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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