Stably vs Thunders AI: Testing Tool Comparison

Stably and Thunders AI side by side: verified capabilities, integrations, pricing, and limitations, each claim cited to an official source.

Unknown means no documentation was found; it is not the same as unsupported.

Field	Stably	Thunders AI
Identity
Category	Testing	Testing
Vendor	Stably	Thunders AI
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.	Thunders AI is a commercial testing product that sells self-healing test agents and automated review personas.
Product kind	Testing platform, AI testing agent	Testing platform, AI testing agent
AI
Uses AI	✓ Supported Test generation, Execution, Self-healing, Exploration, Failure analysis, Test data generation Verified 2026-09-26[1][2][6]	✓ Supported Verified 2026-09-26[1][2]
AI test generation	✓ Supported Supported via `stably create` CLI command and Web Editor. Verified 2026-09-26[8][9]	✓ Supported Verified 2026-09-26[2]
AI executes the app	✓ Supported Supported via AI Agent Execute. Verified 2026-09-26[11]	✓ Supported Verified 2026-09-26[2]
AI generates code only	✓ Supported Stably generates Playwright code. Verified 2026-09-26[1]	✕ Unsupported Verified 2026-09-26[2]
Autonomous exploration	✓ Supported Supported via `stably plan` and `stably create` commands. Verified 2026-09-26[12][8]	? Unknown
Vision-based interaction	✓ Supported Supported via AI Assertions. Verified 2026-09-26[7]	? Unknown
Selector-free execution	✓ Supported Supported via AI Locator. Verified 2026-09-26[13]	✓ Supported Verified 2026-09-26[2]
Adapts to UI changes	✓ Supported Supported via AI Locator (autofix). Verified 2026-09-26[13]	✓ Supported Verified 2026-09-26[2]
Self-healing	✓ Supported Supported via AI Locator and `stably fix` command. Verified 2026-09-26[13][14]	✓ Supported Verified 2026-09-26[2]
AI failure analysis	✓ Supported Supported via `stably fix` and Test Reporter. Verified 2026-09-26[14][15]	✓ Supported Verified 2026-09-26[2]
What it tests
Testing types	End-to-end, Functional, Regression, API, Visual	End-to-end, Functional, Regression, Smoke, API, Visual, Accessibility
Targets	Web app	Web app, Native mobile, API, Native desktop
Native desktop testing	✕ Unsupported Verified 2026-09-26[2]	✓ Supported Verified 2026-09-26[2]
Native mobile testing	✕ Unsupported Verified 2026-09-26[2]	✓ Supported Verified 2026-09-26[2]
Browser extension testing	? Unknown Verified 2026-09-26[2]	? Unknown
Cross-browser testing	✓ Supported Verified 2026-09-26[2]	✓ Supported Verified 2026-09-26[3]
Cross-platform testing	✓ Supported Verified 2026-09-26[2]	✓ Supported Verified 2026-09-26[2]
Real device testing	? Unknown Verified 2026-09-26[2]	✓ Supported Verified 2026-09-26[3]
Multi-tab testing	✓ Supported Verified 2026-09-26[2]	? Unknown
iframe testing	✓ Supported Verified 2026-09-26[2]	? Unknown
Canvas testing	✓ Supported Verified 2026-09-26[2]	? Unknown
PDF validation	? Unknown Verified 2026-09-26[2]	✓ Supported Verified 2026-09-26[3]
File upload testing	✓ Supported Verified 2026-09-26[2]	? Unknown
File download testing	✓ Supported Verified 2026-09-26[2]	? Unknown
OAuth testing	? Unknown Verified 2026-09-26[2]	? Unknown
Email testing	✓ Supported Verified 2026-09-26[2]	? Unknown
Notification testing	? Unknown Verified 2026-09-26[2]	? Unknown
Video content validation	? Unknown Verified 2026-09-26[2]	? Unknown
Developer integrations
MCP server	? Unknown Verified 2026-09-26[3]	✓ Supported Verified 2026-09-26[4]
VS Code extension	? Unknown Verified 2026-09-26[3]	? Unknown
SDK	✓ Supported Official · TypeScript Verified 2026-09-26[3][6]	? Unknown
PR workflow
GitHub	✓ Supported GitHub Action, Check runs, Commit statuses · Integration Verified 2026-09-26[5]	✓ Supported Integration Verified 2026-09-26[2]
CI execution	✓ Supported Verified 2026-09-26[5]	✓ Supported Integration Verified 2026-09-26[2]
GitHub PR checks	✓ Supported Integration Verified 2026-09-26[5]	? Unknown
PR-aware test selection	? Unknown Verified 2026-09-26[5]	? Unknown
Autonomous PR validation	✓ Supported Verified 2026-09-26[5]	? Unknown
PR comments	? Unknown Verified 2026-09-26[5]	? Unknown
Preview deployment testing	✓ Supported Verified 2026-09-26[5]	? Unknown
Merge gating	? Unknown Verified 2026-09-26[5]	✓ Supported Verified 2026-09-26[2]
Scheduled execution	✓ Supported Verified 2026-09-26[5]	? Unknown
Pricing
Pricing	Free official pricing	Unknown official pricing
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	SaaS, Self-hosted, Hybrid
License	Proprietary	Proprietary
License identifiers	Not researched	Not researched
Compatibility
Languages	JavaScript, TypeScript	Natural language
Runner OS	Windows, macOS, Linux	Not researched
Target OS	Windows, macOS, Linux, iOS, Android	iOS, Android
Browser engines	Chromium, Firefox, WebKit	Chromium, Firefox, WebKit
Browsers	Chrome, Edge, Firefox, Safari	Chrome, Edge, Firefox, Safari
