StackBlitz

Creator of Bolt.new, a browser-based AI development platform that lets non-technical users spin up full-stack web apps with natural language, integrated Supabase storage, and instant Netlify deployment. Finalized $700M valuation round in early 2025; $40M ARR by April 2025; Bolt.new is a leading 'vibe coding' tool; integrates directly with Supabase and Netlify for the full build-deploy loop.

Bolt.new reached $40M ARR with only 35 employees, demonstrating the explosive demand for AI tools that collapse the gap from idea to deployed application for non-developers.

bolt.new AI IDEs and Editors

United Statesprivate

At a glance

Total raised

$135.4M

last round series b

Headcount

11-50

approximate · public range

Headquarters

San Francisco

United States

Founded

2017

9 years active

Status

Private

AI IDEs and Editors

Latest valuation

$700M

Series B · 2025

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Funding history

Total raised

$135.4M

Rounds tracked

Latest stage

Series B

Latest valuation

$700M

Date	Stage	Amount	Valuation	Lead investors
Jan 23, 2025	Series B	$105.5M	$700M	Emergence Capital, GV
Apr 6, 2022	Seed	$7.9M	—	Greylock

Founder backgrounds

Albert Pai

Co-founder & CTO

Co-founded StackBlitz in 2017 alongside childhood friend Eric Simons after the pair previously built Thinkster (thinkster.io), a platform teaching JavaScript frameworks, which was acquired in December 2018. Pai studied Computer Engineering at the University of Illinois Chicago and earlier worked as a computer programming aide at the University of Illinois Urbana-Champaign. The company spent years as a browser-based IDE before a near-death experience—detailed in a 2025 Business Insider feature—led to a pivot that produced Bolt.new, an AI-powered development platform that became one of the fastest-growing products in the space.

Eric Simons

Co-founder & CEO

Co-founded StackBlitz in 2017 with childhood friend Albert Pai. Previously founded the ed-tech startup Thinkster (CEO/Co-founder), and earlier built Claco—an ed-tech tool developed at age 21 while sleeping on a couch at AOL's headquarters. StackBlitz spent six years building WebContainer, a browser-based operating system, but by 2023 the company was near failure. In October 2024, the team launched Bolt, an AI coding agent that lets anyone build full-stack apps from natural language prompts. Bolt hit $40M ARR and 3 million registered users in roughly five months with a team of about 15–20 people—one of the fastest product ramps in recent history. Simons is defined by extreme endurance: he lived in frat houses for $100/month during earlier failed startups and nearly shut down StackBlitz entirely before Bolt's breakout.

AI bull / bear

Bull case

StackBlitz's Bolt.new has achieved what few SaaS companies ever do: $40M ARR with only 35 employees, translating to over $1.1M in revenue per head. That capital efficiency signals genuine product-market fit, not growth bought with ad spend. Bolt.new rides a structural shift — "vibe coding" — where non-technical founders, PMs, and designers bypass engineering queues entirely. The platform's tight integration with Supabase for persistence and Netlify for one-click deployment creates a full build-deploy loop that competitors like Cursor and Replit have not matched with the same seamlessness. Emergence Capital and GV backing a $106M Series B at a $700M valuation shows institutional conviction that AI-native development platforms expand the market beyond the 30 million professional developers globally. If Bolt.new captures even a fraction of the hundreds of millions of knowledge workers who understand logic but never learned syntax, the addressable market dwarfs traditional IDE economics. With a browser-first architecture, onboarding is near-zero, and every deployment on Netlify embeds StackBlitz deeper into a user's workflow.

Bear case

A $700M valuation on $40M ARR is a 17.5x multiple, pricing in years of hypergrowth that may not materialize once the novelty of "vibe coding" fades. The core risk is that natural-language app generation produces plausible-looking software that fails at the edges — security holes, broken auth flows, unoptimized queries — leaving non-technical users with production incidents they cannot diagnose or fix. When the prototype thrill wears off and real-world reliability demands emerge, churn could accelerate. Competition is intensifying fast: Cursor has captured the professional developer mindshare, Replit is pushing its own AI agent, and GitHub Copilot sits inside the platform where most code already lives. Big cloud vendors can bundle equivalent capabilities at zero marginal cost. StackBlitz's browser-only architecture also imposes hard ceilings on complexity; enterprise workloads requiring microservices orchestration, custom CI/CD, or compliance controls remain out of reach. The $106M capital raise, despite only 35 employees, implies heavy inference and hosting costs that may grow faster than revenue as usage scales.

Generated by deepseek-v4-pro · May 2, 2026Refreshes quarterly · see disclosures

In the news

StackBlitz · last 30 days

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Leadership

Eric Simons

Co-founder & CEO

—

Albert Pai

Co-founder & CTO

Products

Bolt.new
Bolt.new is an AI-powered web development agent that lets anyone build, run, edit, and deploy full-stack web applications directly from the browser using natural language prompts. Built on StackBlitz's WebContainers technology, it integrates AI models to generate complete codebases, features a real-time live preview, built-in terminal and package manager, and offers one-click deployment to Netlify. It supports modern stacks including React, Node.js, and databases like Supabase, enabling rapid prototyping and production-level app creation without any local setup.
WebContainers
WebContainers is a browser-based operating system developed by StackBlitz that runs Node.js natively inside the browser. It eliminates the need for local development environments by providing a fully functional server-side runtime, package manager, and filesystem within a browser tab. WebContainers underpins both the StackBlitz IDE and Bolt.new, enabling instant dev environments, real-time collaboration, and secure sandboxed execution. It is open-source and available via webcontainers.io, allowing developers to embed interactive coding experiences anywhere.
StackBlitz (Online IDE)
StackBlitz is a browser-based integrated development environment (IDE) that allows developers to instantly spin up full-stack web projects without installing anything locally. Powered by WebContainers, it supports popular frameworks like React, Angular, Vue, Next.js, and Node.js, and offers features like live reload, terminal access, package management, and GitHub integration. It is widely used for rapid prototyping, code sharing, tutorials, and collaborative development, serving over 1 million developers worldwide.

Most recent patents

StackBlitz, Inc.·2025-10-28
Improved Network Browser Engine
US12457261
Abstract
Improved Network Browser Engine
US12457261
Abstract An improved computing system is arranged for cross-origin network communications on a single computing device. The system includes a processor, a networking module, and memory with software instructions arranged to operate a local computing server resource on a first local domain, instantiate a relay mechanism that has an iFrame and an invisible window, instantiate a local web server on a second local domain, install a service worker on the invisible window, receive a request for information at the local web server, verify a presence of the local computing server resource on the first local domain, communicatively connect the second local domain to the iFrame, and directly communicate, via the at least one networking module, at least one message between the local computing server resource on the first local domain and the local web server on the second local domain using the relay mechanism.
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