§ The result
Plum leads Mercor on all 7 criteria.
Rubric v1.0 puts 31 points between Plum (Assessment) and Mercor (Screening): 54 for Plum, 23 for Mercor. Plum leads every one of the 7 criteria and 4 of them by 20 raw points or more, Bias Audit Transparency among them; Mercor leads none. Bias Audit Transparency is both the widest raw gap and the heaviest weighted swing — Mercor 10, Plum 83 — and at an 18% weight it carries 42% of the weighted advantage Plum holds across the 7 criteria on that side of the table.
Vendor profile
Mercor
Mercor is an AI talent platform that runs automated 20-minute AI video interviews and semantic resume/profile matching to vet, score, and place candidates and expert contractors, and offers an enterprise applicant-screening product that scores employers' applicant pools against role rubrics with pass/fail recommendations.
Vendor profile
Plum
Plum is a pre-employment talent assessment platform that uses a Five-Factor (Big Five) psychometric Discovery Survey and a Talent Match model to score and rank candidates on behavioral "durable skills" for role fit, hiring, and development.
§ The record
Mercor is filed under Screening AI, Plum under Assessment AI. They record no secondary category in common.
Both are in scope of EU AI Act, NYC LL 144, Colorado AI Act, Illinois HB 3773 and Mobley v. Workday.
| Record | Mercor | Plum |
|---|---|---|
| Price tier | Enterprise | Mid |
| Headquarters | US | CA |
| Founded | 2023 | 2012 |
§ What decides it
The criteria that move the gap, heaviest swing first.
18% weight · 42% of the movement so far
Bias Audit Transparency
Mercor 10 · Plum 83
13.1 weighted points to Plum
20% weight · 65% of the movement so far
Article 11 Technical Documentation
Mercor 22 · Plum 58
7.2 weighted points to Plum
15% weight · 80% of the movement so far
Data Governance Disclosure
Mercor 22 · Plum 54
4.8 weighted points to Plum
12% weight · 86% of the movement so far
Post-Market Monitoring
Mercor 20 · Plum 36
1.9 weighted points to Plum
8% weight · 92% of the movement so far
Customer Documentation
Mercor 40 · Plum 63
1.8 weighted points to Plum
15% weight · 96% of the movement so far
FRIA Support
Mercor 20 · Plum 28
1.2 weighted points to Plum
12% weight · 100% of the movement so far
Human Oversight Design
Mercor 42 · Plum 52
1.2 weighted points to Plum
Weighted delta is the raw difference times the criterion weight, so the 7 figures above sum to -31.3 — the difference between the two totals before either is rounded. Shares are of 31.3 points of movement counted without direction. The table below rounds each side to a whole number first, so its Δ raw total reads -31 beside that -31.3.
§ Category-by-category
Raw score per criterion, with weighted delta.
Δ is Mercor minus Plum.
| Category | Weight | Mercor | Plum | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 22 | 58 | -36 | -7.2 |
| Bias Audit Transparency | 18% | 10 | 83 | -73 | -13.1 |
| FRIA Support | 15% | 20 | 28 | -8 | -1.2 |
| Data Governance Disclosure | 15% | 22 | 54 | -32 | -4.8 |
| Human Oversight Design | 12% | 42 | 52 | -10 | -1.2 |
| Post-Market Monitoring | 12% | 20 | 36 | -16 | -1.9 |
| Customer Documentation | 8% | 40 | 63 | -23 | -1.8 |
| Total | 100% | 23 (F) | 54 (F) | -31 | -31.3 |
§ 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 | Mercor | Plum | ||||
|---|---|---|---|---|---|---|---|
| Cited | Absences | Audit / hosting | Cited | Absences | Audit / hosting | ||
| Article 11 Technical Documentation | 20% | 1 | 1 | Sources on the vendor's own domain | 3 | 0 | Sources on the vendor's own domain |
| Bias Audit Transparency | 18% | 1 | 1 | — | 3 | 0 | Audit reportSources on the vendor's own domain |
| FRIA Support | 15% | 1 | 2 | — | 0 | 1 | — |
| Data Governance Disclosure | 15% | 2 | 1 | Sources on the vendor's own domain | 2 | 1 | Sources on the vendor's own domain |
| Human Oversight Design | 12% | 2 | 1 | Sources on the vendor's own domain | 2 | 1 | Audit reportSources on the vendor's own domain |
| Post-Market Monitoring | 12% | 1 | 1 | — | 2 | 1 | Sources on the vendor's own domain |
| Customer Documentation | 8% | 2 | 1 | Sources on the vendor's own domain | 3 | 0 | Sources on the vendor's own domain |
| All criteria | 100% | 10 | 8 | Sources on the vendor's own domain | 15 | 4 | Audit reportSources on the vendor's own domain |
Mercor has 16 evidence rows across 7 of 7 criteria — 10 with a source URL, 8 documented absences; Plum has 19 evidence rows across 7 of 7 criteria — 15 with a source URL, 4 documented absences.
Provenance
The scores above are documented by 35 evidence rows on file for these two vendors: 16 for Mercor, across 4 distinct source domains, and 19 for Plum, across 1 distinct source domain.
- Rubric
- v1.0
- Mercor last reviewed
- June 7, 2026 · HireAIScore editorial team
- Plum 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