The #1 practice and financial management system for law firms
Aderant Expert Sierra is a cloud practice and financial management system for law firms that brings conflicts checks and file opening, client, matter and case management, time and expenses, billing and rates, accounting and trust, and reporting into one integrated system, with AI from Aderant's MADDI. It is best for mid-size and large law firms, and Aderant says it is used by 58% of the Am Law 200 and 50% of the NLJ 500.
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Aderant Expert Sierra
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Expert Sierra covers conflicts check and file opening; client, matter and case management; WIP, time and expense management; billing, rates and collections; accounts payable and receivable, tax, disbursements, general ledger and trust management; and financial insights, reporting and analytics. Lawyers enter time on any device within client guidelines, pre-billing is paperless, alternative fee arrangements are supported, and bills connect to delivery, tracking and billing compliance tools. It is the cloud version of Aderant Expert, hosted on AWS with SOC 2 Type 2 compliance and extensive auditing. It is built on Aderant's Stridyn platform and includes next-generation applications only available on Sierra: Aderant Accounts Receivable, Aderant General Ledger and Aderant Analytics, with natural language questions through askMADDI, MADDI AI automation and AI financial agents. Workflows can be built and deployed across the firm, and it integrates with CRM, document management and HR systems. Aderant says it has more than 640 Expert and Sierra clients, over 250 of them in the cloud, and that more than 230 firms replaced legacy systems with Expert in the last five years. Holland & Knight says it cut pre-bill time by more than 50%, and Kostelanetz LLP halved the time to process cash receipts. Other named clients include Fross Zelnick, Meridian Lawyers, Baker Botts, Chartwell Law and Phi Finney McDonald. Aderant also sells iTimekeep, Onyx, BillBlast and docketing tools. Pricing is through a demo.
What it does
Client, matter, case and financial data in one dashboard
Time entry on any device within client guidelines
Paperless pre-billing, AFAs and billing compliance
GL, AP, AR, tax, disbursements and trust
Natural language questions across Aderant data
Firm-wide workflows; CRM, DMS and HR integrations
Dashboards, inquiries and scheduled reports
Who it is for
Case studies
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Trust & compliance
Security certifications
Named enterprise customers
Pricing details
Starting price
Pricing model
Free version
Aderant does not publish prices; firms request a demo.
Product videos & screenshots
Product interface
Aderant Expert Sierra Interface
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Chris Cartrett has stepped down as President and Chief Executive Officer of Aderant, effective August 1, 2026, the legal technology company announced Monday.

Aderant launched its AI-powered Agent Center on May 12, 2026, at Momentum Global 2026 in Fort Lauderdale, Florida, to automate key financial and talent workflows at law firms. This release marks a shi
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FAQs
Aderant does not publish Expert Sierra prices. Firms request a demo, and pricing depends on the firm's size and the modules it uses, such as billing, financial management and the next-generation General Ledger, Accounts Receivable and Analytics applications.
Expert Sierra is the cloud version of Aderant Expert, hosted on AWS. Firms that self-host Expert do not get the Sierra-only applications: Aderant Accounts Receivable, General Ledger and Analytics, askMADDI natural language queries and AI financial agents.
Aderant says Expert and Sierra are used by more than 640 firms, including 58% of the Am Law 200 and 50% of the NLJ 500. Named clients include Holland & Knight, Baker Botts, Fross Zelnick, Kostelanetz LLP and Chartwell Law.
Yes. MADDI is Aderant's AI. askMADDI answers natural language questions across Aderant data, MADDI automates tasks, and AI financial agents run on the Stridyn platform.
Expert Sierra is hosted on AWS and has completed a SOC 2 Type 2 examination, with proactive monitoring and extensive auditing.
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