LoadTester

LoadTester is a managed HTTP and API load testing service that lets developers run distributed load tests from a browser or CI/CD without provisioning infrastructure.

What is LoadTester?

LoadTester is a cloud-based load testing platform that accepts a target URL, HTTP method, and test parameters (virtual users or requests per second) and outputs live charts, a summary report with p95/p99 latency and error rate, and exports in PDF, CSV, or JSON. Tests start in under 3 seconds and scale up to 10,000 VUs and 10,000 RPS on the Premium plan. The service is built and maintained by LoadTester (loadtester.org) and requires no worker management from the user.

Key Features

• Distributed execution — Boots workers automatically (up to 8+ in a single test), with no manual scaling or queue time; cold start under 3 seconds.
• Live analytics — Real-time charts for throughput, latency, active VUs, and errors update while the test is running.
• Smart auto-stop — Configure thresholds (e.g., p95 latency >400ms, error rate >2%) and the test stops automatically when breached.
• CI/CD and integration — API tokens, scheduled cron tests, Slack and email alerts, and webhook completion hooks (available on Premium plan).
• Export and reporting — Export results as PDF or CSV on the Free plan; add JSON on Premium. Shareable result links for team visibility.
• Threshold-based regression detection — Compare runs against a baseline and trigger notifications on latency or error rate increases of +15%.

Who is it for?

• Developers shipping releases — Run a quick performance check before deploying to catch regressions while the change is still easy to roll back.
• QA engineers validating APIs — Load test endpoints, authentication flows, and critical user journeys with a repeatable workflow (e.g., POST api.example.com/checkout at 500 RPS for 5 minutes).
• Platform teams managing CI/CD pipelines — Trigger tests from every PR or deploy automatically using API tokens, and block releases if thresholds are breached.

What can you do with LoadTester?

• Release validation: Run a 2‑minute, 500‑RPS spike test on a new checkout endpoint before merging, watch live p95 latency, and stop automatically if error rate exceeds 2%.
• API confidence: Set up a scheduled nightly test for GET /auth/me with a 400ms p95 threshold and receive a Slack alert if performance degrades.
• Team visibility: Share a completed test result link in a chat or ticket so everyone sees total requests, p95 latency, and error count without digging through logs.

How does LoadTester work?

Create a test by naming it, selecting the HTTP method and target URL, choosing VU or RPS mode, and setting rate and duration. Launch the test instantly from the dashboard—workers are dispatched in under 3 seconds. Watch real-time charts as the test runs, and optionally configure thresholds (e.g., p95 latency <400ms) that will auto-stop the test if breached. When complete, review a summary with metrics like total requests, average latency, and p95, then export or share the result.

Pricing

LoadTester operates on a freemium model. The Free plan ($0) supports 10 virtual users, 50 RPS, 1‑minute max test duration, 1 concurrent test, and community support. The Premium plan ($94.99/month) lifts limits to 10,000 VUs, 10,000 RPS, 10‑minute tests, 2 concurrent tests, and adds CI/CD integration, scheduled tests, Slack/email alerts, regression notifications, priority support, and JSON export.

FAQ

Is LoadTester free?

Yes. The Free plan lets you run lightweight API and website load tests at no cost—up to 10 VUs, 50 RPS, and 1‑minute tests. No credit card required to start.

Can I use LoadTester for API load testing?

Yes. LoadTester supports HTTP methods (GET, POST, PUT, DELETE) and any target URL. You can test endpoints, authentication flows, and critical user journeys with VU or RPS modes.