Appex · Mobile health and fitness · 2024 to 2025

One design team, ten apps, five million people

Appex acquires and grows subscription apps. As Lead UX, I set the design direction for a portfolio of 10+ health, fitness and productivity apps, managed a team of three designers, and ran the testing that lifted onboarding completion by 18% and paywall conversion by 12%.

Project facts

Role
Lead UX Designer, managing 3 designers
Company
Appex, Boston (remote)
Portfolio
10+ iOS and Android apps, including Fitness AI, Fithub and Sculpt You
Partners
Growth, Product and Engineering
Timeline
April 2024 to November 2025

Results

  • +18%onboarding completion
  • +12%paywall conversion
  • −30%design-to-development handoff time
  • 5M+combined active users across the portfolio
Before and after of the Sculpt You home screen. The old version is dark and text-heavy. The new version shows today's workout with a photo, a journaling prompt and nutrition content, with a list of what the new home lets users do.
Sculpt You home screen, old and new. Open full-size image of the Sculpt You before and after

How we worked across the portfolio

Most apps in the portfolio shared the same funnel: a user installs, goes through onboarding, meets a paywall and either subscribes or leaves. That shared funnel let a small team have a big effect, because a lesson learned in one app could be tested in the next.

  • Shared standards and a design system. I introduced usability standards and a cross-app design system. Handoff from design to development got 30% faster.
  • Fast test loops. With Growth, Product and Engineering, we ran A/B tests and quick qualitative sessions on onboarding and paywalls, then reused what worked across apps.
  • A team built around experimentation. I managed and mentored three designers, building a culture of experimentation and data-informed design.

Across the portfolio, this raised onboarding completion by 18% and paywall conversion by 12%, and improved App Store ratings on several apps.

Fitness AI: showing value in the first minute

New users did not understand what made the app different, so many left during onboarding. Frequent actions also took too many taps.

  • Onboarding redesigned to show personalization and the user's goal up front, before asking for commitment.
  • A bottom navigation bar for faster access to Workout, Challenges, BodyScan and Planning.
  • BodyScan, a new feature for tracking progress visually, with body fat, lean mass and BMI estimates.
Fitness AI: the new BodyScan feature and the workout screen with bottom navigation.

Fithub: a reason to open the app every day

Fithub users logged workouts, but that alone did not build a daily habit. We extended the app into everyday health behaviors, which created more natural reasons to return.

  • Onboarding that connects each user's goal to the features that support it.
  • Fasting and water intake tracking, added to a redesigned daily dashboard.
  • A progress tab with clear weekly charts.
Five Fithub screens showing the daily dashboard with progress rings, a water tracking card, recipe suggestions, and a flow for logging water intake.
Fithub dashboard with the new water tracking flow. Open full-size image of the Fithub dashboard

Sculpt You: one home for fitness, food and wellbeing

Sculpt You had workouts, nutrition and wellness content, but they lived in separate places. The redesign brought them together.

  • A new home screen where users see today's workout, swap it for another, and get an overview of meals, programs and on-demand workouts.
  • Visual tags that make workouts and programs easier to scan and find.
  • A better in-workout experience, with exercise previews.
  • Accessibility improvements for a wider range of users.

Reflection

Leading design for a portfolio is different from leading one product. The most valuable thing I built was not a screen but a way of working: shared patterns, shared metrics and a team that treated every release as an experiment.

Contact

Hiring a Lead UX Designer? Let's talk.

I'm open to Lead and Principal UX roles, remote or based in Bucharest. The quickest way to reach me is email.