Best typing tutor for indie hackers

There are roughly 30-50 active typing tutors in the consumer space (TypingMaster, Keybr, Monkeytype, TypeRacer, etc.), but nearly all target either casual gamers or corporate training departments. The common failure pattern is that they ignore context: indie hackers don't care about words-per-minute vanity metrics—they care about reducing syntax errors, improving muscle memory for IDE shortcuts, and building speed without sacrificing accuracy on code-heavy input. The gap is massive here. Most tutors use generic English or arbitrary word lists; none are optimized for the actual keystrokes a coder makes (brackets, semicolons, camelCase patterns, vim/emacs keybindings). A new entrant should build a tutor that lets you upload your own codebase or GitHub repo and learns your actual typing patterns and problem areas in real code context. Gamification should be minimal—focus instead on measurable output (lines of code typed accurately per hour, reduction in typos in actual pull requests over time). The monetization angle is strong because indie hackers will pay $5-15/month for something that measurably speeds up their shipping velocity.