Marble vs Blue J
Blue J vs Marble: which AI tax platform fits your firm?
Blue J and Marble both give citation-backed answers to US federal and state tax questions. Blue J is stronger for international tax and for Tax Notes and IBFD commentary. Marble is stronger for firm workflows: client intake, return analysis, firm knowledge and drafting guidelines, and an open MCP server for AI assistants.
The Verdict
Choose Blue J if: you do significant international or cross-border work; you want Tax Notes and IBFD commentary inside your answers; your team already works in Legora. Choose Marble if: you want research, client intake, return review, and drafting in one workspace; you want answers checked against your firm's own documents and drafts written to your firm's guidelines; you want to use Marble from Claude, Cursor, or another MCP client; you want a free plan or month-to-month billing.
What’s the difference between Marble and Blue J?
Both use AI to help tax professionals answer complex tax questions. The difference is what happens after you have the answer. Blue J is built to help you arrive at the right tax conclusion. Marble helps you complete the entire engagement. Instead of switching between your research platform, client document folders, and Word, Marble keeps everything connected: from client intake to document processing, research, and work products. If Blue J is your tax expert, Marble is your firm’s workflow assistant.
Key Takeaways About Marble
- Every Marble answer cites the underlying authority you can open in full.
- Your client data is never used to train public models.
- Free plan and month-to-month billing. Blue J's Individual plan is annual, and its Team plan is quote-based.
- Works inside Claude, Cursor, and any MCP client, with API keys for your own tools.
- Checks answers against your firm's documents and drafts to your firm's guidelines.
Side by Side
Marble vs Blue J
Blue J helps you find the answer. Marble helps you deliver the work.
| Capability | Blue J | |
|---|---|---|
| Ask tax questions in plain English | Yes | Yes |
| Citation-backed answers | Yes | Yes |
| Federal and all 50 states | Yes | Yes |
| International tax | No | Yes (IBFD, included) |
| Tax Notes commentary in answers | No | Yes (full articles need a Tax Notes subscription) |
| Organize work by client and engagement | Yes (Clients) | Yes (Projects) |
| Upload client documents into research | Yes | Yes |
| Client intake and tax document extraction | Yes | No |
| Draft memos, letters, and client emails | Yes | Yes |
| Return review | Yes (Return Analysis, findings linked to return pages) | Yes (Workflows for individual and partnership returns) |
| Check answers against firm documents | Yes (Firm Knowledge) | Not offered |
| Firm drafting guidelines | Yes | Not offered |
| MCP and API access | Open MCP server and API keys, any MCP client | MCP inside Legora only (early access) |
| SOC 2 Type II | Yes | Yes |
| Free plan | Yes | No (7-day trial) |
| Pricing | Pro $600/user/year, or $59/user/month | Individual $1,498/user/year; Team by quote |
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Marble vs. Blue J, answered
What practitioners say about Marble
Practitioners who switched from legacy research tools tell the same story: answers in seconds, not half an hour.
I used Marble during tax season and I think it is fantastic. It surpassed my expectations.
See it against your own work
Bring a question you already know the answer to and check Marble’s against it. That’s the fastest way to judge whether the citations hold up.