TestZeus (Hercules)
Open-source agentic end-to-end testing framework covering web, API and voice agent testing.
| Category | Evals & Testing |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | freemium |
| Pricing notes | Open-source core; commercial platform on top |
| Framework integrations | — |
| Funding / ownership | — |
| GitHub stars | 1,042 |
| Maintenance | active (commit 2026-06-10) |
| License (GitHub) | AGPL-3.0 |
| Open issues | 31 |
| Maturity signal | 86/100 (Mature) — computed from public GitHub signals, see methodology |
Pricing/feature source: https://www.speechmatics.com/company/articles-and-news/de-risk-your-voice-agent-11-best-voice-agent-testing-platforms
Maturity signal is computed from public GitHub data only. How it is calculated.
Frequently asked questions
Is TestZeus (Hercules) open source?
Yes. Licensed under AGPL-3.0.
Can I self-host TestZeus (Hercules)?
Yes — TestZeus (Hercules) can run in your own infrastructure.
How much does TestZeus (Hercules) cost?
Freemium. Open-source core; commercial platform on top