Both are commercial runtime & deploy options with comparable terms, so the choice comes down to which model of the problem you prefer — compare the descriptions below rather than the licence.
Python-native serverless with GPUs and sandboxes, scale to zero.
Long-running containers close to users, without owning a Kubernetes cluster.
| Modal | Fly.io | |
|---|---|---|
| Licence | Proprietary | Proprietary |
| Pricing | freemium | usage based |
| Self-hostable | No | No |
| Languages | Python | Any language |
| Install | pip install modal | brew install flyctl |
| Keys required | MODAL_TOKEN_ID, MODAL_TOKEN_SECRET | None |
Both are commercial runtime & deploy options with comparable terms, so the choice comes down to which model of the problem you prefer — compare the descriptions below rather than the licence. Modal: Python-native serverless with GPUs and sandboxes, scale to zero. Fly.io: Long-running containers close to users, without owning a Kubernetes cluster.
Modal is a hosted service only. Fly.io is a hosted service only.
Modal is proprietary (freemium). Fly.io is proprietary (usage based).
Every page here answers to Accept: text/markdown and returns the same content at roughly a tenth the tokens. No separate site, no toggle — same URL.
curl -s -H "Accept: text/markdown" https://newagent.build/compare/modal-vs-fly