100% free with no in-app purchases required for core features.
For direct APK installation, only use download.deepseek.com/app. Never install APKs from unofficial third-party sources.
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 favorite. It's very human, speaks like a friend, and has great humor. It understands what you're asking even if you can't find the words. Explains things in super clear ways with great depth — never just the surface level."
everyday use"I use DeepSeek for helping study Chinese, and it's excellent. Being able to ask questions informally instead of keyword-browsing is great. Set up a chat with rules and it follows them well. Compared to GPT it doesn't glaze as constantly."
language learning"Switched our entire RAG pipeline from GPT-4o to V4-Flash. Monthly API bill dropped from $1,200 to $38. Same quality for document summarization. The 90% cache discount makes the math absolutely bonkers for production use."
developer"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 DeepSeek V4-Flash as my coding agent via Claude Code. The agentic coding is legitimately on par with V4-Pro for most repo tasks — and you're paying $0.14/$0.28 instead of $5/$20. Change two config lines. Done."
coding agent"App is technically impressive but sometimes server is busy during peak hours. Also worth knowing: it's a Chinese company and data goes to servers in China — not ideal for sensitive information. For personal/non-sensitive use it's fantastic though."
⚠️ privacy noteYes — completely free with no hidden costs. The app has no in-app purchases required for core features, no subscription tier, no "speed boost packs," and no ads. DeepSeek explicitly states that basic services are permanently free. You get full access to V4-Flash (Instant Mode), V4-Pro (Expert Mode), and DeepThink (R1 reasoning) at $0. The only paid service is the separate developer API for building applications — the consumer app itself is always free.
Use only official sources: App Store (search "DeepSeek – AI Assistant", developer: 杭州深度求索), Google Play (package: com.deepseek.chat), or the official download page at download.deepseek.com/app. There are many fake DeepSeek apps on unofficial APK sites — avoid them. DeepSeek does not have a Windows or macOS desktop app; use the web at chat.deepseek.com for desktop access.
DeepThink mode enables chain-of-thought reasoning powered by DeepSeek-R1. When activated, the model explicitly works through its reasoning process step-by-step before delivering an answer. Use it for: competition math problems, complex logic puzzles, multi-step scientific analysis, legal interpretation, and any task where showing the reasoning matters as much as the answer. Avoid it for: simple questions, quick summaries, or latency-sensitive tasks — it takes 15–60 seconds longer but produces significantly better answers on hard problems.
The app supports document uploads including PDFs, Word (.docx), plain text, and CSV files — as well as image uploads (JPG, PNG, screenshots). The 1M token context window means you can upload very long documents without chunking. For images, the model can perform OCR, describe visual content, read charts, and answer questions about what's shown. Batch file uploads and video analysis are not yet supported in the consumer app.
No — the app requires an internet connection to run inference on DeepSeek's cloud servers. All AI processing happens server-side. The app may cache recent conversations for viewing offline, but new queries require connectivity. If you need offline AI: consider self-hosting a quantized DeepSeek model using Ollama or LM Studio on a sufficiently powerful device. The weights are open-source under MIT license.
DeepSeek is a Chinese company (Hangzhou DeepSeek Artificial Intelligence Co.) and data processed through the app is stored on servers subject to Chinese law. For personal, non-sensitive use (studying, coding, creative writing), most users find this acceptable. For sensitive or regulated data (healthcare, legal, financial), consider: (1) using DeepSeek via AWS Bedrock or Azure AI which offer data residency guarantees, or (2) self-hosting the open-source model weights on private infrastructure. The app has been reviewed by some researchers for security concerns — always make informed decisions based on your data sensitivity.
In the chat interface, look for the model selector at the top. Instant Mode uses V4-Flash (fast, everyday AI). Expert Mode uses V4-Pro (frontier intelligence for complex tasks). Toggle DeepThink to activate R1 chain-of-thought reasoning on top of either mode. All modes are free — there's no paywall for any model.
With 131.5M monthly users, DeepSeek's free servers experience peak demand — especially during business hours in China (UTC 00:00–08:00) and US daytime hours. "Server Busy" responses are temporary — retrying usually works within a few minutes. For production use cases that require 99.9%+ availability, use the API via paid providers like Together AI, Fireworks, or AWS Bedrock instead of the consumer app.
131.5 million people already use it. Join the world's fastest-growing AI app — no credit card, no subscription, no limits.
✓ No ads · ✓ No in-app purchases · ✓ No subscription · ✓ MIT open source