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Butter
AddedJul 4, 2026
UpdatedJul 4, 2026
Butter

Butter

Acquired

Develops bVisor, a lightweight embedded sandbox runtime for AI agents.

HQ
San Francisco, CA, US
Founded
2024
Accelerator
Y Combinator logoY CombinatorW25
Overview
M & A
Analysis
Compare
Employees
News

Butter builds bVisor, a lightweight sandbox runtime that embeds directly into a developer's local process to give AI agents a safe bash execution environment. Unlike virtual machines or remote sandbox services, bVisor starts sandboxes in milliseconds and virtualizes Linux syscalls from userspace using seccomp user notifier.

bVisor is aimed at agent builders who need deterministic, low-overhead command execution on the host machine. It is published as an open-source project and ships with a TypeScript SDK. The company was part of Y Combinator's Winter 2025 batch and was acquired by Modal Labs in April 2026.

Butter - M & A Snapshot

Open M & A
  • Modal Labs

    Acquired Butter • Undisclosed • Apr 10, 2026

Butter - Products & Services

  • bVisor logo

    bVisor

    bVisor is a lightweight embedded bash sandbox runtime for AI agents.

    Competing Products

    E2B logo
    Modal Labs logo

Butter - Similar Companies

Modal Labs logo

Modal Labs

modal.com

E2B logo

E2B

e2b.dev

Runlayer logo

Runlayer

runlayer.com

Blaxel logo

Blaxel

blaxel.ai

Klavis AI logo

Klavis AI

klavis.ai

Dosu logo

Dosu

dosu.dev

BentoLabs AI logo

BentoLabs AI

bentolabs.ai

ReasonBlocks logo

ReasonBlocks

reasonblocks.com

Blitzy logo

Blitzy

blitzy.com

AnythingLLM logo

AnythingLLM

anythingllm.com

Rogo logo

Rogo

rogo.ai

ProjectX logo

ProjectX

projectx.cloud

Confident AI logo

Confident AI

confident-ai.com

Emdash logo

Emdash

emdash.sh

StableBrowse logo

StableBrowse

stablebrowse.ai

Butter - Quick Facts

Who are Butter's competitors?

Companies similar to Butter include Modal Labs, E2B, Runlayer and Blaxel.

When was Butter founded?

Butter was founded in 2024.

Where is Butter's headquarters located?

Butter's headquarters is located in San Francisco, CA, US.

Butter - Classification

Industry
  • AI Infrastructure
Ownership
  • Acquired
Technology
  • AI
Geographic Exposure
  • Americas
Model
  • Open Source
Revenue
  • Open Source
Customer
  • Developers
Tags
  • AI