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About Loader.io
Loader.io is a hosted load testing service from SendGrid. You register a target host, run a test that simulates connections to your application for a set duration, and watch the results in real time before sharing graphs and statistics with your team.
Tests can be run from the web interface for quick checks or started through an API so load testing becomes part of a deployment routine. A free plan exists alongside paid plans.
Strengths
- No load generation infrastructure to run yourself
- Real-time monitoring of each test
- API for running tests from deployment scripts
- Shareable graphs and statistics
Limitations
- Requires an account and registering your target host
- Closed source hosted service
Details
- Pricing
- FreemiumFree load testing service with paid plans listed on its pricing page.
- License
- Proprietary
- Developer
- SendGrid, Inc.
- Platforms
- Web
- How it runs
- Hosted service
- Account
- Required
- Works offline
- No
- Best suited for
- Developers stress testing a web app or API without running their own load generators
- Categories
- API clients, Website testing
- Last verified
- Added
- Provenance
- Facts checked against the developer's own pages and store listings, 1 sources on file.
Alternatives to Loader.io
Compare allSoftware that can replace Loader.io for an important use case, and what changes if you switch.
Grafana k6
An open-source command-line load testing tool that runs test scripts written in JavaScript.
Grafana k6 is a free open-source CLI with JavaScript test scripts, so load is generated from your own machines rather than a hosted service.
Artillery
Load testing and Playwright end-to-end testing toolkit with an open-source CLI and an optional cloud dashboard.
Artillery is an MPL-2.0 CLI that can run on your own AWS or Azure infrastructure, with an optional cloud dashboard and Playwright testing.
Apache JMeter
An open-source Java application for load testing and measuring the performance of web applications and servers.
Apache JMeter is a free Apache-2.0 Java application you run yourself, covering many protocols with distributed testing across machines.
Gatling
A load testing tool for web applications and APIs, with an open-source edition and hosted enterprise platform.
Gatling has an open-source Community Edition with tests written as code, and a paid Enterprise Edition with CI automation.
Locust
An open-source load testing tool where user behaviour is defined in plain Python code.
Locust is open source and scripts user behaviour in Python, running on your own machines with distributed support.
Vegeta
Command-line HTTP load testing tool that sends requests at a constant rate.
Vegeta is an MIT-licensed CLI that sends HTTP requests at a constant rate from your own machine, without complex flow scripting.
Siege
Command-line HTTP load tester that stress-tests web servers with simulated concurrent users.
Siege is a GPL-3.0 command-line HTTP stress tester for macOS and Linux, simulating concurrent users from a terminal.
Similar software
Related functionality, not necessarily a direct replacement.
Checkly
A code-first monitoring platform that runs Playwright browser checks and API tests from global locations.
KeyCDN Performance Test
A free web tool that measures DNS, connection, TLS and TTFB times for one URL from 10 locations.
ByteCheck
A free online checker that measures a website's Time To First Byte.
