Private AI chat from Germany

One private chat.
Many worlds.

Name: Chuk Chat
Price: 20 EUR

Founders, small businesses, developers, students. They use the same app for very different work. Scroll down. Each world is a real use case.

Download for Mac / Windows / Linux Web App

100% open source · monthly subscription · no token stress

Scroll to begin

01 of 09

The private questions

The questions you would not ask anyone else.

Health, money, a hard talk with your boss. People ask Chuk Chat the things they would never type into a data-hungry AI. Your chats are encrypted on your device before we store them. We keep only ciphertext.

End-to-end encrypted storage
Never used for training
No tracking

Burnout talk with my boss

How do I tell my boss that I am burned out?

Thought for 4s

Start with facts, not with blame.

Ask for 20 minutes at a calm moment.
Say what changed: sleep, focus, sick days.
Bring one clear request, like fewer projects for a month.

Ask me anything !

Fast

You're chatting with an AI/LLM — it can be wrong. Check key info.

What our server stores AES-256-GCM · the key stays on your device

02 of 09

Building a product to sell

From idea to launch page in one chat.

Founders research the market, write the pitch, draft the code and publish a landing page with a public link. Connect GitHub, Stripe or Vercel and work with your real project. Your idea stays your idea. We do not train on it.

Web research
Artifacts with public links
GitHub · Stripe · Vercel

Spoke landing page

Build a landing page for my bike repair service and publish it.

Running create artifactWorked for 12s

Ran artifact manager

Ran create artifact

Spoke landing pageHTML · v1 Download Open

Done. Your page is live, and anyone with the link can open it: https://artifacts.chuk.chat/k7f2-spoke

Ask me anything !

Fast

You're chatting with an AI/LLM — it can be wrong. Check key info.

Spoke landing page HTML PreviewCode

PreviewCodev1

SpokePricesAreasBook

Bike repair at your door.

We come to you. Fixed prices, same-day visits.

Book a repair

Same-day visitsFixed pricesAll brands

Versionv1

03 of 09

Running a small business

The office work, done between two jobs.

A carpenter writes the invoice as a clean PDF on the way to the next customer. A café owner answers emails and plans the shifts. Appointments go straight into the calendar. No IT department needed.

PDF documents
Email drafts
Calendar and reminders

Invoice Mrs Weber

Write the invoice for Mrs Weber: kitchen shelf, 6 hours at €58, material €140. As PDF.

Compiling documentWorked for 6s

Ran typst compile

Invoice Mrs WeberTypst · PDF · v1 Download Open

Now write Mrs Weber a short email about it.

Your invoice 2026-031

To[email protected]

Dear Mrs Weber, thank you for your order. Here is the invoice for the kitchen shelf. Total: €488.00, payable within 14 days. Kind regards, Jan Brandt

Open in Mail App

Ask me anything !

Fast

You're chatting with an AI/LLM — it can be wrong. Check key info.

Invoice Mrs Weber Typst PreviewCode

PreviewCodev1

Brandt Carpentry · Hafenstraße 12 · 24103 Kiel

InvoiceNo. 2026-031

Mrs Weber

Kitchen shelf, labour 6 h × €58€348.00

Material€140.00

Total€488.00

Versionv1

04 of 09

Connecting every tool

All your tools. One chat to drive them.

Knowledge workers connect Notion, Linear, Todoist, Dropbox and 50 more services. You sign in once in the browser. Then you ask in plain words, and Chuk Chat does the clicking across all of them.

50+ connectors (MCP)
Sign in with OAuth
Desktop and Android

This week

What is due this week? Check Linear, Todoist and Notion, then make me a plan.

Running todoist find-tasksWorked for 9s

Ran linear list issues

Ran todoist find-tasks

Searchedlaunch plan

Your week, in order:

Mon: fix the login bug (Linear, high priority)
Tue: send the Q3 report (Todoist)
Thu: review the launch plan (Notion)

Ask me anything !

Fast

You're chatting with an AI/LLM — it can be wrong. Check key info.

05 of 09

Every model, one budget

Stop paying for five AI subscriptions.

Some models write better. Some think deeper. Some are fast and cheap. Power users pick a different model for each message and pay from one budget: €20 per month, with €16 in AI credits included. No second account, no second invoice.

Frontier open-weight models
Switch for each message
€16 AI credits included

Cover letter

Write my cover letter for the office manager job.

Thought for 3s

Dear Ms Berger, I am applying for the office manager position…

Check the salary maths: €4,250 per month, 13 salaries.

Thought for 6s

Correct: €4,250 × 13 = €55,250 per year.

Translate the letter into German.

Thought for 2s

Sehr geehrte Frau Berger, hiermit bewerbe ich mich…

Fast

Thinking

Choose modelKimi K3DeepSeek V4 Pro 0813

ReasoningLow

DeepSeek V4 Pro 0813

Kimi K3

GLM 5.3

Qwen3.8 27B

MiniMax M3

Mistral Small 4

gpt-oss-120b

More models

Ask me anything !

Fast Kimi K3 DeepSeek V4 Pro 0813 Qwen3.8 27B

You're chatting with an AI/LLM — it can be wrong. Check key info.

06 of 09

Many tasks at once

Five chats running. None of them waits for you.

Engineers start a refactor in one chat, a research question in the next and a bug hunt in a third. Answers keep streaming when you switch chats. Code lands in editable panels, and on desktop a sandboxed shell runs commands for you.

