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I have been using TeslaFi for the past year and recently gave Tessie a try. While I think Tessie looks nicer, it doesn't provide as much useful information at a glance that TeslaFi does. Tessie has an app, but TeslaFi is web only.
I chose Stats, partly for the remote access tools (lets you create Siri shortcuts) and partly because I'd rather pay $50 for the app than get the app for "free" and pay ~$50/yr for the service behind the app.
