Definition
Backend plumbing (auth, database, hosting, monitoring, etc.) provided by the platform so the user doesn't have to wire up Supabase / Auth0 / Vercel / Sentry separately.
Comparison
| Service | Replit | Anything.com | Fly.io |
|---|---|---|---|
| Authentication | ✅ built-in | ❓ not confirmed | Via Fly + partners (not bundled with a builder) |
| Database | ✅ built-in | ✅ top-level nav (Anything.com - Databases) | ✅ Flydotio - Managed Postgres + Tigris + Upstash |
| Hosting | ✅ built-in | ✅ implied (Domains + publishing) | ✅ Flydotio - Fly Machines — the base product |
| Monitoring | ✅ built-in | ❓ not mentioned | ✅ built-in metrics / logs / error tracking |
| Custom domains | ✅ (Replit Docs) | ✅ top-level nav (Anything.com - Domains) | ✅ first-class |
| Payments | Via Stripe integration | ✅ first-class (Anything.com - Accept Payments) — see Built-in Payment Acceptance | ❌ Not a Fly concern |
| GPU compute | ❌ | ❌ | ✅ Flydotio - Fly GPUs |
| Agent sandbox | ❌ | ❌ | ✅ Flydotio - Sprites |
| Integration catalog | "100+" — OpenAI, Stripe, Google Workspace named | "40+" claimed | N/A — different category |
Key differences
- IA choice (Replit vs. Anything). Replit hides platform services behind "zero-setup" messaging. Anything promotes Databases / Domains / Accept payments to top-level nav — the user should manage them directly.
- Fly.io sits underneath. Fly's "built-in services" are actually the product, not a convenience layer — you rent the compute and the database directly. It's not in the same IA conversation as the builders; there is no builder to hide things from.
- Why it matters: the builders answer "what do you need to ship an app?" while Fly answers "what primitives do you need to operate cloud workloads?" — the overlap is real but the buyer's mental model differs.