You know how to build an app from scratch. It's time to use your skills for a paying client. Imagine this: a local fitness studio asks you to create an app for their members. Class bookings, schedules, trainer profiles. In this lesson, you'll design a polished, user-friendly app for a client — and learn the UX principles that make any app feel professional.

FitBase is a small fitness studio offering group classes — yoga, strength, and cycling. They want an app where members can browse the schedule, book classes, track attendance, and see trainer profiles. Right now, everything runs through Instagram DMs and a shared Google Calendar. They need something better.

Before you open Bolt.new, define what the app needs. The process is the same as BrightMinds, but the product is different.

You've got a clear blueprint: screens, actions, and data. Let's turn it into a working app. Open Bolt.new and use the structure ChatGPT defined as the foundation for your first prompt.

You have a working draft. To implement changes wisely, walk through it as a member would. A UX audit means testing the flow and noting where things feel confusing, slow, or unclear.

The audit provided you with a prioritized list. Start with the issue that was flagged first and affects the most users — onboarding.

New members now get a clear introduction before they see the schedule.

Let's focus on the navigation flow. Not every screen belongs in the bottom navigation. Primary screens — the ones members use every session — get a tab. Secondary screens are reached from inside primary ones.

Another important point from your audit: no booking micro-interaction. When a member taps "Book" and nothing visible happens, they'll tap again — and accidentally double-book. Micro-interactions are small visual responses that tell the user "it worked."

That confirmation card from the micro-interactions prompt is doing an important job. It's solving the audit issue — members now know their booking worked. A good confirmation shows what was booked, when, and what to do next (like adding it to their calendar).

You've refined onboarding, micro-interactions, and confirmations. Now test the complete flow — focusing on how the app feels, not just whether it functions.

Open the preview on your phone and walk through these scenarios:

At each step, ask: Was the next action obvious? Did the app respond to your taps? Did anything feel confusing?

You've built and tested FitBase. Now it's time to hand it over. In Bolt.new, click Publish to deploy the app to a live URL — every project gets a free host address (e.g., fitbase.bolt.host). Share this link with the studio owner so they can see the live product.

Walk the client through how to use the product: checking bookings, viewing member accounts. For full handoffs, you can also push the project to GitHub (a website where people work together on code and other project files) so the client owns the code.

You've designed a polished, consistent app for a real client scenario — and the UX principles you practiced work for any app, including BrightMinds. In the next unit, you'll focus on the product launch and monetization of your websites and apps, including the implementation of AI-powered features for maximum efficiency. Let's keep going!