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sweet

Spreadsheet for Holochain
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How you run it
In Moss
Holochain version
0.6.0
Activity
active
Checked
14 September 2026

What is sweet and does it work?

sweet is a Holochain app for collaborative spreadsheets, with its latest release, v0.10.6, dated 2026-05-13 and its last code push on 2026-09-08. We read its README and the v0.10.6 release notes to confirm what it is and that it is actively maintained.

sweet is a Holochain app for collaborative spreadsheets, made by Lightning Rod Labs. Inside the repository the project is called Calcy. It gives agents real-time collaboration, delivered by syn, Holochain's library for shared state. The project is actively developed: the latest release, v0.10.6, was published on 2026-05-13, and the last code push was on 2026-09-08.

The code is a Holochain app (hApp). Its manifests use the Holochain Development Kit (HDK) version 0.6.0, and the user interface uses the Holochain client library version 0.20.2. The software is MIT-licensed, as noted in the LICENSE file in the README, and is packaged as a web hApp so it can be installed in the Holochain Launcher.

To run it yourself, the README documents building a packaged calcy.webhapp and installing it through the Holochain Launcher, plus local development and test commands that run inside a nix shell. The v0.10.6 release notes list the ability to import from CSV and responsiveness improvements for large spreadsheets.

How to get it

moss-tool

  1. Enter the nix shell and install dependencies: run nix develop, then npm install.
  2. Build and package the web hApp: run npm run package.
  3. Install the resulting calcy.webhapp from the workdir folder in the Holochain Launcher.

Source: https://raw.githubusercontent.com/lightningrodlabs/sweet/HEAD/README.md

Questions people ask

What is sweet?
A Holochain app for collaborative spreadsheets, built by Lightning Rod Labs and called Calcy inside the repository. Real-time collaboration is delivered by Holochain's syn library. source
Does it work?
The project is in active development: its last code push was on 2026-09-08 and its latest release, v0.10.6, is dated 2026-05-13. source
What Holochain version does it use?
The project's manifests specify the Holochain Development Kit (HDK) version 0.6.0. source
How do I install or run it?
Enter the nix shell, run npm install, then npm run package to build the calcy.webhapp, which you install in the Holochain Launcher. source
Can I run multiple agents?
Running npm start launches a network of two agents with their UIs, and npm run network bootstraps a custom network, for example with AGENTS=3. source
Where does it run?
It is packaged as a web hApp that is installed in the Holochain Launcher desktop app. source
What changed in version 0.10.6?
The release adds the ability to import from CSV and improves responsiveness in large spreadsheets. source

From 3 public sources, checked 2026-09-13.

Try sweet

  • Code on GitHubOpen on GitHub ↗Last change 8 September 2026.
  • Releasev0.10.6Published 13 May 2026.
  • In MossInstalled inside Moss as a tool.
Project details & sources

Checked 14 September 2026

Compatibility

hdk
0.6.0
hdi
0.7.0
holochain-client
0.20.2
happ.yaml
present
web-happ.yaml
present
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