The UsefulShelf journal
Practical notes on launching your app, getting discovered, and choosing useful software.
Reach people looking for their next useful tool. One labeled card, $99 for 30 days, no renewal.
Idea validation
Three specific problems to investigate, the questions to ask, and a small test for each. A research method, not a list of supposedly profitable ideas.
September 28, 2026·5 min read
