Stably vs TestZeus Hercules: Testing Tool Comparison
Stably and TestZeus Hercules side by side: verified capabilities, integrations, pricing, and limitations, each claim cited to an official source.
SDK examples
One documented example per tool where available.
- Python
Stably: no approved SDK sample.
- Package:
- testzeus-hercules (version not recorded)
- Install:
- pip install testzeus-hercules
pip install testzeus-herculesRun: testzeus-hercules
Official docs
Unknown means no documentation was found; it is not the same as unsupported.
| Field |  Stably |  TestZeus Hercules |
|---|---|---|
| Identity | ||
| Category | Testing | Testing |
| Vendor | Stably | TestZeus |
| Product status | active | active |
| Summary | Stably is an AI-native testing platform that provides an agentic IDE for parallel coding agents to get test coverage quickly. | Hercules is TestZeus's open-source testing agent that executes test cases written in natural language. |
| Product kind | Testing platform, AI testing agent | AI testing agent |
| AI | ||
| Uses AI | Supported Verified 2026-09-26[2] | |
| AI test generation | Supported Verified 2026-09-26[2] | |
| AI executes the app | Supported Verified 2026-09-26[2] | |
| AI generates code only | Unsupported Verified 2026-09-26[2] | |
| Autonomous exploration | Unknown Verified 2026-09-26[2] | |
| Vision-based interaction | Supported Verified 2026-09-26[2] | |
| Selector-free execution | Supported Verified 2026-09-26[2] | |
| Adapts to UI changes | Supported Verified 2026-09-26[1] | |
| Self-healing | Supported Verified 2026-09-26[1] | |
| AI failure analysis | Unknown Verified 2026-09-26[2] | |
| What it tests | ||
| Testing types | End-to-end, Functional, Regression, API, Visual | End-to-end, Functional, Regression, API, Visual, Accessibility |
| Targets | Web app | Web app, API |
| Native desktop testing | Unsupported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Native mobile testing | Unsupported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Browser extension testing | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Cross-browser testing | Supported Verified 2026-09-26[2] | Supported Verified 2026-09-26[2] |
| Cross-platform testing | Supported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Real device testing | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Multi-tab testing | Supported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| iframe testing | Supported Verified 2026-09-26[2] | Supported Verified 2026-09-26[2] |
| Canvas testing | Supported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| PDF validation | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| File upload testing | Supported Verified 2026-09-26[2] | Supported Verified 2026-09-26[2] |
| File download testing | Supported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| OAuth testing | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Email testing | Supported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Notification testing | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Video content validation | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Developer integrations | ||
| MCP server | Unknown Verified 2026-09-26[3] | Supported Verified 2026-09-26[2] |
| VS Code extension | Unknown Verified 2026-09-26[3] | Unknown Verified 2026-09-26[2] |
| SDK | Supported Verified 2026-09-26[2] | |
| PR workflow | ||
| GitHub | Unknown Verified 2026-09-26[2] | |
| CI execution | Supported Verified 2026-09-26[5] | Supported Verified 2026-09-26[2] |
| GitHub PR checks | Unknown Verified 2026-09-26[2] | |
| PR-aware test selection | Unknown Verified 2026-09-26[5] | Unknown Verified 2026-09-26[2] |
| Autonomous PR validation | Supported Verified 2026-09-26[5] | Unknown Verified 2026-09-26[2] |
| PR comments | Unknown Verified 2026-09-26[5] | Unknown Verified 2026-09-26[2] |
| Preview deployment testing | Supported Verified 2026-09-26[5] | Unknown Verified 2026-09-26[2] |
| Merge gating | Unknown Verified 2026-09-26[5] | Unknown Verified 2026-09-26[2] |
| Scheduled execution | Supported Verified 2026-09-26[5] | Supported Verified 2026-09-26[3] |
| Pricing | ||
| Pricing | Free | Unknown |
| Pricing models | Free, Subscription, Usage-based, Per parallel session, Custom, Mixed | Subscription, Usage-based |
| Free tier | Available | Unavailable |
| Trial | Unknown | Available |
| Deployment | ||
| Deployment | SaaS, Self-hosted | Local, SaaS, Self-hosted |
| License | Proprietary | Open source, Proprietary |
| License identifiers | Not researched | Not researched |
| Compatibility | ||
| Languages | JavaScript, TypeScript | Natural language, Python |
| Runner OS | Windows, macOS, Linux | Windows, Linux, macOS |
| Target OS | Windows, macOS, Linux, iOS, Android | Windows, macOS, Linux |
| Browser engines | Chromium, Firefox, WebKit | Chromium, Firefox, WebKit |
| Browsers | Chrome, Edge, Firefox, Safari | Chrome, Edge, Firefox, Safari |
| Device modes | Responsive viewport | Emulator, Responsive viewport |
| Creation and execution | ||
