Zest AI

Zest AI is a United States software company founded in 2009 in Los Angeles as ZestFinance by former Google CIO Douglas Merrill and Shawn Budde, and now trading as Zest AI. It sells machine-learning credit underwriting technology to banks, credit unions and specialty lenders. Generic scorecards leave many thin-file and credit-invisible applicants unscored or declined, and manual review of those files is slow and inconsistent.

Each lender supplies its own historical loan performance data, which Zest AI combines with bureau and additional data sources to train an institution-specific risk model, then deploys it through APIs and loan origination system integrations such as MeridianLink. The product set covers AI-automated underwriting, fraud detection and lending intelligence, together with the LuLu Pulse and LuLu Strategy analytics tools, and every model ships with documentation and fair-lending monitoring for examiners. More than 600 active models run for its clients, mainly US credit unions, banks and auto and personal lenders. Zest AI was named to CNBC’s 2025 World’s Top FinTech Companies list.

1. Custom underwriting models: Risk models are trained on each lender's own loan performance history instead of one generic scorecard.

2. Automated decisioning: Credit union clients report auto-decision rates of 70-83% on consumer loan applications.

3. Fraud detection: A separate model set screens applications for identity and first-party fraud before underwriting.

4. Explainability and fair lending: Every model ships with documentation and disparate-impact monitoring for regulators.

5. LuLu analytics: LuLu Pulse and LuLu Strategy provide portfolio benchmarking and scenario testing for credit policy teams.

6. Production scale: More than 600 active models run across banks, credit unions and specialty lenders.