OpenClaw vs ZeroClaw vs NullClaw vs PicoClaw: Full Comparison 2026

The OpenClaw ecosystem has fractured into four major camps. You have the original OpenClaw β€” full-featured, widely supported, but heavy. You have ZeroClaw, the Rust rewrite chasing raw performance. You have NullClaw, the Zig implementation pushing to the absolute minimum. And you have PicoClaw, the Go port built for $10 embedded hardware. Each makes a…