Fortio
Fortio: A focused, free tool for programmable HTTP and gRPC load generation. Ranked #24 of 37 in Performance Testing Software by our editors (7.0/10); pricing: Open source; best for focused HTTP and gRPC load generation.
At a glance
- Editor score7.0 / 10
- PricingOpen source
- Best forFocused HTTP and gRPC load generation
- Paid fromFree
- Load testingYes
- Facts checked21 Sep 2026
Where it wins
- Free and open source with CLI, web UI, REST API, and Docker images
- Generates configurable HTTP, gRPC, TCP, and UDP workloads
- Reports latency histograms, percentiles, throughput, and status results
Where it doesn't
- No browser testing capabilities
- No supplied integrations for broader testing ecosystems
- No documented multi-region distributed-load service
Our verdict on Fortio
Fortio is an open-source performance testing tool for microservices and networked services. It is designed for teams that need focused HTTP and gRPC load generation, with additional TCP and UDP utilities. Workloads can be shaped by query rate, duration, call count, connections, payloads, and related request settings. Fortio supports web, Windows, macOS, Linux, and API access, and it can run on-premise through downloadable binaries, source, or Docker images.
Its strongest area is controlled service-level testing. HTTP support includes HTTP/2, TLS, headers, methods, compression, and redirects, while gRPC covers load testing and ping workloads. The tool records latency histograms, percentile results, throughput, response sizes, and status results. A command-line interface supports direct operation, while the optional server adds a web UI for triggering runs and viewing graphs. The REST API can remotely trigger, monitor, and stop runs, and JSON result saving enables comparative reporting.
Fortio suits engineers who value a free, open-source utility with scripting, automation, and flexible deployment options. Its echo services, proxy features, HTTP fan-out, and configurable connections and threads broaden its usefulness for service and network diagnostics. The trade-off is a narrow testing focus: browser testing is not part of the product, and the offering does not provide supplied integrations or a documented multi-region distributed-load service. Choose Fortio for programmable HTTP and gRPC workloads, percentile analysis, and on-premise control; choose another product when browser journeys, broader ecosystem connections, or distributed global load generation are central requirements.
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Fortio pricing
Fortio fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Free |
| Load testing | Yes |
| Stress testing | Not verified |
| Browser-based testing | Not verified |
| Distributed load | Not verified |
| API testing | Yes |
| Deployment model | On-premise |
| Max virtual users | Not verified |
| Deployment | Self-hosted |
| Platforms | Web, Windows, macOS, Linux |
| Support | Community, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Open source |
| Website | fortio.org |
| Facts checked | 21 Sep 2026 |
Alternatives to Fortio
- Grafana k6A scriptable performance testing tool with local, distributed, browser, and hosted execution.9.3
- OpenText Core Performance EngineeringA broad hybrid performance-testing suite for enterprise web, API, and mobile workloads.9.2
- Apache JMeterA free, established choice for protocol-level load, stress, API, and distributed testing.9.1
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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