§ The result
Bullhorn leads Mercer | Mettl by 12 points.
Bullhorn sits 12 points above Mercer | Mettl under rubric v1.0 — 54 against 42 — with Bullhorn filed under ATS-integrated and Mercer | Mettl under Assessment. Bullhorn leads 6 of the 7 criteria, including Article 11 Technical Documentation, while Mercer | Mettl leads 1, including Post-Market Monitoring. Article 11 Technical Documentation is the widest raw gap and the heaviest weighted swing at once (Bullhorn 62, Mercer | Mettl 38, 20% weight), but it accounts for only 39% of the weighted advantage Bullhorn holds across the 6 criteria on that side of the table.
Vendor profile
Bullhorn
Bullhorn is a cloud-based applicant tracking system and CRM for staffing and recruiting agencies, with AI features (Bullhorn Copilot/Amplify, automation, and Textkernel-powered search and match) that source, screen, and rank candidates against jobs.
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
Bullhorn is filed under ATS-integrated 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 | Bullhorn | Mercer | Mettl |
|---|---|---|
| Price tier | High | Mid |
| Headquarters | US | IN |
| Founded | 1999 | 2010 |
§ What decides it
The criteria that move the gap, heaviest swing first.
20% weight · 38% of the movement so far
Article 11 Technical Documentation
Bullhorn 62 · Mercer | Mettl 38
4.8 weighted points to Bullhorn
18% weight · 60% of the movement so far
Bias Audit Transparency
Bullhorn 58 · Mercer | Mettl 42
2.9 weighted points to Bullhorn
12% weight · 74% of the movement so far
Human Oversight Design
Bullhorn 60 · Mercer | Mettl 45
1.8 weighted points to Bullhorn
15% weight · 86% of the movement so far
FRIA Support
Bullhorn 38 · Mercer | Mettl 28
1.5 weighted points to Bullhorn
15% weight · 92% of the movement so far
Data Governance Disclosure
Bullhorn 60 · Mercer | Mettl 55
0.8 weighted points to Bullhorn
8% weight · 97% of the movement so far
Customer Documentation
Bullhorn 60 · Mercer | Mettl 52
0.6 weighted points to Bullhorn
12% weight · 100% of the movement so far
Post-Market Monitoring
Bullhorn 35 · Mercer | Mettl 38
0.4 weighted points to Mercer | Mettl
Weighted delta is the raw difference times the criterion weight, so the 7 figures above sum to +12.0 — the difference between the two totals before either is rounded. Shares are of 12.7 points of movement counted without direction. The table below rounds each side to a whole number first, so its Δ raw total reads +12 beside that +12.0.
§ Category-by-category
Raw score per criterion, with weighted delta.
Δ is Bullhorn minus Mercer | Mettl.
| Category | Weight | Bullhorn | Mercer | Mettl | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 62 | 38 | +24 | +4.8 |
| Bias Audit Transparency | 18% | 58 | 42 | +16 | +2.9 |
| FRIA Support | 15% | 38 | 28 | +10 | +1.5 |
| Data Governance Disclosure | 15% | 60 | 55 | +5 | +0.8 |
| Human Oversight Design | 12% | 60 | 45 | +15 | +1.8 |
| Post-Market Monitoring | 12% | 35 | 38 | -3 | -0.4 |
| Customer Documentation | 8% | 60 | 52 | +8 | +0.6 |
| Total | 100% | 54 (F) | 42 (F) | +12 | +12.0 |
§ 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 | Bullhorn | 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% | 3 | 1 | Audit reportSources on the vendor's own domain | 0 | 1 | — |
| FRIA Support | 15% | 1 | 1 | — | 1 | 1 | — |
| Data Governance Disclosure | 15% | 3 | 0 | Sources on the vendor's own domain | 2 | 0 | Sources on the vendor's own domain |
| Human Oversight Design | 12% | 2 | 1 | Sources on the vendor's own domain | 2 | 0 | Sources on the vendor's own domain |
| Post-Market Monitoring | 12% | 1 | 1 | Sources on the vendor's own domain | 1 | 1 | Sources on the vendor's own domain |
| Customer Documentation | 8% | 3 | 1 | Sources on the vendor's own domain | 1 | 1 | Sources on the vendor's own domain |
| All criteria | 100% | 15 | 6 | Audit reportSources on the vendor's own domain | 9 | 5 | Sources on the vendor's own domain |
Bullhorn has 20 evidence rows across 7 of 7 criteria — 15 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.
Provenance
The scores above are documented by 34 evidence rows on file for these two vendors: 20 for Bullhorn, across 2 distinct source domains, and 14 for Mercer | Mettl, across 2 distinct source domains.
- Rubric
- v1.0
- Bullhorn 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