Open Chronology

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.

Features

Arbitrary-Precision Time
Interactive Timeline Visualization
Event Relationships
Collaborative Timeline Editing
Multiple Timeline Comparison
Custom Event Metadata
Log Analysis and Visualization
Causal-Factor Analysis
Self-Hosting and Offline Support
Open Data Formats and API

Project Samples

Project Activity

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License

GNU General Public License version 3.0 (GPLv3)

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Open Chronology Web Site

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