It is not mandatory to sync with Apple Health for Pacer to work. If you do not sync with Apple Health, Pacer is still able to read data directly from your device's motion processors.
However, there are some advantages to syncing with Apple Health:
- Health can serve as a data backup in case anything ever happens to your Pacer app
- Health lets Pacer display data from other data sources like other apps and wearables like the Apple Watch