We believe one good lawyer can make a difference.

I’m Arthur Rothrock, and I still litigate. There’s a case on my docket right now that won’t die, and I work it the same weeks I work on Legion.

Real cases drive the roadmap. The features I want for my own practice are the features you want for yours. Practicing while I build is how we keep getting the priorities right and the product moving forward every week.

That means you get a platform that understands California litigation practice like no other platform available. The document you get back is on nicely formatted pleading paper. You don’t have to explain that requests for admission and special interrogatories can’t be compound (most of the time). When you have a lot of them, we know you need a counsel declaration for additional discovery, and Legion drafts that automatically too. If your brief is over ten pages, we know it needs a TOC and TOA, and Legion builds both for you.

I was an early adopter of AI. It is a hugely powerful tool. But I was frustrated with the limitations of the chatbot interface, and even more frustrated with how poorly implemented AI has been from the major players. I tell my team that any time I leave Legion to use some other AI, that is a failure of our product. We are here to deliver a platform that will make you never want to practice law the old-fashioned way again.

We have shipped support for fourteen production workflows for California litigators since March 2025. A new release roughly every four weeks.

Pleadings, motions, discovery, supporting declarations, exhibit-packaged filing PDFs. And now Centurion, an AI legal analyst that sits next to your draft and runs strategic review across complaints, answers, and discovery.

The frontier of AI moves every few months, and we move with it. We are constantly evaluating the newest models from OpenAI, Anthropic, and everyone else so you don’t have to. The moment a better model is available for the job, we route to it. You never have to wonder whether your vendor is running you on last year’s tech.

Slow shipping is a tax on your practice. The longer a vendor sits on an old model, the longer you lose to opposing counsel who picked a vendor that didn’t. Picking Legion is picking the team that ships every month, on a cadence your competitors can’t match.

No AI platform should be promising output entirely free of hallucination. The technology isn’t there yet. What matters is keeping the major hallucinations – fabricated cases, made-up holdings, imagined facts – in check.

Four things keep them in check on Legion. We route every workflow to whichever frontier model is strongest for that task, so the best brain available is on your draft. We constrain the model against fabricating cases and imagining facts at the prompt and validation layers. We practice ruthless context window management – the model only sees what it needs for the task at hand, never noise from elsewhere in the file. And our case-law sourcing is built per workflow – never left to the model’s training data.

For specialized tools like our discovery separate statement builder, Legion draws on a proprietary database of California case law curated for that workflow. For more general tools like our memorandum of points and authorities builder, we recommend you do your own research and feed Legion the three to five cases you want it to rely on.

This is good, but it’s not good enough. We’re working on Sentinel – our fact and citation verification system – and continuing to build out Centurion to assist with your legal research right in the app at the time of drafting. The goal: a quick once-over instead of hours of review, and a draft you can trust when you’re in a jam. We’ll tell you when each one lands.