10 Innovative Products That Started as Side Projects
Some of the most groundbreaking products in history didn’t originate from well-funded corporate plans or strategic business moves. Instead, they were born out of curiosity, passion, and experimentation—side projects that transformed into global successes.
From billion-dollar companies to widely used digital tools, here are 10 innovative products that started as side projects and changed the world.
1. Gmail – Google’s 20% Rule Success
How It Started:
Google has long encouraged employees to spend 20% of their work time on side projects. In 2001, Paul Buchheit, a Google engineer, started working on an email platform to improve search and storage capacity.
The Breakthrough:
Buchheit built the first version of Gmail in one day using existing Google infrastructure. The project gained traction internally, and by 2004, it launched publicly with a revolutionary 1GB of free storage—a game-changer when competitors like Yahoo and Hotmail were offering just 2MB!
Today:
Gmail has over 1.8 billion users worldwide and remains one of Google’s most successful products.
2. Twitter – A Side Experiment at Odeo
How It Started:
In 2006, Odeo, a podcasting startup, faced an existential crisis when Apple introduced iTunes Podcasts. Employees were encouraged to explore new ideas.
Jack Dorsey, Biz Stone, and Noah Glass brainstormed a platform for sharing short status updates with friends via SMS.
The Breakthrough:
This side project, initially called Twttr, quickly gained internal popularity. Within months, Odeo rebranded around this new microblogging service.
Today:
Renamed Twitter, it became one of the world’s biggest social media platforms, playing a crucial role in news, politics, and entertainment.
3. Slack – A Gaming Company’s Communication Tool
How It Started:
In 2011, Stewart Butterfield and his team were developing an online game called Glitch. While working on it, they built an internal messaging tool to communicate effectively.
The Breakthrough:
Glitch failed, but the team realized their internal tool had immense potential as a standalone product. They pivoted, refined the tool, and launched Slack in 2013.
Today:
Slack revolutionized workplace communication and was acquired by Salesforce for $27.7 billion in 2021.
4. Instagram – From a Check-In App to a Photo Revolution
How It Started:
In 2010, Kevin Systrom was working on a side project called Burbn, a location-based check-in app with a photo-sharing feature.
The Breakthrough:
Users loved the photo-sharing aspect more than check-ins. Systrom and Mike Krieger stripped away unnecessary features and rebranded it as Instagram, focusing solely on photo sharing and filters.
Today:
Instagram became a global social media giant, acquired by Facebook (now Meta) for $1 billion in 2012.
5. Craigslist – A Hobby Turned Classified Empire
How It Started:
In 1995, Craig Newmark started an email list for sharing local events with friends in San Francisco.
The Breakthrough:
The mailing list evolved into an online classified site, allowing users to post jobs, rentals, and personal ads. Demand exploded organically.
Today:
Craigslist remains a dominant player in online classifieds, generating millions in annual revenue without flashy ads or aggressive monetization.
6. YouTube – A Dating Site Gone Viral
How It Started:
In 2005, three former PayPal employees—Chad Hurley, Steve Chen, and Jawed Karim—built a video-sharing platform intended for online dating video profiles.
The Breakthrough:
When the dating concept flopped, they opened YouTube for all types of videos. The platform’s user-generated content took off, attracting millions of users.
Today:
YouTube is the second-largest search engine and was acquired by Google for $1.65 billion in 2006.
7. Shopify – A Snowboarding Side Hustle
How It Started:
In 2004, Tobi Lütke and Scott Lake wanted to launch an online snowboard store. Frustrated by the lack of good e-commerce platforms, they built their own.
The Breakthrough:
They quickly realized their e-commerce software had more potential than selling snowboards. They pivoted, launching Shopify as an easy-to-use online store builder.
Today:
Shopify is now a leading e-commerce platform with over 4.5 million online stores using it worldwide.
8. Pinterest – A Hobby Board Turned Social Network
How It Started:
In 2010, Ben Silbermann and his team built Tote, a mobile shopping app. However, users were more interested in saving and sharing collections of products.
The Breakthrough:
The team pivoted and launched Pinterest, allowing users to create virtual pinboards for inspiration, DIY projects, and lifestyle ideas.
Today:
Pinterest has over 450 million active users, making it one of the most visually-driven social media platforms.
9. Trello – A Hackathon Innovation
How It Started:
In 2011, during an internal hackathon at Fog Creek Software, a team built a simple visual task management tool to improve workflow.
The Breakthrough:
What started as a small productivity experiment became Trello, a widely popular kanban-style project management tool.
Today:
Trello has millions of users and was acquired by Atlassian for $425 million in 2017.
10. Airbnb – Solving a Personal Rent Problem
How It Started:
In 2007, Brian Chesky and Joe Gebbia couldn’t afford rent in San Francisco. To make extra money, they rented out an air mattress in their apartment to visitors.
The Breakthrough:
Realizing the potential for short-term rentals, they built Airbnb, allowing homeowners to rent spare rooms to travelers.
Today:
Airbnb is valued at over $80 billion and has revolutionized the hospitality industry.
Final Thoughts: Small Ideas Can Lead to Big Success
These 10 incredible products prove that game-changing innovations often start as simple, passion-driven side projects. Whether it's solving a personal problem, experimenting with technology, or repurposing existing tools, the next big thing might just come from an unexpected place.
So, if you have a side project you’re passionate about—keep going! Who knows? It might just be the next global phenomenon.
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