Gatling vs Vegeta

Gatling is a load-testing and performance engineering platform for simulating traffic and finding performance bottlenecks. Tests can be written in code, generated with a no-code tool or imported from Postman. Scenarios support Java, JavaScript, TypeScript, Scala and Kotlin. The load engine supports HTTP out of the box and JMS, and can be extended for other protocols. The listing includes API and stress testing, distributed load and hybrid deployment; browser-based testing is marked unsupported. Gatling Studio is a native application that runs locally on macOS, Windows and Linux. Enterprise Edition adds a web interface for managing and monitoring tests, live dashboards, CI/CD integration, advanced permissions and hybrid or cloud deployment. Listed integrations include GitHub Actions, Jenkins, GitLab CI, Azure DevOps, Datadog, Dynatrace, New Relic, Slack and Microsoft Teams. Gatling says it is SOC 2 Type II certified and encrypts traffic in transit and stored data at rest. A free plan is available. Basic (annual) is €89 a year, billed annually; Enterprise has a free 14-day trial without a credit card.

Vegeta is a free, open-source HTTP load-testing tool and Go library that sends requests at a constant rate. Its command-line interface is built for UNIX-style composition, while the library offers use from Go programs. The project states that its load measurements avoid coordinated omission and that distributed testing is supported. Reports can be written as text, JSON, histograms, or HDR plots, and results can also be encoded as CSV, Gob, or JSON. The attack command can expose an optional Prometheus exporter. HTTP/2 works when supported by the server, including HTTP/2 over TCP without TLS. TLS options include client certificates and keys, custom root certificates, and ignoring invalid server certificates. The documented request timeout defaults to 30 seconds, with zero disabling timeouts. Prebuilt binaries, package-manager installs, distribution packages, and source builds are documented for Linux, macOS, Windows, API use, and self-hosting. The repository uses the MIT license.