RubricHQ vs Roark
The core difference is where the test cases come from. RubricHQ generates synthetic scenarios and personas from your prompt, so you can test before you have any traffic. Roark replays your actual production calls against new agent versions, which is powerful once you have call volume. RubricHQ also adds a prompt-rewrite loop and Co-Pilot querying.
- Both do
- Voice-call testing, 40+ automatic metrics, and production monitoring
- RubricHQ adds
- Synthetic scenarios that work from day one, plus a prompt-rewrite loop
- Roark is known for
- Replaying real production calls (caller voice cloned) against new versions
By Noor, Co-founder, RubricHQ
What Roark is — Roark (YC) is a QA and observability platform for voice AI that centres on replaying real production calls — it clones the original caller's voice and reruns the interaction against your updated agent.
The scorecard
● has it ● limited ● no| Capability | RubricHQ | Roark |
|---|---|---|
| Primary test source | Synthetic scenarios + persona library, generated from your prompt | Replays of real production calls (caller voice cloned) |
| Works before you have traffic | Yes — no production calls required | Limited — replay needs real calls to replay |
| Production call replay | Not a documented feature | Yes — clones the caller's voice, reruns against new logic |
| Evaluation metrics | Code-as-judge, LLM-as-judge, and audio metrics | 40+ built-in metrics — latency, instruction-following, repetition, sentiment |
| Transcription | Built-in ASR for scoring | Enterprise transcription, 50+ languages, ~8.6% WER (per Roark) |
| Production monitoring | Yes — live production call observability with drift alerts | Yes — observability and analytics on live calls |
| 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 | Analytics dashboards; no documented natural-language querying |
| Supported providers | Vapi, Retell, LiveKit, Pipecat | Vapi, Retell, plus Node/Python SDK |
| Pricing | Public — Pay as you go ($0, 200 free credits) or Growth $399/mo, Enterprise custom | From $500/mo; Startup (4,000 min/mo) and Growth (15,000+ min/mo) tiers |
How they differ
Synthetic scenarios vs production replay
RubricHQ writes test scenarios from your agent prompt and runs them as fresh calls with varied personas, so you can test a brand-new agent with zero production traffic. Roark takes calls that already happened and replays them — cloning the caller's voice — against your updated logic, which is a strong regression signal once you have real volume but not available on day one.
Coverage of untested paths
Replaying real calls tells you whether a change broke conversations you have already seen. It does not cover the angry caller, the code-switcher, or the edge case that has not happened yet. RubricHQ's generated adversarial and multilingual personas are designed to surface those before a customer hits them.
Prompt optimization
RubricHQ diagnoses a failing batch, generates a targeted prompt rewrite, proves it against the same suite, and pushes it to Vapi or Retell. Roark focuses on measurement and analytics; acting on the findings is manual.
Using both together
These tools are complementary. A common setup: RubricHQ for pre-launch and CI regression suites against generated scenarios, Roark for replaying high-value production calls after a change. If you can only run one early on, RubricHQ works before you have traffic; Roark needs traffic to be useful.
Frequently asked questions
Is RubricHQ a good Roark alternative?+
Yes, especially before you have production traffic. RubricHQ generates synthetic scenarios and personas so you can test a new voice agent from day one, and adds a prompt-optimization loop. Roark's production call replay is valuable once you have real call volume to replay, and the two are often used together.
What makes Roark different?+
Roark's signature feature is production call replay: it clones the original caller's voice and reruns the full interaction against your updated agent logic, plus 40+ automatic call metrics. RubricHQ's test cases are generated rather than replayed.
How much does Roark cost?+
Roark starts at $500/month, with a Startup tier (up to 4,000 minutes/month) and a Growth tier (15,000+ minutes/month, SOC2 and HIPAA). RubricHQ starts at $0 (pay-as-you-go), with Growth at $399/month.
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Sources · reviewed September 11, 2026
Roark details are drawn from public sources and change over time. Spot something out of date? Tell us.
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