Device modes	Responsive viewport	Real device
Creation and execution
Execution model	Browser DOM, Browser protocol, Computer vision, OS input	Real device, Browser protocol
Authoring method	Code, Recorder, Natural language, AI-generated code, AI-generated workflow, Imported tests	Natural language, Recorder
Code authoring	✓ Supported Stably is 100% Playwright-compatible, allowing engineers to edit selectors, assertions, and retries directly in Playwright code. Verified 2026-09-26[1][6]	✕ Unsupported Verified 2026-09-26[2]
Recorder	✓ Supported Verified 2026-09-26[1][9]	✓ Supported Verified 2026-09-26[3]
Natural language authoring	✓ Supported Verified 2026-09-26[1][9]	✓ Supported Verified 2026-09-26[2]
Test import	✓ Supported Existing Playwright tests can be imported. Verified 2026-09-26[9]	✕ Unsupported Verified 2026-09-26[3]
Reusable steps	✓ Supported Implied by Playwright compatibility. Verified 2026-09-26[2]	✓ Supported Verified 2026-09-26[3]
Parameterized tests	✓ Supported Implied by Playwright compatibility. Verified 2026-09-26[2]	? Unknown
Test data generation	✓ Supported Supported via AI Extraction. Verified 2026-09-26[10]	? Unknown
Fit
Audience	Developers, QA engineers, SDET	QA engineers, Developers, Product managers, Nontechnical testers
Company size	Solo, Startup, SMB, Mid-market, Enterprise	Solo, Startup, SMB, Mid-market, Enterprise
Use cases	Pull request validation, Regression testing, Release gating, Test maintenance, Test generation	Regression testing, Release gating, Cross browser testing, Cross platform testing, Test generation, Test maintenance
Validation
Visual regression	✓ Supported Verified 2026-09-26[7]	✓ Supported Verified 2026-09-26[3]
Semantic visual assertions	✓ Supported Verified 2026-09-26[7]	? Unknown
Accessibility checks	? Unknown Verified 2026-09-26[7]	✓ Supported Verified 2026-09-26[3]
API assertions	✓ Supported Verified 2026-09-26[2]	✓ Supported Verified 2026-09-26[3]
Database assertions	? Unknown Verified 2026-09-26[2]	? Unknown
Spelling and grammar checks	? Unknown Verified 2026-09-26[2]	? Unknown
Dark and light mode testing	? Unknown Verified 2026-09-26[2]	? Unknown
Performance measurement	? Unknown Verified 2026-09-26[2]	? Unknown
Running
Local execution	✓ Supported Verified 2026-09-26[16]	? Unknown
Headless execution	✓ Supported Verified 2026-09-26[16]	? Unknown
Headed execution	✓ Supported Verified 2026-09-26[16]	? Unknown
Parallel execution	✓ Supported Verified 2026-09-26[16]	✓ Supported Verified 2026-09-26[2]
Test sharding	✓ Supported Verified 2026-09-26[16]	? Unknown
Auto-waiting	✓ Supported Verified 2026-09-26[2]	? Unknown
Automatic retries	✓ Supported Verified 2026-09-26[2]	? Unknown
Network mocking	✓ Supported Verified 2026-09-26[2]	? Unknown
Secrets injection	✓ Supported Verified 2026-09-26[16]	? Unknown
Private network access	? Unknown Verified 2026-09-26[16]	? Unknown
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[3]
Execution traces	✓ Supported Verified 2026-09-26[2]	? Unknown
Console logs	✓ Supported Verified 2026-09-26[2]	✓ Supported Verified 2026-09-26[3]
Network logs	✓ Supported Verified 2026-09-26[2]	? Unknown
Replay	? Unknown Verified 2026-09-26[2]	✓ Supported Verified 2026-09-26[3]
Interactive debugging	✓ Supported Verified 2026-09-26[9]	✓ Supported Verified 2026-09-26[3]
Failure grouping	? Unknown Verified 2026-09-26[2]	? Unknown
Debug artifacts	Screenshot, Video, Trace, Console log, Network log	Not researched
Enterprise
SSO (SAML)	✓ Supported Verified 2026-09-26[4]	✓ Supported Verified 2026-09-26[3]
SSO (OIDC)	? Unknown Verified 2026-09-26[4]	? Unknown
SCIM	? Unknown Verified 2026-09-26[4]	? Unknown
RBAC	? Unknown Verified 2026-09-26[4]	✓ Supported Verified 2026-09-26[3]
Audit logs	? Unknown Verified 2026-09-26[4]	? Unknown
Secrets management	✓ Supported Verified 2026-09-26[16]	? Unknown
Configurable retention	? Unknown Verified 2026-09-26[4]	✓ Supported Verified 2026-09-26[3]
Private runners	? Unknown Verified 2026-09-26[4]	? Unknown
On-premises deployment	✓ Supported Verified 2026-09-26[16]	✓ Supported Verified 2026-09-26[3]
Data residency	? Unknown Verified 2026-09-26[4]	✓ Supported Verified 2026-09-26[3]
Training opt-out	? Unknown Verified 2026-09-26[4]	? Unknown
Operations
Setup difficulty	low	low
Maintenance approach	Reusable components, Resilient locators, Self-healing, Ai regeneration	Self-healing, Ai regeneration
Max concurrency	100	5
Reliability mechanisms	Auto wait, Retry	Self-healing
Interfaces	CLI, Web UI, API, SDK	Web UI, MCP
Security
Certifications	Not researched	Not researched
Data regions	Not researched	EU
Customer data used for training	Unknown	Not researched
Support
Support channels	Docs, Chat, Email, Dedicated engineer	Email, Chat, Dedicated engineer
Support SLA	Yes	Not researched
Integrations
Integrations	GitHub	Jira, Linear, Azure DevOps, GitHub Actions, GitLab CI, Jenkins, CircleCI, Xray