§ The result
ADP leads Mercer | Mettl on 6 of the 7 criteria.
ADP scores 48 and Mercer | Mettl 42 under rubric v1.0, a 6-point gap across the ATS-integrated and Assessment cohorts. ADP leads 6 of the 7 criteria and the remaining criterion is level, so Mercer | Mettl is ahead on none of them; the closest of the 6 ADP leads is Data Governance Disclosure, ADP 57 to Mercer | Mettl 55. Article 11 Technical Documentation is both the widest raw gap and the heaviest weighted swing — ADP 53, Mercer | Mettl 38 — and at a 20% weight it carries 46% of the weighted advantage ADP holds across the 6 criteria on that side of the table.
Vendor profile
ADP
ADP is an enterprise human capital management and payroll provider whose recruiting suite uses AI to parse, rank, and match job applicants via its Candidate Relevancy tool, ADP Assist generative-AI assistant/job-description generator, and skills intelligence.
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
ADP is filed under ATS-integrated AI, Mercer | Mettl under Assessment AI. They also share 1 secondary category: Screening.
Both are in scope of EU AI Act, NYC LL 144, Colorado AI Act and Illinois HB 3773. Only Mercer | Mettl is in scope of Mobley v. Workday.
| Record | ADP | Mercer | Mettl |
|---|---|---|
| Price tier | Enterprise | Mid |
| Headquarters | US | IN |
| Founded | 1949 | 2010 |
§ What decides it
The criteria that move the gap, heaviest swing first.
20% weight · 46% of the movement so far
Article 11 Technical Documentation
ADP 53 · Mercer | Mettl 38
3.0 weighted points to ADP
12% weight · 64% of the movement so far
Human Oversight Design
ADP 55 · Mercer | Mettl 45
1.2 weighted points to ADP
12% weight · 77% of the movement so far
Post-Market Monitoring
ADP 45 · Mercer | Mettl 38
0.8 weighted points to ADP
18% weight · 88% of the movement so far
Bias Audit Transparency
ADP 46 · Mercer | Mettl 42
0.7 weighted points to ADP
8% weight · 95% of the movement so far
Customer Documentation
ADP 58 · Mercer | Mettl 52
0.5 weighted points to ADP
15% weight · 100% of the movement so far
Data Governance Disclosure
ADP 57 · Mercer | Mettl 55
0.3 weighted points to ADP
Weighted delta is the raw difference times the criterion weight, so the 6 figures above sum to +6.5 — the difference between the two totals before either is rounded. Shares are of 6.5 points of movement counted without direction. The table below rounds each side to a whole number first, so its Δ raw total reads +6 beside that +6.5.
§ Category-by-category
Raw score per criterion, with weighted delta.
Δ is ADP minus Mercer | Mettl.
| Category | Weight | ADP | Mercer | Mettl | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 53 | 38 | +15 | +3.0 |
| Bias Audit Transparency | 18% | 46 | 42 | +4 | +0.7 |
| FRIA Support | 15% | 28 | 28 | - | - |
| Data Governance Disclosure | 15% | 57 | 55 | +2 | +0.3 |
| Human Oversight Design | 12% | 55 | 45 | +10 | +1.2 |
| Post-Market Monitoring | 12% | 45 | 38 | +7 | +0.8 |
| Customer Documentation | 8% | 58 | 52 | +6 | +0.5 |
| Total | 100% | 48 (F) | 42 (F) | +6 | +6.5 |
§ 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 | ADP | 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% | 2 | 1 | Sources on the vendor's own domain | 0 | 1 | — |
| FRIA Support | 15% | 1 | 1 | Sources on the vendor's own domain | 1 | 1 | — |
| Data Governance Disclosure | 15% | 4 | 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% | 3 | 1 | Sources on the vendor's own domain | 1 | 1 | Sources on the vendor's own domain |
| Customer Documentation | 8% | 3 | 1 | Sources on the vendor's own domain | 1 | 1 | Sources on the vendor's own domain |
| All criteria | 100% | 18 | 5 | Sources on the vendor's own domain | 9 | 5 | Sources on the vendor's own domain |
ADP has 23 evidence rows across 7 of 7 criteria — 18 with a source URL, 5 documented absences; Mercer | Mettl has 14 evidence rows across 7 of 7 criteria — 9 with a source URL, 5 documented absences.
Provenance
The scores above are documented by 37 evidence rows on file for these two vendors: 23 for ADP, across 2 distinct source domains, and 14 for Mercer | Mettl, across 2 distinct source domains.
- Rubric
- v1.0
- ADP last reviewed
- July 17, 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