Clio API
Clio provides a public REST API (v4) with OAuth 2.0 and an open developer portal at docs.developers.clio.com. Building is self-serve for third-party developers; listing in the 250 plus app marketplace requires an app review. One of the more open APIs in legal tech.
Frequently asked questions
Clio scores A on the API Report Card. Clio provides a public REST API (v4) with OAuth 2.0 and an open developer portal at docs.developers.clio.com. Building is self-serve for third-party developers; listing in the 250 plus app marketplace requires an app review. One of the more open APIs in legal tech.
Clio has a workable official integration path. Most engineering teams can build against it directly. Open API: self-serve, documented, with SDKs
Clio is the global leader in cloud-based legal practice management software, serving 400,000+ legal professionals across 130 countries.
Legal, Typically for solo practitioners through large law firms across all practice areas, with strongest penetration in small-to-mid-size firms (2-50 attorneys). Centralized hub for daily law firm operations: time tracking, billing/invoicing, matter management, client intake via Clio Grow, document storage, calendar/task management, client portal communications, trust accounting, and AI-assisted legal research via Clio Work.
Market leader with 12-16% share of the $32B legal tech market (practice management leader). 400,000+ users, approved by 100+ bar associations. Recently acquired vLex for US$1B and raised US$500M Series G. Revenue exceeds US$400M.
Yes, stores all case/matter records, client contacts, billing data, trust accounting, documents, time entries, court deadlines, and client communications. This is the core system of record for law firm operations.
~18 years old, founded 2008. Cloud-native from inception. Heavily modernized with AI features (Clio Work, Manage AI, Clio Draft) and US$1B vLex acquisition in 2025. Modern UI with 250+ integrations. 2,000 employees growing to 2,700.
No API-specific complaints found in research. Clio has one of the more open and well-documented APIs in legal tech. Failure to save document edits stored in the cloud; data loss issues. Full sourced list under Sources below.
Common alternatives include MyCase, Smokeball, Filevine, PracticePanther, Thomson Reuters (CoCounsel). Graded alternatives appear under "More from the report card" below.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.
Yes. Supergood maintains an unofficial Clio API and MCP server so AI agents and internal tools can read and write Clio data. See the Clio integration docs at supergood.ai/docs/clio-api-2.