These devices do not connect but they each have their merits. The Freestyle Libre is small and the Tandem is modern. The Tandem pump also allows you to bolus directly from a compatible iOS or Android smartphone.
The Freestyle Libre 14 day does not have high and low alerts. You get data only when you want it.
Next Steps
Freestyle Libre 14 Day

Next Step
Call Freestyle Libre and ask them about your coverage. Talk to your Doctor to get a prescription.
Tandem t:slim X2

Next Step
Call Tandem and ask them about your coverage. Talk to your Doctor to get a prescription.
Priorities
Comfort
Active Lifestyle
Avoiding Highs and Lows
Easy to Use
Easy Insulin Dosing
Fewer Fingersticks
Privacy
Wisdom
Hear what others who use this device combo have to say
Cost
Freestyle Libre 14 Day

Glucose Testing Supplies
Sensors
Reader (1 time purchase)
Glucose Testing Cost Estimate
Widely covered. Provided by pharmacies. Price range; $0-$100/month. Often the cheapest and easier to access sensor.
Tandem t:slim X2

Insulin Dosing Supplies
Pump
Charger
Insulin Cartridges
Infusion Sites
Insulin Dosing Cost Estimate
Startup $5 to $6,995
Monthly $20 to $200
Questions for your Doctor
Can I try this before I commit to it?
A lot of provider offices have sample devices you can touch and feel to get a sense of how they work. Some offices even have a trial device you can use for week to see how it works for you.