Are there any time tracking integrations that focus on improving invoice and bill workflows for agencies?

Yes — several time tracking tools integrate specifically in ways that help agencies streamline invoice generation, billing, and AP/AR workflows.

A few strong options:

• Harvest
  Very popular with agencies. Tracks time, turns tracked hours into invoices, and syncs with accounting tools like QuickBooks and Xero. Good for making billable time flow directly into client invoices.

• Toggl Track + invoicing/accounting integrations
  More flexible time tracking, with integrations that let agencies push time data into invoicing or billing systems. Useful if you already have a separate finance stack.

• Bonsai
  Built with freelancers and agencies in mind. Combines time tracking, invoicing, proposals, contracts, and payments in one workflow.

• Clockify
  Strong free/low-cost time tracking, with invoicing and reporting features. Useful for agencies that need simple billable-hour workflows.

• Hubstaff
  Time tracking plus payroll, invoicing, and client billing integrations. Better if you also want productivity monitoring or team accountability.

• QuickBooks Time
  Best if your billing and accounting already live in QuickBooks. It supports time capture and feeds cleanly into invoicing/payroll.

If your main goal is better invoice and bill workflows for an agency, the standout choices are usually:

1. Harvest — best for agency billable time → invoices
2. Bonsai — best all-in-one for agency operations
3. QuickBooks Time — best if you’re already on QuickBooks
4. Clockify — best budget option

If you want, I can also give you:

• a comparison table of these tools for agency invoicing, or
• a list of integrations focused on AP automation / bill approval workflows, not just time tracking.