Pricing
The software has no license cost and no per-seat pricing. You choose the AI model and pay only the API costs you use. A cloud-hosted version is offered with free signup; hosted plan details are not stated.
Learn moreMikeOSS
Open-source legal AI platform that law firms can self-host and extend
Intermediate
What is MikeOSS?
MikeOSS is a legal tool. MikeOSS (Mike) is an open-source legal AI platform for document review, contract drafting, case law research and reusable workflows. Law firms can self-host it or use the cloud version, paying only for model API usage.
MikeOSS, branded simply as Mike, is an open-source legal AI platform positioned as a free alternative to commercial products such as Harvey and Legora. It is aimed at law firms and legal teams that want to run, inspect and modify their own AI tooling instead of renting a closed system. The code is public on GitHub, and a cloud-hosted version is also available for teams that prefer not to deploy anything. The core of the product is an assistant: a chat interface that reads uploaded documents, gives citations tied to the source, researches case law, runs multi-step workflows and drafts or edits contracts. Work is organised into projects, which act as matter-scoped workspaces. A team can load credit agreements, share purchase agreements, leases or diligence packs into one project, and the assistant keeps context across every conversation and document in it. Two other features shape daily use. Tabular review extracts structured answers across large sets of documents in a spreadsheet layout, with each cell cited back to a page and a quote. Workflows let firms save proven prompts, such as conditions precedent checklists, credit agreement summaries or change-of-control reviews, and share them as firm-wide templates that junior staff can run in one click. Release notes on the site mention CourtListener research, document version control, MFA, MCP connectors, OpenAI model support and a document library. The commercial argument is cost and control. There is no license fee and no per-seat pricing; firms choose their model and pay only for the API usage they generate. Self-hosting keeps documents inside the firm's own perimeter, which matters for privilege, residency and compliance. Because the prompts, citation parsing and data flows are open, the code can be audited, forked, wired to a document management system or paired with a different citation engine. Compared with proprietary legal AI suites, the trade-off is that a firm takes on more of the deployment and maintenance work, though the hosted option softens that.
How do you use MikeOSS?
1Create a cloud account
Sign up for the hosted version to try Mike without deploying anything. Teams wanting full control can instead clone the GitHub repository and self-host.
2Set up a project
Create a matter-scoped project and upload the relevant agreements or diligence documents. The assistant keeps context across all documents and chats in it.3Ask the assistant about your documents
Use chat to summarise, question or redraft a contract, and check the citations it gives back to the source text.4Run a tabular review
Apply a review across many documents to extract fields such as confidentiality definitions into a spreadsheet, with each cell cited.5Save a workflow
Turn a prompt that works, such as a CP checklist, into a reusable workflow so others at the firm can run it in one click.
Pros and cons
Pros
- No license fee or per-seat pricing; only the model API costs a firm incurs are paidAI
- Self-hostable, so documents can stay inside the firm's own perimeter for privilege and complianceAI
- Open code and prompts allow full auditing, forking and custom integrations such as a DMSAI
- Tabular review cites every extracted cell to a page and quote across many documents at onceAI
- Reusable workflows let firms standardise tasks like CP checklists and NDA reviews for juniorsAI
Cons
- Self-hosting puts deployment, security and upkeep on the firm's own IT teamAI
- Model API costs are separate and variable, so total spend is harder to predict than a flat feeAI
- Versioned releases are still early (v0.4.0 as of mid 2026), so maturity may trail established vendorsAI
- An independent review mentioned limitations lawyers saw, so fit varies by practice areaAI
How much does MikeOSS cost?
Integrations
Release notes mention CourtListener for case law research, MCP connectors, and OpenAI model support. The homepage also says firms can integrate their own DMS and citation engine by extending the code.
Learn moreFeatures
AI assistant with grounded citations, case law research and contract drafting; matter-scoped projects; tabular review across hundreds of documents with cited cells; reusable and firm-wide workflows; self-hosting; open, auditable code.
Frequently asked questions about MikeOSS
How much does MikeOSS cost?
The software has no license cost and no per-seat pricing. You choose the AI model and pay only the API costs you use. A cloud-hosted version is offered with free signup; hosted plan details are not stated.How do you use MikeOSS?
The walkthrough on this page covers 5 steps: 1. Create a cloud account 2. Set up a project 3. Ask the assistant about your documents 4. Run a tabular review 5. Save a workflow.What platforms does MikeOSS support?
MikeOSS is available on Web App.What does MikeOSS integrate with?
Release notes mention CourtListener for case law research, MCP connectors, and OpenAI model support. The homepage also says firms can integrate their own DMS and citation engine by extending the code.What are the limitations of MikeOSS?
Self-hosting puts deployment, security and upkeep on the firm's own IT team. Model API costs are separate and variable, so total spend is harder to predict than a flat fee. Versioned releases are still early (v0.4.0 as of mid 2026), so maturity may trail established vendors.
