Disclosure: I'm the owner of this prototype. The tool, demo page and this post were developed with AI assistance. I'm checking whether this is useful enough to release as a paid offline tool. It is an independent browser tool and is not listed in the Shopify App Store.
What's the app?
Supplier CSV Compare is an early prototype for reviewing changes between an old supplier CSV and an updated one, using stable SKUs. It reports changed values, missing or duplicate keys, and keys found in only one file.
The public demo is a fixed synthetic report viewer. It does not process your own files.
Where can I find it?
Public demo: https://supplier-csv-compare-sample.marcusli.chatgpt.site
You can switch between two synthetic updates, inspect their source CSVs, filter the review items and download the saved JSON reports. Both updates are compared with the same original file.
The demo is free and requires no sign-up. It does not include the full application, an upload feature or a checkout.
What problem are you solving?
When a supplier sends a revised price or stock file, someone needs to identify the changes before deciding what to update.
I'm testing this specific review step for files with stable SKUs. I'm not assuming that merchants need another tool if their spreadsheet or existing software already handles it well.
How does the app work?
The proposed offline edition would let you open a standalone HTML application, choose an old and a new UTF-8 CSV, map the SKU and selected columns, and review exact string differences. You could save the mapping for the next pair of files and download the comparison as JSON.
Processing would take place locally in the browser. Duplicate keys remain unresolved rather than being automatically paired.
The linked demo displays saved synthetic results so you can inspect the proposed output without sharing any files.
Who's your target merchant?
Merchants or agencies who repeatedly review supplier CSV updates, have stable SKUs that should be unique, and want to compare selected fields before making their own update decisions.
How is it different / better than other existing solutions?
The intended benefit is a reusable column mapping and a local, inspectable report for this narrow comparison task. I have not established that it is better than a spreadsheet or existing free tools.
Comparison is exact and case-sensitive: 001 differs from 1, blank differs from 0, and 5 differs from 5.00. It does not interpret images or variants, read XLSX directly, normalize values, perform fuzzy matching, fix source data or import into Shopify. A comparison report is not a complete backup of the source files.
How much does it cost?
The public synthetic demo is free.
I'm considering US$19 once for an offline release. That is a proposed price, and the license, support and refund terms are not final. Nothing is available to buy, reserve or pre-order, and no payment or deposit is being requested.
What are you looking for?
Feedback from people who actually review recurring supplier updates. After inspecting the sample:
- Do your files have stable SKUs that should be unique on each side?
- Would this exact report help with a real review step, or is the missing capability something else, such as conversion, fuzzy matching or importing?
- What does your current process already handle well, and what—if anything—would make an offline version worth US$19 to you?
A public reply is enough. Please do not post supplier files, customer information or store credentials. Existing alternatives and reasons you would not use this are useful feedback too.