§ The result
Mercer | Mettl leads Aon Assessment by 7 points.
Mercer | Mettl scores 42 and Aon Assessment 35 under rubric v1.0 — a 7-point gap inside the Assessment cohort. Mercer | Mettl leads 5 of the 7 criteria, including Data Governance Disclosure, while Aon Assessment leads 1, including Article 11 Technical Documentation, and 1 is level. Data Governance Disclosure is the widest raw gap and the heaviest weighted swing at once (Aon Assessment 38, Mercer | Mettl 55, 15% weight), but it accounts for only 36% of the weighted advantage Mercer | Mettl holds across the 5 criteria on that side of the table.
Vendor profile
Aon Assessment
Aon Assessment Solutions (formerly cut-e) provides enterprise pre-hire psychometric assessments - ability, personality (ADEPT-15), situational-judgement, gamified cognitive (smartPredict/gridChallenge) tests and an AI-scored video interview tool (vidAssess-AI) - used to screen and rank job applicants at scale.
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
Aon Assessment and Mercer | Mettl are both filed under Assessment AI. They also share 2 secondary categories: Video interview and Screening.
Both are in scope of NYC LL 144, Illinois HB 3773, EU AI Act, Colorado AI Act and Mobley v. Workday.
| Record | Aon Assessment | Mercer | Mettl |
|---|---|---|
| Price tier | Enterprise | Mid |
| Headquarters | DE | IN |
| Founded | 2002 | 2010 |
§ What decides it
The criteria that move the gap, heaviest swing first.
15% weight · 34% of the movement so far
Data Governance Disclosure
Aon Assessment 38 · Mercer | Mettl 55
2.5 weighted points to Mercer | Mettl
18% weight · 63% of the movement so far
Bias Audit Transparency
Aon Assessment 30 · Mercer | Mettl 42
2.2 weighted points to Mercer | Mettl
12% weight · 84% of the movement so far
Post-Market Monitoring
Aon Assessment 25 · Mercer | Mettl 38
1.6 weighted points to Mercer | Mettl
15% weight · 90% of the movement so far
FRIA Support
Aon Assessment 25 · Mercer | Mettl 28
0.4 weighted points to Mercer | Mettl
20% weight · 96% of the movement so far
Article 11 Technical Documentation
Aon Assessment 40 · Mercer | Mettl 38
0.4 weighted points to Aon Assessment
8% weight · 100% of the movement so far
Customer Documentation
Aon Assessment 48 · Mercer | Mettl 52
0.3 weighted points to Mercer | Mettl
Weighted delta is the raw difference times the criterion weight, so the 6 figures above sum to -6.6 — the difference between the two totals before either is rounded. Shares are of 7.4 points of movement counted without direction. The table below rounds each side to a whole number first, so its Δ raw total reads -7 beside that -6.6.
§ Category-by-category
Raw score per criterion, with weighted delta.
Δ is Aon Assessment minus Mercer | Mettl.
| Category | Weight | Aon Assessment | Mercer | Mettl | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 40 | 38 | +2 | +0.4 |
| Bias Audit Transparency | 18% | 30 | 42 | -12 | -2.2 |
| FRIA Support | 15% | 25 | 28 | -3 | -0.4 |
| Data Governance Disclosure | 15% | 38 | 55 | -17 | -2.5 |
| Human Oversight Design | 12% | 45 | 45 | - | - |
| Post-Market Monitoring | 12% | 25 | 38 | -13 | -1.6 |
| Customer Documentation | 8% | 48 | 52 | -4 | -0.3 |
| Total | 100% | 35 (F) | 42 (F) | -7 | -6.6 |
§ 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 | Aon Assessment | 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% | 1 | 1 | Audit reportSources on a separate domain | 0 | 1 | — |
| FRIA Support | 15% | 1 | 1 | Sources on the vendor's own domain | 1 | 1 | — |
| Data Governance Disclosure | 15% | 2 | 1 | Sources on the vendor's own domain | 2 | 0 | Sources on the vendor's own domain |
| Human Oversight Design | 12% | 2 | 0 | Sources on the vendor's own domain | 2 | 0 | Sources on the vendor's own domain |
| Post-Market Monitoring | 12% | 1 | 1 | — | 1 | 1 | Sources on the vendor's own domain |
| Customer Documentation | 8% | 2 | 1 | Sources on the vendor's own domain | 1 | 1 | Sources on the vendor's own domain |
| All criteria | 100% | 11 | 6 | Audit reportSources on the vendor's own domainSources on a separate domain | 9 | 5 | Sources on the vendor's own domain |
Aon Assessment has 17 evidence rows across 7 of 7 criteria — 11 with a source URL, 6 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 Aon Assessment sit on a domain separate from the vendor's own site.
Provenance
The scores above are documented by 31 evidence rows on file for these two vendors: 17 for Aon Assessment, across 3 distinct source domains, and 14 for Mercer | Mettl, across 2 distinct source domains.
- Rubric
- v1.0
- Aon Assessment 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