I think Harvest is the one I've seen used most by consultants, though it only has a narrow lead over others. Freshbooks integrates with Expensify via API shari

I think Harvest is the one I've seen used most by consultants, though it only has a narrow lead over others. Freshbooks integrates with Expensify via API sharing, though the last time I looked at it, this solution was more expensive than Harvest.