A

Arceus

AI-assisted, flat-fee commercial contract services

Overview

Arceus combines licensed attorneys with proprietary software and AI to provide flat-fee commercial contract services for fast-growing companies. Its CounselOS platform connects to client tools like Salesforce, HubSpot, Gmail, and Slack to feed AI agents with company context, then drafts are prepared by AI and reviewed and approved by a licensed attorney before delivery. The firm differentiates itself with upfront fixed pricing and guaranteed eight-hour turnaround, plus a managed legal-service approach that emphasizes transparency and efficiency over hourly billing. Its goal is to help startups and growth-stage companies cut legal spend while expanding into broader areas of law such as employment and privacy through ongoing hiring and expansion.

Launched RecentlyFunded Recently

Work here?Claim your company

About Arceus

Simplify's Rating
Why Arceus is rated
C+
Rated C on Competitive Edge
Rated B on Growth Potential
Rated C on Differentiation

Industries

ConsultingEnterprise SoftwareAI & Machine LearningLegal

Company Size

11-50

Company Stage

Series A

Total Funding

$17M

Headquarters

San Francisco, CA

Founded

2026

Get referred to Arceus

See people who can refer or advise you

Simplify Jobs

Simplify's take

What believers are saying

  • Arceus raised $17 million from Greycroft, Craft Ventures, and South Park Commons on October 1, 2026.
  • The company claims 12,000 contracts reviewed and a quadrupled customer base in September 2026.
  • Demand fits fast-growing SaaS and AI companies that hate slow, unpredictable Big Law processes.

What critics are saying

  • California SB 574 takes effect January 1, 2027 and restricts generative-AI legal delegation.
  • Outside ownership limits in law practice cap capital flexibility and threaten scaling.
  • Crosby, backed by $60 million, already sets the competitive bar for AI law firms.

What makes Arceus unique

  • Arceus launched October 1, 2026 as an AI-native law firm, not software.
  • CounselOS integrates Slack, Salesforce, HubSpot, and Gmail into attorney workflows.
  • Flat fees, eight-hour guarantees, and attorney signoff directly attack billable-hour incentives.

Help us improve and share your feedback! Did you find this helpful?

Funding

Total Funding

$17M

Above

Industry Average

Funded Over

1 Rounds

Notable Investors:
Series A funding typically happens when a startup has a product and some customers, and now needs funding to scale. This money is usually used to grow the team, expand marketing, and improve the product. Venture capital firms are frequently the main investors here.
Series A Funding Comparison
Above Average

Industry standards

$15M
$8.2M
$15M
$17M
$30M

Benefits

  • Health Insurance
  • Dental Insurance
  • Vision Insurance
  • Unlimited Paid Time Off
  • 401(k) Retirement Plan
  • Wellness Program
  • Company Equity

Company News

VIP Graphics
Oct 27th, 2026
Arceus pitch deck: $17M for AI-native law firm.

