RubricHQ vs Hamming
RubricHQ and Hamming both generate simulated callers, score on goal completion and audio, and replay golden sets in production. Hamming goes deeper on adversarial red-teaming, 50k+ concurrent load testing, and EU/UK data residency. RubricHQ adds a prompt-rewrite loop, Co-Pilot querying, and published pricing.
- Both do
- Simulated callers, goal-based and audio scoring, golden-set monitoring
- RubricHQ adds
- Prompt-rewrite loop, Co-Pilot querying, and published pricing
- Hamming is known for
- Dedicated red-teaming, 50k+ concurrent load testing, EU/UK data residency
By Noor, Co-founder, RubricHQ
What Hamming is — Hamming AI (YC S24, founded by ex-Tesla engineers) is a testing and production-monitoring platform for voice and chat agents, with heavy emphasis on red-teaming and large-scale load testing.
The scorecard
● has it ● limited ● no| Capability | RubricHQ | Hamming |
|---|---|---|
| Simulation channels | Phone, web, and text simulations | AI voice callers with accents, background noise, interruptions, DTMF/IVR |
| Languages | Multilingual persona library | 65+ languages and regional accents |
| Evaluation methods | Code-as-judge, LLM-as-judge, and audio metrics | Goal-based scoring, 50+ built-in metrics, audio-native emotion/tone, custom evaluators |
| Red-teaming | Adversarial personas in the scenario library | Dedicated red-teaming for risky behaviour before launch |
| Load testing | Concurrent simulation batches | Up to 50,000+ concurrent calls |
| Production monitoring | Yes — live production call observability with drift alerts | Golden-set replay every few minutes with Slack/email alerts |
| Prompt optimization | Yes — diagnoses failures, generates prompt rewrites, pushes to Vapi/Retell | Not a documented feature |
| Ask-your-calls Q&A | Yes — natural-language Q&A across every call, metric, and tag | Not a documented feature |
| Supported providers | Vapi, Retell, LiveKit, Pipecat | LiveKit, Pipecat, ElevenLabs, Retell, Vapi, Hopper, SIP, API |
| Data residency | Self-hosting on Enterprise | US / EU / UK residency; single-tenant enterprise deployments |
| Pricing transparency | Public — Pay as you go ($0, 200 free credits) or Growth $399/mo, Enterprise custom | Not published — contact sales |
How they differ
Red-teaming and load testing
Hamming's strongest differentiators are dedicated red-teaming — probing for jailbreaks, unsafe outputs, and policy violations — and load testing up to 50,000+ concurrent calls. RubricHQ includes adversarial personas and runs concurrent batches, but does not market a separate red-team product or advertise five-figure concurrency.
Prompt optimization
RubricHQ turns a failing batch into a concrete prompt rewrite, proves it against the same suite, and pushes it to Vapi or Retell. Hamming reports what broke and how often; deciding and applying the fix is your team's job.
Data residency
Hamming offers US, EU, and UK data residency and single-tenant enterprise deployments. RubricHQ offers self-hosting on its Enterprise plan, which covers strict data-control requirements, but multi-region managed residency is not a listed option.
Querying and optimization workflow
RubricHQ's Co-Pilot lets you ask questions across all calls in plain language, and Discovery adds semantic search over transcripts. Hamming's analysis is dashboard- and metric-driven. If exploratory investigation of call history matters to you, that favours RubricHQ.
Frequently asked questions
Is RubricHQ a good Hamming AI alternative?+
Yes, for teams that want simulation, evaluation, and monitoring plus a prompt-optimization loop and published pricing. Hamming is the stronger choice if dedicated red-teaming, very large-scale load testing, or EU/UK data residency are hard requirements.
How much does Hamming AI cost?+
Hamming does not publish pricing; it has startup and SMB options but requires a sales conversation. RubricHQ starts at $0 (pay-as-you-go, 200 free credits, no card), with Growth at $399/mo and custom Enterprise.
Do both support Vapi and Retell?+
Yes. Both integrate with Vapi and Retell, as well as LiveKit and Pipecat. Hamming also lists ElevenLabs, Hopper, generic SIP, and API connections.
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Sources · reviewed September 11, 2026
Hamming details are drawn from public sources and change over time. Spot something out of date? Tell us.
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