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

CLUSTER MATH-DISTRACTING-BLOCKS · 6 ENTRIES · EARLIEST ENTRY 2025-07-28

Math-challenge app blockers

This cluster consists of mobile apps that block distracting apps and require users to solve math problems or cognitive challenges to unlock them, with adjustable difficulty and temporary unlock passes. Dated entries before the index start appear sporadically from June 2025, with the largest concentration in June 2026 (5 entries). Zenvi - Earn Your Screen Time leads on traction, followed by ProcrastiLearn and Blob: Screen Time Control, though all have zero stars.

Entry timeline

ENTRY TIMELINE

JUN 2025: 2JUL 2025: 1SEP 2025: 1JUN 2026: 2
JUN 2025JUN 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 · 6 unlabelled

Operator · 2 open source · 4 unlabelled

Two labels per entry, never collapsed into one: how it was built, and who stands behind it. Counted over the 6 listed below. Unlabelled means nothing has decided yet — not that the answer is small.

  1. 01ChessLock: Screen Time Control0★1 moliveiOS app that blocks distracting apps during focus sessions and requires solving chess puzzles to earn a pause.
  2. 02Screen Time Control: Pause0★1 moliveMobile app that requires solving a puzzle before opening distracting apps, unlocking them for a short period to encourage deliberate use.
  3. 03Zenwell: Stop doomscrolling0★1 moliveopen sourceAndroid app that blocks distracting apps during scheduled times and requires solving math problems or breathing exercises to unlock them.
  4. 04PlugBrain0★11 mostaleliveopen sourceApp that blocks distracting apps at set times and requires solving math challenges to regain access, adjusting difficulty based on usage frequency.
  5. 05BrainTime | Earned Screen Time0★1 yrabandonedliveMobile app that blocks distracting apps and unlocks them only after answering educational questions to earn screen time.
  6. 06Math Attack: Kill Screen Time0★1 yrabandonedliveMobile app that blocks distracting apps until the user solves a math problem, with adjustable difficulty and automatic re-locks.

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.