Arceus pitch deck: $17M for AI-native law firm. Founded by serial entrepreneur Mac Liu, Arceus is an AI-native law firm built for speed, cost, and transparency. The majority of businesses still depend on traditional law firms that move work through layers of bureaucracy and manual processes billed by the hour. The longer the work takes, the more the law firm earns. "As a founder, I always hated how helpless I felt working with law firms. I went through four or five different firms and somehow the experience was always the same. I'd be waiting on something important to our business with no idea when I'd hear back. I'd have to re-explain our business over and over again. And I dreaded jumping on calls because I knew every minute was costing me money," Mac said in an X post. Arceus gives businesses a faster and better experience with a flat upfront price and no surprise invoices. The platform reviews every contract in 3 - 5 hours and if it takes more than 8 hours, the review is free. Each contract is signed off by a licensed attorney. The biggest draw of Arceus is that clients don't have to sign into a separate platform; instead, they are provided a dedicated stack channel where they can upload the documents and ask questions. A virtual agent gathers context from systems, like Salesforce and HubSpot, and past agreements. It then suggests changes based con the context and routes the matter to one of the firm's attorneys for final review. "You're not pinging a lawyer because you just want to chat," Liu said. "You're nervous about something, you're questioning something, and you want to feel like someone's there." Arceus has garnered significant interest and, according to a company statement, already reviewed more than 12,000 contracts for some of the fastest growing companies in the world. In September, their customer base quadrupled. On Thursday, Arceus said it raised new funding from Greycroft, Craft Ventures, and South Park Commons, bringing its total funding to $17 million. "We will be the law firm that powers every business in the world. This funding helps us get there faster, as we grow our team of attorneys, engineers, and AI researchers and expand our services." said Liu. Check out the 18-slide pitch deck Arceus used to secure the $17 million Seed funding round. What were the slides in the Arceus pitch deck? Browse the exact example slides from the pitch deck that Arceus used to raise $17M from Greycroft. 1. Team slide. When investors evaluate an early-stage startup, they treat the founding team as one of the most important aspects of the business. This is where they look beyond all the technical jargon and financial models to vet the humans that are building the solution. They are particularly interested in understanding the founder's experience, their technical knowledge, and why they are uniquely qualified to solve this specific problem. The team slide explains that Liu ticks all the boxes; he brings serious technical chops as he has spent his entire career at the intersection of defense, applied AI and large-scale systems engineering. When it comes to startup experience, he's a serial entrepreneur and before founding Arceus, he started Vultron which he sold to a govtech firm, pWin. Prior to that, he built large-scale recommendation and retrieval systems at Robinhood and Google. One thing Lui lacks is expert knowledge related to the law field. To compensate for this, the slide introduces Chief Legal & Strategy Officer Eugenia Bergantz. One thing VIP don't like about her introduction is that it's all generic. It doesn't quantify how she has helped AI SaaS companies. On the design side, the slide is perfect. The heading contains a great hook, the photos are professional, and the bullet points are small and to the point. Overall, this is a great team slide that establishes strong founder-market fit and presents Lui as a capable founder investors would be happy to back. 2. Testimonial slide. Humans are social creatures and what the crowd says matters to VIP, especially when VIP is making purchases. Research shows that 93% of consumers read reviews before buying a product or service, and 84% trust online reviews as much as personal recommendations. Reviews, testimonials, and case studies give customers confidence that a business delivers on its promises. The same is true for investors. They might or might not believe what founders are saying about the products, but positive customer testimonials give them confidence that the product is resonating with the target audience. When presenting a customer testimonial in a pitch deck, it's recommended that the testimonial clearly shows how your product has improved their life. Ideally, it should paint a before-and-after picture explaining what the customer was doing before (e.g. what tools they were using, how many people were involved, and how many hours it took previously), and contrast that to tangible improvements when using your product or service. Although Arceus customer experience slide doesn't follow this exact template, it uses a testimonial that presents a very clear picture of the problem the product solved and the results it gave this customer. Unlike a feel-good vague review that could fit any situation, this one is vivid and emotional. 3. Ask slide. Before investing in any startup, investors want to understand what the business will use the money for. This knowledge gives investors insight into what the startup's strategy and plan for the future is. For example, if the startup is raising funds only for founder salaries, it's a huge red flag that the founders are not willing to take the same risk as investors. On the other hand, it makes much more sense if they are raising to enter a new market, to scale the sales process, or to grow production. The ask also shows investors that the founders understand where they want to go and they have a plan to get there. Without a plan, it is easy to go off on a tangent, get distracted, and use the funds without getting any results. To increase your chance of securing funding, it's a good idea to showcase previous raised funds, the goals that were set for the previous rounds, and the progress on those goals. However, for a company like Arceus that is raising for the first time, this ask slide is a solid alternative: it clearly explains what the founders want to achieve (scale into new areas of legal services) and how they are planning to achieve that (hire new attorneys, engineers, and AI researchers). The slide's design is simple and effective with a clear visual hierarchy. The two-column layout is well-balanced and creates a logical flow. Additionally, generous whitespace makes the slide feel uncluttered. Overall, the ask slide delivers the message without any visual friction. How to create your own pitch deck like Arceus: VIP hope you learned something from the Arceus pitch deck, and that you are able to use these insights for your own business. If you'd like to, you can bookmark it at bestpitchdeck.com/Arceus. Although it probably goes without saying that having a successful business (outside just their pitch deck) was integral to their success, the perfect pitch deck is critical for any startup to ensure your vision is portrayed properly. That's where crafting the perfect pitch deck comes essential: Its team has helped create decks that have closed over $2B+ in deals & funding for leading startups and even VC firms. You can leverage this experience and get a jumpstart on your pitch with one of its easy-to-use presentation templates, one-pagers, or financial models. Every pitch requires a unique approach tailored to its audience. Its team of experts has created pitch decks for different industries, as well as funding stages: You might be interested in the popular AI Startup Pitch Deck Template designed by its team of experts at VIP.graphics. This investor presentation template is built specifically for artificial intelligence and machine learning companies. Accelerator Pitch Deck Template - The Accelerator Pitch Deck template was crafted for early-stage founders seeking to win funding &/or investment from pitch contests, accelerators, incubators, and angels or VC firms. Winning a pitch contest or being accepted to a prominent accelerator program requires a unique strategic approach to an investor pitch presentation. Series A Pitch Deck Template - A pitch deck template for startups and founders raising funding: Smart, actionable slides that work. This is a pitch deck template built specifically for startups, entrepreneurs and founders raising their first seed or Series A round of institutional capital. Mergers & Acquisitions Pitch Deck Template - Perfect Pitch Deck(TM) is a template crafted for later-stage businesses entering more sophisticated discussions such as mergers & acquisitions (M&A), late-stage investment (Series C+), or other partnerships & financing opportunities. Its team of experts created this presentation to empower founders to present with confidence to investment banks, private equity (PE) groups, and/or hedge funds (and vice versa). * Next PostMultiply Labs pitch deck: $75M for robotic pharmaceutical manufacturing. Company. Products. Links. Less than 2 emails per month - only the good stuff. VIP hate spam too.