| Execution model | Browser DOM, Browser protocol, Computer vision, OS input | Browser protocol |
| Authoring method | Code, Recorder, Natural language, AI-generated code, AI-generated workflow, Imported tests | Natural language, AI-generated workflow |
| Code authoring | ||
| Recorder | Unknown Verified 2026-09-26[2] | |
| Natural language authoring | Supported Verified 2026-09-26[2] | |
| Test import | Unknown Verified 2026-09-26[2] | |
| Reusable steps | Supported Verified 2026-09-26[2] | |
| Parameterized tests | Unknown Verified 2026-09-26[2] | |
| Test data generation | Unknown Verified 2026-09-26[2] | |
| Fit | ||
| Audience | Developers, QA engineers, SDET | QA engineers, Developers, Product managers, Nontechnical testers |
| Company size | Solo, Startup, SMB, Mid-market, Enterprise | SMB, Mid-market, Enterprise |
| Use cases | Pull request validation, Regression testing, Release gating, Test maintenance, Test generation | Regression testing, Release gating, Test generation |
| Validation | ||
| Visual regression | Supported Verified 2026-09-26[7] | Supported Verified 2026-09-26[2] |
| Semantic visual assertions | Supported Verified 2026-09-26[7] | Supported Verified 2026-09-26[2] |
| Accessibility checks | Unknown Verified 2026-09-26[7] | Supported Verified 2026-09-26[2] |
| API assertions | Supported Verified 2026-09-26[2] | Supported Verified 2026-09-26[2] |
| Database assertions | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Spelling and grammar checks | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Dark and light mode testing | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Performance measurement | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Running | ||
| Local execution | Supported Verified 2026-09-26[16] | Supported Verified 2026-09-26[2] |
| Headless execution | Supported Verified 2026-09-26[16] | Supported Verified 2026-09-26[2] |
| Headed execution | Supported Verified 2026-09-26[16] | Supported Verified 2026-09-26[2] |
| Parallel execution | Supported Verified 2026-09-26[16] | Supported Verified 2026-09-26[3] |
| Test sharding | Supported Verified 2026-09-26[16] | Unknown Verified 2026-09-26[2] |
| Auto-waiting | Supported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Automatic retries | Supported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Network mocking | Supported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Secrets injection | Supported Verified 2026-09-26[16] | Unknown Verified 2026-09-26[2] |
| Private network access | Unknown Verified 2026-09-26[16] | Unknown Verified 2026-09-26[2] |
| Diagnosis | ||
| Screenshots | Supported Verified 2026-09-26[2] | Supported Verified 2026-09-26[2] |
| Video recording | Supported Verified 2026-09-26[2] | Supported Verified 2026-09-26[2] |
| Execution traces | Supported Verified 2026-09-26[2] | Supported Verified 2026-09-26[2] |
| Console logs | Supported Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Network logs | Supported Verified 2026-09-26[2] | Supported Verified 2026-09-26[2] |
| Replay | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Interactive debugging | Supported Verified 2026-09-26[9] | Unknown Verified 2026-09-26[2] |
| Failure grouping | Unknown Verified 2026-09-26[2] | Unknown Verified 2026-09-26[2] |
| Debug artifacts | Screenshot, Video, Trace, Console log, Network log | Screenshot, Video, Network log, Html report, Junit |
| Enterprise | ||
| SSO (SAML) | Supported Verified 2026-09-26[4] | Supported Verified 2026-09-26[3] |
| SSO (OIDC) | Unknown Verified 2026-09-26[4] | Unknown Verified 2026-09-26[3] |
| SCIM | Unknown Verified 2026-09-26[4] | Supported Verified 2026-09-26[3] |
| RBAC | Unknown Verified 2026-09-26[4] | Unknown Verified 2026-09-26[3] |
| Audit logs | Unknown Verified 2026-09-26[4] | Unknown Verified 2026-09-26[3] |
| Secrets management | Supported Verified 2026-09-26[16] | Unknown Verified 2026-09-26[3] |
| Configurable retention | Unknown Verified 2026-09-26[4] | Supported Verified 2026-09-26[3] |
| Private runners | Unknown Verified 2026-09-26[4] | Supported Verified 2026-09-26[3] |
| On-premises deployment | Supported Verified 2026-09-26[16] | Unknown Verified 2026-09-26[3] |
| Data residency | Unknown Verified 2026-09-26[4] | Unknown Verified 2026-09-26[3] |
| Training opt-out | Unknown Verified 2026-09-26[4] | Unknown Verified 2026-09-26[3] |
| Operations | ||
| Setup difficulty | low | low |
| Maintenance approach | Reusable components, Resilient locators, Self-healing, Ai regeneration | Self-healing, Ai regeneration |
| Max concurrency | 100 | 15 |
| Reliability mechanisms | Auto wait, Retry | Self-healing |
| Interfaces | CLI, Web UI, API, SDK | CLI, SDK, MCP |
| Security | ||
| Certifications | Not researched | Not researched |
| Data regions | Not researched | Not researched |
| Customer data used for training | Unknown | Not researched |
| Support | ||
| Support channels | Docs, Chat, Email, Dedicated engineer | Slack, Docs, Dedicated engineer |
| Support SLA | Yes | Not researched |
| Integrations | ||
| Integrations | GitHub | Not researched |