Download websites that use Epoch

About Epoch

An abandoned dependency works as a clock. Development on Epoch went quiet a long time ago, so a page still loading it is, in effect, timestamped by the choice.

The library was published by Fastly, a content delivery company rather than a charting vendor, and the design follows from that origin. Charts here were meant for live series on dashboards and monitoring screens, where points arrive continuously and the browser has to keep redrawing without falling behind. The implementation is JavaScript, the licence is MIT, and the project appeared in 2014, when operations teams were starting to put their metrics on screens other people could look at.

Where a charting library ends up says a lot about the page carrying it. A site loading a streaming chart component is usually exposing something operational to the public: a status page, a network weather map, a metrics dashboard, a demonstration of a monitoring product, or an internal tool that was never meant to be indexed. Marketing pages do not need charts that redraw several times a second. The audience for this code was engineers who wanted a chart to behave like an instrument rather than an illustration.

As of October 2026 we find Epoch on 19 sites. The population is small and unlikely to grow, which is what makes it interesting rather than what makes it negligible. Detection relies on the library arriving under a recognisable filename or leaving its global object in place, so bundled and renamed builds slip past us, and the count should be treated as a floor.

The obvious use of a list like this is staleness research. A domain still serving an unmaintained visualisation library is telling you roughly when its front end was last rebuilt, and that inference is far more valuable across a whole population than on any single domain. Agencies pitching rebuilds, security teams inventorying unmaintained client side code and researchers studying dependency decay all want the enumeration rather than one answer. Our export gives the matched domains with the rest of each site's detected stack, so the age signal can be joined to hosting, framework and CMS choices before anyone acts on it.