Buddy

The Buddy unlocks the relevant features of djay however, the full version requires a subscription. When connecting your Buddy to your device, djay may present a pop-up prompting you to subscribe. This is optional and the pop-up can be closed to continue using your Buddy with its included features.

See Buddy Setup Guide.

No, you do not need a pro subscription. You can download the free djay app in the respective app store and connect your Reloop Buddy via plug and play. The Reloop Buddy works out of the box with the djay app on many platforms without any subscription or further payment. Algoriddim has recently merged their apps into one app, but added subscriptions for pro features (e.g. video mixing, Neural Mix, pre-cueing, recording, etc.). When you connect the Buddy controller to djay, it unlocks (for free) some of these pro features. In summary, each feature or mode found on the controller does not require a pro subscription (e.g. Neural Mix, looper, sampler & pre-cueing). Other pro features (e.g. video mixing), which are not accessible via a direct Buddy control, still require a pro subscription.
Please note that the app feature set may vary, depending on the platform being used.
Please visit the djay app page on the respective platform’s app store to check which features are supported.
https://www.algoriddim.com/apps

See Djay Comparison Chart.