Which AWS region is actually closest to you? pong pings all 33 of them at once and shows a live, self-sorting latency table right in your terminal.

• Concurrent HTTP HEAD probes across 33 AWS regions — one worker thread per region
• Live TUI table, always sorted by lowest average latency
• Rolling min / avg / max / stddev / p95 / p99 via fixed-capacity ring-buffer percentiles
• Optional warmup so the numbers settle before you read them

cargo run                 # start pinging
cargo run -- --warmup 5   # let pings settle for 5s first
cargo run -- --help

Quit with q or Ctrl-C. Prebuilt binaries (Linux x86_64 / aarch64, macOS aarch64) ship on each release.

Each region gets a thread that fires a HEAD at https://dynamodb.<region>.amazonaws.com/ping every second — DynamoDB's health endpoint makes a conveniently ubiquitous latency target. Results flow back over an mpsc channel into the ring buffers behind the table. Pure std threads, no async runtime. Written in Rust with ratatui + crossterm.