If you want to see app virality up close, sign up for Trello and Asana and pay attention to what each product asks you to do next. Both grew to millions of users on the same insight: the fastest way to grow is to make the product spread by itself, from one person to a whole company, with almost no marketing in between.
These two apps are built for virality because they are most useful when teams collaborate around them. A task board is boring alone and powerful shared, so their product teams put the real effort into getting each new user to pull the rest of their organization in. Here is how that works, and why the same playbook still drives product-led growth today.
Trello and Asana use Yammer’s playbook
The pattern is older than either app. Yammer ran it in 2010, growing from roughly one million to five million users in two years by making the product spread inside companies instead of selling it to them. Reporter Jennifer Van Grove described the mechanics at the time:
“Yammer is designed in such a way that anyone can sign up for the basic service with their work e-mail, no fees or strings attached. The free plan includes just the basics, so should the new user then want to introduce a more robust experience to their business peers, he will need to upgrade to either the three or five dollar per user per month paid plans.” [emphasis added]
That is a freemium model aimed squarely at company-wide adoption. Yammer proved the model worked: Microsoft acquired it in 2012 for about $1.2 billion, and the product lives on today rebranded as Microsoft Viva Engage. The tactic outlasted the brand.
Freemium is still the default entry point across project management and collaboration software, and it is easy to see why. Tools like these need more than one person to be useful, so a free plan is really a way of reducing friction and letting the app propagate across an organization before anyone is asked to pay.
Below is how two of the biggest project management apps, Trello and Asana, build freemium products around that idea, and the different tactics they use to spread from individual, to team, to organization. The virality hacks that carried both to millions of users come down to a single principle applied two very different ways.
Asana grows your team first, then pushes for conversion
Asana’s approach is direct: get the whole team inside the product as fast as possible, then let team size do the selling.
Work email signup is highly recommended
To keep product adoption as frictionless as possible, Asana ties your account to your work email’s domain, so anyone with the same domain (for example, ben@process.st) can join without an admin wiring the organization together first.
Try to sign up with a personal address instead and Asana pushes back, hard. Every copywriting lever is in play:
- Call to action: use your work email address.
- Benefit: auto-connect with the other people at your company.
- Reassurance: it tells you exactly why it is asking, with a reason that lands.
- Prominent button versus hidden link: the work-email path is the big obvious button; the personal-email escape hatch is a small link in the corner.
The reasoning is simple, and it comes straight from social-network growth history. Chamath Palihapitiya famously put Facebook on the path to a billion users after his team found that power users shared one trait: they reached seven friends in ten days. That became Facebook’s Aha moment. Asana works best, or at all, with a team, so its obvious Aha moment is inviting your coworkers into a shared project. Of course the app pushes you down that path.
Onboarding reminds you the app is no good alone
The first thing Asana has you do is add your team. Then it walks you through creating a project, adding a task, and assigning your team. Empty portraits sit in the sidebar like un-ticked checkboxes, quietly asking to be filled.
Adding your team does two jobs at once. It fixes user onboarding (one person opting out will not sink a team of twenty, but a team of one is total abandonment), and it moves the account toward the free plan’s seat ceiling. Asana’s free tier, now called the Personal plan, is deliberately small, so a growing team runs into the limit quickly.
Team growth has to lead to conversion
One Asana account is meant to hold a whole company. Because the free Personal plan caps seats, any organization worth converting, meaning a large one, eventually has to pay once the app gains internal traction. Private teams and projects live only on the paid tiers, so the moment a second team joins and needs a wall between its work and the marketing team’s work, someone upgrades. Free-for-all visibility stops being acceptable, and conversion follows the org chart. It is a strategy that has scaled: Asana went public in a 2020 direct listing on the NYSE, still running the same viral-then-convert engine that its everyday Asana workflows are built around.
