Summary

This free AI code checker scores any pasted code, a VBA macro, a Google Apps Script snippet, or a general script, from 0 to 100. It runs five client-side checks: line length, nesting depth, comment ratio, naming, and magic numbers or TODO markers, then shows a full breakdown. Nothing is uploaded: the score updates live, right in your browser, with no signup and no daily limit.

Score Your Code's Quality with a Free AI Code Checker

Paste a VBA macro, Google Apps Script snippet, or any block of code below. Biscuit's AI code checker scores it from 0 to 100 on formatting, nesting depth, comments, naming, and magic numbers, right there in your browser. No signup, nothing leaves your machine.

Try it now

AI code checker

Paste your code below. The score updates as you type, so you can see exactly which change moves the needle.

Paste at least 3 lines of code above to get a score.

How it works

What the AI code checker actually checks

Line length and nesting depth

Lines over 100 characters and brackets nested more than three or four levels deep both cost points. Long, deeply nested code is the kind that's hard to review and easy to break.

Comments and naming

The checker reads your comment-to-code ratio and flags single-letter variable names outside obvious loop counters like i or j. A function called f(a, b, c) is a function nobody wants to touch in six months.

Magic numbers and TODOs

Unexplained numbers buried mid-formula, plus any leftover TODO or FIXME marker, count against the maintainability score. They're usually the first thing a teammate asks about.

Privacy first

Nothing you paste ever leaves your browser

The AI code checker runs every check locally, in JavaScript, on your machine. There's no server call, no AI model reading your macro, no copy stored anywhere. Close the tab and it's gone, the way a tool that touches your work code should behave.

  • Zero network requests when you paste or edit code
  • No account, no API key, no rate limit
  • Works the same for a 5-line snippet or a 200-line module
A dogs paw next to a magnifying glass resting on a printed page of code, symbolizing the AI code checker reviewing code line by line

Common questions

Is this AI code checker actually free?
Yes, no signup, no credit card, no daily limit. It runs entirely in your browser, so there's no server cost on our side either.
What languages does it check?
Any of them, really. The five checks (line length, nesting depth, comments, naming, magic numbers) look at structure, not language-specific syntax, so VBA macros, Google Apps Script, Python, and JavaScript all score the same way.
Does my code get sent anywhere?
No. Everything runs client-side in your browser tab. Nothing is uploaded, logged, or stored, beyond a single anonymous ping that just counts a tool run.
How is the 0 to 100 score calculated?
Five checks worth 20 points each: line length, nesting depth, comment ratio, naming, and magic numbers or TODO markers. Add them up and that's your score. No black box, no invented AI verdict.
Why did my score drop when I added a TODO comment?
TODO and FIXME markers count as maintainability debt. They're useful reminders, but each one is unfinished work sitting in shipped code, so the checker treats it as a small ding, not a crime.
Can this replace a real linter like ESLint?
No. Think of it as a 10-second gut check before you paste a macro into production, not a replacement for a language-specific linter or a code review.
My code is deeply nested on purpose, is that a problem?
Sometimes nesting is unavoidable. The checker just flags it so you can decide, it doesn't rewrite your code or judge your architecture choices.

Want Biscuit to fetch your next formula too?

The AI code checker is free forever. When you're back in a spreadsheet fighting a VLOOKUP or an ARRAYFORMULA, Formula.dog does the same instant, no-signup trick for formulas.

Explore Formula.dog