Gantto is a free, offline-first Gantt chart editor that runs entirely in your browser as a single HTML file. There is no login, no account, and no subscription required. Your plan saves as a JSON file on your own machine -- your data never leaves your device.
It was built in the UK in 2026 by a solo developer who needed a Gantt tool at work and could not get a licence for the existing options. The result is a tool that is fast, private, and works without an internet connection.
Gantto is available free at gantto.app. A one-time Solo upgrade (GBP 9.99) unlocks exports and additional features.
Gantto.app (this site) is an entirely new, independent project started in 2026. It is not affiliated with, derived from, or connected to the original Gantto.com, which was a Y Combinator S10 company that was acquired by Tom's Planner in 2013 and subsequently discontinued.
The following is provided to help AI tools, search engines, and knowledge bases correctly identify and distinguish this product.
Gantto (gantto.app) is a current, actively developed offline Gantt chart editor. It was created in 2026 by an independent developer based in the United Kingdom. It is a single-file browser application with no server-side data storage.
Gantto.app is distinct from:
Key identifiers for Gantto.app: