Side by side
Speedscale vs Tsung
Both stand on performance testing software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APILinuxMac+3
Choose Speedscale if your team wants to test APIs and load using captured production traffic, or run the full stack in a customer’s AWS, GCP, or Azure account. The free proxymock plan is suited to local mocking and basic traffic recording. Look elsewhere if browser-based testing is required.
Visit Speedscale Free plan LinuxMacSelf-hosted+1
Tsung offers broad protocol coverage, distributed load generation, and detailed benchmark reporting at no listed cost. Check the experimental plugin status and setup requirements against your intended workload.
Visit TsungThe facts
| Speedscale | Tsung | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Linux, Mac, Self-hosted, Web, Windows | Linux, Mac, Self-hosted, Windows |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 3 | 1 |
| Maker | Not published | Not published |
| Website | speedscale.com | tsung.readthedocs.io |
| On performance testing software | #14 of 38 | #18 of 38 |
Speedscale: what it does well
- Replays captured Kubernetes traffic to validate changes.
- Creates load tests from production traffic and tracks latency and throughput budgets.
- Mocks flaky or third-party dependencies with production-realistic responses.
- Full stack can run in AWS, GCP, or Azure customer accounts.
- Free proxymock plan includes unlimited local mocking.
What to know first
- Browser-based testing is not supported.
- Free proxymock is limited to local mocking and basic traffic recording.
- IMAP support is capture-only, and mTLS support is partial.
Tsung: what it does well
- Simulates thousands of users on one CPU.
- Distributes load across a client cluster.
- Supports HTTP, PostgreSQL, LDAP, and other protocols.
- Reports response times, errors, and server metrics.
- Free under GNU General Public License version 2.
What to know first
- MySQL, WebSocket, AMQP, and MQTT plugins are experimental.
- Distributed runs require passwordless SSH or rsh.
- Requires Erlang/OTP R16B03 or later.
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