Test Every Flow.
Break Nothing.
End-to-end functional testing for web applications. AI-powered and human-verified, with results in your pull requests and Slack.
Sign up and schedule a call with our founders to get access.
From $2,500/month80% less than building in-house
What are functional testing services?
Feature validation
Functional testing services verify that each feature and user flow behaves as intended across your web app, sign in, checkout, permissions, forms, and more. A provider builds, runs, and maintains a reliable suite that covers real user journeys.
Why Bug0?
Bug0 acts like your AI QA Engineer. We deliver AI-powered functional testing services for web apps, set up end-to-end browser tests in days, keep them stable release after release, and surface verified results in pull requests and Slack.
100% of critical flows in 7 days
80% total coverage in 4 weeks
PR and commit checks in GitHub and Slack
Self healing tests that adapt automatically
Hundreds of parallel tests in under 5 minutes
Zero scripts to write, CI and CD ready
Early stage teams that want coverage without hiring
Product teams that ship daily and want stable tests
Enterprises needing functional testing with clear SLAs
How Bug0 functional testing works
AI maps your app
Agents explore flows, discover states, and capture elements that matter.
Tests are generated
We produce readable Playwright based tests that mirror real user behavior.
Self healing
Tests adapt when UI changes, so brittle locators do not block releases.
Massively parallel runs
Hundreds of browser tests finish in less than five minutes.
Human verification
QA experts review edge cases and validate results for accuracy.
CI and CD native
Results arrive as GitHub checks, pull request comments, and Slack reports.
What you get
100% of critical flows covered
One hundred percent of critical flows covered in seven days
80% total coverage
About eighty percent total coverage in four weeks
Zero maintenance time
Zero time spent on test maintenance by your engineers
Real time reporting
Real time reporting in GitHub and Slack
Keep all tests
Keep all tests even if you leave
Types of functional testing we cover
Smoke testing and happy paths
Quick validation of core functionality.
Verify your app's essential features are working correctly. We test the happy paths users take most often to ensure your core functionality never breaks.
Bug0 vs other functional testing services
See how Bug0's AI-powered approach compares to traditional functional testing providers.
| Feature / Vendor | Rainforest QA | Testlio | Applause | Global App Testing | |
|---|---|---|---|---|---|
Test creation | AI auto generates tests, human verified | No code with AI assist, service team builds suites | Human testers with some automation | Manual testers with limited automation options | Crowd testers, exploratory focus |
Maintenance | Self healing, zero upkeep for your team | Service team updates tests | Manual updates by test managers and freelancers | Manual updates within programs | Manual updates tied to tester cycles |
Speed to coverage | Critical flows in seven days | Weeks to months | Weeks, tied to scheduling | Weeks, depends on program cadence | Fast exploratory passes, limited for daily pull requests |
Execution | Hundreds of parallel browser tests in less than five minutes | Platform runs with service oversight | Cases executed by a tester network | Large global crowd executes cases | Global tester pool runs checks |
Verification | AI plus human QA experts | Human testers | Human testers | Human testers | Human testers |
Setup | Zero setup, CI and CD ready | Requires onboarding | Requires onboarding | Requires onboarding | Requires onboarding |
Scalability | Unlimited parallel runs, AI driven | Limited by service capacity | Limited by freelancer availability | Large tester pool, program managed | Large tester pool |
Best fit | Teams that want continuous QA on every pull request | Teams that want one vendor for platform and services | Apps that need many real devices and payment paths | Consumer apps, localization, and UX studies | Quick global checks across markets |
Swipe horizontally to see all comparisons
Who uses functional testing services
Product led SaaS teams that ship weekly
Ecommerce teams that manage checkout, subscriptions, and refunds
Fintech and banking products with KYC, transfers, and role based access
Healthcare portals and patient apps that require compliance and reliability
Marketplaces with buyer and seller flows and complex permissions
Internal tools and admin dashboards that need safe regression coverage
B2B platforms that integrate third party providers and webhooks
Pricing
Start self-serve or go fully managed. Switch anytime.
Studio
Generate tests yourself with AI
Describe flows in plain English or upload screen recordings. Bug0 generates Playwright tests, auto-heals on UI changes, and integrates with your CI.
Managed
Your dedicated AI QA pod
Forward-deployed engineers plus agentic AI handle test planning, generation, verification, and release gating. Zero setup, zero hiring.
Loved by fast-moving teams who scale QA with agentic AI.
Legal AI Tech Company
Bug0 gives us the speed of AI-native automation with the accuracy and self-healing of human QA. Their hybrid approach is a game changer.
Loves Agentic AI
SaaS Link Management
Bug0 is the closest thing to plug-and-play QA testing at scale. Since using it at Dub, it’s helped us catch multiple bugs before they made it to prod.
Loves Hands-Off QA
Commerce Infrastructure Platform
We plugged Bug0 into our CI and had our critical flows covered within a week. It’s like having a proactive QA engineer reviewing every deploy—without slowing us down.
Loves Forward-Deployed QA
DevTools Platform
Bug0 integrates seamlessly into our workflow and delivers instant value. The automated test coverage gave us confidence to ship faster while maintaining quality standards.
Loves Human-Verified Coverage
AI Research Lab
With Bug0, regression testing became effortless. They update tests as fast as we ship, so we can release with confidence every time.
Loves Effortless Regression QA
Outcomes, not overhead.
Bug0 is more than a tool. It's your AI QA Engineer.
AI writes and maintains your tests. Humans verify results. You ship faster without hiring.