Convex vs Fly.io: what each really costs
Team size
Billing
Convex
No plan for this billing option
No paid plan to compare for this billing option.
Fly.io
No plan for this billing option
No paid plan to compare for this billing option.
| 10 people | Convex | Fly.io |
|---|---|---|
| Entry paid plan | No plan for this billing option | No plan for this billing option |
| Vendor price | ||
| Monthly cost | ||
| Annual cost | ||
| Per user / year | ||
| Billing commitment | Not recorded | Not recorded |
| Minimum seats | None stated | None stated |
| Free plan | Yes | No free plan listed |
| Free trial | Not stated | Not stated |
Calculated by SpecEntry from official vendor prices. Taxes and optional add-ons are not included. Open each product page for every plan and the official source.
Convex vs Fly.io: features
Key features as each vendor lists them. A feature missing from a list does not mean the product lacks it.
Convex
- TypeScript backendDatabase, functions, sync, search and file storage written in TypeScript.
- ACID transactionsACID transactions protect data during concurrent writes.
- End-to-end type safetyType safety from database to client catches errors early.
- Real-time syncUsers see the latest data instantly.
- Automatic caching and scalingCaching and scaling are handled automatically.
- Durable workflowsMulti-step processes that checkpoint, retry and resume.
- Background jobsRun model calls and background jobs with retries and parallelism.
- Convex ComponentsSandboxed, open-source building blocks for your app.
Source:convex.dev ·
Fly.io
- Fly MachinesHardware-virtualized containers that launch instantly and run on demand.
- Isolated sandboxesHardware-isolated sandboxes for running untrusted or AI-generated code.
- Sprites environmentsEach Sprite is a self-contained environment ready in under a second.
- Checkpoint and restoreCheckpoint an entire environment and restore it after breaking changes.
- NVMe and object storageLocal NVMe for low latency plus global durable object storage.
- Agent-ready CLIs and MCPCLIs and MCP servers designed to be driven by AI agents.
- KVM hardware isolationApps run KVM hardware-isolated on Fly.io's own hardware.
Source:fly.io ·
Convex vs Fly.io pricing questions
How much do Convex and Fly.io cost?
Convex paid plans start at $25 per developer per month (Professional). Fly.io paid plans start at $2.19 per month ($0.0030/hr), billed per second (Machine shared-cpu-1x 256MB).
Is Convex or Fly.io cheaper for 5 users?
Fly.io is cheaper for 5 users: $348 per year on Standard support, against $1,500 per year for Convex on Professional. That is $1,152 less per year, before tax.
Is Convex or Fly.io cheaper for 10 users?
Fly.io is cheaper for 10 users: $348 per year on Standard support, against $3,000 per year for Convex on Professional. That is $2,652 less per year, before tax.
Is Convex or Fly.io cheaper for 25 users?
Fly.io is cheaper for 25 users: $348 per year on Standard support, against $7,500 per year for Convex on Professional. That is $7,152 less per year, before tax.
Do Convex and Fly.io have a free plan?
Convex lists a free plan; Fly.io does not list one on its official pricing.