Sematext Synthetics
Deliver better, more reliable, websites & APIs.
Sematext Synthetics launched on June 10, 2020 with 62 votes, #810 of 4,317 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 6 years on.
What it does
Sematext Synthetics allows you to collect information on the performance of critical business transactions, resources, load test information, and much more. Improve digital experiences & detect bugs before they impact your users.
Monitor uptime, simulate user journeys, and test APIs with Sematext Synthetic Monitoring. Detect downtime, latency, and errors before they impact users.
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Context.devJul 2026 · context.dev · ▲814Hello, My name is Yahia, I've been working on scraping products for a long time and maintain a couple of free sites in my spare time (E.g. knifegeek.io) What prompted this is i've rebuilt scraping infra at every company I've started and finally just made it a product. Pass a URL, get clean markdown, html, images, sitemap or pass a domain, get logos, colors, socials, industry data. Goal is to offer a better service than VC funded competitors at a fraction of the cost. Stealth is included and automatic at no additional cost (normally an upcharge by alternatives). Would love your honest thoughts.
ReplicasJun 2026 · replicas.dev · ▲239Hey HN! I'm Connor, creator of Replicas. I'm a heavy Codex/Claude Code user, and I wanted to hand off tasks to agents like I would to an engineer - kick something off before work, let it scaffold while I'm at lunch, even come back to a ready PR. The problem: existing alternatives use workspace VMs that are black boxes. I have no access to any of them - they can't run tests, read logs, or use tools like the Playwright MCP (which I use to verify agents actually fixed what they claim to fix). Replicas gives agents real cloud workspaces where they can: - Run your test suite and read the…


PerfAgents Uncloud2024 · perfagents.com · ▲33Hello HN! We’re excited to share PerfAgents, a synthetic monitoring tool built for startups and enterprises seeking robust and proactive monitoring across global regions. TL;DR: PerfAgents is a synthetic monitoring platform that uses your existing E2E automation scripts (Playwright, Puppeteer, Cypress, and Selenium) for web app monitoring, reducing setup time by 80%. No complex integrations, no vendor lock-in, and proactive alerts that let you catch bugs before users do. Problem We’re Solving: Ensuring application reliability across all regions is tough, especially when existing monitoring…
Datadog Synthetics2020 · datadoghq.com · ▲63Monitor user experience with self-maintaining browser tests
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