7 projects that hit $1M ARR with $0 ad spend in a short time

1. Mathos AI
AI study assistant, grew very fast.

• What: AI tool that helps students solve and learn math.
• Who: Founded by YJ Guo, indie hacker vibe.
• Growth: Reached millions of students with no reported ad budget, driven by product usage and word of mouth.

2. Mixo
Weekend project that became a 1M ARR AI landing page builder.

• What: AI that creates full startup landing pages from one sentence.
• Who: Solo founder, Sina Kahen.
• Growth: MVP in a weekend, then scaled using Product Hunt, Twitter, Reddit and viral “powered by Mixo” pages, not paid ads.

3. lemlist
Bootstrapped cold email SaaS.

• What: Sales engagement and cold email outreach platform.
• Who: Guillaume Moubeche and a small team, started with a very scrappy style.
• Growth: Went from 0 to about 1M ARR in under 2 years using cold email, content and community, not ad spend.

4. Baremetrics
Stripe analytics side project that turned into a 1M ARR tool.

• What: Subscription analytics dashboard for Stripe and other billing tools.
• Who: Built by developer and designer Josh Pigford.
• Growth: MVP coded in about a week, then grew mostly from one tweet, public revenue dashboard and “open startup” content, not a big marketing budget.

5. Plausible Analytics
Privacy focused analytics that grew with content only.

• What: Simple, privacy friendly Google Analytics alternative.
• Who: Small indie team, originally two developers.
• Growth: Hit around 1M ARR fully bootstrapped using blog posts, open source and transparent “open startup” reports, no paid ads.

6. Carrd
One person, incredibly simple site builder.

• What: Tool to build simple one page sites used by millions.
• Who: Solo developer known as AJ.
• Growth: Bootstrapped, almost all word of mouth, templates and integrations instead of classic ad spend.

7. ProjectionLab
Solo B2C finance simulator.

• What: Modern personal finance and retirement planning simulator.
• Who: Solo engineer, Kyle Nolan.
• Growth: Reached around 1M ARR over a few years through communities, Product Hunt and word of mouth, not big paid campaigns.

I also put all these projects in one playlist so you can open every site from a single link: https://clipnotebook.com/p/26250431-a8fb-4774-b63c-045d0bf829c3