Whitespace.
See who already built your idea — and the space they left open.

CLUSTER STUDY-CHECK-CODE · 4 ENTRIES · EARLIEST ENTRY 2026-02-20

QR study accountability apps

This cluster consists of web and mobile apps that use QR codes for participant check-ins and accountability stakes in study or event settings. The dated history is too thin to read a shape from, predating the index or with undated members. study_stake leads on traction signal with 1 star of activity.

Entry timeline

ENTRY TIMELINE

FEB 2026: 3SEP 2026: 1
FEB 2026SEP 2026

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 · 3 ai-built · 1 unlabelled

Operator · 3 hobby · 1 unlabelled

Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 4 listed below. Unlabelled means nothing has decided yet — not that the answer is small.

  1. 01britishcouncil0★1 molivehobbyEducation and assessment web app that verifies score reports by scanning QR codes to load results from a database.
  2. 02study_stake1★8 mostale—ai-builthobbyApp that tracks participant check-ins via phone QR code scans and commitment stakes for study sessions or events.
  3. 03Study_Stake0★7 mostale—ai-builthobbyWeb app that lets study group participants check in via QR code and track accountability stakes for their study sessions.
  4. 04study_stake0★8 mostaleliveai-builtWeb app that tracks study session commitments with staked accountability and lets participants check in by scanning a QR code.

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.