How to tell if a Shopify app will overwrite your meta tags before you install it

Step by step

1. Read the access request screen before you approve it. When you click Add app, Shopify shows exactly what the app can touch. Read-only access ("View products", "View your store's content") means it physically cannot change your meta tags. The flags to watch for are the edit permissions: "Edit products", "Edit collections", "Edit your Online Store pages and blog posts", and "Edit code / themes". Your SEO meta title and description live on each resource — Shopify stores them as the metafields global.title_tag and global.description_tag — so any app with edit access to products, collections, or pages can technically overwrite them. If an SEO-unrelated app is asking to edit your products or theme, that's your cue to dig deeper.
2. Read how the app actually works, not just what it promises. On the listing and in the app's docs, look for the mechanism. Apps that "auto-optimize", "bulk edit", "AI-generate", or "auto-apply" meta tags are built to write directly into your fields — that's the whole point, and yes, they will replace what's there. Apps that "inject" or "render" tags through your theme or a script tag usually leave your stored metafields alone and just add their own output at the page level. Both are fine if you know which one you're getting; the trap is installing a writer when you assumed it was a reader.
3. Ask support one direct question and skim the bad reviews. Message the developer before installing: "Does your app overwrite the existing SEO title and description (global.title_tag / global.description_tag), or only add its own tags — and can I preview changes before they go live?" A solid app answers plainly and offers a preview or dry run; a vague answer is a red flag. Then sort the reviews by lowest rating and search for words like "overwrote", "changed my titles", or "lost my meta" — recurring complaints tell you far more than the marketing copy.
4. Snapshot your SEO fields before you install, then test on a small batch. Record the current meta titles, descriptions, alt text, and tags for at least a sample of products, collections, and pages, and keep that record outside the store. Install the new app on a few low-traffic items or a test collection first, wait, then re-check those exact fields against your record — that's how you catch a silent rewrite while it's still small and reversible. Doing this by hand for a whole catalog is the painful part, which is exactly the gap SEO Vault fills: it snapshots every SEO field across your products, collections, and pages once a day, alerts you when a batch of them changes (and flags the app most likely behind it), and lets you roll any field back to its previous value in one click — so trying a new app stops being a gamble.

Source: Shopify Help Center (help.shopify.com) — see its guides on editing SEO meta fields for products and on the data access and permissions an app requests at install.

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