PlaintiffStack vs Supio

What Supio does

Supio was founded in 2021 by former Microsoft engineers and sells AI to personal injury and mass tort plaintiff firms. It began with medical-record and document intelligence and, in May 2026, launched Supio Agent, which it calls an end-to-end agentic platform, along with Supio Intake, an AI intake agent that runs conversations at any hour and scores leads. Its listed uses include medical chronologies, demand letters, a case ledger for case economics, litigation drafting, firm intelligence, cross-case analysis and mass torts. Its site also marks Case Communications as new.

Supio raised a $60M Series B in April 2025, led by Sapphire Ventures with Mayfield and Thomson Reuters Ventures, for $91M in total. In its July 2026 update it reported 17x ARR growth since leaving stealth and a customer base that more than doubled in the first half of 2026.

Where Supio is strong

• It works with your system. Supio positions itself as no migration required: it reads from and writes back to your case management system. It added Litify and Smokeball integrations in 2026, and Litify's own AI demands, launched in June 2026, are delivered through a partnership with Supio.
• Research. Supio is connected to Westlaw Advantage through Thomson Reuters, which also invested in it.
• Mass torts. Cross-case analysis and firm-level views suit firms carrying large inventories.
• Security posture. Supio states SOC 2 Type II and HIPAA compliance and says it never trains foundation models on client data.

Where PlaintiffStack differs

PlaintiffStack is the case management system, not an add-on to one. Intake, contacts, matters, tasks, the calendar, documents, the client portal, the settlement statement and lien tracking live in the same place as the AI case tools. Agents propose facts, deadlines and tasks with the document, page and words they came from, and a person accepts each one. See Matters, Documents and Draft.

It is built for three practices on California rules: personal injury, workers' comp and employment. Workers' comp tools include a benefits audit, a QME cover letter and records index, and checks for IMR deadlines after a UR denial. Employment tools include a legal chronology and checks for civil filing deadlines after a right-to-sue notice. Supio doesn't market either practice.

Be clear about the trade-offs:

• No OCR yet. PlaintiffStack reads searchable PDFs, Word and text files, not scans or faxes. Records work is Supio's core.
• California only. Other states aren't supported.
• You switch systems. Choosing PlaintiffStack means moving off your current CMS. We move your cases, contacts and documents and check the result with you, but it is still a switch. See switching case management software.
• Young company. PlaintiffStack has no SOC 2 report yet (it's in progress) and no long customer list.

Pricing

Supio doesn't publish prices. PlaintiffStack is $250 per case, every app included, with no monthly fee or long lock-in contract. AI usage is billed separately: each tool shows an estimated cost before it runs, and how usage is billed is part of your quote. If you're comparing, add Supio's quote to what you pay for your current CMS, since Supio sits on top of it. Our case management cost calculator helps.

Who should pick which

Pick Supio if you like your case management system and want strong, research-connected AI on top of it, or if you run mass torts or practice outside California. Pick PlaintiffStack if you're a California firm ready to replace the system itself, especially with workers' comp or employment cases in the mix. For a three-way view, read EvenUp vs Supio vs Eve and our medical chronology software guide.