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Yes, both Blynk and Azure IoT Central offer a Free Trial.
Blynk is designed for Large Enterprises, Medium Business and Small Business.
Azure IoT Central is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Blynk Starts at $1,000/Month whereas for Azure IoT Central Starts at $0.08/Month.
Some top alternatives to Blynk includes Wia, Qualified, Workvivo, AWS IoT Core, Kaa, CloudPlugs, Azure IoT Solution Accelerators, Sqira, Azure IoT Central, IBM Watson IoT Platform and Thinger.io.
Some top alternatives to Azure IoT Central includes Telit IoT Platforms, IoTWorX, Coiote IoT Device Management, CloudPlugs, Azure IoT Solution Accelerators, Azure IoT Hub, IBM Watson IoT Platform, AWS IoT Device Management and Friendly One-IoT Device Management.