If you want DeepSeek on iPhone, the short answer is: install the official “DeepSeek – AI Assistant” app from the App Store, sign in, and you are talking to DeepSeek V4 within a minute. The longer answer matters more, because the App Store has a history of knock-off apps with similar names, privacy settings vary by region, and the iOS experience behaves very differently from the API most developers write about. This guide walks through verified installation, account setup, model selection (including the DeepThink toggle for V4 thinking mode), privacy configuration for UK/EU/US readers, iOS Shortcuts integration, and when you should reach for the API instead of the app.

The direct answer: yes, DeepSeek runs natively on iPhone

DeepSeek ships a free official iOS app called DeepSeek – AI Assistant, published by Hangzhou DeepSeek Artificial Intelligence Co., Ltd. It runs on any iPhone with iOS 14 or later, including older devices like the iPhone 8 and SE (2nd gen). Since April 24, 2026, the app serves DeepSeek V4 as the default model, with a DeepThink toggle that switches between non-thinking and thinking mode on the same underlying model.

Two things to understand before you install:

• The app is a client, not the model. Your prompts go to DeepSeek’s servers in China, and responses come back. The app does not run V4 on your phone — V4-Flash alone is 284B parameters with 13B active, which no phone can host.
• The iOS app and the developer API are different products. The app keeps your chat history across sessions; the API is stateless. If you are building software, see the DeepSeek API documentation instead of this guide.

Step 1: Install the official app (and verify it is the real one)

Open the App Store and search for DeepSeek. The legitimate listing has these markers:

1. App name: DeepSeek – AI Assistant
2. Developer: Hangzhou DeepSeek Artificial Intelligence Co., Ltd. (tap the developer name to confirm)
3. Icon: a dark blue whale silhouette on a white or light background
4. Price: Free, with no in-app purchases on the main listing

If a listing asks for a subscription, shows an unfamiliar developer, or bundles the name with words like “Pro”, “Plus”, or “GPT” in the title, it is a copycat. For a longer walkthrough with current screenshots, see our guide to verifying the official DeepSeek app.

Step 2: Create or sign in to your account

On first launch, the app offers three sign-in methods:

• Email address and password
• Phone number (SMS verification)
• Sign in with Apple

Sign in with Apple is the most privacy-friendly option for UK, EU, and US users — Apple’s Hide My Email relays your address, so DeepSeek never receives your real one. For a broader walkthrough of the onboarding flow, including email verification quirks, see our DeepSeek account setup guide. If you hit a password reset loop, the reset DeepSeek password guide covers the common causes.

Step 3: Pick the right mode for the task

The iOS app exposes two controls above the compose box: the DeepThink toggle and a Web Search toggle. Both sit on top of V4; they are not separate models.

You can combine DeepThink and Web Search for research-style questions. Under the hood the app is talking to V4-Flash (the cost-efficient tier) on both toggles — the difference is the reasoning_effort parameter the app sends on your behalf.

Step 4: Configure privacy before you type anything sensitive

DeepSeek’s servers are in China, and processed conversations may be used to improve the service unless you opt out. That is legal under Chinese data law and consistent with how most major AI vendors handle free-tier chat, but it has material consequences for users in regulated industries. For a deeper breakdown, see our DeepSeek privacy explainer.

At minimum, do the following inside Settings → Data Controls (exact wording varies by app version):

• Turn off Improve the model for everyone if you see a toggle for it.
• Disable chat history if you want zero-retention sessions. Note: this also means you lose your own history, not just DeepSeek’s.
• Review the microphone and photo-library permissions iOS granted — revoke in iOS Settings → DeepSeek if you do not use voice or image input.

Italy’s Garante blocked the DeepSeek app in January 2025, and individual US states including Texas, New York and Virginia have restricted it on government devices. If you work for a regulated employer, check your organisation’s acceptable-use policy before signing in; for a country-by-country summary, see DeepSeek availability by country.

Step 5: Wire DeepSeek into iOS Shortcuts (optional but powerful)

The iOS app does not expose a native Shortcuts action as of April 2026, but you can build your own using the POST /chat/completions endpoint — the OpenAI-compatible chat endpoint DeepSeek runs at https://api.deepseek.com. This turns any Siri trigger (“Hey Siri, ask DeepSeek…”) into an API call.

