OpenDota is described as 'Volunteer-developed, open source platform providing Dota 2 data. It provides a web interface for casual users to browse through the collected data, as well as an API to allow developers to build their own applications with it' and is a game development tool in the development category. There are three alternatives to OpenDota for Web-based, iPhone, Android Tablet and iPad. The best OpenDota alternative is Dotabuff, which is free. Other great apps like OpenDota are Plink.gg and Tracker.GG.
Dotabuff is the place where millions of Dota 2 players get in depth statistics, share games, their profiles, and better understand the game we all love.
The cross-platform application for full immersion in the game world. Call up, prepare to play, find worthy opponents and track the game progress of your friends.
Tracker.GG tracks over 100 million players across popular games like Fortnite, Apex Legends, Destiny, Rocket League and more. Find detailed stats on players, check out the leaderboards and more.
Doesn't have an API, you'd have to do webscraping instead.