A private workspace on every new tab

Your new tab, actually useful.

Seventeen focused tools — notes, PDFs, a whiteboard, voice-to-text, on-device AI and more — the moment you open a tab. Everything runs in your browser, so nothing you write, say, or scan ever leaves your machine.

Get started freeSee the apps

Free tier forever · Pro from $10/mo · No account needed to start · Works in Chrome

New Tab
A KimtOS new tab: a large clock, a search bar, and a dock of app icons over a dark wallpaper.A KimtOS new tab: a large clock, a search bar, and a dock of app icons over a light wallpaper.
An actual new tab. The dock holds every tool — one click away.
Founding offer

The first 500 to sign up get a full year of Pro — free.

Claim a founding-member account and Pro is on us for 12 months — every on-device tool unlocked. No card, cancel anytime.

Claim your Pro year
17tools in one tab
0servers your data touches
0trackers, ads or accounts
100%runs on your device

Seventeen tools. One tab.

Each opens in a draggable window from the dock. Eight essentials are free forever; the nine Pro tools — including everything powered by an on-device AI model — come with a subscription.

Free forever Pro

Tabs

Free

Fuzzy-find and switch any open tab, hibernate idle ones to free memory, and save sessions.

⌘K tab finder

Tabs

Free
  • ⌘K fuzzy-search every tab
  • Hibernate idle tabs to free memory
  • Save & reopen tab sessions
⌘K tab finder

Voice to Text

Pro

Transcribe recorded or uploaded voice notes. The audio never leaves your device.

Whisper · WebAssembly

Voice to Text

Pro
  • Whisper, running in the browser
  • Record live or upload a clip
  • Your audio never leaves the device
Whisper · WebAssembly

Books & Notes

Free

Notion-style notes in collections, with live preview, export, and internal links.

Markdown

Books & Notes

Free
  • Markdown with live preview
  • Collections & internal links
  • Export as a book or PDF
Markdown

KimtAI

Pro

A private AI chat that runs in your tab — and can drive your other apps as tools.

On-device LLM · WebGPU

KimtAI

Pro
  • A real LLM, running in your tab
  • Calls your other apps as tools
  • Not a single token sent to a server
On-device LLM · WebGPU

PDF Library

Free

Read and annotate PDFs — highlights, notes, zoom, and last-page memory.

PDF.js

PDF Library

Free
  • Highlights & margin notes
  • Remembers your last page
  • Import by URL or upload
PDF.js

We can’t see your data.
Neither can anyone else.

Most “AI” tools quietly ship your notes and recordings to a server. KimtOS does the opposite: the models run inside your browser tab with WebAssembly and WebGPU. There’s no backend to leak, subpoena, or get breached — because there isn’t one.

— Built for people who’d rather not find out the hard way.

  • Nothing is uploaded

    Transcription, OCR, denoising and chat all happen locally. The network isn’t in the loop.

  • You keep the files

    Everything lives in your browser’s storage. Export a portable backup anytime — it’s yours.

  • Works offline

    Models download once, then cache. After that, pull the plug and everything still works.

  • No account to start

    Install, open a tab, go. You only sign in when you choose to subscribe to Pro.

Simple pricing. Try everything first.

Free forever, or go Pro for the smart tools. The first 500 to sign up get a full year of Pro, free — keep it or drop to Free after, your data stays either way.

Free

The essentials, forever

$0always
Get started free
  • Calculator & TodayTodo
  • Books & Notes — Markdown, collections, export
  • PDF Library — read, highlight, annotate
  • Tabs — ⌘K fuzzy finder, hibernate & sessions
  • AnubisDB — your on-device data vault
  • Developer Toolbox — JSON, JWT, hashing & more
  • Rotating 4K wallpapers & home widgets
  • 100% on-device · unlimited use
First 500 · 1 year free

Pro

Every smart tool, unlocked

$10/ month
Claim your Pro year
  • Everything in Free, plus all nine Pro apps, including:
  • KimtAI — private on-device AI chat & agent
  • Voice to Text · Image to Text (OCR)
  • Denoise · Video Recorder (screen + camera)
  • NotaBoard — infinite whiteboard canvas
  • Grammit · Rewordit · Thoth (on-device AI)
  • Every new tool we ship, included

Cancel anytime · your data stays yours

Available onChrome

Questions, answered.

Is my data really private?

Yes. The AI models run inside your browser tab — there’s no KimtOS server that sees your notes, audio, images or chats. The only network calls are optional (weather, importing a PDF by URL) and the one-time model download.

How does the founding-member offer work?

The first 500 people to sign up get a full year of Pro — every tool unlocked, free, no card. After the year you keep Pro for $10/month (or $100/year), or do nothing and drop to the Free tier. Either way your files stay put — the free apps keep working and your data is never deleted or held hostage.

What’s the difference between Free and Pro?

Free covers eight everyday tools — Tabs, Calculator, Developer Toolbox, TodayTodo, KimtFS, Books & Notes, PDF Library and AnubisDB. Pro unlocks the other nine — the on-device AI apps (KimtAI, Voice to Text, and more) plus the NotaBoard whiteboard.

Do I need an account?

Not to start. Install the extension and use the free tools with no sign-up. You only create an account when you go Pro or subscribe.

Which browsers are supported?

Chrome today. Firefox, Edge and Safari are on the roadmap, and a native desktop app for Windows, macOS and Linux is coming after that.

Can I cancel anytime?

Anytime, in one click. Your free tools keep working and your data is never deleted.

Take back your new tab.

Every tool, on your device. Free to start — no card, no catch.

Get started free