Supermaven vs Codeium: Free AI Autocomplete Compared in 2026

I've spent the better part of two weeks switching back and forth between Supermaven and Codeium as my daily inline completion engine, on an M2 MacBook Air running VS Code for TypeScript and a fair amount of Go. Both are in the small club of AI autocomplete tools that still offer a free tier worth actually using rather than a three-day trial dressed up as one. And both approach the same problem - ghost-text suggestions as you type - from noticeably different angles. This isn't a copilot-vs-the-world piece.