HyperAI
Oct 1st, 2026
AI-Native Law firm Arceus raises $17M to challenge Big Law.

AI-Native Law firm Arceus raises $17M to challenge Big Law. On Thursday, AI-native legal services provider Arceus announced a $17 million Series A funding round led by Greycroft, with participation from Craft Ventures and South Park Commons. The capital injection accelerates the firm strategy to compete with established Big Law practices, corporate in-house legal departments, and traditional legal technology vendors by merging human attorney expertise with automated contract review workflows. Founder Mac Liu, a two-time tech entrepreneur previously employed at Robinhood and Anduril, is deploying capital recently acquired from the sale of his defense software company, Vultron, to pWin. Liu approach deliberately diverges from the traditional legal industry structure. Rather than positioning Arceus as a conventional firm supplemented by software, he has engineered it as a technology-first operation. Engineers were onboarded ahead of legal counsel, and the company enforces a six-day work week with a strict service-level target of acknowledging customer requests within five minutes. The platform operational architecture integrates directly into existing corporate communication and data ecosystems. Employees submit contracts through Slack, where an AI-driven virtual agent automatically ingests contextual data from integrated platforms like Salesforce and HubSpot, alongside historical agreement databases. The system proposes revisions before routing the matter to a qualified attorney for final oversight. To underscore efficiency, Arceus has implemented a performance guarantee: standard agreement reviews costing more than eight hours are provided at no charge. This asset-light, outcome-driven model mirrors the trajectory of Crosby, an AI-native firm recently valued at $400 million, which similarly prioritizes internal software development for its own practitioners. Liu contends that corporate legal teams are increasingly fatigued by fragmented SaaS solutions and prefer integrated delivery models that accelerate contract turnaround without requiring platform migration. By embedding directly into familiar workflows, Arceus aims to reduce reliance on external legal vendors and potentially decrease the headcount requirements for internal legal departments. Investors appear confident in Liu tech-centric thesis, citing growing corporate demand for predictable legal service delivery and measurable efficiency gains. While the broader legal sector continues to evaluate artificial intelligence integration, Arceus is positioning itself as a structural alternative rather than a supplemental tool. The new capital will be allocated to scaling engineering capabilities, expanding attorney hiring, and deepening integrations with enterprise CRM and contract lifecycle management systems. This news is intelligently aggregated by AI to deliver industry updates efficiently. It does not constitute opinions or advice.

