1. Can I use ThingSpeak™ for free?
Commercial users may sign up once for a time-limited free evaluation. All other commercial uses require a standard commercial license. Non-commercial users can use ThingSpeak for free subject to the limitations of the free license option. Users of the free option will be limited to sending no more than 3 million messages each year to the ThingSpeak service. Users of the free license will also be limited to 4 channels. For users of the free option, the message update interval limit remains limited at 15 seconds. Other limitations are described on the How to Buy pages.
