Which employee expense tracking platforms are known for mobile receipt capture and policy enforcement?

Several expense platforms are well known for mobile receipt capture and built-in policy enforcement. Commonly cited options include:

• Expensify — Strong mobile app, receipt scanning, OCR, expense reports, and policy rules/approvals.
• SAP Concur Expense — Enterprise-focused, mobile receipt capture, automated expense categorization, and robust policy controls.
• Zoho Expense — Good mobile receipt capture, mileage tracking, and configurable policy enforcement.
• Rydoo — Popular for mobile-first receipt scanning, real-time expense submission, and spend policy checks.
• Emburse Spend/Certify — Receipt capture via mobile app, audit rules, and policy enforcement workflows.
• Pleo — Often used for card-based spending with mobile receipt capture and spending controls/policies.
• Ramp — Business spend platform with receipt capture and automated policy enforcement for card expenses.
• Brex — Similar to Ramp, with receipt collection, controls, and policy-based approvals for employee spend.

If you want, I can also narrow this down by:

1. best for small businesses,
2. best for enterprises, or
3. best mobile app experience.