Glossary

Continuous Revenue Protection (CRP) is the category UserApproved AI defines: software that watches your storefront for the things that quietly cost you money — broken checkout on a specific iOS Safari version, a discount code that silently fails, a theme update that shifts the Add-to-Cart button below the fold on mobile, ad creative pointing to a $0-revenue page after a SKU was renamed.

Traditional CRO is project-based: an agency runs an audit, you implement the fixes, and the work is over until the next engagement. CRP is process-based: a swarm of specialized agents continuously audits the live storefront, catches regressions the day they ship, correlates them with metric shifts, and hands you diagnosed issues with revenue impact and fix instructions.

Where CRO answers 'what could we improve?', CRP answers 'what just broke?' Both are useful; only one runs while you sleep.

Storefronts don't stay the same between Tuesday and Wednesday. Five forces are constantly mutating the shopping experience without anyone shipping a release:

1. Theme / CMS updates. Your Shopify theme, your headless CMS, your component library — they release patches that move pixels, change behavior, and occasionally break checkout on a specific viewport.

2. Campaign launches. A new ad creative starts pointing to a landing page that was renamed last quarter. A discount code is issued for an audience that the cart logic doesn't recognize. A geo-targeted promo conflicts with shipping rules.

3. Third-party script updates. Klaviyo, Meta Pixel, Google Tag Manager, and review widgets push code to your site continuously. One broken pixel can suppress conversions for a whole channel.

4. Browser / OS updates. iOS Safari point releases reliably break a percentage of CSS interactions every cycle. Chrome drops a deprecated API. A new OS release changes touch event handling.

5. Traffic-mix shifts. A campaign starts driving more mobile, more international, more first-time buyers. Funnels that worked for the old mix break for the new one.

Most monitoring tools watch your servers. The 5 Forces watch your storefront — and they never stop.

Silent Killers are the bugs that cost the most because nothing alerts you to them:

• A checkout form field that fails validation for any phone number with a country code.

• A discount code that applies the discount but doesn't deduct it from the order total on Safari.

• An "Add to Cart" button that submits successfully but the cart counter never updates on iOS.

• A free-shipping threshold display that shows the wrong currency for international visitors.

• An out-of-stock product that adds to cart and only fails at the payment step — after the customer entered card details.

These don't show up in your error logs because the underlying systems don't throw errors. They don't show up in analytics because the user just leaves. They show up only as a slowly declining conversion rate that gets explained away as "seasonal." UserApproved's site-audit agent simulates real shopping sessions across devices and catches Silent Killers the day they appear.

Every storefront starts out roughly equal across devices. Then point releases ship. Theme updates ship. Browser engines update. Six months later, mobile Safari converts 40% worse than desktop Chrome and nobody can pinpoint when that gap opened.

Device Drift is the cumulative effect of changes that touch device-specific code paths — viewport-conditional CSS, touch handlers, browser-specific JavaScript polyfills, font rendering quirks, third-party widget compatibility — without anyone ever shipping a release labeled "broke iOS conversion."

UserApproved's site-audit agent runs the same purchase journeys across iPhone, Android, and desktop on every audit cycle, surfacing the moment Device Drift starts to widen the conversion gap.