Best Alternatives to CheckOO – Checkout Monitor & Uptime Tracker for WooCommerce

Why Look Beyond CheckOO

CheckOO fills a specific niche: it runs synthetic $0.00 test transactions through your actual WooCommerce checkout pipeline on a schedule, catching failures that a normal uptime monitor would miss entirely — a broken gateway, a JS error blocking form submission, a plugin conflict that throws a fatal error mid-checkout. It's deliberately narrow, testing entirely within your WordPress install with no external API calls, and purging its test data after each cycle.

But that narrow scope is exactly why some store owners look for something different. CheckOO tests checkout proactively, on a timer, before a customer ever hits the broken flow — it doesn't look backward at orders that already went wrong, and it doesn't watch for general PHP errors outside the checkout pipeline. If what you actually need is a way to find orders that already got stuck, or a broader error-catching net for your whole site, the two plugins below approach the problem from different angles.

OrderUnstick

OrderUnstick takes a completely different, after-the-fact approach to WooCommerce reliability. Rather than simulating checkout transactions the way CheckOO does, it scans existing orders — specifically ones sitting in Pending payment or On-hold status that carry gateway metadata like a Stripe payment intent ID or charge reference — and flags them as candidates for manual review. It's read-only: it doesn't call the Stripe API to verify whether a charge actually succeeded, doesn't change order status, and doesn't issue refunds or auto-complete anything. Think of it as a smoke detector rather than a fire extinguisher. This makes it a good fit for store owners fielding "I paid but my order still shows pending" tickets, or agencies auditing a client site after a migration or gateway plugin switch, where stuck orders tend to pile up quietly. Currently at version 0.1, it's free on WordPress.org with no premium tier or license key.

Erriscope

Erriscope widens the lens considerably. Instead of focusing only on checkout transactions or stuck orders, it watches your site broadly for PHP errors, fatal crashes, and WooCommerce-specific failures, then groups repeated occurrences into a single "incident" with a count and severity label instead of flooding you with duplicate log entries — so 40 identical fatal errors in an hour show up as one incident, not 40 log lines. Like CheckOO, it runs entirely locally with no external account, no API key, and no data leaving your server, and when WooCommerce is active it automatically layers in read-only monitoring for cart, checkout, and payment failure points (declined payments, checkout exceptions, cart calculation errors) without touching the live transaction flow. It suits solo store owners who want an early warning after a plugin update, agencies wanting a lightweight no-signup option across multiple client sites, and developers trying to gauge how often a specific error recurs rather than scrolling raw debug logs. The core plugin is free and listed on WordPress.org.

Which One Fits

All three tools are free right now and none require an external account or third-party data pipeline, but they solve different slices of the same underlying anxiety — that checkout can silently break without anyone noticing. CheckOO is the one to run if you want proactive, scheduled testing of the actual checkout steps. OrderUnstick is the one to run if you're already dealing with customer complaints about stuck orders and need a fast way to triage which ones deserve a look in your gateway dashboard. Erriscope is the one to run if you want a general safety net for fatal errors and WooCommerce failures across the site, not just the checkout flow itself. Depending on how cautious you want to be, running more than one of these together — proactive testing, error monitoring, and stuck-order detection — covers more ground than any single plugin does alone.