Modal vs Northflank

Modal

Scale to zero by default, per-second billing and about one-second container boots. No REST API or OpenAPI spec for deploying or invoking Functions.

Northflank

OpenAPI 3.0 with over 100 paths, enums and per_page, page and cursor on every list. No scale to zero for services; minimum instances must be at least 1.

Modal

1. Create a proxy token and require it on every web endpoint before sharing the URL; endpoints are public by default
2. Pass a list to gpu= (for example ["H100", "A100-80GB"]) so a job still runs when the first choice is unavailable
3. Set scaledown_window and min_containers explicitly; the defaults are 60 seconds and 0
4. Use .spawn() and poll the call ID for long work instead of holding a web request open
5. Keep web endpoint traffic under 200 requests a second or ask Modal to raise the limit

Northflank

1. Issue the agent a team token under an API role limited to one project, not a personal token
2. Read x-ratelimit-remaining and wait x-ratelimit-reset seconds on a 429; the default is 1,000 calls an hour
3. Page lists with per_page up to 100 and the returned cursor instead of numbered pages
4. Use a job, not a service, for anything that finishes; services bill until paused or deleted
5. Fetch any docs page with .md appended to get Markdown