---
title: "Unison Cloud is now open source"
slug: unison-cloud-is-now-open-source
url: https://listedarticles.com/articles/unison-cloud-is-now-open-source
canonical_url: https://www.unison-lang.org/blog/unison-cloud-open-source/
content_type: announcement
language: en
published_at: 2026-10-08T00:00:00.000Z
updated_at: 2026-10-09T17:20:22.443Z
author: "Paul Chiusano"
authored_by: human
publisher: "Unison"
publisher_url: https://www.unison-lang.org/
topics: ["Open Source", "Infrastructure", "Programming", "Announcements"]
license: all-rights-reserved
word_count: 291
reading_minutes: 1
citation: "Paul Chiusano, Unison. \"Unison Cloud is now open source.\" 8 Oct 2026. https://www.unison-lang.org/blog/unison-cloud-open-source/ (all-rights-reserved)"
# The full text follows. The web page shows an extract and sends readers
# to the source above; quote the citation and link the canonical URL.
---

# Unison Cloud is now open source

> Paul Chiusano announces that Unison Cloud, which turns a pool of nodes into a distributed computer programmable in Unison, is now MIT licensed, newly open-sourcing the Nimbus worker node, the Haskell Cloud API server and the Unison Cloud UI alongside the existing client.

# Unison Cloud is now open source

[Unison Cloud](https://unison.cloud) is now open source, MIT licensed. There are four projects:

## What is Unison Cloud?

[Unison Cloud](https://unison.cloud) turns any pool of nodes into a distributed computer, programmable with the Unison language. [See a series of demos](https://www.youtube.com/watch?v=0q6jY58xsKA). Some features:

- Service deploys in seconds. Services are lightweight, < 200kb. No more building and shipping around multi-GB containers.
- Fast, typed, inter-service communication using [adaptive service graph compression](https://www.youtube.com/watch?v=347IbLJ6cfM) .
- Distributed batch jobs, using a high-level fork/join style distributed computing model.
- Transactional storage (backed by DynamoDB) and object storage (backed by S3).
- Secrets management, long-running background jobs, and more.

- The [Unison Cloud client](https://share.unison-lang.org/@unison/cloud) defines the programming model for a Unison Cloud cluster. It includes both a local interpreter (for testing and local development) and the real interpeter that talks to a distributed Unison cluster. This has been open source for a long time.
- [Nimbus](https://share.unison-lang.org/@unison/nimbus) is the worker node for a Unison Cloud cluster. It is written in Unison. The system supports any number of workers, and can be scaled dynamically up or down. This is newly open sourced.
- The [Unison Cloud API Server](https://github.com/unisonweb/cloud-api) is a Haskell service that the Unison Cloud client talks to when interacting with a remote Unison Cloud cluster. It also acts as a control plane for tracking cluster membership, handling authentication, and so on. This is newly open sourced.
- The [Unison Cloud UI](https://github.com/unisonweb/unison-cloud-ui) is the code behind`app.unison.cloud` (for viewing deployed services, logs, and so on). This is newly open sourced.

We think this tech will be more useful to the world as an open source technology and hope that people build great things with it.

If you're interested in professional support for a Unison Cloud cluster, get in touch at the Unison Cloud team ([unison.cloud](https://unison.cloud)).