"A simple yet an effective idea, local second-hand deals can save money and cut waste. The tricky parts are trust and convenience: people worry about spam, an d safety. If you add simple features like verified photo or even ratings it would be better."

"Great idea that tackles a real problem and gives users more control online. The main challenges are privacy and accuracy , how you handle data safely and avoid hiding harmless posts or context . If you keep most processing on device, explain your…"

"The idea behind SubTrack is strong and clearly solves a real issue with forgotten subscriptions . However , since similar apps already exist, it might face challenges standing out in the market. To make it more unique, you could emphasize data…"