Think, write, explore.
Chat with Otter 4.11, switch to Cide for coding experiments, or attach a document. Model inference stays on your device; web search sends search terms online.
Start a conversationCode with a team of
AI agents on your side.
Kelus is a free desktop IDE where AI agents write, test and double-check your code, a coach teaches you as you build, and a local AI can even use your computer for you.
Made by Kelus · Kani Otter 4.11
A model of our own.
A model of our own.
A space for your questions.
Meet Kani, our experimental language model trained from scratch. Chat, ask about code, or practise English in a dedicated space that runs the model on your device.
206M parameters · Browser inference · No sign-up needed to chat
Small model. Still learning.Find your words.
Train English gives feedback on your writing. Speak English lets you practise out loud with grammar and pronunciation coaching.
Open English practiceTake Kani with you.
Get the latest Android release from GitHub, with local chat, language learning and in-app update checks.
Download Android APKYour pocket companion.
The iOS build is available to sideload. Get the unsigned IPA and installation instructions on the download page.
Get the iOS buildKani is experimental and can give incorrect answers. The Kelus 0.2.0 desktop preview bundles the same Otter 4.11 weights for local chat.
What's inside
Everything you need to build,
Everything you need to build,
and to learn how.
Kelus Agent
A debate before every change
A Coder proposes, a Tester runs your tests, a Reviewer checks the requirements, and a Judge decides on the evidence. Nothing touches your files until you approve it.
Computer control · Beta · Mac
It can use your computer
Ask “open YouTube and play lofi” and Kelus clicks and types for you. It runs on a free AI model on your own Mac, so no API key and no cost.
Coach
Learn while you build
Stuck? The Coach explains your code in plain words. Start a course and it builds interactive lessons you run right in the editor.
Quick Open
Find anything with ⌘P
Jump to any file by typing part of its name, run any command with >, or go to a line with :.
Extensions
Make it yours
Install thousands of color themes, file icons and snippets from Open VSX, the free VS Code extension store.
Live Share
Code together, live
Share a code and a friend joins your project. You both edit the same files at the same time, with nothing to set up.
Cloud
Your projects, anywhere
Sync a project to a private repo on your own GitHub, then edit it in the browser with the Web IDE from any computer.
7 languages
Speaks your language
The whole app works in your language.
Coming soon
Meet Kel: easy to write, fast to run
A beginner-friendly language with clean { } code and mistakes that explain themselves. It compiles to WebAssembly, so it runs about as fast as C, right in your browser.
fn main { let name = "Kel" var score = 0 repeat 3 { score += 10 } say "Hi {name}! Score: {score}" }
Download
Get Kelus. It's free.
Pick your computer, or paste one line into your terminal.
macOS
curl -fsSL https://kelus-ide.pages.dev/install.sh | bash
Windows
irm https://kelus-ide.pages.dev/install.ps1 | iex
On Windows, if you see “Windows protected your PC”, choose More info → Run anyway. Kelus isn't code-signed yet.
Start building with Kelus
Free forever for your own projects.