Harvest offers Free Trial, but Apollo does not.
Apollo is designed for Large Enterprises, Medium Business and Small Business.
Harvest is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Apollo Starts at $10/Month whereas for Harvest Starts at $10.80/User/Month when Billed Yearly.
Some top alternatives to Apollo includes Uptime, StatusCake, CHEQ.ONLINE, Uptime Robot, DevMonitor.io, UpTime.onl, Odown, Downtime Monkey, SiteUptime and 66uptime.
Some top alternatives to Harvest includes clockodo, Timesheets.com, TrackingTime, Clockify, TimeTrack, Time Track Bill, Timesheet, Hyperlogs, Timet and Time Tracker by eBillity.