Runtime pricing
Runtime charges $0.025 per active vCPU-hour and $0.0075 per reserved GiB-hour of memory, with no plan fee and credit matched in a new account's first 30 days, which makes it 42% to 88% cheaper than fourteen other sandbox providers for an agent that spends most of its time waiting on a model.
| What you use | Price |
|---|---|
| Active CPU | $0.025 per active vCPU-hour |
| Memory | $0.0075 per reserved GiB-hour |
| Plan fee, seats, minimum | None |
| Single sign-on, SCIM, audit log, roles | Free on every account |
| Outbound traffic | 100 GiB a month free, then $0.02 per GB |
| Included usage | 100 free hours of a 1 GB machine a month once an account has paid |
What a sandbox costs
| Sandbox | Waiting on a model | Fully busy |
|---|---|---|
| 2 vCPU, 4 GiB, per hour | $0.03125 | $0.08 |
| 16 vCPU, 64 GiB, per hour | $0.48125 | $0.88 |
| 1,000 one-minute runs of 2 vCPU, 4 GiB | $0.64 | $1.33 |
Waiting means memory plus the default CPU floor of 50 millicores, a twentieth of a vCPU. Compute has no one-minute minimum, and memory is billed while compute runs. A GiB is 1,073,741,824 bytes. Reserved CPU, for code that needs every core all the time, bills each vCPU as if it were always busy.
Compared with other sandbox providers
The same agent job at each provider's published rates: 1,000 runs of 2 vCPU and 4 GiB, 60 seconds each with 20 CPU-seconds of work, the rest spent waiting on a model.
| Provider | CPU and memory for 1,000 runs | Runtime saves |
|---|---|---|
| Runtime | $0.64 | — |
| Northflank | $1.11 | 42% |
| Cloudflare Sandbox | $1.35 | 53% |
| Prime Sandboxes | $1.52 | 58% |
| Fly Machines | $1.53 | 58% |
| Morph | $1.67 | 62% |
| Vercel Sandbox | $2.12 | 70% |
| Freestyle | $2.25 | 72% |
| Fly Sprites | $2.40 | 73% |
| CodeSandbox | $2.48 | 74% |
| E2B | $2.76 | 77% |
| Daytona | $2.76 | 77% |
| Blaxel | $3.45 | 81% |
| Modal | $3.97 | 84% |
| AWS Lambda MicroVMs | $4.20 | 85% |
| Runloop | $5.33 | 88% |
Rates checked 25 October 2026. Plan fees, storage, network, free credits and negotiated prices are left out of every row. Each provider's page shows its rates, its sources and the arithmetic. Once you have run on Runtime, runtime compare --from <provider> prices your own sandboxes both ways.
Storage
| What you keep | Price |
|---|---|
| Paused sandbox, files and memory | $0.08 per decimal GB per 30-day month |
| Snapshot | $0.08 per decimal GB per 30-day month |
| Custom image | $0.08 per decimal GB per 30-day month |
| Volume | about $0.11 per GiB per 30-day month |
| Volume backup | $0.02 per decimal GB per 30-day month; one made before this price keeps $0.012 until 7 November 2026 |
Building an image is free. A paused sandbox or a snapshot is charged on the blocks it alone stores, and a volume on the full size you create it with. Each item's rate is fixed when you make it, and a new price reaches it only from a date announced ahead.
Network
| What you use | Price |
|---|---|
| Inbound traffic | Free |
| Outbound traffic, first 100 GiB a month per account | Free |
| Outbound traffic past that | $0.02 per decimal GB |
| Traffic between sandboxes in the same region | Free |
| Dedicated IPv6, custom domains, TCP ports | Included |
| Dedicated IPv4 address | $5 per 30-day month |
| WireGuard tunnel, up to 16 peers | $5 per 30-day month |
Limits
| Free usage | Paid account | |
|---|---|---|
| Sandboxes at once | 4 | 100 |
| Largest sandbox | 2 vCPU, 4 GiB, 10 GiB disk | 16 vCPU, 64 GiB, 400 GiB disk |
| Across running sandboxes | — | 200 vCPUs and 400 GiB |
A paid account has the full limits from its first top-up. The limits are a starting point, not a price tier; to run more, write to support with the numbers you need.
