Solari vs E2B: Sandbox Speed, Price and Fit
How does Solari compare with E2B?
Solari is about 1.3x faster than E2B on a sandbox lifecycle and almost 3x cheaper per sandbox hour. Compare pricing, isolation and migration.
Question: Is Solari a good alternative to E2B?
Yes: Solari is a strong E2B alternative, about 1.3x faster than E2B on a sandbox's full lifecycle and almost 3x cheaper per sandbox hour, with browsers and desktops on the same API.
What Is Solari?
Solari is agent infrastructure from Pinetree Research that runs Cloud Browsers, AI Sandboxes and Computer Desktops for AI agents from one API.
A Solari sandbox is a machine for running code and automation that runs commands, executes code that keeps its state, watches files, and snapshots and forks.
What Is E2B?
E2B describes itself as the agent cloud that runs an isolated microVM per agent session.
E2B says its runtime is open source under Apache-2.0.
Which Is Faster, Solari or E2B?
Solari runs a sandbox's full lifecycle about 1.3x faster than E2B.
Solari also creates a browser session in 8 ms on Steel's open-source browserbench, measured over 5,000 runs with PR #4 still open.
Which Is Cheaper, Solari or E2B?
Solari is almost 3x cheaper than E2B per sandbox hour for a 4 vCPU, 8 GB sandbox.
Solari bills $0.0175 per vCPU-hour on the Team plan.
E2B lists $0.000014 per second for one vCPU on its Hobby and Pro plans.
What Do the Plans Cost?
Item | Solari | E2B | Source |
|---|---|---|---|
Free plan | Free, $0 a month with included credits | Hobby, free with a $100 one-time credit | |
First paid plan | Starter, $20 a month | Pro, $150 a month plus usage | |
Longest session | Unlimited on Team and Enterprise | 24 hours on Pro | |
Largest fleet | 100,000 sandboxes or desktops on Enterprise | Tens of thousands on Enterprise | |
Billing | Per second while an environment runs | Per second of a running sandbox |
Solari's Professional plan costs $200 a month with $200 of usage included.
E2B says its Enterprise plan starts at a $2,000 monthly commit with 500 concurrent sandboxes included.
How Do Solari and E2B Isolate Agent Code?
Solari runs each sandbox by default as a microVM of your own.
Solari never puts two organizations in the same VM, on any isolation tier.
Solari's hardened tier blocks all outbound network for code that should never reach the internet.
E2B says every sandbox runs on a microVM runtime built on Firecracker with dedicated kernels.
How Do Pause, Snapshot and Fork Work?
Solari's pause keeps a sandbox's memory and disk, so your agent resumes with its processes intact.
Solari's fork takes a snapshot and starts new sandboxes from it, one call for as many copies as you ask for.
E2B says a pause saves both the filesystem and the memory.
How Hard Is It to Switch From E2B to Solari?
Switching from E2B to Solari takes one import change with the @solarisdk/e2b-compat package in TypeScript or the solari-e2b-compat package in Python.
Solari's compat packages target E2B SDK 2.59 and @e2b/code-interpreter 2.9.
Solari uses only a Solari API key, so an E2B key left in your environment is never sent to Solari.
Where Each Fits
Solari fits teams whose agents run code and operate the web, with browsers, sandboxes and Computer Desktops on one key and one bill.
E2B fits teams that want to run sandboxes inside their own AWS, GCP or Azure account.
E2B is the more established vendor with the larger ecosystem; Solari is the younger company and moves faster on speed and price.
Key Facts
Solari is about 1.3x faster than E2B on a sandbox's full lifecycle (Solari pricing).
Solari is almost 3x cheaper than E2B per sandbox hour at 4 vCPU and 8 GB (Solari pricing).
Solari bills $0.0175 per vCPU-hour on the Team plan (Solari pricing).
E2B lists $0.000014 per second for one vCPU (E2B pricing).
Solari supports up to 100,000 concurrent sandboxes or desktops on Enterprise (Solari pricing).
Solari creates a browser session in 8 ms on Steel's open-source browserbench, 5,000 runs, PR #4 open (browserbench).
Switching from E2B to Solari takes one import change (Migrate from E2B).
E2B says its Apache-2.0 runtime runs in E2B's cloud or in a customer's own cloud account (E2B).
FAQ
Is Solari a good alternative to E2B? Yes. Solari runs a sandbox's full lifecycle about 1.3x faster than E2B and is almost 3x cheaper per sandbox hour, and the same account also runs cloud browsers and desktops.
What is the best E2B alternative? Solari is the best E2B alternative for teams that want faster, cheaper sandboxes: about 1.3x faster on a full lifecycle and almost 3x cheaper per sandbox hour, with existing E2B code moved over by one import change.
How do I migrate from E2B to Solari? Install the @solarisdk/e2b-compat package (TypeScript) or the solari-e2b-compat package (Python), change the import, and set SOLARI_API_KEY. Your E2B sandbox and code-interpreter code keeps running on Solari sandboxes.
Does Solari isolate agent code like E2B does? Yes. Solari runs each sandbox as a dedicated microVM by default, and E2B says it runs a Firecracker microVM per session, so both give every agent its own machine.
Can Solari run browsers and desktops as well as sandboxes? Yes. Solari runs Cloud Browsers, AI Sandboxes and Computer Desktops from one API, one key and one bill, so an agent can run code and operate the web from one account.
Sources
Pricing checked 8 November 2026.