§ The result
1 point separates CodeSignal and Mercer | Mettl.
Within the Assessment cohort, CodeSignal edges Mercer | Mettl by 1 point under rubric v1.0, 43 to 42. CodeSignal leads 3 of the 7 criteria, including Human Oversight Design, while Mercer | Mettl leads 2, including Data Governance Disclosure, and 2 are level. Human Oversight Design is both the widest raw gap and the heaviest weighted swing — CodeSignal 55, Mercer | Mettl 45 — and at a 12% weight it carries 47% of the weighted advantage CodeSignal holds across the 3 criteria on that side of the table.
Vendor profile
CodeSignal
CodeSignal is a technical skills assessment and interview platform for developer hiring that adds AI features including an AI Interviewer, AI-assisted/agentic coding assessments, and AI-plus-human proctoring.
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
CodeSignal 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 | CodeSignal | Mercer | Mettl |
|---|---|---|
| Price tier | Enterprise | Mid |
| Headquarters | US | IN |
| Founded | 2015 | 2010 |
§ What decides it
The criteria that move the gap, heaviest swing first.
12% weight · 32% of the movement so far
Human Oversight Design
CodeSignal 55 · Mercer | Mettl 45
1.2 weighted points to CodeSignal
8% weight · 53% of the movement so far
Customer Documentation
CodeSignal 62 · Mercer | Mettl 52
0.8 weighted points to CodeSignal
15% weight · 74% of the movement so far
Data Governance Disclosure
CodeSignal 50 · Mercer | Mettl 55
0.8 weighted points to Mercer | Mettl
18% weight · 88% of the movement so far
Bias Audit Transparency
CodeSignal 45 · Mercer | Mettl 42
0.5 weighted points to CodeSignal
15% weight · 100% of the movement so far
FRIA Support
CodeSignal 25 · Mercer | Mettl 28
0.4 weighted points to Mercer | Mettl
Weighted delta is the raw difference times the criterion weight, so the 5 figures above sum to +1.3 — the difference between the two totals before either is rounded. Shares are of 3.7 points of movement counted without direction. The table below rounds each side to a whole number first, so its Δ raw total reads +1 beside that +1.3.
§ Category-by-category
Raw score per criterion, with weighted delta.
Δ is CodeSignal minus Mercer | Mettl.
| Category | Weight | CodeSignal | Mercer | Mettl | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 38 | 38 | - | - |
| Bias Audit Transparency | 18% | 45 | 42 | +3 | +0.5 |
| FRIA Support | 15% | 25 | 28 | -3 | -0.4 |
| Data Governance Disclosure | 15% | 50 | 55 | -5 | -0.8 |
| Human Oversight Design | 12% | 55 | 45 | +10 | +1.2 |
| Post-Market Monitoring | 12% | 38 | 38 | - | - |
| Customer Documentation | 8% | 62 | 52 | +10 | +0.8 |
| Total | 100% | 43 (F) | 42 (F) | +1 | +1.3 |
§ 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 | CodeSignal | 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% | 2 | 1 | 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 | Sources on the vendor's own 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% | 15 | 5 | Sources on the vendor's own domain | 9 | 5 | Sources on the vendor's own domain |
CodeSignal has 20 evidence rows across 7 of 7 criteria — 15 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 34 evidence rows on file for these two vendors: 20 for CodeSignal, across 1 distinct source domain, and 14 for Mercer | Mettl, across 2 distinct source domains.
- Rubric
- v1.0
- CodeSignal 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