Trello uses a subtler approach to virality
Trello CEO Michael Pryor once explained the company’s spread with almost nothing about conversion optimization. For him it came down to the product itself:
“Trello spreads quickly throughout an organization because it has a universal appeal. It maps to the way people work and think in the real world (whiteboards, sticky notes). Once people see how effectively and quickly it puts teams on the same page, Trello quickly becomes the default status report for the entire company.” — Michael Pryor
Trello was free for its first few years. Since its creation in 2011 it prioritized ramping up the user base over revenue, on the theory that a huge free base would convert better later. Creator Joel Spolsky put it plainly back then:
“The business goal for Trello is to ultimately get to 100 million users. That means that our highest priority is removing any obstacles to adoption. Anything that people might use as a reason not to use Trello has to be found and eliminated.” — Joel Spolsky
That patience was funded by Fog Creek Software, the studio Spolsky and Pryor founded in 2000 (later renamed Glitch), which let the early Trello team chase free users without pressure to monetize. Trello was spun out as its own company and acquired by Atlassian in 2017. The 100-million-user flag is still a stretch goal, but the growth engine did its job: get large numbers of people using the product, then, as Spolsky said, extract small amounts of money from large numbers of them.
Trying to get Trello to ask for money
Trello’s conversion prompts are subtle enough that you can use the app for a long time without hitting a restriction or even a reason to upgrade. The landing page has one job: get you into an account with minimal distraction, no pricing tour up front. Trello wants you to fall for the product before money enters the picture, so a new user often has no idea a paid plan exists.
It also removes friction from inviting people. There is no cap on how many users can be in your organization, and you can pull people in with a shareable link, so if you do not have someone’s email you can just drop the link in chat. Throughout the onboarding, which happens by using Trello rather than reading a manual, paid features barely surface. Users neither know why they would upgrade nor that they can.
Referrals and the real premium plan
Trello’s original virality lever was a referral program: invite more people and earn aesthetic upgrades, more space for attachments, and small perks like custom backgrounds and stickers to cover your cards, a way of applying perceived value more than an upsell anyone expected you to buy outright. The real revenue came from its premium tier, where Trello makes its money by incentivising referrals and converting a smaller percentage of power users. By spreading through organizations on product merit and rewarding referrals, Trello grew a large free base and converted a smaller slice of power users into paying teams.
The plan names have since changed under Atlassian: the old “Gold” perk program was retired in 2021, “Business Class” became the tier now called Premium, and Trello today runs on Free, Standard, Premium, and Enterprise. The mechanic underneath is the same. Premium features target power users who want deeper integrations and controls to work more effectively with their team, and the first conversion nudge still frames it as pay-or-refer, which for a new user makes referring the easy choice.
When Trello users convert
The elegant part is that upgrading happens per team, not per user. Trello ingrains itself first, offers improvements quietly, and only then asks you to upgrade a whole team so those improvements are useful, without ever making you feel like you are about to get squeezed the moment you want something more powerful.
A lift in adoption is a lift in conversions and virality
Both apps are designed for teams, and that is the whole point: the more team members use the product, the more likely a power user in the group starts pushing for conversion.
- Asana pairs a free-seat cap with premium features that teams of any size eventually want.
- Trello leans on power-ups and advanced permissions, so as a team grows those capabilities become necessary rather than optional.
When conversion happens, it rarely happens one seat at a time. It happens on a whole-team basis, and then the pattern repeats: the HR team notices the tool Accounting is using, adopts it, and the cycle starts again.
There is a deeper lesson here for anyone building or running processes inside a company. The reason these tools spread is that a shared way of working is worth far more than an individual one, and adoption compounds when the work itself lives in the tool. That is exactly why teams standardize their operations in a platform like Process Street, where the day-to-day work runs on documented, repeatable workflows with built-in AI, and where the same viral logic applies: once one team runs its onboarding and recurring processes in one place, neighboring teams want in too. Process Street connects to more than 5,000 systems out of the box, and when a team needs an integration that does not exist yet, an AI agent builds it on the fly, so the tool spreads without waiting on IT.
The virality hacks Trello and Asana used are not tricks so much as a bet: build something a team genuinely wants to use together, remove every reason not to start, and let adoption pull conversion along behind it.