Problem validation – online chatter:

• The exact Reddit thread provided (r/Frugal, Jan-2024) has >300 up-votes and dozens of comments from US shoppers asking for “one app that lets me enter my grocery list and shows which local store is cheapest”. The top comments mention that nothing really works well in the US, only partial solutions such as Flipp or Basket.
• More Reddit posts in r/Frugal, r/groceries, r/PersonalFinance regularly ask the same question (“Best grocery price comparison app?” – search shows 10+ threads in the last 12 months).
• HackerNews search for “grocery price comparison” returns several Show-HN posts (e.g. Grocer.ai, 2022; Trolley, 2020) with decent discussion but complaints about data accuracy.

Keyword data (US):

• “grocery price comparison app” – 1 900 monthly searches, difficulty 24 (<30 → attainable).
• “best grocery price comparison app” – 260 searches, difficulty 24.
• “flipp app” (largest incumbent) – 3 600 searches (people already look for digital-flyer apps). These satisfy the ≥500 search-volume/≤30 difficulty criterion.

Competitive landscape:

• BasketSavings.com / Basket app (USA). Crowdsources prices; rating 3.0 on App Store, last major update 2022...