Tools + answers for the people who keep things running
Your tech questions, answered in seconds.
Free, fast, browser-based tools for sysadmins, developers and security folks. No accounts, no uploads, no tracking your inputs. Plus field guides that give you the answer first and the theory after.
Flagship tools
All tools →Dev
AI Token Counter
Count tokens and estimate cost for GPT-5, Claude 4 and Gemini 3 before you call the API.
Runs in your browser
Dev
JSON to TypeScript
Turn any JSON payload into clean, typed TypeScript interfaces in one paste.
Runs in your browser
Sysadmin
tar Command Generator
Build, extract or list any tar archive by clicking, with every flag explained.
Runs in your browser
SEO
AI Crawler Blocker
Generate a robots.txt that blocks GPTBot, ClaudeBot and 20 other AI bots, plus Nginx and Apache rules.
Runs in your browser
By category
Developer tools
Decode, build and debug faster: JWT, cron, encodings and more.
Network tools
Subnets, DNS, IPs: the daily bread of network admins, done right.
Security tools
Passwords, TLS certificates and the things that keep you off incident calls.
Email & DNS tools
SPF, DKIM, MX and the plumbing behind deliverability.
SEO tools
Technical SEO checks that actually move rankings.
Sysadmin tools
Converters, calculators and cheats for people who run servers.
Latest articles
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Dev
The awk Cheatsheet: Process Text in Columns
A practical awk cheatsheet: print columns with $1 and $NF, set field separators with -F, filter rows by pattern, sum a column, and use BEGIN and END blocks.
Network
dig and nslookup Cheatsheet: Query DNS Fast
A practical dig and nslookup cheatsheet: look up A, AAAA, MX, TXT, NS and CNAME records, trim noise with +short, trace from the root with +trace, and query @8.8.8.8.
Sysadmin
Docker Commands Cheatsheet: The Everyday Ones
A practical Docker cheatsheet: run a container with docker run, list with ps, follow logs, exec into a shell, bring a stack up with compose, and prune disk.