Aderant

What it is

Aderant is the financial and business-operations system of record for large law firms: time entry, billing, rates, collections, general ledger, trust and firm analytics, plus docketing and talent products around that core. Its flagship is Expert, sold on-premises or as Expert Sierra, the AWS-hosted cloud edition. Roper Technologies has owned it since 2015. The vendor claims 2,500+ clients in 26 countries and more than 640 Expert and Sierra clients, 250+ of them already in the cloud, covering 58% of the Am Law 200. Treat those as vendor figures, but nobody disputes that Aderant and Elite 3E are the two platforms large-firm finance teams choose between.

Where Intapp governs whether the firm may take a matter and who can see it, Aderant runs what happens after the work is done: the time becomes an invoice, the invoice clears the client’s e-billing portal, and the cash lands. Aderant calls that “work to cash.”

Why it shows up in Legal Ops stacks

• It owns the billing data every AI agent needs. Stridyn is Aderant’s shared cloud platform and MADDI is its AI layer. Agent Center, announced at Momentum Global in May 2026 with three agents, moved into an open Early Access Program at ILTACON in late August 2026 with seven: Appeals, Collections, Talent, Time, Compliance, GL Forecasting and Rates. Each one reads licensed Aderant product data rather than a generic model’s guess about your firm.
• Outside counsel guideline compliance happens at the time entry, before the bill goes out. iTimekeep (100,000+ monthly active users, per Aderant), the Onyx OCG product and the new Compliance Agent check entries against client billing rules before they turn into e-billing rejections. For firms whose clients run strict outside counsel management programs, this is where write-downs are won or lost.
• The Harvey link is live, not a slide. Aderant and Harvey announced a partnership on December 15, 2025. The iTimekeep integration reached general availability on August 17, 2026: work done in Harvey becomes a draft time entry with matter context, duration and an AI-written narrative.

Pricing reality

Nothing is published, and every deal is quoted. Third-party buyer estimates, unsourced and to be read as approximate, put a smaller firm’s first year of Expert at roughly $25,000 to $100,000+ including implementation, larger firms well past $500,000, and on-premises maintenance at 15-22% of license. Aderant’s own blog names the objection finance teams raise most often: Sierra costs two to three times what the firm pays for its current Expert license. Aderant’s answer is that the license-only comparison ignores hardware refreshes, hosting, security tooling and IT time. It has a point, but you have to prove that with your own numbers.

Agent Center is in early access, with no public price and no general-availability date. Budget the Sierra move on finance modules alone.

Best for

CFOs, finance directors and legal operations leaders at firms of roughly 150 to 1,000+ lawyers that already run Expert and are deciding whether to move to Sierra. It is also the right choice when e-billing appeals and collections are where realization leaks. That makes the Appeals and Collections agents the first measurable test of the AI layer.

Do not buy it for a 30-lawyer firm. Below about 100 lawyers the implementation weight and the quote-only pricing buy more system than the firm will use, and Clio covers time, billing and trust at a published per-seat price. Do not buy it for a corporate legal department either. Aderant bills clients; it does not manage outside-counsel spend. That job belongs to Brightflag or Onit.

Versus the alternatives

Elite 3E is the other half of the large-firm duopoly. Francisco Partners announced it would buy Elite from TPG and Thomson Reuters in August 2025. Elite reports 123 firms live on 3E Cloud and 53,000 SaaS users, up 60% year over year, and says its cloud customers will outnumber on-premises customers by the end of 2026. Pick Elite when the firm is replacing a non-Aderant system and wants the platform with the most large-firm cloud references. Pick Aderant when you already run Expert, because Sierra keeps your database, customizations and integrations rather than forcing a re-implementation.

Intapp is not a substitute. It competes for the same “firm AI” budget. Its Celeste agents cover intake, conflicts and lateral hiring, and at ILTACON 2026 it announced a Legora partnership plus an Oddr integration that reaches into invoice-to-cash. By the two vendors’ own client claims, most Am Law 100 firms run both. Pick Aderant for finance and billing agents, Intapp for risk and intake agents, and don’t pay twice for collections.

Clio is the fastest-growing entrant moving up-market. It passed $500 million ARR in May 2026 and sells Clio Operate, built on its 2025 ShareDo acquisition, to large firms. Pick Clio when the firm is under about 150 lawyers or values published pricing over depth in rates and OCG compliance. It does not yet match Aderant’s rate governance or e-billing appeal handling at Am Law scale.

If none fit, the gap is usually collections, not the ledger. A point tool like Oddr on top of your existing system is cheaper than a platform migration.

Watch-outs

• Seven agents, no named firm references, no GA date. Everything about how Agent Center performs on your data is still vendor claim. Guard: join the Early Access Program with one agent, Appeals or Collections. Record the baseline (appeal recovery rate or 90-day+ AR) before go-live, and keep agents out of the Sierra business case until they are GA in your tenant.
• The Sierra quote will arrive at two to three times your license line. Guard: build your three-year on-premises total cost of ownership first — hardware amortization, hosting, security tooling, allocated IT hours. Then negotiate with that number and a written renewal uplift cap in the first order form.
• “Keep your customizations” also keeps your customization debt. Reviewers on G2 and Capterra report a steep first few months, slow patch-based fixes, and hourly fees for reporting help. Guard: inventory every customization before migration, retire the ones nobody uses, and put report-building support in the contract scope.
• No MCP server, and no public self-serve API documentation that we could find. Integrations such as Harvey run as vendor partnerships. Oddr shipped an MCP server at the same ILTACON. Guard: before signing, get written, contractual access to your own billing and AR data through a documented export or API, so your firm’s AI tools are not limited to the agents Aderant chooses to build.