About IIX Lab

A one-person software studio. I build narrow tools for one specific problem: product data that breaks when you move it from a spreadsheet into a store.

What that actually means

Supplier tables with merged cells. SKUs that lose their leading zeros the moment Excel touches them. Product feeds rejected with "invalid value" and no row number. These are not interesting problems, which is exactly why nobody solves them properly — they are tedious, they need domain knowledge, and they never look good in a screenshot.

What is here

Twelve browser tools that run entirely on your machine. No account, no upload, no server that could leak your catalogue.
Fourteen pages on Shopify import errors, one per error message, each with the cause and the fix steps.
Notes on the same class of problem, written when I hit it.
Three small browser games, because a studio that only ships utilities is a dull place to work.

What I got wrong

I shipped a licensing bug that broke about 1.5% of paid keys. The signature was base64url, its first character could be a hyphen, and a hyphen is the separator in the key format. One in 64 buyers would have received a key that could not activate. It took a random test failure to find it.

I built a whole site on the assumption that submitting URLs to search engines means being indexed. It does not. Two months of pages, zero indexed, because the site returned HTTP 200 with the homepage for every non-existent path — a soft 404, which search engines read as duplicate content.

These are on this page because a tool that hides its failure modes is a tool you cannot trust with a catalogue.

What this site will not do

No subscription where a one-time price is honest. The Shopify tool is $9, once. The API is a subscription only because server time costs money.
No accounts for browser tools. There is nothing to sign into because nothing leaves your machine.
No fake success. If a page cannot be parsed, the tool says so instead of returning a plausible wrong number.
No dark patterns. No countdown timers, no fake scarcity, no "only 2 left".

How it is built

Static HTML, no framework, no build step for most pages. The browser tools are single files. The site is served from Cloudflare Pages. DeepSeek models write a lot of the code under review; every number on this site comes from a script that can be re-run.

Elsewhere

dev.to — longer technical write-ups
X — short notes, occasionally
Gumroad — the paid tools

This page is not a pitch. If you write about spreadsheets, e-commerce or data cleaning and want to link to a tool, link to the CSV checker — it is the one that answers a question without asking for anything.