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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.

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Answer card: Claude Fable 5.1 keeps input at $10 and output at $50 per million tokens, and drops the cache read rate from $1 to $0.25, a 75% cut.

Dev ·

Claude Fable 5.1 Cuts Cache Reads by 75%

Anthropic shipped Claude Fable 5.1 on September 1 with input and output prices unchanged and cache reads cut from $1 to $0.25 per million tokens.

Flagship tools

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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

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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.