Artificial Lawyer
Oct 1st, 2026
New model law firm Arceus raises $17m.

New model law firm Arceus raises $17m. It's raining new model law firms! And here is Arceus, which launched this year and has just announced a $17 million fundraise led by Greycroft. And yep, it's an MSO. And yep, it 'combines licensed attorneys with AI agents and proprietary software to deliver fast legal services'. And also yep, it focuses on 'commercial legal work, reviewing, drafting and negotiating contracts at a flat price', often for startups and scale-ups. Plus, it says that 'standard reviews are guaranteed within eight hours or the review is free' - which is nice. And also, as with many others now, they've built some of their own software. In this case it's a proprietary operating system, CounselOS. They said that this gives 'Arceus attorneys context on a company's business, preferences, agreements, prior decisions and negotiation history. It connects to the platforms where companies already work, including HubSpot, Salesforce, Gmail and Slack, to gather context, identify issues and route each matter to the right attorney'. Arceus's San Francisco-based Founder and CEO, Mac Liu, commented: 'I went through multiple law firms and kept running into the same problems with missed deadlines, constant back-and-forth and bills that came in higher than expected. Legal became one of the most frustrating parts of the business.' - Advertisement - 'The billable-hour model just didn't make sense to me because firms are incentivized to take longer,' he added. 'We started Arceus because we believe every business deserves a better law firm that always puts the client first and sets a new standard for speed, responsiveness, transparency and service.' And Mark Terbeek, Partner at Greycroft, concluded: 'Most of the legal AI market is focused on selling better software to existing law firms. We believe Arceus is taking on a much bigger opportunity by rebuilding the law firm itself. Its flat-fee model and focus on significantly faster turnaround times are designed to meet the needs of fast-moving companies.' Is this is a big deal? Well, new model law firms are appearing so frequently now they're almost out-doing the legal AI companies in terms of their cadence - and that's quite something. In this case, what would have seemed like a very unusual format is today almost the 'state of the art' for NewMods, e.g. MSO, speed of work, flat fees, they carry the risk, AI and good lawyers and more. It's hard to believe that in the space of about nine months, this format has become 'normal' for an ever-growing number of law firms in the US, UK and now Europe. And it should be underlined: they are law firms - just with a novel structure and a focus on making AI do as much as it can. What makes Arceus stand out from some peers is that they've raised $17m so early. Other NewMods have also raised, but not that many have raised this much at the start. Congratulations and AL looks forward to seeing this new model's growth amid its many peers. Legal Innovators UK - Nov 4 and 5 / Legal Innovators New York - Nov 17 and 18 Cosmonauts have now opened Express Registration for Legal Innovators UK and New York. This means that if you are at a law firm or at an inhouse legal team you can now zoom directly to your tickets - which are complimentary as long as you qualify. For London - Nov 4 and 5, at the Minster Building, see here: And, for New York - Nov 17 and 18 - Midtown, please see here:

Business Insider
Oct 1st, 2026
A serial entrepreneur raised $17 million to build a Big Law alternative. Read the pitch deck.

Arceus combines a law firm with software. The bet is that in-house legal teams don't want another tool to manage; they want the work done faster.

Recently Posted Jobs

Sign up to get curated job recommendations

Arceus is Hiring for 10 Jobs on Simplify!

Find jobs on Simplify and start your career today

Don't see your dream role? Check out thousands of other roles on Simplify.Browse all jobs