See how your site stacks up vs Sentry
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Quick Verdict
Sentry is the gold standard for in-app error and exception tracking — install the SDK and you'll see every JavaScript crash, backend exception, and release regression. Lemwatch is the external counterpart: it watches your live site for downtime, slow Core Web Vitals, SEO regressions, broken links, security drift, and visual changes. They're complementary, not competitive — but if you only need one and you're not shipping a complex app, Lemwatch covers the website-health side at a fraction of Sentry's growth-cost.
Choose Lemwatch if you need:
- Agentless monitoring — no SDK install required
- SEO, security headers, SSL, DNS, and visual checks Sentry doesn't do
- Flat per-site pricing — no event-volume surprises
- Built for agencies and site owners, not just dev teams
Choose Sentry if you need:
- JavaScript and backend exception tracking with stack traces
- Release health and regression detection
- Session replay and performance tracing (APM)
- Source-map-aware error grouping
Compare the workflow, not a stale checklist
Product availability, feature names and plan limits change. Use the current documentation for Lemwatch and Sentry to validate the capabilities that matter to your team.
What must the check represent: a public page, an API, or a complete authenticated journey?
Who will configure and own it: a non-technical team, developers, or both?
Which evidence do you need after an alert: request context, a script result, logs, or a customer-facing status?
This page does not treat a feature label as a permanent product fact. Confirm current coverage, implementation requirements and commercial terms with each provider before purchase.
Honest Comparison
Every tool has strengths and weaknesses. Here's an honest look at both.
Pros
- Zero-code setup — paste a URL and you're monitoring
- All-in-one: uptime, performance, SEO, security, visual
- Flat $19/mo Pro — no per-event pricing
- Public status pages and white-label client reports
- GA4 + Search Console integration with session-weighted accuracy
Cons
- No JavaScript error capture or stack traces
- No backend exception tracking
- No session replay or APM tracing
Sentry
Pros
- Industry-standard error and exception tracking
- Source-map-aware stack traces and release health
- Session replay shows exactly what users did before a crash
- Performance tracing across frontend and backend
Cons
- Requires SDK install and configuration
- Pricing scales with event volume — costs spiral on busy sites
- No SEO, security, SSL, DNS, or visual change monitoring
- No public status pages or white-label client reports
How to Switch from Sentry
Use this checklist to validate a migration in your own environment.
Export your sites from Sentry
Export or copy the monitored URLs from Sentry using the options available in your account.
Create your free Lemwatch account
Start with the free plan for 10 sites and confirm the checks, limits, and integrations you need.
Import and map your monitors
Add the relevant URLs and configure the checks you want to run for each site.
Rebuild your Sentry alert routing
Configure the notification channels and thresholds available to your plan, then test them against your existing workflow.
Run both workflows in parallel
Compare coverage, alert behaviour, and retained history before deciding whether to change your existing service.
Need help migrating? Email us at support@lemwatch.com
Lemwatch vs Sentry FAQ
When to use Lemwatch, when to use Sentry, and when to use both
More Comparisons
Monitor Your Live Site — No SDK Required
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