@worldburger Grafana’s interface is pretty if you are looking for a free alternative. I know SORACOM has a “free” hosted version. (you need to use their data pipeline though 
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I actually self-host my instance using InfluxDB as the backend. It’s been running since early April in one capacity or another. If you’re not afraid of a little bit of Docker dev ops you can get it up and running quick. Plus it integrates nicely with Particle Webhooks. 