Mosaik
Join the waitlist

Early access is opening soon

Every piece of the work,
set into one picture.

Mosaik is the universal AI app. Chat, projects and a coding agent in one fast, local-first desktop window that does what you tell it.

One window for asking, making and coding.

Mainstream chat apps decide how the model behaves, and a quick side question derails the work you were doing. Mosaik fixes both.

Chat

Any model, answers that read well.

Stream from any model on OpenRouter, with per-chat overrides for the model, system prompt, temperature and output limit. Web search works like a researcher, free and without an account, and every paragraph shows which source it rests on.

  • Ctrl K searches every conversation, titles and bodies
  • A prompt library of named, reusable system prompts
  • Branch any answer, export to Markdown or JSON, watch cost as you go
A conversation in Mosaik, dark theme A conversation in Mosaik, light theme
Quick-ask

Side questions stay on the side.

Select words in any message and ask about them in a popover beside the chat. The answer knows the conversation but is never added to it, and a side conversation worth keeping opens as a chat of its own.

  • Ctrl Shift K from any selection
  • Your main thread stays exactly where you left it
Quick-ask popover beside a chat, dark theme Quick-ask popover beside a chat, light theme
Code

A coding agent on your real project.

It searches, reads, edits and runs your tests, reads its own diff back before it reports, and iterates on what fails. Every turn is checkpointed, so a turn or a single file can be undone, with or without git.

  • Fast, Standard and Deep tiers, each with a model you choose
  • A command policy that asks before anything installs or deletes
  • Plans you approve, and a branch per session
Coding agent settings with model tiers, dark theme Coding agent settings with model tiers, light theme

What are we making today?

A mosaic is a project of any kind: a book, an app, a workshop, a hobby. Describe it in a sentence and Mosaik drafts the brief with you, splits the work into pieces, and keeps every piece of it together.

The Mosaics home page with project cards, dark theme The Mosaics home page with project cards, light theme
Writing

A manuscript that keeps its story straight.

Ordered chapters, a story bible every draft keeps to, your own voice, and continuity checks that arrive as tracked edits. Export to Word, PDF or EPUB.

Research

Runs you watch and steer.

Review the plan before anything is searched, see every page it reads, and get reports with numbered citations and how each one was found.

Art

Characters who stay the same person.

A style locked for the whole mosaic, painted-region edits, variations and a gallery that remembers the exact prompt behind every picture.

Crew

Specialists, side by side.

The lead splits larger work into a plan you approve once, with its spending cap in view. Every result waits for you to accept, decline or redo.

A quiet room with one warm thing in it.

Mosaik is built to be sat in all day.

You decide how it behaves

Your instructions win over Mosaik's own. Model, prompt and limits are yours to set, per chat or for everything.

Local-first

Chats, projects and settings live in a database on your machine. Your API key is kept in the operating system's credential store, never in logs.

Every model, one key

Bring an OpenRouter key and reach the models you want. Mosaik shows what each turn cost as you go, and spending limits keep it there.

Nothing runs away from you

Plans wait for approval, edits are checkpointed, and proposed tasks and memory wait for you to accept them.

Get early access.

Mosaik is in early preview. Join the waitlist and we'll send you an invitation as soon as a place opens up. No spam.

What would you use it for? optional

Questions

What is Mosaik?

A desktop app that puts chat, projects and a coding agent in one window. It is built for people who use AI every day and want control over how it behaves, without side questions derailing the work in front of them.

Which models can I use?

Any model available on OpenRouter. You connect your own OpenRouter key, pick a default model, and can override it for a single chat or a coding tier.

Where does my data live?

On your computer. Conversations, projects and settings are kept in a local database, and your API key is stored through the operating system's credential store. Prompts go to the model provider you chose, and web searches go to the search services that answer them.

When can I try it?

Early access opens in small waves. Everyone on the waitlist hears from us in the order they joined.

What will you do with my email?

Only send you your invitation and the occasional note about Mosaik's launch. We don't share it, and you can ask to be removed at any time.