DiffMate ‑ Asset Compare Tool

Stop losing theme changes on publish by comparing first

by 84Labs · Launched: December 2023 · Free plan available.

4.2 (12) on Shopify

Manage this app

Verify your developer profile to earn a badge and build trust for your app.

Publish new theme changes with ease · Overview of changes between two versions of your theme · Copy asset changes with a single click to any theme

Get it on Shopify →

About DiffMate ‑ Asset Compare Tool

DiffMate is a convenient way to see the asset differences between different versions of your theme. Filter to see only assets that have changed, all assets, or if they exists on one but not both. Our diff-editor allows you to copy specific changes (or entire files) from one theme to another. Whenever you deploy a new version of your store DiffMate reduces the stress of losing edits or forgetting template assets not copied over and much, much more.

Last verified: August 25, 2026 · Fresh

App details

Developer: 84Labs
Category: Store design
Pricing: Free plan available
Launched: December 2023
Rating: 4.2 (12) on Shopify

Integrations with:

+ 1 more

1 plan · starts free

Free

Plans and prices as listed on the Shopify App Store.

Ratings & reviews

based on 18 Shopify App Store reviews

Use the arrows to read individual reviews

empty

— Hiplok

Excellent app that will save you loads of time, and its FREE so win win. Very easy to install and use A++++++

— Grove Sales Ltd

Eine der Apps die jeder Shopify Entwickler installiert haben sollte.

— Primedeco

Truly such a helpful and amazing tool! Makes theme updates a breeze and works perfectly. Kudos to the developers for releasing such an awesome tool for free.

— Papa & Barkley

It works as intended

— SARL Soliade

Absolutely fantastic tool. Had been fiddling with various plugins and had been fiddling around with layout and css, meaning I broke the layout when I uninstalled them. After a couple of hours looking for the changes, I downloaded this tool, and found the culprit instantly!

— My Store

Game changer! This tool saves me so much time when upgrading themes. Shopify theme upgrades are a nightmare and this tool makes it so much easier and ensures I don't miss anything. Its very basic, but hey, its free... so no complaints. I particularly like the new feature that can create any additional missing codes files not contained in the original theme by just copying left to right. Freak'in a...

— Long Reef Surf Co

Great App, easy to use and much needed!

— Senkels

It's exactly what I've been looking for to track down the changes that were made in the theme code. This should be included as a standard feature as part of Shopify, IMHO. Thank you for providing this useful tool to us!

— Revendo

This is a mind-bogglingly awesome tool for anyone who customizes their themes. The fact that Shopify codes their themes so that customizations break automatic upgrading is idiotic. They should use a parent/child system like WordPress. This app functions like any other diff tool, but it's built right into your Shopify admin like it was coded there by default (and should be). No need to downlo...

— Monsterologist

Incredibly simple and easy to use. Clearly shows all code, what's changed, how's it changed, and where it's changed at. The perfect companion for checking your theme, especially if you have custom code and are doing a theme upgrade. Huge thanks to the developers!

— ASTRA Design Werx

I am so excited to find this app, and it works well. Comparing build versions of my theme is fast and easy, it shows the results in a clear and easy-to-use way. My deployments will be easy and safe from now on. Awesome and thanks to the developers!!

— Gatherings N Stuff

It does let you get an overview of what files have changed, but the diffing algorithm is very poor. If a block of code changes from multi-line to single line, it throws off the diff for the rest of the file. See what algorithm VS Code uses, and use that; they have excellent blog posts on diffing. I ended up exporting the themes and comparing in VS Code using the "Compare Folders" extension. I al...

— Wired4Signs USA

This app is essential for teams with multiple people working on a site, making changes in the theme customizer while we have developers working on code. It should really be OOB Shopify functionality.

— DKNY

Cannot recommend this app enough - its functionality should be built into Shopify. Works flawlessly, with zero fuss or explanation needed. An absolute must have when updating themes. Thank you so much for creating this!

— Heirloom

This is a great tool for understanding which files are changing / missing between your current theme and your new theme. Easy to use and well built. Thank you!

— Logo Free Clothing