Two of my apps are breaking each other on my Shopify theme, but I'm terrified to touch the theme code
You don't need to know Liquid or JavaScript to fix an app collision safely. Shopify gives you a fully reversible way to test changes before anything goes live.
What's going on
Something like this happens more often than merchants expect: you install a second app, say a new upsell popup or a reviews widget, and suddenly your sticky add-to-cart bar disappears, a countdown timer double-renders, or the page starts jumping as it loads. Two apps are stepping on each other's JavaScript, CSS, or placement on the page, and the obvious fix, opening the theme code and removing or reordering something, feels terrifying if you've never edited a theme file before. A wrong edit to a core template can take down your whole storefront, and that fear is exactly why so many merchants leave a broken page live rather than risk making it worse.
The good news is that Shopify's tooling is built around exactly this fear. Almost nothing in the admin requires you to edit your live, published theme directly, and most app-related conflicts can be diagnosed and fixed on a separate, invisible-to-customers copy of your theme, with a straightforward way back to where you started if anything goes wrong.
Why it happens
Most app conflicts happen because two apps are both trying to modify the same part of the page independently: both injecting a floating button in the same corner, both loading a slider library with different versions, or both writing into the same section of a core template. Shopify themes don't sandbox apps from each other, so when two scripts each assume they're the only one modifying the page, whichever loads or runs second can visually clobber the first.
Newer apps mostly avoid this by using app embeds and app blocks, which merchants can add and remove entirely inside the theme Customizer without any code being written into theme files at all. Older apps, or apps installed before that system matured, sometimes still ask you to paste a script snippet directly into a theme file, which is exactly the kind of hand-edit that creates fear of breaking things and is harder to cleanly undo.
5 ways to fix it
Turn off the conflicting app first, without touching any code
Before opening any code editor, go to Online Store > Themes > Customize and check the App embeds panel in the left sidebar. Any app that adds itself there can be switched off instantly and reversibly, with no file touched. If the feature was added as an app block inside a section instead, remove that block the same way from within Customize. A large share of two-apps-colliding problems are solved by this alone, since nothing was permanently changed and there's nothing to roll back afterward.
Duplicate the live theme and make the fix on the copy
From Online Store > Themes, duplicate your live theme. The duplicate is created unpublished, so customers keep seeing the original while you work. Open the duplicate, disable or adjust the conflicting app there, and check the result using the theme's preview link. Only publish the duplicate over your live theme once you're satisfied it's fixed. Your original theme is never edited directly, and if you change your mind, the old live theme is still sitting in your theme library, one click from being republished.
Isolate the actual culprit by disabling apps one at a time on the duplicate
When it isn't obvious which two apps are actually fighting, work through them one at a time on the duplicate theme: disable a suspected app, reload the preview, and note whether the problem is gone. This turns a stressful guessing game into a controlled process, and since it's all happening on a duplicate, a wrong guess never touches the live store.
If a real code edit is unavoidable, use the code editor's version history
Sometimes the fix genuinely requires editing a Liquid, CSS, or JavaScript file directly, for example removing a script an app hard-coded into a theme file instead of using an app embed. Do this inside the theme's code editor, ideally on the duplicate. The editor keeps a version history for each file, so you can compare against or restore an earlier saved version in a couple of clicks if the edit goes wrong. That gives you a safety net even for manual code changes, on top of the duplicate theme itself acting as your rollback.
For recurring or fragile conflicts, get a developer to check it once
If the same two apps keep colliding after every update, or the fix requires untangling minified third-party JavaScript, it's reasonable to have a Shopify developer look at it once rather than repeatedly patching around it yourself. A short, one-time diagnostic pass, rather than an ongoing subscription, is often all a genuine script-collision case needs.
Bottom line
You never have to edit your live storefront to fix an app conflict. Duplicating the theme, using the code editor's version history, and toggling app embeds and blocks off in the Customizer together give you a fully reversible way to diagnose and fix the problem. This is a workflow and caution issue rather than something an app can solve for you, so there's no app angle here. If the conflict turns out to need real code surgery, a one-off developer consult is a more proportionate ask than installing another app.
Browse the rest of the problem library, run a free storefront scan to catch issues like this automatically, or email us and we'll work out a custom solution for it.