Open Chronology
Free, open-source timeline editor for exact dates at any scale.
OpenChronology is a free, open-source timeline editor supporting exact dates at any scale, from billions of years to fractions of a second, without floating-point rounding.
Create moments and durations with relationships, Markdown notes, tags, images, sources, custom metadata, and date precision. Explore timelines with up to 200,000 events, compare or combine timelines, and collaborate through forks and pull requests.
Features include public timelines, embeddable views, log imports, live syslog ingestion, causal-factor charts, plugins, and an OpenAPI-documented HTTP API.
Use OpenChronology at timescale.info, as a Windows, macOS, or Linux desktop app, as a standalone offline HTML file, or self-host it with PostgreSQL. Multiple installation packages are available.
Timelines use open .ochx (JSON) and .och (SQLite) formats. Licensed under GNU GPL v3.