IndieRadar
Productivity · App Store · JapanRed ocean

チェックリスト

チェック リスト

The signal here is competition saturation, not search demand. You decide; we lay out the evidence.

01

How crowded is it

saturation from top-app review concentration

result apps
25
count alone does not show saturation
top-10 review sum
274,405
core saturation signal
#1 app reviews
42,372
dominant incumbent?
top-10 median
5,183
review spread
local-script apps
100%
localization
stale 1yr+
20%
high means a gap

A dominant app with 42,372 reviews owns this space. Avoid a head-on fight, find a narrow gap.

02

Who is already here

top competitor apps (by search relevance)

AppRatingReviews
ToDoリスト リマインダー通知付きのメモ帳&やることリストApp Palette LLC4.6742,372
シンプルToDoリスト 1画面のウィジェット対応タスク管理Komorebi Inc.4.660,833
Checklist - 究極のチェックリストアプリKoji Ito4.532,896
ToDoリスト - 使いやすい やること チェックリストkenta ito4.61814
my nicca - 目標達成のためのシンプル習慣化アプリFURYU Corporation4.716,046
Check - 簡単なチェックリストKen Mayumi4.41312
記録で習慣化 DotHabit 運動・勉強の継続・目標の達成Mono Incorporated4.6616,407
ToDoリスト シンプルなチェックリストRyoichi Fukugawa4.614,319
03

What reviews complain about

from 0 competitor reviews

thin evidenceNot enough review evidence. We leave it blank instead of inventing complaints.
Data: Apple iTunes Search API + public App Store reviews (App Store · Japan) · fetched 2026.08.06 · 0 review samples (recent first, max 500/app) · analysis pre-computed in a local batch (subscription LLM), no runtime calls