Security and team features
What other providers sell as an enterprise plan or a paid add-on is free on every Runtime account. There is no seat fee, and a company pays the same rates as one person.
| Feature | Price |
|---|---|
| Single sign-on over SAML or OIDC: Okta, Microsoft Entra ID, Google Workspace or any SAML 2.0 or OpenID Connect provider | Free |
| Requiring single sign-on for everyone but owners | Free |
| Directory sync over SCIM, with roles from your directory's groups | Free |
| Roles: owner, admin, developer and billing, for as many people as you need | Free |
| Audit log, kept at least 400 days, as CSV or over the API | Free |
| Two-step sign-in with a passkey or an authenticator app, which an owner can require | Free |
| Read-only keys, daily limits per key and compartments | Free |
| Data processing addendum, part of every account's terms | Free |
| Uptime promise: 99% API uptime a month, 10% back automatically when missed | Free on paid accounts |
Security and compliance is the summary a security review asks for, and rolling Runtime out to your company is the order to set it up in. For a questionnaire, write to security@withruntime.com.
How you pay
Add credit by card before your first sandbox; credit a new account adds within 30 days of signing up is matched, up to $1,000. Add it at Usage & billing, any amount from $10 to $10,000, with no subscription needed. Read-only keys, a daily limit per key and maxCostMicros on a create cap what an agent can spend.
Questions
Is there a free tier?
No free usage before you pay. You add credit by card from $10, and credit a new account adds within 30 days of signing up is matched, up to $1,000 in total. Once an account has paid, 100 free hours of a 1 GB machine is included every month, renewed on the 1st: 100 GiB-hours of memory and 25 vCPU-hours of active CPU.
Is there a subscription or a minimum?
No. You prepay credit by card, any amount from $10 to $10,000, and usage is taken from it. There is no plan fee, no seat price and no commitment.
What happens when my credit runs out?
Your balance never goes below zero and you never owe money. Stopped and paused sandboxes are kept 30 days if you have bought credit or saved a card, and other stored items seven days; adding credit within those days starts them again with the unpaid days written off.
Why is an idle sandbox so cheap?
CPU is billed on what your code uses, above a floor of 50 millicores. A 2 vCPU, 4 GiB sandbox waiting on a model costs $0.03125 an hour, memory plus that floor; providers that bill every allocated vCPU charge for both CPUs the whole time.
Is network traffic charged?
Inbound traffic is free, and each account's first 100 GiB out a month is free. Past that, what sandboxes send to the internet, including what they serve through previews, custom domains and TCP ports, costs $0.02 per GB. Traffic between sandboxes in the same region is free: bytes a sandbox serves through a preview or a port to another sandbox in its region are not counted and do not use the free 100 GiB. Trial sandboxes are not charged for traffic. A dedicated IPv4 address or a WireGuard tunnel costs $5 per 30-day month each.
Can I run more than the limits?
Yes. The limits are a starting point, not a price tier, and a create past one costs nothing. To run more, write to support with the numbers you need.
Do single sign-on, the audit log and roles cost extra?
No. Single sign-on over SAML or OIDC, SCIM directory sync, the four roles, the audit log, two-step sign-in and the data processing addendum are free on every account, with no seat fee.
Is the credit I add matched?
Yes. Credit a new account adds within 30 days of signing up is matched, up to $1,000 in total across every payment, wherever you are moving from. Referring someone gets you both their first 30 days of credit matched, up to $1,000 each, and then 10% of what they spend for 12 months; a referred account gets the referral's match instead of the welcome match, never both.
More
- Understand your sandbox bill: every rate in full, paused storage, running out of credit and the welcome match.
- Free usage, Choosing an agent sandbox, cost calculators and the agent sandbox price index, with CSV and JSON.
- For agents: llms.txt is the quickstart, and https://withruntime.com/pricing.md is this page in Markdown.