Cloudflare Sandbox SDK / Containers vs E2B
Cloudflare's Sandbox SDK starts container instances, each a microVM with its own kernel and network, controlled from a Worker. For teams already building on Cloudflare Workers. A 2 vCPU / 4 GiB sandbox lists at $0.180 an hour on Cloudflare Sandbox SDK / Containers against $0.166 on E2B, 9% more.
Visit Cloudflare Sandbox SDK / Containers Compare with E2B and others
Cloudflare Sandbox SDK / Containers against E2B, line by line
E2B baseline sourcesPrices are list prices for one hour of a 2 vCPU / 4 GiB sandbox: 2 × the vCPU rate + 4 × the memory rate. Each value links to the page it came from; not published means the vendor states no figure. How we compare.
Pick Cloudflare Sandbox SDK / Containers instead of E2B when
- your agents idle between tool calls: Cloudflare Sandbox SDK / Containers bills CPU only while it is busy, while E2B meters wall-clock time.
- your stack already runs on that cloud: Cloudflare Sandbox SDK / Containers is a first-party service there, so identity, billing and networking stay in one place.
Stay on E2B when
- pause has to keep running memory as well as files: E2B's pause saves both, and Cloudflare Sandbox SDK / Containers does not state memory state in our data.
- price decides it: Cloudflare Sandbox SDK / Containers lists $0.180 an hour for the 2 vCPU / 4 GiB box against $0.166 on E2B at full CPU; idle time between tool calls bills less.
- you want managed cloud, your own cloud account and self-hosting from one vendor: E2B offers all three, with BYOC on its Enterprise plan.
All Cloudflare Sandbox SDK / Containers facts
Source per value- Isolation Isolation technology the vendor states for each sandbox.
- Firecracker microVM 4
- Other isolation options Alternative runtimes the vendor offers besides the default (e.g. VM runtime, gVisor for GPU).
- Dynamic Workers (isolates) for JS/Python/Wasm 1
- Deployment Managed cloud service, self-hosted software, or both.
- managed 1
- Billing basis What the meter counts: wall-clock allocated resources, active CPU only, requests/plan quota, session-hours, or free software.
- active CPU 2
- vCPU price $/vCPU-hr Published on-demand CPU rate normalised to USD per vCPU-hour (per-second rates multiplied by 3,600; per-core rates divided by vCPUs per core where the vendor defines it). Lowest public tier, default region. 0 means the vendor states no separate CPU charge.
- $0.072 2
- Memory price $/GiB-hr Published memory rate normalised to USD per GiB-hour (GB treated as GiB where the vendor does not distinguish). 0 means the vendor states memory is free.
- $0.009 2
- Sandbox from $/sandbox-hr Smallest published per-sandbox hourly price, where the vendor publishes one.
- Not published
- Paid plan from $/mo Cheapest paid platform plan fee (before usage).
- $5.00 2
- Free tier A free plan, free monthly allowance or sign-up credit exists.
- No 1
- Free tier detail What the free tier or credit includes, as published.
- Workers Paid ($5/mo) includes 375 vCPU-minutes, 25 GiB-hours memory and 200 GB-hours disk per month. 1
- Cold start ms Vendor-published create/boot time in milliseconds (a vendor claim, not our benchmark). Only filled when the vendor publishes a number; see startup_claim for percentile and conditions.
- Not published
- Resume time ms Vendor-published resume-from-pause/standby/snapshot time in milliseconds.
- Not published
- Startup claim The vendor's startup/resume wording with conditions, quoted or closely paraphrased.
- Not published
- Max session length Longest single sandbox session by plan, as published.
- Not published
- Persistence / snapshots Filesystem state can be kept between runs (snapshots, persistent disks, volumes).
- Yes 1
- Pause / resume A sandbox can be paused, suspended, hibernated or put in standby and resumed later.
- Not published
- Memory state kept Pause/hibernate preserves running memory state, not only the filesystem.
- Not published
- Fork / branch A running or snapshotted sandbox can be cloned into new sandboxes.
- Not published
- GPU GPU sandboxes are offered.
- Not published
- Self-host Can run on your own hardware or cluster (open source or licensed).
- Not published
- BYOC / VPC Vendor-managed deployment inside your own cloud account.
- Not published
- Open source Core sandbox runtime is published under an open-source licence.
- Not published
- Licence Open-source licence of the runtime, if any.
- Not published
- SDKs / languages Official SDK languages (or supported execution languages where noted).
- TypeScript (@cloudflare/sandbox); any language inside the container 1
- Regions Published regions or region count.
- Not published
- Max vCPU per sandbox vCPU Largest published vCPU count per sandbox on any self-serve or enterprise plan.
- 4 1
- Max memory per sandbox GiB Largest published memory per sandbox.
- 12 1
- Concurrency Published concurrent sandbox limits by plan.
- Not published
- SOC 2 SOC 2 status as stated by the vendor.
- Type II 3
- HIPAA Vendor offers HIPAA-compliant usage/BAA (on any plan).
- Not published
- 2 vCPU + 4 GiB per hour $/hr Hourly list price of one 2 vCPU / 4 GiB sandbox: 2 x the vCPU rate + 4 x the memory rate, from the two published rates. Left empty for self-hosted software and for vendors without both rates. Vendors that bill CPU only while busy (Vercel, Cloudflare, Upstash, Tensorlake, AWS AgentCore) cost less for idle agents than this shows.
- $0.18 1
- Price vs E2B x E2B The 2 vCPU + 4 GiB hourly price divided by E2B's own ($0.1656 at $0.000014/vCPU-s and $0.0000045/GiB-s). Under 1 is cheaper than E2B.
- 1.09 1
- Status Preview, experimental, beta, sunset or self-hosting caveats the vendor documents.
- Not published
- Pricing model
- usage
- From
- $0.072 vCPU-hour
- Pricing note
- $0.000020/vCPU-s on active CPU; $0.0000025/GiB-s memory and $0.00000007/GB-s disk on the provisioned instance, beyond Workers Paid allowances; requires Workers Paid ($5/mo). Largest instance standard-4 (4 vCPU, 12 GiB). Pricing checked 2026-11-09.
Sources
- Sandboxes on Cloudflare accessed 2026-11-09
- Cloudflare Containers pricing accessed 2026-11-09
- Cloudflare Trust Hub accessed 2026-11-09
- developers.cloudflare.com/sandbox/concepts accessed 2026-11-11
Cloudflare Sandbox SDK / Containers in the E2B comparisons
- E2B alternatives from AWS, Azure, Google Cloud, Alibaba and CloudflareWhich cloud providers sell a first-party E2B alternative? 8 listed.
- E2B alternatives with microVM or VM isolationWhich E2B alternatives give each sandbox its own kernel? 26 listed.
Compare with other E2B alternatives
All 41- Amazon Bedrock AgentCore Code Interpreter vs E2B $0.217/hr, 1.31x E2B, microVM
- Alibaba Cloud vs E2B $0.071/hr, 0.43x E2B, VM
- AWS Lambda MicroVMs vs E2B no comparable hourly price, Firecracker microVM
- Azure Container Apps Dynamic Sessions vs E2B no comparable hourly price, Hyper-V
- Hopx vs E2B $0.166/hr, 1x E2B, Firecracker microVM
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