Synthetic monitoring alternative
Synthetic monitoring tools like Checkly and Datadog Synthetic require you to write and maintain test scripts for every scenario you want to monitor. Sitewatch takes a different approach: it automatically discovers and validates every asset on every page — JS bundles, stylesheets, third-party scripts, redirect chains — with zero scripting. Add a URL, get monitoring in 60 seconds.
The tests passed. The page is still broken.
Plain-English summary
A script added to the page months ago has no test covering it. It is now missing, and every scripted journey still passes.
Scripted synthetics
All checks passing
Sitewatch
Critical incident
Free scan
See what Sitewatch catches that test scripts miss.
02Side by side
| Scenario | Synthetic monitoring (Checkly / Playwright) | Sitewatch asset monitoring |
|---|---|---|
| Requires writing test scripts | Yes — written in JavaScript or TypeScript | No — zero scripts, zero config |
| Automatic asset discovery | No — only checks what you script | Yes — every JS, CSS, image, font, third-party script |
| Catches files served as the wrong kind of file | Only if explicitly asserted in scripts | Automatic on every check |
| Setup time | 60 minutes (write, test, deploy scripts) | 60 seconds (paste URL, done) |
| Maintenance burden | Scripts rot as UI changes — constant upkeep | Zero maintenance — adapts automatically |
| Catches third-party script outages | Only if you script the check | Every third-party asset checked automatically |
| Deploy hook integration | Yes (CLI + CI) | Yes (Vercel, Netlify, GitHub Actions) |
| Plain-English diagnosis | Raw assertion failure output | What broke, which asset, why it matters |
Requires writing test scripts
Automatic asset discovery
Catches files served as the wrong kind of file
Setup time
Maintenance burden
Catches third-party script outages
Deploy hook integration
Plain-English diagnosis
03No scripts required
Sitewatch fetches your pages, parses the HTML, and validates every linked asset automatically. No Playwright scripts, no test maintenance — just paste your URL and monitoring starts.
Catches JS served as HTML, CSS served as plain text, and any asset delivered with the wrong content type. The server answers normally throughout, so a scripted check misses all of it unless someone wrote an assertion for that exact file.
Every file is fingerprinted. When one changes between deploys — intentionally or not — Sitewatch detects it immediately without any scripted assertions.
Stripe, Intercom, analytics, chat widgets — every third-party dependency on your page is checked on every monitoring interval. If Stripe.js 404s, you know before your users do.
Trigger verification automatically the moment your deploy completes via Vercel, Netlify, or GitHub Actions webhooks. No test script needed — Sitewatch re-validates every asset on the deployed page.
When something breaks, you get the exact asset, the failure type, and what it means — not raw script output or assertion failures to decode. What broke, which asset, why it matters.
04The cost of the gap
Friday, 4:47pm
The deploy succeeds.
Every scripted journey passes.
The team logs off for the weekend.
Synthetic tests: 12/12 green
Monday, 9:12am
A client calls.
Nobody has been able to check out.
All weekend.
Two days of lost sales
The broken file was added to the page after the tests were written, so nothing looked at it. A check that reads the page instead of following a script would have caught it on the deploy.
05Simple by design
Paste the URL you want to monitor. No test scripts to write, no browser automation to configure, no CI pipeline to wire up. One URL is all Sitewatch needs.
Sitewatch fetches your page, parses the HTML, and builds a complete inventory of every linked script, stylesheet, image, font, and third-party dependency.
Is it there, is it the kind of file it claims to be, and has it changed — all checked on every run. New assets added to the page are discovered and checked automatically.
When an asset fails, you get an alert with the exact file path, failure type, and a plain-English explanation of what it means — no script output to parse.
06An honest answer
Scripted synthetic monitoring reaches places we deliberately do not. This is a genuine trade, not a straight upgrade.
If you need…
Recommendation
zero
test scripts required
60 sec
setup time
20
detection rules
Sitewatch monitors your production site automatically — from $0.
No test scripts. No configuration. Free plan available.
07Common misconceptions
Reality — It means differently shaped. A script checks what you told it to; reading the page checks everything the page actually asks for, including what was added last week.
Reality — They cover the assets involved in the steps you wrote. The classic failure is a resource added after the test — it breaks and the test still passes.
Reality — The strongest setup is often both: scripts prove the journey completes, page checks catch the missing file that empties the page.
Reality — Yes. If a multi-step journey is what you need verified, buy that and skip us.
08FAQ
Checkly and Playwright require you to write test scripts that simulate specific user interactions. If you want to check that a button exists, you write a script to find it. If you want to check that an asset loads, you write an assertion for it. Sitewatch requires no scripts — it automatically discovers every asset on your pages and validates them all. You get coverage across your entire page without writing a single line of code.
Yes, for complex multi-step interactions like login, checkout, or form submissions, synthetic tools like Checkly remain the right choice. Sitewatch handles the asset layer — the JS bundles, stylesheets, and third-party scripts that power those flows. Many teams run both: synthetic tests for user journeys, Sitewatch for resource-level validation. The two approaches are complementary, not mutually exclusive.
Checkly only catches what you explicitly script. If a new JS dependency gets added to your page and nobody updates the Playwright tests, it won't be caught. Sitewatch catches it automatically — any new asset on the page is discovered and validated without configuration. It also catches files served as the wrong kind of file, silent content changes between deploys, and third-party script outages — all without any test scripts.
About 60 seconds. Paste your URL, Sitewatch runs its first check immediately. Connect alert channels (Slack, email, PagerDuty) and you're fully set up. Compare that to a Checkly setup: writing Playwright scripts, testing them locally, deploying them to Checkly, and wiring up CI hooks — easily 60 minutes for a single page.
Yes. Sitewatch fetches your page over HTTP and parses the HTML, which includes all statically referenced assets in script and link tags. For SPAs that inject assets dynamically at runtime, Sitewatch validates the initially referenced bundles — the entry points your app loads. If you have dynamically loaded chunks that aren't linked in the HTML, those won't be discovered automatically, but the core bundle and stylesheet validation still applies.
09Explore more
Live monitoring
Sitewatch is watching these sites right now
Real sites we check every few minutes for the failures uptime tools miss — the pages that stay “up” while something quietly breaks.