§ The result
3 points separate Mercer | Mettl and Workstream.
Mercer | Mettl holds a 3-point edge over Workstream under rubric v1.0, 42 to 39, across the Assessment and Screening cohorts. Mercer | Mettl leads 4 of the 7 criteria, including Bias Audit Transparency, while Workstream leads 3, including Human Oversight Design. Bias Audit Transparency is both the widest raw gap and the heaviest weighted swing — Mercer | Mettl 42, Workstream 20 — and at an 18% weight it carries 70% of the weighted advantage Mercer | Mettl holds across the 4 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
Workstream
Workstream is a mobile-first HR, payroll and hiring platform for hourly, multi-location employers such as QSR franchisees. Its hiring suite pairs a text-to-apply applicant tracking system with VoiceAI phone screens and VideoAI asynchronous video interviews, which return transcripts, AI summaries, pass/fail results for each question and match scores.
§ The record
Mercer | Mettl is filed under Assessment AI, Workstream under Screening AI. They also share 1 secondary category: Video interview.
Both are in scope of NYC LL 144, Illinois HB 3773, EU AI Act, Colorado AI Act and Mobley v. Workday.
| Record | Mercer | Mettl | Workstream |
|---|---|---|
| Price tier | Mid | Mid |
| Headquarters | IN | US |
| Founded | 2010 | 2017 |
§ What decides it
The criteria that move the gap, heaviest swing first.
18% weight · 48% of the movement so far
Bias Audit Transparency
Mercer | Mettl 42 · Workstream 20
4.0 weighted points to Mercer | Mettl
12% weight · 71% of the movement so far
Human Oversight Design
Mercer | Mettl 45 · Workstream 61
1.9 weighted points to Workstream
15% weight · 85% of the movement so far
Data Governance Disclosure
Mercer | Mettl 55 · Workstream 47
1.2 weighted points to Mercer | Mettl
20% weight · 90% of the movement so far
Article 11 Technical Documentation
Mercer | Mettl 38 · Workstream 40
0.4 weighted points to Workstream
12% weight · 94% of the movement so far
Post-Market Monitoring
Mercer | Mettl 38 · Workstream 35
0.4 weighted points to Mercer | Mettl
8% weight · 98% of the movement so far
Customer Documentation
Mercer | Mettl 52 · Workstream 56
0.3 weighted points to Workstream
15% weight · 100% of the movement so far
FRIA Support
Mercer | Mettl 28 · Workstream 27
0.1 weighted points to Mercer | Mettl
Weighted delta is the raw difference times the criterion weight, so the 7 figures above sum to +3.0 — the difference between the two totals before either is rounded. Shares are of 8.3 points of movement counted without direction. The table below rounds each side to a whole number first, so its Δ raw total reads +3 beside that +3.0.
§ Category-by-category
Raw score per criterion, with weighted delta.
Δ is Mercer | Mettl minus Workstream.
| Category | Weight | Mercer | Mettl | Workstream | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 38 | 40 | -2 | -0.4 |
| Bias Audit Transparency | 18% | 42 | 20 | +22 | +4.0 |
| FRIA Support | 15% | 28 | 27 | +1 | +0.1 |
| Data Governance Disclosure | 15% | 55 | 47 | +8 | +1.2 |
| Human Oversight Design | 12% | 45 | 61 | -16 | -1.9 |
| Post-Market Monitoring | 12% | 38 | 35 | +3 | +0.4 |
| Customer Documentation | 8% | 52 | 56 | -4 | -0.3 |
| Total | 100% | 42 (F) | 39 (F) | +3 | +3.0 |
§ 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 | Workstream | ||||
|---|---|---|---|---|---|---|---|
| Cited | Absences | Audit / hosting | Cited | Absences | Audit / hosting | ||
| Article 11 Technical Documentation | 20% | 2 | 1 | Sources on the vendor's own domain | 3 | 1 | Sources on the vendor's own domain |
| Bias Audit Transparency | 18% | 0 | 1 | — | 5 | 1 | 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 | 4 | 1 | Sources on the vendor's own domain |
| Human Oversight Design | 12% | 2 | 0 | Sources on the vendor's own domain | 7 | 0 | Sources on the vendor's own domain |
| Post-Market Monitoring | 12% | 1 | 1 | Sources on the vendor's own domain | 3 | 1 | Sources on the vendor's own domainSources on a separate domain |
| Customer Documentation | 8% | 1 | 1 | Sources on the vendor's own domain | 4 | 1 | Sources on the vendor's own domain |
| All criteria | 100% | 9 | 5 | Sources on the vendor's own domain | 28 | 6 | 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; Workstream has 34 evidence rows across 7 of 7 criteria — 28 with a source URL, 6 documented absences; some documentation or audit rows for Workstream sit on a domain separate from the vendor's own site.
Provenance
The scores above are documented by 48 evidence rows on file for these two vendors: 14 for Mercer | Mettl, across 2 distinct source domains, and 34 for Workstream, across 2 distinct source domains.
- Rubric
- v1.0
- Mercer | Mettl last reviewed
- June 7, 2026 · HireAIScore editorial team
- Workstream last reviewed
- September 25, 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