Fly.io vs Retool
Fly.io confirms 5 of the features we check on its own site; Retool confirms 4. Starting prices: Fly.io USD 2/mo · per Machine, Retool not published.
Fly.io
Developers running apps and AI agents on hardware-isolated VMs close to users.
Watch out: Support is paid by tier; standard first response is 36 hours.
Retool
Engineering and IT teams building internal tools on top of their own databases and APIs.
Watch out: Free plan lacks SSO, audit logs and granular roles.
| Overview & pricing | ||
|---|---|---|
| Category | Developer Tools & APIs | Developer Tools & APIs |
| Specialty | Cloud runtime | Internal app builder |
| Based in | 🇺🇸 United States | 🇺🇸 United States |
| Best for | All sizes | All sizes |
| Starting price | USD 2/mo · per Machine | Unconfirmed |
| Free plan | Unconfirmed | ✓Yes |
| Free trial | Unconfirmed | Unconfirmed |
| Features confirmed on each vendor’s site | ||
| Free tier for developers · Core features | ✓Start for free, pay as you grow | ✓Free plan at $0, up to 5 users |
| REST / GraphQL API · Core features | Unconfirmed | ✓Connect to any REST API or GraphQL |
| CLI · Core features | Unconfirmed | ✓Use MCP server or CLI to build apps |
| Monitoring / logs · Core features | ✓Monitoring listed as a feature | Unconfirmed |
| Choice of data regions · Core features | ✓Machines available in many regions | Unconfirmed |
| Usage-based billing · Core features | ✓Compute billed by the second | Unconfirmed |
| Public documentation · Core features | ✓Platform Docs linked | ✓Docs for MCP, CLI and app import |
| SSO / SAML · Security & compliance | Unconfirmed | ◐SSO, SCIM, 2FA not included in Free plan |
| Two-factor authentication · Security & compliance | Unconfirmed | ◐2FA not included in Free plan |
| Roles & permissions · Security & compliance | Unconfirmed | ◐Granular roles not included in Free plan |
| Audit log · Security & compliance | Unconfirmed | ◐Audit logs not included in Free plan |
| Integrations | ||
| Listed on its site | Unconfirmed | OpenAI, Google Sheets, PostgreSQL, Firebase, GraphQL, Claude Code, AlloyDB, Amazon Athena, Amazon Bedrock, Amazon DynamoDB, Lovable, Replit, GitHub |
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Every ✓ / ✕ comes from the vendor’s own website (sources on each product page). Unconfirmed means the site doesn’t say — not that the feature is missing.