Runtime & limits
Your app runs around the clock on dedicated compute. No cold starts, no request timeouts.
Apps run as long-lived processes, not serverless functions. Your process can run indefinitely, hold connections open, and do background work. There are no cold starts and no request timeouts.
Always on
On every plan, your app runs 24/7. It doesn't sleep between requests, and it restarts itself if it crashes. This is true on the free plan too.
App size: CPU and memory
You buy compute and split it across as many apps as you want. Each app gets a size you choose, and CPU rides with memory, so there's one knob, not two. Every account starts with a free 256 MB of compute. Buy more for $5 a month per 512 MB and the choices look like this:
| App size | CPU | Good for |
|---|---|---|
| 256 MB (free) | 0.25 vCPU | A test or preview app. Start here. |
| 512 MB | 0.5 vCPU | A Python cron job or a small script. |
| 1 GB | 1 vCPU | A Node API with light traffic. |
| 2 GB | 2 vCPU | A small Go service. |
| 4 GB | 4 vCPU | A heavier app, or more traffic. |
See pricing for the full breakdown. There's no limit on the number of apps, only on how much compute you've bought, so you can run many small apps or a few large ones from the same pool. If an app is bumping against its memory or CPU, the dashboard shows it live (see Logs & monitoring) and you can resize it in one click from its Size tab.
Network access
Every app has full outbound internet on every plan: LLM APIs, third-party services, package registries, anything reachable over HTTPS. Apps are isolated from each other and can't reach other tenants' apps. That isolation is enforced at the network layer, not left to your config.
Variables Dockhold injects
These are set for you in every app. Read them; don't define them.
PORT # the port your app must listen on, on 0.0.0.0
DATABASE_URL # set when the managed database add-on is onOn top of those, you get any plain variables you set in the dashboard and any secrets you bound from the Vault. See Environment variables & secrets.