Inside Bolt: From near-death to one of the fastest-growing products in history | Eric Simons

Key Concepts

• ARR (Annual Recurring Revenue): A key metric for subscription-based businesses, representing the normalized revenue expected annually.
• WebContainer: StackBlitz's core technology, an operating system running inside a browser using WebAssembly, enabling fast and reliable development environments.
• AI Agent: The AI component of Bolt that interacts with the WebContainer to generate code and build applications based on user prompts.
• Text-to-App: A type of AI coding app that allows users to create applications by simply describing what they want in text.
• Full-Stack: Refers to the complete set of technologies needed to build a web application, including front-end, back-end, and database.
• Greenfield Project: A new project that lacks any prior work or constraints, allowing for maximum flexibility in technology choices.
• Deterministic: In the context of software, meaning that the same input will always produce the same output, making it easier to train AI models.
• Product Development Process: The complete process of identifying a market opportunity, designing a product, building it, and launching it to users.

1. Bolt: An Overview and Early Success

• Bolt is a text-to-app building tool that allows users to create full-stack web and mobile applications by simply prompting.
• The product launched after seven years of building the underlying WebContainer technology.
• Within the first two months of launching, Bolt achieved $20 million ARR, and within four months, it approached $40 million ARR.
• The company forecasts reaching $100 million ARR for the year.
• Bolt has acquired three million registered users in a few months, with approximately one million monthly active users.
• The company has a small team of 15-20 people, supporting nearly 100,000 customers.

2. Bolt Demo and Key Differentiators

• Bolt is accessible via bolt.new, featuring a simple text box interface.
• The primary differentiator is its speed and reliability, stemming from the WebContainer technology.
• Unlike other platforms that use cloud servers, Bolt runs an operating system locally in the browser, utilizing the user's CPU.
• Example: Prompting "Make a clone of Spotify" results in a functional application within 60 seconds.
• Bolt integrates with production-grade hosting providers like Netlify and database providers like Supabase for easy deployment.
• Users can deploy applications to a live URL and attach a custom domain.
• Bolt also supports building native mobile apps through a partnership with Expo, generating a QR code for real-time testing on mobile devices.

3. The WebContainer Foundation

• WebContainer is a browser-based operating system built on WebAssembly that can boot in under 100 milliseconds.
• The idea originated from observing Figma's browser-based deep technology play using WebGL.
• WebContainer leverages browser APIs like WebAssembly, shared memory, and service workers to run Node.js and NPM.
• This eliminates the need for cloud VMs, which are used by other Cloud IDEs and AI code tools.
• The browser-based compute model allows for a permissive free tier and avoids issues like Bitcoin mining and DDoS attacks.
• It took four to five years to build WebContainer, followed by struggles to find a viable product.

4. Lessons Learned and Counterintuitive Strategies

• StackBlitz initially built the technology (WebContainer) and then sought a problem to solve, which is contrary to conventional advice.
• The company maintained a low burn rate and took many shots on goal, bootstrapping for the first few years.
• During the exuberance of 2020-2021, StackBlitz remained conservative and avoided tripling headcount, which ultimately saved the company.
• The key is to "just don't die" and survive long enough to find something that works.
• The launch of Bolt was initiated with a single tweet.

5. Post-Launch Challenges and Adaptations

• The initial launch saw significant traction, with $60,000 ARR on the first day.
• The team had built Bolt in 90 days, resulting in missing features like mobile responsiveness.
• The initial pricing plan of $9 was quickly exhausted by users, leading to the introduction of new pricing tiers.
• Anthropic ran out of GPUs to support Bolt's inference needs.
• The team, despite being small, managed to handle customer support and scale the product.

6. Team Dynamics and Hiring Philosophy

• The core team has been together for five-plus years, which is rare in Silicon Valley.
• The company values high trust, agency, and low political overhead.
• They hire individuals who are motivated by working on cool things and are willing to check their ego at the door.
• Most hires come from the StackBlitz community.

7. Prioritization and Product Development Process

• The team meets every day via Zoom to discuss everything front to back.
• They use Linear for engineering tasks, Notion for product roadmapping and PRDs, and Figma for design.
• PRDs are kept light to ensure everyone is on the same page.
• Bolt is also used for design and prototyping.

8. Bolt Use Cases and Limitations

• Bolt can be used to build full-scale applications, especially for greenfield projects.
• Example: An entrepreneur built a CRM with AI and Stripe integration in three weeks for $300, compared to a $30,000 quote from an agency.
• Existing companies use Bolt for public websites and landing pages.
• Bolt can integrate with existing codebases, depending on the setup and application size.
• Limitations: Not ideal for very large existing codebases.
• Successful users, especially non-developers, are often skilled PMs who can define scope and debug issues.

9. The Future of Software Development and the Role of AI

• AI tools are changing the software world order, with PMs becoming more involved in "writing code."
• Org charts will likely shift, with fewer front-end engineers and more product and design folks.
• Skills to focus on: Understanding user needs, articulating problems, and growing products.
• Bolt Builders program: Certified experts help users get "unstuck" when the AI can't figure something out.
• Sonnet (Anthropic's model) was a key enabler for Bolt, demonstrating the potential of AI to write production-grade code.
• Software is deterministic, making it an ideal vertical for AI development.

10. Upcoming Features and the Future of Bolt

• Figma to full-stack app conversion: Users can paste a Figma URL into Bolt and generate a functional application.
• Slack integration: A Bolt Slack bot will act like a developer, allowing users to prompt for changes and generate code within Slack threads.
• The engineering team uses Cursor and Bolt to build Bolt.
• Tip for PMs using Bolt: Talk to it like you would a Linear or JIRA ticket, being specific and clear.

11. Conclusion

Bolt's rapid growth and innovative approach to software development highlight the transformative potential of AI in the industry. By leveraging WebContainer technology and focusing on user empowerment, StackBlitz is enabling a new generation of creators to build applications with unprecedented speed and ease. The future of software development will likely involve a closer collaboration between humans and AI, with product managers and designers playing a more active role in the coding process.