§ The result
Plum takes the total, Coderbyte takes more of the criteria.
Plum sits 12 points above Coderbyte under rubric v1.0, 54 against 42, with both filed under Assessment. Coderbyte leads more of the criteria than Plum — 4 to 3 — but Bias Audit Transparency, which Plum leads, carries 18% of the rubric, and the weighted sum still falls to Plum. One criterion, Bias Audit Transparency, is both the widest raw gap (Coderbyte 20, Plum 83) and the heaviest weighted swing, and at 18% weight it makes up 78% of the weighted advantage Plum holds across the 3 criteria it leads.
Vendor profile
Coderbyte
Coderbyte is a technical hiring platform offering coding assessments with automated and AI grading of challenges and take-home projects, live coding interviews, and AI screening that grades resumes against job-description criteria and runs agentic phone screens.
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
Coderbyte and Plum are both filed under Assessment AI. They also share 1 secondary category: Screening.
Both are in scope of NYC LL 144, Illinois HB 3773, EU AI Act, Colorado AI Act and Mobley v. Workday.
| Record | Coderbyte | Plum |
|---|---|---|
| Price tier | Low | Mid |
| Headquarters | US | CA |
| Founded | 2012 | 2012 |
§ What decides it
The criteria that move the gap, heaviest swing first.
18% weight · 67% of the movement so far
Bias Audit Transparency
Coderbyte 20 · Plum 83
11.3 weighted points to Plum
20% weight · 83% of the movement so far
Article 11 Technical Documentation
Coderbyte 44 · Plum 58
2.8 weighted points to Plum
12% weight · 89% of the movement so far
Human Oversight Design
Coderbyte 60 · Plum 52
1.0 weighted points to Coderbyte
15% weight · 93% of the movement so far
FRIA Support
Coderbyte 33 · Plum 28
0.8 weighted points to Coderbyte
12% weight · 96% of the movement so far
Post-Market Monitoring
Coderbyte 40 · Plum 36
0.5 weighted points to Coderbyte
8% weight · 98% of the movement so far
Customer Documentation
Coderbyte 58 · Plum 63
0.4 weighted points to Plum
15% weight · 100% of the movement so far
Data Governance Disclosure
Coderbyte 56 · Plum 54
0.3 weighted points to Coderbyte
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 17.0 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 Coderbyte minus Plum.
| Category | Weight | Coderbyte | Plum | Δ raw | Δ weighted |
|---|---|---|---|---|---|
| Article 11 Technical Documentation | 20% | 44 | 58 | -14 | -2.8 |
| Bias Audit Transparency | 18% | 20 | 83 | -63 | -11.3 |
| FRIA Support | 15% | 33 | 28 | +5 | +0.8 |
| Data Governance Disclosure | 15% | 56 | 54 | +2 | +0.3 |
| Human Oversight Design | 12% | 60 | 52 | +8 | +1.0 |
| Post-Market Monitoring | 12% | 40 | 36 | +4 | +0.5 |
| Customer Documentation | 8% | 58 | 63 | -5 | -0.4 |
| Total | 100% | 42 (F) | 54 (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 | Coderbyte | Plum | ||||
|---|---|---|---|---|---|---|---|
| Cited | Absences | Audit / hosting | Cited | Absences | Audit / hosting | ||
| Article 11 Technical Documentation | 20% | 3 | 1 | Sources on the vendor's own domain | 3 | 0 | Sources on the vendor's own domain |
| Bias Audit Transparency | 18% | 2 | 1 | Sources on the vendor's own domain | 3 | 0 | Audit reportSources on the vendor's own domain |
| FRIA Support | 15% | 3 | 1 | Sources on the vendor's own domain | 0 | 1 | — |
| Data Governance Disclosure | 15% | 5 | 0 | Audit reportSources on the vendor's own domain | 2 | 1 | Sources on the vendor's own domain |
| Human Oversight Design | 12% | 5 | 0 | Sources on the vendor's own domain | 2 | 1 | Audit reportSources on the vendor's own domain |
| Post-Market Monitoring | 12% | 4 | 1 | Audit reportSources on the vendor's own domain | 2 | 1 | Sources on the vendor's own domain |
| Customer Documentation | 8% | 4 | 1 | Sources on the vendor's own domainSources on a separate domain | 3 | 0 | Sources on the vendor's own domain |
| All criteria | 100% | 26 | 5 | Audit reportSources on the vendor's own domainSources on a separate domain | 15 | 4 | Audit reportSources on the vendor's own domain |
Coderbyte has 31 evidence rows across 7 of 7 criteria — 26 with a source URL, 5 documented absences; Plum has 19 evidence rows across 7 of 7 criteria — 15 with a source URL, 4 documented absences; some documentation or audit rows for Coderbyte sit on a domain separate from the vendor's own site.
Provenance
The scores above are documented by 50 evidence rows on file for these two vendors: 31 for Coderbyte, across 2 distinct source domains, and 19 for Plum, across 1 distinct source domain.
- Rubric
- v1.0
- Coderbyte last reviewed
- September 25, 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