Neither do you want to waste months (or years!) putting too much into the first version. You don’t want to err on the side of leaving too much out that’s how you build “minimum viable crap”-barely functional technology that doesn’t deliver value to customers. The other half of the challenge is finding balance. You might think you can easily answer these questions with a “yes” or “no”, but half of the challenge is thinking through these scenarios before you start development.
Should you turn off an account after one missed payment or give them a grace period?. Who can invite new people to a given room?. Can some people see comments but not post any messages?. How do you control who accesses a room?. Do you want users to communicate directly with each other?. 
Do you want the sender to receive read receipts?. Do you want to notify everyone when a new message is posted to a room?. Either way, it really doesn’t seem all that complicated. Maybe even rooms that contain users and messages. You might envision a data model made up of users and messages. Instant messaging seems relatively straightforward: A bunch of people can send messages to each other. Messaging app planning costs (or debts, your choice!) Hidden costs : important expenses that are hard to quantify. Maintenance costs : apps aren’t something you can “set and forget”. Fixed costs : what goes into creating a Slack MVP. Planning costs : determining what to build first. Turns out, developing apps is much more complicated than it looks on the surface.īelow, we break out four costs you’d want to consider in building a messaging app: Ok, well, there are a few minor footnotes: Slack did raise $16 million, the internal tool Slack was based on already existed, and there was probably some luck involved with its meteoric growth.īut the question remains: Could you build Slack from idea to launched product with $100,000? If not, how much would it cost? How hard is it to build messaging app anyhow? The business communication app quickly took off and reached a $1 billion valuation in just over a year-making it the fastest company ever to achieve “unicorn” status. 
After they closed shop in December 2012, a subset of the team built out Slack into a standalone product and launched it just nine months later. Slack was initially built as an internal tool for video game developers. Could $100,000 and the right developer(s) be your path into the billionaire club?
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