Meet Billy

The app that makes co-living easy.

Designed for those living with roommates, partners or family members, Billy is a household management tool that solves your co-living headaches. While most people have systems in place to manage their schedules and tasks in the office, their personal lives often lag far behind in productivity and organization. Billy ensures that you will cohabitate in domestic bliss, from ensuring that each roommate pays rent on time to dividing all of the household chores, like cleaning the litter box.


Matt Donovan [UX Lead at Zaarly]


Montse Diaz


November 2018

The Problem

The Co-living Nightmare

We all hear complaints from our friends, colleagues and family members about the challenges of living with another person (or multiple in some cases). If you plan to live with a stranger, you can find yourself on a never-ending hunt to find one that fits your lifestyle and preferences. If you live with a partner, spouse, or a friend, there is always the possibility of affecting your relationship due to arguments over money and chores.

The Result

What makes Billy different?

With a simple interface and multiple integrations, Billy helps you organize your chores and makes sure your roommates (or partner) remember to pay their rent on time. With user-friendly and fully customizable tools allow the user to personalize their solutions like creating house rules, compiling shopping lists, and requesting help with household chores.

User Research

Results: Customer Profile

  • 31% of those surveyed live with one or more roommates.
  • 41% of those surveyed live with a family member.
  • 27% of those surveyed live with a partner. 45% of those surveyed with roommates share their household with more than two people.
  • 24% of those surveyed said that this was their first experience with roommates. The average time each user has lived with the same roommate is between one or two years.
  • The average time each user has lived with a partner or spouse is between three and seven years.

User Research

Results: Key Facts

  • 60% of those surveyed use a digital medium such as Venmo, Chase QuickPay, Cash App, Zelle, or PayPal to pay rent to the leaseholder.
  • 62% of those surveyed divide tasks and chores around the house in a semi-formal way (chalkboard, calendar, Google Sheets, etc.)
  • The other 34% divide them randomly.
  • 15% of those surveyed outsource household help using apps like Zaarly, TaskRabbit, Craigslist, or Amazon.
  • 94% of those surveyed expressed dissatisfaction with their current organization of their household.

About the Branding

The Name

The name Billy comes, simply, from the word “bills”. Nobody likes bills, but we’ve all got ‘em. After research with potential users, it was discovered that one of the most common activity among roommates is splitting bills.

The Mascot

Beavers live in colonies, and if anything can be learned from the animal kingdom, it’s organization and co-living. Beavers not only are incredibly tidy with their lodges, but they are masters of home-creation. They are also social animals that are experts of communication. Finally, beavers are second only to humans in their ability to manipulate and change their environment.

Learn from the beavers, create a happy colony.

If you're interested in investing in Billy, please contact me at

Copyright © 2018 Montse Diaz. All rights reserved. These images may not be downloaded, copied, linked to, or edited in any manner or form for use on any website, image gallery, clipart collection, printed product, or other derivative uses without express written permission from the artist.