Ultra-portable Gantt chart tool for very regulated environments
I work for government agency with a lot of security considerations. We can't install anything and using public webapps is out of the question. Going through clearance or procurement to buy or install something is a pain. I needed a project management tool, and what we had on offer was too clunky and old. I built SimpleGantt to be ultra lightweight and portable. It's one HTML, one Javascript and one CSS file. Each project is saved into a single .yaml file. If you have a SharePoint environment you can "host" it by uploading the repo to SharePoint after renaming simplegantt.html to…
Ultra-portable Gantt chart tool for very regulated environments launched on January 9, 2025 with 115 votes, #359 of 6,141 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
SimpleGantt is a lightweight Gantt chart tool designed for highly regulated environments where software installation and cloud-based tools are restricted. Built as three files—HTML, JavaScript, and CSS—it requires no installation and stores projects in YAML format. The tool is ideal for government agencies and organizations with strict security requirements, and can be hosted on SharePoint by renaming the main file. It offers an alternative to outdated project management solutions while maintaining compatibility with secure, air-gapped systems.
written from the facts on this page · September 2026
From the sources
Gantt charts with only Javascript, CSS, HTML and YAML - aerugo/simplegantt
SimpleGantt is a lightweight project management tool designed for environments where software installation is restricted and cloud web applications are not permitted. It runs entirely in the browser. SimpleGantt requires a modern web browser with support for HTML5 and JavaScript. It has been tested on the latest versions of Chrome, Firefox, and Edge. It also depends on a number of third-party libraries which are pulled in via CDN. See the simplegantt.html file for the list of dependencies. Simply open the simplegantt.html file in your web browser to start using SimpleGantt. No servers or installation required. Project files are saved locally in .yaml format. Many enterprise environments…from github.com
In the maker’s words, at launch
I work for government agency with a lot of security considerations. We can't install anything and using public webapps is out of the question. Going through clearance or procurement to buy or install something is a pain. I needed a project management tool, and what we had on offer was too clunky and old. I built…
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