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
All articles →
Dev
Anthropic Suspends Claude Fable 5 and Mythos 5
Anthropic disabled Claude Fable 5 and Mythos 5 worldwide after a US government order. The timeline, the trigger, and how to fall back to Opus 4.8 fast.
Security
AI in Cybersecurity 2026: Real vs Hype, Both Sides
AI in cybersecurity in 2026: what it really does for defenders (triage, summarization, code review), what attackers do with it, and the dual-use problem.
Security
Bug Bounty Starter Guide for Sysadmins
A bug bounty starter guide for sysadmins: how your DNS, HTTP and Linux skills transfer, the five free tools I open, and the report shape that gets paid.