The toolbox for ai users
toolbox.
Estimate tokens, repair a model’s JSON, clean up Markdown and hidden characters, read chat exports and compare prompt versions, all on your device.
Keep this toolbox for offline use
16 useful places to start.
Token counts are estimates with a stated range, not exact counts. None of these tools can tell whether text was written by an AI.
Token and context-budget estimator
Estimate how many tokens a text uses and how much of a model’s context window it takes, with a stated margin of error.
LLM API cost calculator
Work out what a prompt and answer cost per request, per month and per year from the prices you enter.
JSON repair and validator for AI output
Fix the JSON a language model gives you: trailing commas, single quotes, comments, code fences, cut-off text and more.
Markdown to plain text converter
Strip Markdown formatting from an AI answer or a README and keep the words.
Markdown table to CSV converter
Turn a Markdown (GitHub style) table, such as one an AI assistant wrote, into CSV for a spreadsheet.
Markdown table generator
Turn CSV into a Markdown, HTML, LaTeX or plain-text table, with alignment.
Hidden character finder
Find zero-width, bidirectional, tag and other invisible or look-alike characters in text, and clean them out.
Prompt version comparer
Compare two versions of a prompt word by word and see exactly what was added or removed.
Unified diff generator
Compare two texts line by line and produce a diff in the format of diff -u and git diff.
Regex tester
Test a JavaScript regular expression on your text: every match, its position and capture groups, or a replacement preview.
Chat export viewer
Read a conversation export from ChatGPT, Claude or a list of messages: turns, roles, sizes and a plain transcript.
Text pattern extractor
Pull email addresses, URLs, numbers, hashtags, IP addresses, dates or colours out of pasted text.
YAML and JSON converter
Convert YAML to JSON or JSON to YAML, with clear errors and safe handling of anchors.
JSON viewer
Explore a collapsible JSON tree, search values, format and minify.
JSON formatter
Format or minify JSON and catch syntax errors.
Unicode character inspector
Inspect code points, names for common controls and UTF-8 bytes.
A few things you
can tick off.
- Check whether a prompt fits a context window
- Fix the JSON a model returned
- Find hidden characters in pasted text