How To Use hk3k
Get started with your AI-powered second brain in minutes
hk3k is a web app — no install needed. Sign up at app.hk3k.ai and you're ready in 30 seconds. Here's what to do first.
Getting Started
Sign up at app.hk3k.ai
Create a free account with email/password or Google. No credit card, no install, no extension to pin. Takes about 30 seconds.
Open hk3k →
Sign up in 30 seconds
Meet Barnaby & have your first conversation
Barnaby is your optional AI butler — he makes conversations feel more natural and learns your context as you chat. Type anything, ask anything. Your response comes with sources, relevant notes, and the model used. You can turn Barnaby off any time if you want cleaner responses.
Barnaby greets you and suggests starting points
Rich AI responses with sources and linked notes
Create your first Space
Spaces are how hk3k organizes everything — one Space for each project, client, or topic. Each Space holds conversations, notes, tasks, files, and even websites, all in one tree. Click + New in the sidebar to create one, or use the default General Space.
Each Space is its own organized tree
Build a website from a single sentence 🌟
This is the fun part. In any conversation, tell Barnaby: "Build me a landing page for a dog-walking business." He plans the pages, writes the copy, sources appropriate imagery, and publishes the site live at yourname.hk3k.ai. Then keep chatting to tweak it: "make the header cyan, add a testimonials section."
Describe a site, get a published site — in one conversation
Bring your existing knowledge in
Import ChatGPT and Claude conversations (500+ at a time), connect your Notion workspace, or upload PDFs, Word docs, Excel files, and CSVs. Everything is auto-organized, tagged, and searchable — the AI starts personalizing to you immediately.
Import once — your AI personalizes forever
Set up Telegram & scheduled tasks
Connect @hk3k_bot on Telegram to chat with your second brain from any phone. Set up scheduled tasks with recurrence — Barnaby can ping you proactively when things are due, right on your phone.
Your second brain, in your pocket
Pro Tips
Let Barnaby do multiple things at once
Chain actions: "Create a Space for my bakery project, add a task to call the supplier tomorrow, and draft a launch announcement note." The agent performs all three and gives you a receipt you can undo.
Connect a custom domain
Any hk3k-built site can run on your own domain. Set the domain in site settings, point DNS, and hk3k auto-provisions TLS. Your URL, your brand.
Use privacy mode for sensitive chats
In the gear menu, switch Barnaby to No Long-Term Memory or Full Privacy for conversations you don't want stored or personalizing future responses.
Search across all your Spaces
Toggle All Spaces on the sidebar to find that note from three projects ago. The AI searches across everything you've saved.
Undo any agent action
Every agent receipt has an undo button. Barnaby created the wrong thing? One click reverts the entire batch. Experiment freely.
Pick the right AI model
Gear menu → Model lets you switch between Gemini, GPT-5, and Claude — each has different strengths. Complex reasoning? Try Claude or Gemini Pro. Need speed? Use Flash Lite.
Ready to Get Started?
Sign up free and start building your second brain today.
Have questions? Check out our FAQ or contact us