Gmail API Startups

Leave Me Alone is a privacy-first email unsubscribe service founded by Danielle Johnson and James in November 2018. After validating the idea with a landing page that attracted 50 beta users in hours, they built an MVP in 7 days and launched on Product Hunt in January 2019, reaching #1 product of the day. By focusing on community engagement, transparent communication about their journey, and charging from day one ($3-$8 per scan), they grew to $1,700 MRR within months, with a major boost from a Lifehacker feature and subsequent Product Hunt 2.0 launch.

Streak is a Chrome extension that integrates CRM functionality directly into Gmail, allowing users to manage sales and business workflows without leaving their inbox. Founded by Aleem Mawani in 2012 after pivoting from a failed loyalty rewards startup during Y Combinator, Streak grew profitably through word-of-mouth adoption by YC founders and early users who discovered it on the Chrome Web Store. By 2020, the company had reached millions in annual revenue with 30 employees, choosing to remain bootstrapped and profitable rather than pursuing venture funding.

Tiny is a holding company founded by serial entrepreneur Andrew Wilkinson that has grown to ~$300M in revenue by acquiring and holding profitable businesses long-term, inspired by Warren Buffett's philosophy. Rather than starting companies, Wilkinson learned to buy established businesses with strong moats (network effects, brand loyalty) and leave them largely unchanged. The company owns 40+ businesses including Dribbble, Letterboxd, Serato, and Aeropress, demonstrating that bootstrap companies can scale massively without VC funding.

Badis Kalfalahi launched LeadGuru.io in September 2016 as a side hustle while attending Achèse Paris business school, building a service that outsources cold-email campaigns for B2B companies. The company reached $19,000 MRR with 24 customers paying an average of $800/month through a subscription model, generating approximately $45,000 in revenue over eight months. After his CTO departed, Badis pivoted to partnering with Reply.io instead of building proprietary tech, focusing on the service and sales aspects of the business.