Only the current version so far — new entries appear as the app ships updates.
Useful Knots Pro is a books & reference app by Neptuns Apps with 10,000+ downloads (about 13K estimated). +10 installs in the last 7 days. Rated 4.6 from 154 ratings. Released Feb 21, 2015. Install growth, rank history, SDKs and ad networks.
From the store listing: “Some of the best knots you can tie!”