đź’ˇ SaaS Idea: App Size Sentinel

Android storage growth tracker that monitors per-app storage over time, charts trends, and alerts on anomalous growth with cleanup guidance.

Platform: mobile

Why it's a good idea?

Overview of the idea

App Size Sentinel = Android app that records each installed app’s storage footprint daily, graphs its growth, and sends alerts when an app’s data/cache size rises abnormally. It also offers cleanup tips.

1. Evidence of user pain

  • r/androidapps – post “looking for an app: storage tracking app” (Oct-2022) + multiple replies saying nothing like this exists.
  • r/AndroidQuestions – “How to see which app is increasingly taking up storage?” (Apr-2024)
  • r/help – Reddit mobile app taking 45 GB (Feb-2025) → users manually clear cache.
  • r/firefox – “Android app cache grows” (Dec-2023) → want automatic alerts. These threads show dozens of up-votes and “I need this too” comments – clear qualitative demand.

2. Existing solutions / competitors

Product What it does Gaps
Files by Google One-time scan, recommends files to delete No history, no per-app trend, no alerts
Storage Analyzer & Disk Usage Visual treemap of current storage Snapshot only
SD Maid / CCleaner Cleans junk, shows current app size No historical tracking, mostly optimisation
X-Plore, DiskUsage Treemap explorer No auto-tracki...
Unlock this and 131+ other ideas now