§ The result
Gem leads Mercer | Mettl on all 7 criteria.
Gem sits 13 points above Mercer | Mettl under rubric v1.0 — 55 against 42 — with Gem filed under Sourcing and Mercer | Mettl under Assessment. Gem leads every one of the 7 criteria, Mercer | Mettl none of them, and the closest of the 7 is Data Governance Disclosure, Gem 57 to Mercer | Mettl 55. Bias Audit Transparency is the widest raw gap and the heaviest weighted swing at once (Gem 66, Mercer | Mettl 42, 18% weight), but it accounts for only 32% of the weighted advantage Gem holds across the 7 criteria on that side of the table.
Vendor profile
Gem
Gem is an AI-first recruiting platform combining a talent CRM, AI sourcing and outreach automation, candidate engagement, and a newer applicant tracking system with AI-powered application review and ranking.
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
Gem is filed under Candidate sourcing AI, Mercer | Mettl under Assessment AI. They also share 1 secondary category: Screening.
Both are in scope of EU AI Act, NYC LL 144, Colorado AI Act and Illinois HB 3773. Only Mercer | Mettl is in scope of Mobley v. Workday.
| Record | Gem | Mercer | Mettl |
|---|---|---|
| Price tier | High | Mid |
| Headquarters | US | IN |
| Founded | 2017 | 2010 |
§ What decides it
The criteria that move the gap, heaviest swing first.
18% weight · 32% of the movement so far
Bias Audit Transparency
Gem 66 · Mercer | Mettl 42
4.3 weighted points to Gem
20% weight · 62% of the movement so far
Article 11 Technical Documentation
Gem 58 · Mercer | Mettl 38
4.0 weighted points to Gem
12% weight · 76% of the movement so far
Human Oversight Design
Gem 61 · Mercer | Mettl 45
1.9 weighted points to Gem
12% weight · 84% of the movement so far
Post-Market Monitoring
Gem 47 · Mercer | Mettl 38
1.1 weighted points to Gem
15% weight · 92% of the movement so far
FRIA Support
Gem 35 · Mercer | Mettl 28
1.1 weighted points to Gem
8% weight · 98% of the movement so far
Customer Documentation
Gem 62 · Mercer | Mettl 52
0.8 weighted points to Gem
15% weight · 100% of the movement so far
Data Governance Disclosure
Gem 57 · Mercer | Mettl 55
0.3 weighted points to Gem
Weighted delta is the raw difference times the criterion weight, so the 7 figures above sum to +13.5 — the difference between the two totals before either is rounded. Shares are of 13.5 points of movement counted without direction. The table below rounds each side to a whole number first, so its Δ raw total reads +13 beside that +13.5.
§ Category-by-category
Raw score per criterion, with weighted delta.
Δ is Gem minus Mercer | Mettl.
| Category | Weight | Gem | Mercer | Mettl | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 58 | 38 | +20 | +4.0 |
| Bias Audit Transparency | 18% | 66 | 42 | +24 | +4.3 |
| FRIA Support | 15% | 35 | 28 | +7 | +1.1 |
| Data Governance Disclosure | 15% | 57 | 55 | +2 | +0.3 |
| Human Oversight Design | 12% | 61 | 45 | +16 | +1.9 |
| Post-Market Monitoring | 12% | 47 | 38 | +9 | +1.1 |
| Customer Documentation | 8% | 62 | 52 | +10 | +0.8 |
| Total | 100% | 55 (F) | 42 (F) | +13 | +13.5 |
§ 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 | Gem | Mercer | Mettl | ||||
|---|---|---|---|---|---|---|---|
| Cited | Absences | Audit / hosting | Cited | Absences | Audit / hosting | ||
| Article 11 Technical Documentation | 20% | 2 | 1 | Audit reportSources on the vendor's own domainSources on a separate domain | 2 | 1 | Sources on the vendor's own domain |
| Bias Audit Transparency | 18% | 3 | 0 | Audit reportSources on the vendor's own domainSources on a separate domain | 0 | 1 | — |
| FRIA Support | 15% | 2 | 1 | Sources on the vendor's own domain | 1 | 1 | — |
| Data Governance Disclosure | 15% | 3 | 0 | Audit reportSources on the vendor's own domain | 2 | 0 | Sources on the vendor's own domain |
| Human Oversight Design | 12% | 3 | 0 | Audit reportSources on the vendor's own domainSources on a separate domain | 2 | 0 | Sources on the vendor's own domain |
| Post-Market Monitoring | 12% | 3 | 0 | 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% | 19 | 2 | Audit reportSources on the vendor's own domainSources on a separate domain | 9 | 5 | Sources on the vendor's own domain |
Gem has 21 evidence rows across 7 of 7 criteria — 19 with a source URL, 2 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 Gem sit on a domain separate from the vendor's own site.
Provenance
The scores above are documented by 35 evidence rows on file for these two vendors: 21 for Gem, across 2 distinct source domains, and 14 for Mercer | Mettl, across 2 distinct source domains.
- Rubric
- v1.0
- Gem 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