§ The result
Mercer | Mettl takes the total, Personio takes more of the criteria.
Mercer | Mettl (Assessment) edges Personio (ATS-integrated) by 2 points under rubric v1.0, 42 to 40. Personio leads more of the criteria than Mercer | Mettl — 4 to 3 — but Bias Audit Transparency, which Mercer | Mettl leads, carries 18% of the rubric, and the weighted sum still falls to Mercer | Mettl. Bias Audit Transparency is both the widest raw gap and the heaviest weighted swing — Mercer | Mettl 42, Personio 25 — and at an 18% weight it carries 83% of the weighted advantage Mercer | Mettl holds across the 3 criteria on that side of the table.
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.
Vendor profile
Personio
Personio is a European cloud HR platform for small and mid-sized companies that combines an HRIS with recruiting/ATS, time tracking, payroll and an AI assistant, and is adding agentic AI candidate sourcing and application screening through its 2026 acquisition of aurio.
§ The record
Mercer | Mettl is filed under Assessment AI, Personio under ATS-integrated AI. They also share 1 secondary category: Screening.
Both are in scope of NYC LL 144, Illinois HB 3773, EU AI Act and Colorado AI Act. Only Mercer | Mettl is in scope of Mobley v. Workday.
| Record | Mercer | Mettl | Personio |
|---|---|---|
| Price tier | Mid | Mid |
| Headquarters | IN | DE |
| Founded | 2010 | 2015 |
§ What decides it
The criteria that move the gap, heaviest swing first.
18% weight · 52% of the movement so far
Bias Audit Transparency
Mercer | Mettl 42 · Personio 25
3.1 weighted points to Mercer | Mettl
12% weight · 72% of the movement so far
Post-Market Monitoring
Mercer | Mettl 38 · Personio 48
1.2 weighted points to Personio
15% weight · 79% of the movement so far
Data Governance Disclosure
Mercer | Mettl 55 · Personio 52
0.4 weighted points to Mercer | Mettl
20% weight · 86% of the movement so far
Article 11 Technical Documentation
Mercer | Mettl 38 · Personio 40
0.4 weighted points to Personio
12% weight · 92% of the movement so far
Human Oversight Design
Mercer | Mettl 45 · Personio 48
0.4 weighted points to Personio
15% weight · 97% of the movement so far
FRIA Support
Mercer | Mettl 28 · Personio 30
0.3 weighted points to Personio
8% weight · 100% of the movement so far
Customer Documentation
Mercer | Mettl 52 · Personio 50
0.2 weighted points to Mercer | Mettl
Weighted delta is the raw difference times the criterion weight, so the 7 figures above sum to +1.4 — the difference between the two totals before either is rounded. Shares are of 5.9 points of movement counted without direction. The table below rounds each side to a whole number first, so its Δ raw total reads +2 beside that +1.4.
§ Category-by-category
Raw score per criterion, with weighted delta.
Δ is Mercer | Mettl minus Personio.
| Category | Weight | Mercer | Mettl | Personio | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 38 | 40 | -2 | -0.4 |
| Bias Audit Transparency | 18% | 42 | 25 | +17 | +3.1 |
| FRIA Support | 15% | 28 | 30 | -2 | -0.3 |
| Data Governance Disclosure | 15% | 55 | 52 | +3 | +0.4 |
| Human Oversight Design | 12% | 45 | 48 | -3 | -0.4 |
| Post-Market Monitoring | 12% | 38 | 48 | -10 | -1.2 |
| Customer Documentation | 8% | 52 | 50 | +2 | +0.2 |
| Total | 100% | 42 (F) | 40 (F) | +2 | +1.4 |
§ 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 | Mercer | Mettl | Personio | ||||
|---|---|---|---|---|---|---|---|
| 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 domainSources on a separate domain |
| Bias Audit Transparency | 18% | 0 | 1 | — | 2 | 2 | Sources on the vendor's own domain |
| FRIA Support | 15% | 1 | 1 | — | 2 | 1 | Sources on the vendor's own domain |
| Data Governance Disclosure | 15% | 2 | 0 | Sources on the vendor's own domain | 2 | 1 | Sources on the vendor's own domainSources on a separate domain |
| Human Oversight Design | 12% | 2 | 0 | Sources on the vendor's own domain | 2 | 1 | Sources on the vendor's own domainSources on a separate domain |
| Post-Market Monitoring | 12% | 1 | 1 | Sources on the vendor's own domain | 1 | 1 | Sources on the vendor's own domain |
| Customer Documentation | 8% | 1 | 1 | Sources on the vendor's own domain | 2 | 1 | Sources on the vendor's own domain |
| All criteria | 100% | 9 | 5 | Sources on the vendor's own domain | 13 | 8 | Sources on the vendor's own domainSources on a separate domain |
Mercer | Mettl has 14 evidence rows across 7 of 7 criteria — 9 with a source URL, 5 documented absences; Personio has 20 evidence rows across 7 of 7 criteria — 13 with a source URL, 8 documented absences; some documentation or audit rows for Personio sit on a domain separate from the vendor's own site.
Provenance
The scores above are documented by 34 evidence rows on file for these two vendors: 14 for Mercer | Mettl, across 2 distinct source domains, and 20 for Personio, across 5 distinct source domains.
- Rubric
- v1.0
- Mercer | Mettl last reviewed
- June 7, 2026 · HireAIScore editorial team
- Personio last reviewed
- August 2, 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