Counsel Stack
Counsel Stack, Inc. · HQ US · founded 2023 · Last checked 2026-09-16
Last checked = the date we last re-opened the vendor's published pages. Facts are what the vendor documents, not what it claims in marketing.
Citation-verification and legal-research API and web tool covering 10M+ opinions and 76M citations, detecting 40+ error types; deployable via API or as a containerised local install.
Provisional entry: fewer than four governance facts are sourced yet. It is excluded from search indexes until verified.
- Category
- Legal research · citation verification, citator API, hallucination detection, case-law research
- Built for
- Small firms & solos, Mid-sized firms, Large firms
- Model providers (disclosed)
- Not disclosed
- Data residency options
- United States
- Pricing
- usage · ~$0.0085 per citation check (vendor-stated average); free access tier
- Markets
- US
- Last checked
- 16 Sept 2026
What the vendor documents
Recorded from the vendor's own trust, privacy and terms pages. "Not disclosed" means we found no public statement, not that the control is absent.
What the public documentation states
Counsel Stack's terms describe the services as designed for attorneys and legal professionals, and the citator page says the product checks references against an index of more than 29,928,775 cites. The legal-data page says every pipeline ships with its own verification index, and the pricing page states access through API and local deployment, including a dedicated API endpoint or on-prem deployment. The privacy policy says the website is hosted in the United States, but product and service data handling is governed by separate agreements. The audit did not find named model providers, a public DPA or a sub-processor list. The pricing page publishes an average cost of $0.0085 per citation check; no free trial, minimum term or seat minimum was found. The record's accuracy evidence cites the Vals AI Legal Research benchmark from October 2025 as a third-party evaluation, and vendor pages state citation-checking and verification-index methods rather than a model benchmark.
In the vendor's words
“checking each reference against our index of 29,928,775+ cites”
“Every pipeline ships with its own verification index”
“Data handling for Counsel Stack products and services is governed by separate agreements”
“Dedicated API endpoint or on-prem deployment”
Not disclosed on public pages
"Not disclosed" records that no public statement was found where we looked, on the date shown. It does not assert that the control, term or figure is absent.
Not published on the pages we read on 2026-09-06: DPA, model providers, sub-processors, privacy or terms update date, free trial, minimum term, seat minimum, encryption-at-rest statement, ISO 27001, ISO 42001, no-training commitment, SOC 2, SSO/SAML and zero-retention terms. Legal procurement and DPIA reviews normally need these to assess client confidentiality, vendor access, GDPR Art. 28 processor duties, retention and supervision of research output.
Questions to put to the vendor
- Which model providers, if any, process citation text, research questions or uploaded documents?
- Can you provide the customer DPA, sub-processor list and breach-notification period for API and on-prem use?
- What retention, logging and deletion terms apply to citation checks and legal research queries?
- What SOC 2, ISO 27001 or ISO 42001 reports are available for Counsel Stack products?
- How are the verification indexes created, updated and tested for the jurisdictions a buyer will use?
Accuracy evidence
- third-partyVals AI Legal Research benchmark, Oct 2025 Highest legal-AI score: 78% weighted / 81% accuracy on 200 questions from six firms.
Related incidents
No incidents are recorded for this tool as of 2026-09-16.
Ownership · Bootstrapped; ~2 employees (Tracxn, Jan 2026).
Sources
Report an issue with this record →
Cite this record
SafeLegalAI Legal Tech Tools, "Counsel Stack", safelegalai.com/tools/counsel-stack (last checked 2026-09-16, accessed 2026-10-07). Data: CC BY 4.0.
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