You will need a DeepSeek API key; the API key setup guide covers that. Then in Shortcuts, add a Get Contents of URL action configured like this:

URL:     https://api.deepseek.com/chat/completions
Method:  POST
Headers:
  Authorization: Bearer YOUR_API_KEY
  Content-Type:  application/json
Body (JSON):
{
  "model": "deepseek-v4-flash",
  "messages": [
    {"role": "user", "content": "ShortcutInput"}
  ],
  "temperature": 1.3,
  "max_tokens": 1024
}

A few notes specific to iOS Shortcuts:

• Use deepseek-v4-flash for chat-style prompts — it is roughly 7× cheaper on output than deepseek-v4-pro and fast enough for voice.
• If you want thinking mode for harder questions, add "reasoning_effort": "high" and accept the extra latency. The response will contain reasoning_content alongside the final content; parse whichever field you want to speak back.
• Shortcuts has no chat memory. The API is stateless, so each Siri invocation is a fresh conversation unless you persist and resend history yourself.
• Legacy model IDs deepseek-chat and deepseek-reasoner still work until July 24, 2026 at 15:59 UTC, after which they will be rejected. Use V4 IDs in new shortcuts.

For a full walkthrough of the API basics including streaming and tool calling, the DeepSeek API getting started tutorial is the next stop.

What the iPhone app can and cannot do

What works well

• Voice dictation — iOS’s built-in microphone key in the keyboard works fine; DeepSeek does not need its own speech-to-text.
• Image input — you can attach photos for OCR, chart reading, and document description. Quality is good for printed text; handwriting is hit-or-miss.
• File uploads — PDFs up to a few megabytes summarise well. The 1,000,000-token context window on V4 means even long contracts fit, though the app truncates very large files on the client side.
• Background sync — chat history syncs to your DeepSeek account, so you can pick up a conversation on the web version or the Android app.

What does not work on iPhone

• Running the model locally. V4-Flash is 284B parameters. No iPhone can host it. If you want offline inference, look at a distilled R1 model via an iOS-compatible runtime — see DeepSeek offline setup.
• Custom system prompts. The app does not expose a system-prompt field. For persona control, use the API or a third-party client.
• Tool calling and JSON mode. These are API-only features.
• Long-form output above the app’s display cap. The app truncates very long responses in the UI even though the API can emit up to 384,000 output tokens.

App vs browser vs API on iPhone

Three ways to reach DeepSeek from an iPhone, each with trade-offs:

For context on when the app falls short, the browser vs app comparison lays out specifics.

Cost if you move to the API from your iPhone

The app is free. Moving to the API — say, through a Shortcut or a third-party iOS client like a custom LLM chat app — means you pay per token. Here is a worked example for a typical personal Siri-plus-DeepSeek setup hitting deepseek-v4-flash:

Assume 500 voice-triggered queries per month, each a 150-token prompt and a 400-token answer, with no cached prefix:

• Uncached input: 150 × 500 = 75,000 tokens × $0.14/M = $0.0105
• Cache hit input: 0 tokens × $0.028/M = $0.00
• Output: 400 × 500 = 200,000 tokens × $0.28/M = $0.056
• Total: roughly $0.07 per month

At those volumes the API is effectively free. If you push into deepseek-v4-pro for harder questions, the same workload costs around $0.83 per month — still trivial, but useful to know. For larger workloads, see the DeepSeek API pricing page and our pricing calculator.

Troubleshooting the most common iPhone issues

For anything the table does not cover, the DeepSeek troubleshooting guide is more exhaustive.

Verdict: who should install DeepSeek on iPhone

Install it if you want a free, fast V4 chatbot for drafting, coding snippets, maths homework, and general Q&A, and you are comfortable with a Chinese-hosted service. The free tier has no documented daily message cap as of April 2026 and the app is genuinely competitive with ChatGPT and Claude on most everyday prompts. Skip it if your employer or jurisdiction restricts Chinese AI services, or if you need tool calling, system prompts, or guaranteed zero retention — those belong on the API. If you are evaluating against other assistants first, start with DeepSeek vs ChatGPT.

Last verified: 2026-04-24. DeepSeek AI Guide is an independent resource and is not affiliated with DeepSeek or its parent company. Model IDs, pricing and API behaviour change; check the official DeepSeek documentation and pricing page before committing to a production decision.