{"about":{"summary":"A directory of side businesses that real people say they run, each summarized in our words and linked to its public source.","notes":["Sources are public, first-person accounts: interviews, podcasts and community threads.","Cost, time and the other tags are machine estimates, each with a confidence score.","Income figures are the owner's own claim. We don't verify them."],"how_to_cite":"Link the idea page and its source. Call income figures the owner's unverified claim, and cost and time estimates."},"idea":{"slug":"educational-3d-and-4d-geometry-iphone-app-604e06","title":"Educational 3D and 4D geometry iPhone app","summary":"Built an iOS app that teaches what a tesseract is and lets users manipulate it. People keep buying it in a small niche.","url":"https://allsidehustleideas.com/ideas/educational-3d-and-4d-geometry-iphone-app-604e06","markdown_url":"https://allsidehustleideas.com/ideas/educational-3d-and-4d-geometry-iphone-app-604e06.md","tags":{"category":{"value":"software","label":"Software and apps","confidence":0.94},"earns_from":{"value":"one-time","label":"One-time sales","confidence":0.95},"startup_cost_estimate":{"value":"1k-10k","label":"$1k to $10k","confidence":0.51},"time_estimate":{"value":"hands-off","label":"Hands-off","confidence":0.9},"where":{"value":"online","label":"Online","confidence":0.97},"needs_coding":{"value":true,"confidence":0.99}},"owner_reported":null,"source":{"publication":"Hacker News","title":"Your best passive income? (2014)","url":"https://news.ycombinator.com/item?id=7094567","person":"drewolbrich","host":null,"date":"2014-01-21"},"owner_site":"https://itunes.apple.com/us/app/the-fourth-dimension/id504201783?mt=8"}}