§ The result
2 points separate Emmersion and Mercer | Mettl.
Emmersion holds a 2-point edge over Mercer | Mettl under rubric v1.0, 44 to 42, with both scored in the Assessment cohort. Mercer | Mettl takes 2 of the 7 criteria, Bias Audit Transparency among them, against 4 for Emmersion, whose share includes Article 11 Technical Documentation, and 1 is level. Article 11 Technical Documentation is both the widest raw gap and the heaviest weighted swing — Emmersion 57, Mercer | Mettl 38 — and at a 20% weight it carries 67% of the weighted advantage Emmersion holds across the 4 criteria on that side of the table.
Vendor profile
Emmersion
Emmersion, Rosetta Stone's assessment division within IXL Learning, sells AI-scored adaptive TrueNorth speaking and writing tests and WebCAPE reading and grammar exams. They rate language proficiency on a 0-10 scale mapped to CEFR and ACTFL and are used for pre-employment screening, checking employees' language skills and placing students.
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
Emmersion and Mercer | Mettl are both filed under Assessment AI. They also share 1 secondary category: Screening.
Both are in scope of NYC LL 144, Illinois HB 3773, EU AI Act, Colorado AI Act and Mobley v. Workday.
| Record | Emmersion | Mercer | Mettl |
|---|---|---|
| Price tier | Mid | Mid |
| Headquarters | US | IN |
| Founded | 2015 | 2010 |
§ What decides it
The criteria that move the gap, heaviest swing first.
20% weight · 42% of the movement so far
Article 11 Technical Documentation
Emmersion 57 · Mercer | Mettl 38
3.8 weighted points to Emmersion
18% weight · 70% of the movement so far
Bias Audit Transparency
Emmersion 28 · Mercer | Mettl 42
2.5 weighted points to Mercer | Mettl
12% weight · 81% of the movement so far
Human Oversight Design
Emmersion 53 · Mercer | Mettl 45
1.0 weighted points to Emmersion
15% weight · 90% of the movement so far
Data Governance Disclosure
Emmersion 50 · Mercer | Mettl 55
0.8 weighted points to Mercer | Mettl
8% weight · 97% of the movement so far
Customer Documentation
Emmersion 60 · Mercer | Mettl 52
0.6 weighted points to Emmersion
15% weight · 100% of the movement so far
FRIA Support
Emmersion 30 · Mercer | Mettl 28
0.3 weighted points to Emmersion
Weighted delta is the raw difference times the criterion weight, so the 6 figures above sum to +2.4 — the difference between the two totals before either is rounded. Shares are of 9.0 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 +2.4.
§ Category-by-category
Raw score per criterion, with weighted delta.
Δ is Emmersion minus Mercer | Mettl.
| Category | Weight | Emmersion | Mercer | Mettl | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 57 | 38 | +19 | +3.8 |
| Bias Audit Transparency | 18% | 28 | 42 | -14 | -2.5 |
| FRIA Support | 15% | 30 | 28 | +2 | +0.3 |
| Data Governance Disclosure | 15% | 50 | 55 | -5 | -0.8 |
| Human Oversight Design | 12% | 53 | 45 | +8 | +1.0 |
| Post-Market Monitoring | 12% | 38 | 38 | - | - |
| Customer Documentation | 8% | 60 | 52 | +8 | +0.6 |
| Total | 100% | 44 (F) | 42 (F) | +2 | +2.4 |
§ 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 | Emmersion | Mercer | Mettl | ||||
|---|---|---|---|---|---|---|---|
| Cited | Absences | Audit / hosting | Cited | Absences | Audit / hosting | ||
| Article 11 Technical Documentation | 20% | 4 | 1 | Sources on the vendor's own domainSources on a separate domain | 2 | 1 | Sources on the vendor's own domain |
| Bias Audit Transparency | 18% | 7 | 1 | Sources on the vendor's own domainSources on a separate domain | 0 | 1 | — |
| FRIA Support | 15% | 3 | 1 | Sources on the vendor's own domainSources on a separate domain | 1 | 1 | — |
| Data Governance Disclosure | 15% | 6 | 0 | Sources on the vendor's own domainSources on a separate domain | 2 | 0 | Sources on the vendor's own domain |
| Human Oversight Design | 12% | 6 | 0 | Sources on the vendor's own domain | 2 | 0 | Sources on the vendor's own domain |
| Post-Market Monitoring | 12% | 4 | 1 | Sources on the vendor's own domain | 1 | 1 | Sources on the vendor's own domain |
| Customer Documentation | 8% | 5 | 1 | Sources on the vendor's own domainSources on a separate domain | 1 | 1 | Sources on the vendor's own domain |
| All criteria | 100% | 35 | 5 | Sources on the vendor's own domainSources on a separate domain | 9 | 5 | Sources on the vendor's own domain |
Emmersion has 40 evidence rows across 7 of 7 criteria — 35 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; some documentation or audit rows for Emmersion sit on a domain separate from the vendor's own site.
Provenance
The scores above are documented by 54 evidence rows on file for these two vendors: 40 for Emmersion, across 5 distinct source domains, and 14 for Mercer | Mettl, across 2 distinct source domains.
- Rubric
- v1.0
- Emmersion last reviewed
- September 25, 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