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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It uses service workers to cache static files, by the time it opens up you already free to be offline, try toggle network switch to verify.
It has download link at bottom of the about page ([accdoo.app/about]) which you could then self host it by dropping into any static hosting services.
btw, the Pi feature was by-product from the original App but I won't expand here, if you'd like to learn more, please checkout its two Show HN post (39115559 and 39138957) previously.
[wiki]: https://en.wikipedia.org/wiki/Chudnovsky_algorithm
[quickjs/pi]: https://bellard.org/quickjs/pi.html
[pi_bigint.js]: https://github.com/bellard/quickjs/blob/master/examples/pi_b...
[accdoo.app/about]: https://accdoo.app/about#releases
[39115559]: https://news.ycombinator.com/item?id=39115559
[39138957]: https://news.ycombinator.com/item?id=39138957