This is a Linux-only CLI benchmarking tool written in Zig that uses the `perf_event_open` syscall to measure hardware performance counters (CPU cycles, instructions, cache references/misses, branch misses) alongside wall time and peak RSS. It repeatedly executes user-specified commands, collects samples, and computes statistical summaries (mean, standard deviation, quartiles, outlier counts) with a colorful terminal UI. The tool compares multiple commands, treating the first as a reference, and displays deltas with statistical significance testing using Student's t-distribution. The codebase is small but well-crafted, demonstrating advanced use of Linux perf events, statistical analysis, and terminal rendering. It is actively maintained by Andrew Kelley (author of Zig) and serves as a practical alternative to Hyperfine for hardware-aware benchmarking.