DevicePilot is "free forever" for developers, then moves to a fixed monthly fee for trials. As your device volume grows, billing moves to a low per-device, per-month fee based on the previous month's Monthly Active Devices (MAD!). We bill by devices (rather than e.g. by data, users etc.) to keep your costs predictable. Contact us at any time for volume pricing.
We are confident that once you've factored-in your costs (including people costs), and the costs of not knowing what is going-on with the devices in your customers' hands, you'll recognise that DevicePilot is an extremely cost-effective solution from day one.