Parallel streaming
Code artifacts
Sandboxed shell (desktop)

Pinned2

Load test the new sync APIMon, Sep 21

Team code style guideWed, Aug 12

Today5

Refactor the auth service14:32

Why is the CI build slow?14:28

Migrate to Dart 3.1314:21

Explain this stack trace14:09

Regex for German IBANs13:40

This week23

Flaky login test on CISat, Sep 26

Postgres index for full-text searchSat, Sep 26

Multi-stage Dockerfile for the APIFri, Sep 25

Rate limiter with RedisThu, Sep 24

Kotlin coroutines vs. Dart isolatesWed, Sep 23

Release notes for 2.3Tue, Sep 22

This month41

Set up Sentry for FlutterSat, Sep 19

GraphQL or REST for the admin panelThu, Sep 17

Memory leak in the image cacheMon, Sep 14

Nginx config for WebSocketsFri, Sep 11

New chat Media Search

Lena Hartmann €24.60

Refactor the auth service and run the formatter.

Running bashWorked for 21s

Ran bash

Searcheddart token refresh pattern

auth_service.dartCode · v2 Download Open

I moved the token refresh into its own method and added a retry. The formatter changed 3 files.

Ask me anything !

Fast

You're chatting with an AI/LLM — it can be wrong. Check key info.

07 of 09

The prototyper

From a sketch to a clickable prototype.

Prototypers sketch a flow, turn it into a clickable HTML page and generate the images for it. Each idea takes minutes, not days. Keep the good ones. Delete the rest.

Excalidraw sketches
HTML previews
Image generation

Signup flow

Sketch a signup flow with an email code.

Running artifact managerWorked for 8s

Ran artifact manager

Signup flowExcalidraw sketch · v1 Download Open

Make it a clickable page.

Worked for 11s

Signup pageHTML · v1 Download Open

Add a hero image.

Worked for 5s

Z-Image Turbo

Ask me anything !

Fast

You're chatting with an AI/LLM — it can be wrong. Check key info.

Signup flow Excalidraw PreviewCode

PreviewCodev1

Signup page HTML PreviewCode

PreviewCodev1

Create your account

[email protected] Send code

Versionv1

08 of 09

Research and documents

Talk to your documents. Get answers with sources.

Students and researchers attach PDFs, notes and papers and ask questions about them. Chuk Chat searches the web, names its sources, draws charts and writes the result as a typeset PDF. Old chats stay searchable.

PDF and file attachments
Web search with sources
Charts and PDF export

Survey methods

thesis_draft.pdfmiller_2024.pdf Compare the methods in both papers. Show the response rates as a chart.

Searching the webWorked for 14s

Searchedsurvey response rates by method

nnature.comaarxiv.orgDdestatis.dePpewresearch.org

Both papers measure response rates, but Miller compares four survey methods. In person works best:

Response rate by survey method (%)

70564228140

OnlinePhoneMailIn person

naDP8 sources

Ask me anything !

Fast

You're chatting with an AI/LLM — it can be wrong. Check key info.

09 of 09

On the go

Hold the home button. Ask. Done.

On Android, Chuk Chat can be your assistant. Hold the home gesture, and it listens, reads what is on the screen, answers out loud and acts. It sets alarms, finds places and starts the navigation.

Android assistant
Voice in, voice out
Places, routes, alarms

18:42

Fri, Sep 2514°C

CalendarClockPhotosWeatherNotesFilesSettingsChuk Chat

Pharmacy

Pharmacy at the marketMarktplatz 4Pharmacy · open until 20:00 4.7(128)

Linden PharmacyLindenstraße 21Pharmacy · open until 19:00 4.5(86)

Harbour PharmacyKaistraße 8Pharmacy · open until 18:30 4.4(51)

Navigation startedPharmacy at the market

CHUK CHAT

Thinking …Working …Listening

“Find a pharmacy that is open now and take me there.”

Three pharmacies are open. The closest is Pharmacy at the market, 400 m away. Navigation is running.

Location

Places: Pharmacy

Navigation: Pharmacy at the market

PauseThinking …Working …Pause

What connects them

Nine worlds. One rule:
your chats belong to you.

One thread runs through all of these. Your conversations are the most personal data you create. So they are encrypted on your device, answered by open-weight models and never used for training. No ads, no tracking, run from Germany.

Open-weight models only

Transparent models. You always know what runs your AI.

End-to-end encrypted

Chats are encrypted on your device before we store them.

Made in Germany

Operated from Germany under EU law. GDPR by design.

No tracking, no training

No ads, no profiling. Your data does not train anything.

Comparison

How Chuk Chat Compares

What the mainstream players skip — and where Chuk Chat draws its line.

Feature	ChatGPT	Claude	Okara	Lumo	Chuk Chat
Privacy First
Based in Germany
Based in EU
Open Source
Frontier-Class Models
Open-Weight Models Only
End-to-End Encrypted
Never Trains on Your Data
No User Tracking
GDPR by Design
Platforms	iOSAndroidMacWindowsWeb	iOSAndroidMacWindowsWeb	Web	iOSAndroidWeb	Android Mac Windows Linux Web

Find your world.

€20 per month, €16 of it as AI credits. Web, Mac, Windows, Linux and Android.

Download Chuk Chat Open the Web App

One private chat.Many worlds.

The questions you would not ask anyone else.

From idea to launch page in one chat.

The office work, done between two jobs.

All your tools. One chat to drive them.

Stop paying for five AI subscriptions.

Five chats running. None of them waits for you.

From a sketch to a clickable prototype.

Talk to your documents. Get answers with sources.

Hold the home button. Ask. Done.

Nine worlds. One rule:your chats belong to you.

Open-weight models only

End-to-end encrypted

Made in Germany

No tracking, no training

How Chuk Chat Compares

Find your world.

One private chat.
Many worlds.

Nine worlds. One rule:
your chats belong to you.