Your agents.
Your machine.
Your move.

Meet Lemon. A local-first AI assistant that brings your models, tools, and conversations together — and keeps useful context close.

Get started Explore the code

Self-hosted. MIT licensed. Built on Elixir / OTP.

A LITTLE RUNTIME. A LOT OF POSSIBILITY.

⌘ Terminal▣ Browser↗ Chat

lemonYOUR LOCAL RUNTIME

SessionsToolsMemory

✳

The models you chooseConnected through your providers

LOCAL STATE. CONNECTED INTELLIGENCE.

Durable sessionsNative subagentsProvider choiceSupervised execution

FROM A PROMPT TO A PRACTICE

Good work deserves
a place to continue.

One runtime for the things an assistant needs beyond its next answer.

01 /

Context that stays with you.

Return to durable sessions, search useful memory, and turn repeatable workflows into skills. Keep your project conventions close to the work.

Explore memory

02 /

More than one pair of hands.

Delegate to native subagents in the same runtime, or send work to a named execution node. Coordinate the work from one conversation.

Meet the runtime

03 /

Your choice of model.

Configure providers and models through one platform. Keep files and runtime state on your machine while using the model providers you choose.

Set up your provider

04 /

Built to be understood.

Inspect runs, validate configuration, diagnose setup, and back up durable state. Real tools for the work after “hello world.”

See the support tools

SOLID FOUNDATIONS. FRESH POSSIBILITIES.

Agents are a
concurrency problem.

Tools run. Messages arrive. Sessions wait. Work gets delegated. Lemon uses the BEAM's lightweight processes and supervision to give that activity a structure you can reason about.

Why we built on the BEAM

PICK YOUR STARTING POINT

Make something happen.

USE LEMON

Your first real conversation.

Install, connect a provider, start a chat, and come back to the same session.

Follow the quickstart BUILD WITH LEMON

Make it your own.

Explore the agent stack, create reusable skills, and build on the control plane.

Build your first agent EXPLORE LEMONSIM

Put agents to the test.

Run deterministic, event-sourced simulation worlds with replay verification.

Explore the benchmark arena

BUILT IN THE OPEN

Early days.
Real building blocks.

Lemon is pre-1.0 and evolving. Start with the supported install path, explore the documented capabilities, and help shape what comes next.

Install Lemon Capabilities & boundaries

Find your way around Lemon

Lemon is an open-source, local-first AI assistant platform for developers and technical operators. The supervised Elixir / OTP runtime connects durable sessions, memory, skills, tools, provider routing, and native multi-agent execution. Start in the terminal, use the browser, or connect a chat channel. LemonSim adds deterministic, replay-verified simulation worlds for evaluating agents.

Quickstart · Installation · Browser guide · Configuration · Architecture · Support · Documentation index

Your agents.Your machine.Your move.

Good work deservesa place to continue.