CLUSTER PROGRAMMING-CHALLENGES-CODING-2 · 21 ENTRIES · EARLIEST ENTRY 2025-11-01
Competitive coding judge platforms
This cluster consists of web platforms for solving programming challenges with automated judging, including competitive features like contests, duels, and ratings. Dated entries appear in Dec 2024, Nov 2025, and May 2026 with 1, 2, and 2 members respectively, a sparse pattern with no clear growth trend. OJ_Insight leads on traction with 59 stars, while CampusCode has 2 and another member has 1.
Entry timeline
ENTRY TIMELINE
Each bar is the month a member carries, which is a creation date where the source published one and a crawl date otherwise. Nothing in the index was found before 11 August 2026, and coverage broadened sharply on 14–15 August, so a bar from then on reports how much we found that month, not how much was built; an earlier bar reports how far back a member's own source dated it — not how long we have been watching.
Members by activity
Activity signals, not revenue.
Build origin · 1 unlabelled
Operator · 1 unlabelled
Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 1 listed below. Unlabelled means nothing has decided yet — not that the answer is small.
- 21Sandbox Arena — reproducible cloud sandbox trials0★unknownliveWeb app that lets users compare cloud code-execution sandboxes in live head-to-head races and rank providers by objective metrics and crowd Elo.
Ranked by traction, highest first, and paged 20 at a time — this is a window on the cluster, never the whole of it. Ties are broken by a stable id so a product cannot appear on two pages or fall between them. Browse every cluster.