§ The result
HeyMilo leads Mercer | Mettl on all 7 criteria.
HeyMilo finishes 19 points clear of Mercer | Mettl under rubric v1.0 — 61 (D) against 42 (F) — across the Screening and Assessment cohorts. HeyMilo leads every one of the 7 criteria, Mercer | Mettl none of them, and the closest of the 7 is Data Governance Disclosure, HeyMilo 62 to Mercer | Mettl 55. Bias Audit Transparency is the widest raw gap and the heaviest weighted swing at once (HeyMilo 83, Mercer | Mettl 42, 18% weight), but it accounts for only 39% of the weighted advantage HeyMilo holds across the 7 criteria on that side of the table.
Vendor profile
HeyMilo
HeyMilo is an AI recruiter for high-volume hiring whose voice and video AI agent conducts and scores async and live conversational screening interviews against recruiter-defined rubrics and syncs results to the customer's ATS.
Vendor profile
Mercer | Mettl
Mercer | Mettl is an online talent assessment and remote-proctoring platform offering psychometric, aptitude, coding, and skills tests plus AI-assisted exam proctoring and scoring for hiring, certification, and L&D.
§ The record
HeyMilo is filed under Screening AI, Mercer | Mettl under Assessment AI. They also share 1 secondary category: Video interview.
Both are in scope of EU AI Act, NYC LL 144, Illinois HB 3773, Colorado AI Act and Mobley v. Workday.
| Record | HeyMilo | Mercer | Mettl |
|---|---|---|
| Price tier | Mid | Mid |
| Headquarters | US | IN |
| Founded | 2023 | 2010 |
§ What decides it
The criteria that move the gap, heaviest swing first.
18% weight · 39% of the movement so far
Bias Audit Transparency
HeyMilo 83 · Mercer | Mettl 42
7.4 weighted points to HeyMilo
20% weight · 60% of the movement so far
Article 11 Technical Documentation
HeyMilo 58 · Mercer | Mettl 38
4.0 weighted points to HeyMilo
12% weight · 72% of the movement so far
Human Oversight Design
HeyMilo 64 · Mercer | Mettl 45
2.3 weighted points to HeyMilo
15% weight · 83% of the movement so far
FRIA Support
HeyMilo 42 · Mercer | Mettl 28
2.1 weighted points to HeyMilo
8% weight · 89% of the movement so far
Customer Documentation
HeyMilo 66 · Mercer | Mettl 52
1.1 weighted points to HeyMilo
15% weight · 95% of the movement so far
Data Governance Disclosure
HeyMilo 62 · Mercer | Mettl 55
1.1 weighted points to HeyMilo
12% weight · 100% of the movement so far
Post-Market Monitoring
HeyMilo 46 · Mercer | Mettl 38
1.0 weighted points to HeyMilo
Weighted delta is the raw difference times the criterion weight, so the 7 figures above sum to +18.9 — the difference between the two totals before either is rounded. Shares are of 18.9 points of movement counted without direction. The table below rounds each side to a whole number first, so its Δ raw total reads +19 beside that +18.9.
§ Category-by-category
Raw score per criterion, with weighted delta.
Δ is HeyMilo minus Mercer | Mettl.
| Category | Weight | HeyMilo | Mercer | Mettl | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 58 | 38 | +20 | +4.0 |
| Bias Audit Transparency | 18% | 83 | 42 | +41 | +7.4 |
| FRIA Support | 15% | 42 | 28 | +14 | +2.1 |
| Data Governance Disclosure | 15% | 62 | 55 | +7 | +1.1 |
| Human Oversight Design | 12% | 64 | 45 | +19 | +2.3 |
| Post-Market Monitoring | 12% | 46 | 38 | +8 | +1.0 |
| Customer Documentation | 8% | 66 | 52 | +14 | +1.1 |
| Total | 100% | 61 (D) | 42 (F) | +19 | +18.9 |
§ Evidence
Cited sources and documented absences, criterion by criterion.
An absence is a finding, not a blank: the reviewer looked for a named artefact and recorded that it is not located. Where a source sits is a fact about hosting only.
| Criterion | Weight | HeyMilo | Mercer | Mettl | ||||
|---|---|---|---|---|---|---|---|
| Cited | Absences | Audit / hosting | Cited | Absences | Audit / hosting | ||
| Article 11 Technical Documentation | 20% | 2 | 1 | Sources on the vendor's own domain | 2 | 1 | Sources on the vendor's own domain |
| Bias Audit Transparency | 18% | 3 | 0 | Audit reportSources on a separate domain | 0 | 1 | — |
| FRIA Support | 15% | 2 | 1 | Sources on the vendor's own domain | 1 | 1 | — |
| Data Governance Disclosure | 15% | 3 | 0 | Sources on the vendor's own domain | 2 | 0 | Sources on the vendor's own domain |
| Human Oversight Design | 12% | 3 | 0 | Sources on the vendor's own domain | 2 | 0 | Sources on the vendor's own domain |
| Post-Market Monitoring | 12% | 2 | 1 | Audit reportSources on a separate domain | 1 | 1 | Sources on the vendor's own domain |
| Customer Documentation | 8% | 3 | 0 | Sources on the vendor's own domain | 1 | 1 | Sources on the vendor's own domain |
| All criteria | 100% | 18 | 3 | Audit reportSources on the vendor's own domainSources on a separate domain | 9 | 5 | Sources on the vendor's own domain |
HeyMilo has 21 evidence rows across 7 of 7 criteria — 18 with a source URL, 3 documented absences; Mercer | Mettl has 14 evidence rows across 7 of 7 criteria — 9 with a source URL, 5 documented absences; some documentation or audit rows for HeyMilo sit on a domain separate from the vendor's own site.
Provenance
The scores above are documented by 35 evidence rows on file for these two vendors: 21 for HeyMilo, across 2 distinct source domains, and 14 for Mercer | Mettl, across 2 distinct source domains.
- Rubric
- v1.0
- HeyMilo last reviewed
- June 7, 2026 · HireAIScore editorial team
- Mercer | Mettl last reviewed
- June 7, 2026 · HireAIScore editorial team
HireAIScore scores are editorial research, not legal advice, and no vendor pays for placement, scoring or removal — see the methodology, conflicts policy and terms.
§ Where next