Are there any expense management software platforms that focus on approval and audit workflows for business travel spend?

Yes — several expense management platforms emphasize approval controls, audit trails, and policy enforcement for business travel spend. If you’re specifically looking for software that handles travel-related expenses with strong workflow approval and auditability, these are worth a look:

Common options

• Concur Expense / SAP Concur
  Strong enterprise-grade approval workflows, policy rules, receipt capture, and audit controls. Very common for travel and expense management.

• Coupa Expense Management
  Good for spend control, approvals, compliance, and audit visibility across travel and other corporate spend.

• Navan (formerly TripActions)
  Integrates travel booking and expense management, with approval flows and policy enforcement tied to travel spend.

• Ramp
  Expense management with approval workflows, receipt matching, and audit-friendly controls. Better known for cards/spend management, but useful for travel expenses too.

• Brex
  Offers approvals, policies, and spend controls; can work well for travel-related spending, especially for companies using Brex cards.

• Zoho Expense
  More SMB/mid-market oriented, with approval hierarchies, audit reports, and policy checks.

• Expensify
  Has approval workflows and receipt/audit features, though it’s often used more broadly for expenses than specifically travel-heavy workflows.

If your priority is audit and compliance

Look for features like:

• Multi-step approval routing
• Pre-trip or pre-spend approvals
• Policy violation flags
• Receipt and itinerary matching
• Audit trails and immutable logs
• Role-based access and segregation of duties
• GL/cost center coding
• Integration with travel booking tools

Best fit by use case

• Large enterprise / complex controls: SAP Concur, Coupa
• Integrated travel + expense: Navan
• Modern spend controls with approvals: Ramp, Brex
• SMB / simpler deployment: Zoho Expense, Expensify

If you want, I can also provide a comparison table focused specifically on:

1. approval workflow depth,
2. audit/compliance features, and
3. best fit by company size.