Maybe now you should look at sites, not apps, and check out sites that will work offline. Someone could create a training program based on an offline copy of a

Maybe now you should look at sites, not apps, and check out sites that will work offline. Someone could create a training program based on an offline copy of a regex helper site. https://hn.algolia.com/?query=regex&sort=byPopularity&prefix&page=0&dateRange=all&type=story https://hn.algolia.com/?query=regex&sort=byPopularity&prefix... It sounds like you're floating a cool idea for an app ;) But market size and monetization potential seem hard to predict. Build it and they will come (maybe)