ChatOKF
Private AI chat on your device
Free
A private assistant that lives on your device: chat, voice in and out, memory that learns you, and web search only when you ask. Nothing leaves without your say.
A capable AI assistant that lives on your iPhone and iPad. The model runs on your device's own chip, so nothing you type is uploaded and nothing is logged. Once a model is downloaded, ChatOKF works in airplane mode.
No account. No sign-in. No subscription. No ads, no analytics, no telemetry.
WHAT YOU CAN DO
- Ask anything: check the math on a loan, plan a week of dinners, untangle a confusing letter.
- Show it a picture: a photo of a menu, a street sign or a whiteboard, straight from your library. Some models also listen to audio and watch video, frame by frame.
- Hand it a document: a PDF, a Word file or a spreadsheet. It reads the tables inside and answers from the file, and one tap opens the page to check it.
- Watch it think: the stronger models reason before they answer. Read the reasoning, tap Quick Answer to cut it short, or switch thinking off for speed.
- Let it look things up: Wikipedia, today's headlines, the weather and web search are tools it can use, each behind its own switch.
- Keep going: it suggests a sensible next question; swipe right to ask it.
- Keep what it gives you: answers are typeset, tables and mathematics included. Search and rename your chats, share one as a PDF, and bring a deleted chat back within thirty days.
- Talk instead of typing: tap the microphone and speak, and have replies read aloud in one of ten voices made on your device.
MEMORY YOU CAN READ
Tell it to remember something and it writes a short note, and the chat says what it wrote. Later questions are checked against your notes first, whichever model is answering. Every note is listed under Memories, to read or to delete. One switch, Total Recall, turns it all off.
WHERE YOUR WORDS GO
Nowhere, unless it looks something up. With Wikipedia on, your question is matched to an article on your device and only that article is downloaded. With web access on, the model's search terms go to a search engine and the pages it chooses are fetched. Settings, Privacy says exactly what leaves your device for each one.
PICK YOUR MODEL
Several open models are offered, and the list shows only what your device can hold, so every one you see will run.
- Gemma 4 E2B and E4B: they see pictures, hear sound and watch video.
- Qwen3.5 2B and 4B: good with tools and longer answers.
- Ternary Bonsai 1.7B: small and fast, for devices with less memory.
GOOD TO KNOW
- The first launch downloads a model, from about half a gigabyte to a few gigabytes. Use Wi-Fi; after that, no network is needed.
- Devices with more memory are offered stronger models, and newer chips answer faster.
- Answers are generated and can be wrong. Check anything that matters.
ChatOKF is written in Swift on Metal, and its source is on GitHub. Models are provided by their authors under their own licenses, including the Gemma Terms of Use.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Voice
- The voice download works again. If you saw "Voice Download Failed", this update fixes it.
- Seventeen voices, in Female and Male tabs: Supertone's ten and seven new synthetic voices. Tap one to hear it.
- Settings, Voice is just the speak mode, the speed and the voices.
Memory
- A new multilingual memory encoder. Notes you make in one language are found when you ask in another: English, French, Italian, German, Spanish, Portuguese, Chinese, Japanese, Korean, Arabic, Ukrainian and Russian.
- The encoder downloads with your first model instead of shipping inside the app, which is now a 10 MB download.
Sharing
- Sharing an answer or a conversation as a PDF now works with Signal, WhatsApp and other apps, not only Mail.
Settings
- Assistant, Models and Voice say less and do the same. Tap a model to switch to it, then delete the one you left.
- The first download screen names the model, its size and the two small helpers that come with it, with a link to each.
Fixes
- Cancelling a download no longer loads the model you cancelled.
- A download started while a helper was still arriving no longer shows the wrong progress.
- A device whose graphics chip cannot run the models says so before downloading anything, and a model that fails to prepare offers a report you can copy.
The developer, Dmitry Kuznetsov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Dmitry Kuznetsov
- Size
- 14.9 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- Copyright
- © 2026 Dmitry Kuznetsov