Built for ATS platforms, AI interview tools, and BPOs who need CEFR language scoring without forcing candidates into a separate test. One API call—instant proficiency data from any conversation.
Question-agnostic CEFR scoring (A1–C2)
85-90% accuracy vs PhD linguists
4-minute assessments, not 30
Works with any audio or video input
{
"cefr_level": "B2",
"confidence": 0.92,
"fluency_score": 78,
"pronunciation_score": 82,
"vocabulary_richness": 74,
"accent_clarity": "high",
"assessment_duration": "3m 42s"
}Send us any interview audio or video. Get back CEFR scores, detailed metrics, and fraud detection—all in under 4 minutes.
Send interview recordings via API. Works with one-way interviews, two-way calls, AI interviews—any format.
Our glass-box AI evaluates fluency, pronunciation, vocabulary, and accent— question-agnostic, bias-aware.
Receive structured JSON with CEFR level, detailed scores, explainable reasoning, and fraud flags.
POST /api/v1/assess
Content-Type: multipart/form-data
{
"audio_url": "https://your-bucket/interview.mp3",
"format": "one_way_interview",
"language": "en",
"include_transcript": true
}{
"assessment_id": "assess_7xK9mPq",
"cefr_level": "B2",
"cefr_confidence": 0.92,
"fluency": {
"score": 78,
"words_per_minute": 142,
"hesitation_ratio": 0.08
},
"pronunciation": {
"score": 82,
"accent_clarity": "high",
"intelligibility": 0.91
},
"vocabulary": {
"score": 74,
"diversity_index": 0.68,
"appropriateness": "professional"
},
"fraud_flags": {
"multiple_speakers": false,
"reading_detected": false,
"ai_generated": false
},
"processing_time_ms": 12400
}Words per minute, natural flow, micro-pauses, hesitation patterns
Clarity, intelligibility, accent characteristics, phoneme accuracy
Diversity index, context appropriateness, professional terminology
Multiple speakers, reading detection, AI-generated response flags
Validated against industry-leading assessments and PhD linguist evaluations. Trusted by Fortune 100 enterprises for call center hiring at scale.
Language assessment is a premium feature your clients will pay for
All-in-one beats fragmented solutions every time
Assessment data lives in your platform—they can't easily leave
Skip 18+ months of R&D. Ship in weeks.
Candidates don't need a separate 30-min language session
The interview IS the assessment—zero change management
CEFR-aligned results they can show to their clients
Language screening in minutes, not days
The market splits into expensive standalone tests and raw speech engines. ZenHire is the only solution that combines interview context with language assessment—no separate test required.
| Capability | ZenHire API | Traditional Assessments | Scenario-Based Tools | Speech Engines |
|---|---|---|---|---|
| Question-agnostic (works on any interview) | ✓ | — | — | ✓ |
| CEFR-level output | ✓ | ✓ | ✓ | Partial |
| Interview context awareness | ✓ | — | — | — |
| No separate test session needed | ✓ | — | — | ✓ |
| Fraud detection (AI, multiple speakers) | ✓ | — | Partial | — |
| White-label / embeddable | ✓ | — | Limited | ✓ |
| Glass-box explainable AI | ✓ | — | — | — |
| Assessment time | ~4 min | 22-30 min | 15-30 min | Real-time |
| Price per assessment | ~$1 | $15-68 | $10-60 | $0.01-0.03 |
They require candidates to take a separate 22-30 minute structured test. Costly ($15-68/test) and adds friction to your hiring flow.
ZenHire: Same quality, 68x cheaper, 7x faster, no extra session.
They have their own scenario-based questions. You can't use their assessment on YOUR interview content—candidates must do theirs separately.
ZenHire: Invisible assessment from any conversation you're already running.
Building speech AI takes 18+ months and $500K+ in specialized ML talent. Then you need bias auditing, GDPR compliance, and ongoing maintenance.
ZenHire: Production-ready API. Integrate in weeks, not years.
Whether you're a platform adding language capabilities or a BPO replacing expensive assessments—ZenHire adapts to your workflow.
20-500 employees • HR Tech companies
Your clients want assessment built-in, but they leave your platform for standalone tests. That's revenue walking out the door.
Embed CEFR scoring natively. Clients get language assessment inside YOUR ATS—no extra vendor, no extra cost to them.
Higher ACV, better close rate, stickier clients. Assessment data lives in your platform.
Independently audited security controls for data protection, availability, and confidentiality.
Full European data protection compliance with right to explanation and data minimization.
Glass-box architecture meets transparency requirements. Fully auditable AI decisions.
Unlike black-box models, every ZenHire decision can be traced, audited, and explained.
In a blind study on 600+ candidates, ZenHire matched industry-leading assessments—in a fraction of the time.
Pay only for what you use. Select your plan.
1 credit = 1 minute of audio processing
Need more than 22K minutes? Contact us for custom enterprise pricing.
Start with a pilot on 50-100 assessments. See accuracy firsthand—scale when you're convinced.