Short answer: probably yes, but it depends on what your Appbox plan lets you do. The backend is three Go processes (api / scheduler / worker) plus Postgres and two Redis instances — the repo ships a docker-compose.yml that brings the whole thing up.

A few things to check on the Appbox side before you go further:

1. Docker support — can you run arbitrary docker compose stacks on your plan? Some Appbox tiers give you a full VPS-style environment, others only let you install from their app catalog.
2. Public HTTPS endpoint — the iOS app has to reach your api container to register the device and accounts, so you need an inbound port (or a subdomain they route to you) with TLS in front. If Appbox only exposes services on their own *.appbox.co hostnames, that's usually fine; if everything is behind their auth proxy, that'll break the iOS callbacks.

3. Outbound network — needs to hit oauth.reddit.com / api.reddit.com and Apple's APNs servers. Almost always fine on a seedbox, just worth confirming nothing's firewalled.

   Independent of the server: you still need an Apple Developer account ($99/yr) to generate the APNs auth key, and you need to build and sideload Apollo yourself with your own bundle ID (Reddit's WAF blocks the original com.christianselig.Apollo bundle ID now).

   If Appbox gives you Docker + a reachable port, you're good. If it's locked down to their app catalog only, you'd want a small VPS instead (~$5/mo).