Sematext Synthetics
Sematext Synthetics is a paid monitoring service for APIs, web URLs, websites and user journeys from locations around the globe.
What Sematext Synthetics is
Sematext Synthetics is a paid monitoring service for APIs, web URLs, websites and user journeys from locations around the globe. HTTP monitors record response data and timings while checking response codes, headers, content and timing conditions. Browser monitors run Playwright scripts in headless Google Chrome to simulate website actions. The service checks SSL validity and expiry, and HTTP monitors detect certificate changes. Alerts can connect to Slack, OpsGenie, Zapier and VictorOps. A Vercel integration can create Browser monitors for selected projects. Credentials may be stored in AWS Secrets Manager and inserted during execution. Private-location agents run as Docker containers on Linux or Windows machines. One HTTP run has 128 MB of memory and trims response bodies to 2 MB. Pay-As-You-Go costs $2 a month per HTTP monitor, $7 per Browser monitor, with a $5 monthly minimum and 30 days retention. A 14-day trial is available.
Good
- HTTP and browser monitoring options
- Response, content, timing and SSL checks
- Alert integrations including Slack and OpsGenie
- Private agents run in Docker on Linux or Windows
- 14-day trial available
Watch out
- No static IP list for firewall allowlisting
- HTTP responses are trimmed to 2 MB
- HTTP runs have 128 MB memory
- $5 monthly minimum applies
Who it suits
Sematext Synthetics suits teams monitoring APIs, websites and user journeys with regional checks, alerts and optional private locations. It fits environments that can run Docker for private agents.
Verdict
Sematext Synthetics covers API, browser and certificate monitoring with integrations and private agents. Its memory, response-size and firewall constraints should be checked alongside usage-based pricing before deployment.
Plans and prices
From Sematext Synthetics's own pricing page, checked 2 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Pay-As-You-Go | $2 a month | Minimum $5 per month · 30 days retention · monitor count and retention affect price · per HTTP monitor; $7 per Browser monitor |
The facts
Each one read from Sematext Synthetics's own pages, with the date it was checked.
What it does
- Alerts and integrations
- The product page lists Slack, OpsGenie, Zapier, and VictorOps as alert integration examples.checked 2 Oct 2026
- API checks
- HTTP monitors can validate response codes, headers, content, and timing conditions for monitored endpoints.checked 2 Oct 2026
- Firewall limitation
- Sematext says it does not provide a list of static IP addresses for firewall allowlisting.checked 2 Oct 2026
- HTTP monitor limit
- An HTTP monitor run has 128 MB of memory, and its response body is trimmed to 2 MB.checked 2 Oct 2026
- Monitor types
- HTTP monitors record response data and timings, while Browser monitors run scripts that simulate user actions on websites.checked 2 Oct 2026
- Private locations
- Private location agents run as Docker containers and can be deployed on machines where Docker runs, including Linux and Windows.checked 2 Oct 2026
- Sensitive data
- Browser monitor credentials can be stored in AWS Secrets Manager and substituted into scripts only during execution.checked 2 Oct 2026
- SSL monitoring
- Synthetics checks certificate validity and expiry, and HTTP monitors also detect certificate changes.checked 2 Oct 2026
- Support
- The product page says support is available through email, live chat, and phone calls.checked 2 Oct 2026
- Vercel
- The Vercel integration can create a Browser monitor for each selected Vercel project.checked 2 Oct 2026
- What it does
- Sematext Synthetics actively monitors APIs, web URLs, websites, and user journeys from locations around the globe.checked 2 Oct 2026
Where it runs
- Browser monitoring
- Browser monitors use Playwright with a headless Google Chrome browser in an isolated Node.js environment.checked 2 Oct 2026
The company
- Company history
- Sematext's history page says the company launched as Sematext International in Spring 2010.checked 2 Oct 2026
- Founded
- 2010checked 28 Sep 2026
- Headquarters
- Brooklyn, New York, USAchecked 28 Sep 2026
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