Fly.io
vs
Vast.ai
What's good about each
- Excellent tooling and developer experience
- Fast deployments, scale to zero, little config needed
- Per-second billing, with a 40% discount for reserved compute blocks
- Anycast networking and global load balancing included at no extra cost
- Budget cards to Blackwell, including the RTX PRO 6000 and B200
- On-demand, interruptible and reserved rentals
- SOC 2 Type II certified, with vetted datacenter hosts in Secure Cloud
- Host reliability ratings and GPU performance benchmarks
- REST API, CLI, Python SDK and coding agent plugins
Price comparison
Closest matching configuration on each side, monthly list price in USD.
| Service | Fly.io | Vast.ai | Difference |
|---|---|---|---|
| Small VM | $5.70 /mo 1 vCPU, 1 GB RAM (shared-cpu-1x) | -- Not listed | |
| Medium VM | $42.79 /mo 4 vCPU, 8 GB RAM (shared-cpu-4x) | -- Not listed | |
| Large VM | $248.00 /mo 8 vCPU, 16 GB RAM (performance-8x) | -- Not listed | |
| Block storage | $15.00 /mo 100 GB | -- Not listed | |
| Object storage | $20.50 /mo 1 TB (Tigris) | -- Not listed | |
| PostgreSQL | $86.00 /mo 2 vCPU, 2 GB RAM, 50 GB storage (Starter) | -- Not listed | |
| Redis | $20.00 /mo 1 GB data (Upstash Fixed 1GB) | -- Not listed | |
| Load balancer | Included with apps | -- Not listed | |
| Egress | $20.00 /TB $0.02 / GB (North America and Europe) | -- Not listed |
Heads up: Figures take each provider's closest plan to a common setup, and vary by region and usage. Hover a service for the reference configuration. Verify before provisioning. More on how we price.
GPUs
Vast.ai offers 66 GPU models. We track no GPU listings from Fly.io. Cheapest listed price per GPU per hour; GPUs both providers sell come first.
| GPU | Fly.io | Vast.ai | Difference |
|---|---|---|---|
H100
49 configs
|
-- | $0.41 /GPU/hr Spot | Vast.ai only |
|
B300
6 configs
|
-- | $5.20 /GPU/hr Spot | Vast.ai only |
|
B200
8 configs
|
-- | $5.94 /GPU/hr Spot | Vast.ai only |
|
RTX PRO 6000
90 configs
|
-- | $0.27 /GPU/hr Spot | Vast.ai only |
|
H200
34 configs
|
-- | $1.32 /GPU/hr Spot | Vast.ai only |
|
RTX 5090
181 configs
|
-- | $0.18 /GPU/hr Spot | Vast.ai only |
|
A100
86 configs
|
-- | $0.18 /GPU/hr Spot | Vast.ai only |
|
RTX 4090
177 configs
|
-- | $0.18 /GPU/hr Spot | Vast.ai only |
|
L40S
43 configs
|
-- | $0.33 /GPU/hr Spot | Vast.ai only |
|
RTX 3090
104 configs
|
-- | $0.08 /GPU/hr Spot | Vast.ai only |
Vast.ai bills on-demand, spot and reserved (1, 3, 6, 12, 24, 36 or 48 months). The line under each price names the billing type shown.
Services
Managed services each provider offers.
Compliance
Frameworks each provider states on its own site, each linked to its source.
| Framework | Fly.io | Vast.ai |
|---|---|---|
| SOC 2 | Type II | Type II, platform only |
| ISO 27001 | Data centers only | -- |
| HIPAA | Yes | Secure Cloud tier only |
| GDPR | Yes | Yes |
Heads up: Each entry links to the provider's own statement. An attestation can cover one tier, one region or the platform alone rather than every service. Verify the scope before you rely on it. A dash means we found nothing to link to, not that the provider lacks it.
Company details
Alternatives to consider
Compare Fly.io and Vast.ai against other cloud providers.
Our data for Fly.io was last updated on Sept. 18, 2026, and for Vast.ai on Oct. 2, 2026.