---
title: William Reviews
meta_title: 'William Reviews 2026: Details, Pricing, & Features | G2'
meta_description: Filter reviews by the users' company size, role or industry to find
  out how William works for a business like yours.
date_modified: '2026-03-10'
parent_category:
  name: Insurance
  url: https://www.g2.com/categories/insurance
---

# William Reviews
**Vendor:** Certifi  
**Category:** [Insurance Billing Software](https://www.g2.com/categories/insurance-billing)
## About William
William™ by Certifi is purpose-built premium billing and payment software for health plans and health insurers. Unlike billing modules bundled into core admin platforms, William™ is designed from the ground up to handle the complexity of health plan billing — including ACA marketplace, Medicare Advantage, Medicaid, and commercial lines of business. Built on the Perfect Balance™ accounting architecture, William™ enforces balanced debits and credits at every transaction, virtually eliminating the manual reconciliation work that plagues teams using legacy or core admin billing systems. Key capabilities include: Automated invoice generation, retroactive adjustments, and payment matching Integrated member payment portal (ACH, credit/debit card, retail cash) Configurable delinquency management with automated letter generation Real-time billing data via API for member portals and service teams No-code billing rule configuration — no developer required Integration with upstream enrollment platforms and downstream GL systems via API, flat file, or SSO William™ is PCI, NACHA, SOC2, and HIPAA compliant and is designed to scale to millions of transactions per month.






- [View William pricing details and edition comparison](https://www.g2.com/products/william/reviews?section=pricing&secure%5Bexpires_at%5D=2026-07-02+15%3A13%3A43+-0500&secure%5Bsession_id%5D=41edcbb2-1666-4a8f-8873-f37f3426ea1a&secure%5Btoken%5D=9e983a5a77f1ea00ffb780404d1d49b714e1a7b52049af241a31aaaf9cbdb01c&format=llm_user)


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