GreenLoop by Hamming
Automated testing
Test scenarios written from your prompt
Hamming generates realistic test scenarios from your prompt, so coverage does not depend on someone writing every case by hand.
- Real production calls turned into replayable test cases
“Verify date of birth before discussing any appointment.”
+183 more from the rest of the prompt
Realistic scenarios
Test callers who sound like your real customers.
- Natural conversation patterns and customer behaviors
- Personas with different needs and communication styles
- Edge cases and hard scenarios, generated automatically
Languages and accents
Test cases in the languages and accents your customers use.
- Languages, dialects, and regional variants
- Code-switching and mixed-language conversations
- Pronunciation and understanding across accents
Noise simulation
Calls from the noisy places customers actually call from.
- Background noise like traffic, crowds, or music
- Varying noise levels and types in the same suite
- Checks that noise cancellation and speech recognition hold up
Thousands of test calls, no manual dialing
Catch critical bugs before they reach users, and find where your agent breaks under load.
- Complex calls with several speakers
“You’re booked for Tuesday at 3.” → nothing was booked
Critical case testing
Check that your agent handles the calls that cannot go wrong.
- Medical information and allergies
- Safety protocols and emergency procedures
Regression testing
Catch what a prompt or model change broke before users notice.
- Response latency regressions
- Hallucinations and incorrect answers
- Behavior that changed after a prompt update
Load and stress testing
50K+ concurrent test calls across real-world usage patterns.
- Bottlenecks and response latency at each concurrency level
- Stability at the volume of your busiest hour
- The breaking point, with recovery, error handling, and resource use at the limit
IVR tests, generated and run for you
Hamming generates and runs IVR performance, reliability, and regression tests before launch.
- Misroutes, latency, and handoff errors found early in QA
- Main menu
- ├─ 1 Appointments
- ├─ 2 Billing
- └─ 3 Pharmacy → reached Billing
Transfers and context
Escalations reach the right agent or queue with the caller's context intact.
- Department, skill-based, and time-of-day routing rules
- Transfer latency and queue assignment accuracy
- Caller details and reason for call carried across transfers
- Fallback routing and callback scheduling under load
Speech recognition reliability
Your IVR understands callers on bad lines.
- Poor signal quality
- Speech recognition and error recovery on degraded audio
Compare versions before you switch
Run the same scenarios against two agent versions or providers and see which one is more consistent, accurate, and compliant.
- Latency tracked for each version over time
Switch blocked until the regression passes
Version comparison
Decide deployments on data, not on a few test calls.
- Identical scenarios across agent versions
- Accuracy and consistency, side by side
- Regressions and improvements between iterations
Provider benchmarking
Pick the voice provider and configuration that fit your needs.
- Providers compared on standardized scenarios
- Response times across providers and configurations
- Reliability, uptime, and quality differences
- Cost against performance, at each scale
Under the same load
Both versions tested at the same volume, at the same time.
- Performance at equal concurrency
- Capacity limits and success rates for each version
Hamming works with
All integrationsQuestions about
GreenLoop.
Browse every answer on the FAQ pageHamming automatically generates test cases from your agent's prompt and configuration. When you import your agent from LiveKit, Pipecat, ElevenLabs, Retell, Vapi, or any custom platform, we analyze your system prompt and create diverse test scenarios covering happy paths, edge cases, and failure modes.
You can also convert production calls into replayable test cases with one click, building a regression suite from real-world interactions.
Yes. Hamming supports multilingual testing with multiple English accents (American, British, Indian, Australian, and more) plus simulated callers in other languages. You can also simulate background noise environments to test real-world conditions.
Hamming covers 65+ languages and accents. Test how your agent handles accents, code-switching, and bad audio before they cause issues in production.
Default workspaces support 50 parallel calls, configurable up to 100+. For enterprise customers, we've run 50K+ concurrent test calls. The concurrency limit is typically determined by your voice platform's concurrency allocation.
This means you can test thousands of scenarios in minutes rather than weeks of manual testing.
Hamming provides a full REST API for programmatic access to all platform features. You can trigger test runs, retrieve results, and fail builds based on pass rates, all from your existing CI/CD workflow.
Teams typically run Hamming tests on every PR that touches agent prompts or tool configurations, catching regressions before they reach production.
It depends on your constraints and timeline. Building can make sense if you have unique requirements, strict data residency needs, or testing is core to your product. For most teams, buying accelerates time-to-coverage without tying up engineering bandwidth.
We break down the decision framework, tradeoffs, and hybrid paths in our Build vs Buy guide.
Hamming reaches 95%+ agreement with human evaluators by using higher-quality models and audio-based evaluation.
Our two-step evaluation pipeline first determines relevancy (should this guardrail apply?), then evaluates, which eliminates false failures from irrelevant checks.
Yes. Hamming's test plans feature supports sequences where the same persona calls multiple times: book an appointment, then reschedule, then cancel. The system maintains memory across calls.
This is essential for testing appointment workflows where you need existing data (you can't cancel an appointment that doesn't exist).
Related
reading.
- Testing Multi-Step Voice AgentsStrategies for testing complex multi-turn conversations and appointment workflows.
- AI Voice Agent Regression TestingHow to build regression test suites that catch breaking changes before production.
- Multi-Language Support for Voice AI TestingTest voice agents in 65+ languages with accent coverage and language-switching scenarios.
- Hamming vs. Retell & Vapi QA TestingWhy platform QA isn't enough: compare stress-testing and live observability.
- Why State Transitions Matter in Multi-Agent Voice SystemsDesigning reliable handoffs between agents in multi-agent systems.
- Pipecat Bot Testing: Automated QA & Regression TestsAutomated testing and regression suites for Pipecat voice agents with CI/CD integration and component-level validation.
