WeFast

WeFast — Fasting Tracker App

UX/UI | Mobile App | 2021 – 2022

Background

WeFast is an intermittent fasting tracker app for iOS that helps users build consistent fasting habits. I designed the app from 0 to 1 as the sole product designer, covering everything from brand identity to core interaction design.

Intermittent fasting was a rapidly growing category in 2021. The challenge was to stand out in a crowded market by offering a more social, motivating, and visually satisfying experience than existing apps.

The Problem: Fasting Apps Were Clinical, Not Motivating

The leading fasting apps — Zero, Fastic, Life Fasting — were functional but felt cold and transactional. They displayed timers and stats without creating any sense of community or personal investment. Users struggled to stick with their fasting goals beyond the first two weeks.

Fasting is a habit built on consistency. The app needed to make every completed fast feel like a win.

What Made WeFast Different

  • Social fasting: fast together with friends or a community
  • Streak celebrations with delightful micro-animations
  • Health insights that explained the science behind each fasting phase
  • Customisable fasting schedules (16:8, 18:6, 24h, custom)
  • Integration with Apple Health for accurate tracking
WeFast app cover

My Design Process

1
Competitive Audit & User Research
Analysed 8 fasting apps in depth. Ran a survey with 150 people who had tried intermittent fasting — asking what made them quit and what would have kept them going.
2
Brand & Visual Direction
Created the WeFast visual identity from scratch. The design language was built around calm blues and clean whitespace — evoking clarity, discipline, and lightness — with warm accent moments for celebration states.
3
Core Timer Experience
Designed the main fasting timer as a radial progress ring — satisfying to watch fill as a fast progresses. Added phase markers showing when the body enters fat burning, ketosis, and autophagy states.
4
Social Features
Designed the group fasting feature: create or join a fast, see friends' progress in real time, send encouragement reactions. This became the app's most distinctive feature.
5
Onboarding
Built a personalised onboarding that set up the user's first fast within 60 seconds — asking only for fasting goal, schedule preference, and name. No account creation required on day one.
WeFast App Store screenshots
WeFast App Store screenshots
WeFast fasting ring design review
WeFast A/B test 1
A/B test variant 1
WeFast A/B test 2
A/B test variant 2
WeFast ARR growth
ARR growth chart
WeFast record
WeFast user testimonial 1
WeFast user testimonial 2

Results

7-fig
ARR within the first year
4.6★
App Store rating
+200K
Downloads in first 6 months

WeFast achieved seven figures in ARR in its first year, driven by strong organic growth and positive App Store reviews. The social fasting feature proved to be a powerful retention driver — users who fasted with at least one friend showed 2× the 30-day retention of solo users.

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