I'm running xDrip without a Dexcom receiver, there is no need for a Dexcom receiver.
xDrip has no concept of a '7 day sensor'. You start it, then use it till you remove it, my last/first sensor lasted 23 days. There is a sensor stop/stop option but it advises not to use them unless you actually remove the sensor.
xDrip calibration is pretty much the same as Dexcom, double calibration at startup, then 12 hourly. xDrip also has an option to turn off calibration alerts.
Couple of things to be aware of :-
- xDrip shows you raw data, whereas Dexcom 'massages' the data to give you a smoother/slower trend on sudden movements. I prefer the raw data.
- currently xDrip (wixel bridge) is missing a couple of readings (around 10ish a day, mainly overnight), xDrip and wixel devs are working on it.
- its a product in constant development, but it is also constantly improving. I'm now on my 3rd release of xDrip app and have had 2 updates to the wixel bridge.
I've been meaning to write a review and thoughts on this setup, I will do so shortly.
The only downside I can see for running without a Dexcom receiver is that I may have difficulty dealing with Dexcom if I try to get a faulty sensor replaced.
**Update, xDrip doesn't show raw data, it is slightly smoothed, hopefully they will add an option to show raw data