perseus

Perseus is Khan Academy's exercise question editor and renderer.

Developer Tools Learning & Reference

Explore on GitHub Read Hacker News discussions

6Distinct people

13Mentions

0Explicit recommenders

1.6KGitHub stars

REPOSITORY AT A GLANCE

What to know before exploring

What it is

Perseus is Khan Academy's exercise question editor and renderer.

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

khan/khan-exercises · linked in 2 of the same discussions

Mentioned in the same Hacker News threads. That is not proof they are substitutes.

This week on Hacker News

Nov 8–Nov 15 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/15/2026, 9:28:18 AM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year13 dated mentions

Observed mentions: 2013-06-05 17:27:56 UTC to 2017-05-23 16:55:33 UTC.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges

UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
Period	Start (UTC)	End (exclusive, UTC)	Mentions	Comments
2013	2013-01-01 00:00:00 UTC	2014-01-01 00:00:00 UTC	1	1
2014	2014-01-01 00:00:00 UTC	2015-01-01 00:00:00 UTC	8	8
2015	2015-01-01 00:00:00 UTC	2016-01-01 00:00:00 UTC	2	2
2016	2016-01-01 00:00:00 UTC	2017-01-01 00:00:00 UTC	1	1
2017	2017-01-01 00:00:00 UTC	2018-01-01 00:00:00 UTC	1	1

What Hacker News says

1 sources

spicyj·Jun 5, 2013

React is awesome. This weekend, I rewrote the Khan Academy exercise editor which looks like this: https://s3.amazonaws.com/uploads.hipchat.com/6574/26709/htv8... (The right side is a live preview of what's on the left. The editor is open-source https://github.com/Khan/perseus but not yet documented, sorry.) React made the code about 15% shorter and also made an order-of-magnitude improvement because it's smarter than I was being about figuring out what's changed and when it's necessary to touch the DOM. Of course, I could've made the same perf improvements by hand but it was easier and quicker having a library that just handles everything. (This comment sounds a little like I'm getting paid to write this. I'm not! Just really hope that React takes off.)

In Why did we build React?