What's good about...
FlexStack
- One-click deploy to AWS without complicated infrastructure or templates
- Easy-to-use dashboard and excellent documentation
- No vendor lock-in - uses your own AWS account and can "eject" anytime
- Generous free tier with affordable monthly plans
Vast.ai
- 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
FlexStack Pricing
FlexStack charges a fixed subscription fee on top of your AWS usage. It's available in three plans including a free tier:
- Starter $0/mo: Includes 1 environment, 1 team member and 2 running services.
- Indie $9/mo: Includes 10 environments, 1 team member and 50 running services.
- Team $29/user/mo: Unlimited environments, team members and services.
You can view the complete list of features on their pricing page.
Vast.ai Pricing
Hosts set their own rates. Compute is billed per second from prepaid credits. Storage charges continue while an instance is stopped, and bandwidth fees vary by host.
- On-demand: Fixed rates for the offer's maximum duration.
- Interruptible: Bid for capacity. Instances pause if you're outbid or an on-demand renter takes the machine.
- Reserved: Prepay for a fixed term, with larger discounts for longer commitments.
GPU Fleet Overview
Billing Options
FlexStack
Vast.ai
Available Models
Vast.ai offers 23 GPU models.
FlexStack
H100Heads up: A provider's own page may quote a different figure, for example on tax, region or a promotion. A monthly-only plan shows a derived hourly rate. Plan figures take each provider's closest match to a common setup. Verify before provisioning. More on how we price.
Which services do they offer
Here are some managed services that FlexStack and Vast.ai offer:
Company details
|
FlexStack
|
Vast.ai
|
|
|---|---|---|
| Website | flexstack.com | vast.ai |
| Headquarters |
United States of America 
|
United States of America
|
| Founded | 2024 | 2018 |
| Data Center Locations | -- | 10 |
| Example Customers | -- | IBM, Brave, Speechify, Cognition, Bosch |
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Alternatives to consider
Compare FlexStack and Vast.ai against other cloud providers.
Our data for FlexStack was last updated on Feb. 12, 2026, and for Vast.ai on Sept. 11, 2026.