Small tools.
Each one solves a single specific problem an engineer might land on at 2am. Open source, free, no signup, runs in your browser. Hosted here as a place to put the small things that didn't deserve their own repo, but were useful enough to ship.
showing 10 of 11
AI
4Streaming race (replay)
Watch three LLMs race the same prompt. Tokens per second, time-to-first-token, total time.
Multi-provider tokenizer + cost estimator
Paste a prompt. See token counts and per-call cost across Anthropic, OpenAI, and Google.
Cassette explorer
Drop a cuesheet YAML file. Browse interactions in the same UI that ships with the package.
Streaming SSE viewer
Paste an SSE response. See each frame decoded, with event names and JSON-pretty payloads.
Networking
5CIDR calculator (IPv4 + IPv6)
Type a CIDR. Get the network, broadcast, range, host count, and neighbour subnets.
DNS race around the world
Type a domain. Watch four global DoH resolvers race to answer, plotted on a live 3D globe.
TLS cert inspector
Look up a domain's TLS chain. Issuer, expiry countdown, SANs, signature algorithm, validity.
DNS-over-HTTPS visualizer
Look up A, AAAA, MX, TXT, CNAME, NS, CAA records side-by-side via Cloudflare and Google DoH.
Public-web latency race
Race the same HEAD request against major edge networks. Live bars, browser-side timing.
