--- title: "Let it Go: App Brand & UI Design | Mattriz Studio" description: "Let It Go, a mobile app that aims to change consumer habits: swap and sell the clothes and books you no longer use. Brand and UI design by Mattriz Studio." lang: en url: https://mattriz.com/project/let-it-go/ --- > Let It Go, a mobile app that aims to change consumer habits: swap and sell the clothes and books you no longer use. Brand and UI design by Mattriz Studio. Case study # Let it Go Let It Go, a mobile app that aims to change consumer habits so people swap and sell the clothes and books they no longer use. [See the prototype](https://xd.adobe.com/view/11bab7f6-7c9b-451e-4b3d-4898d7a55edf-678b/?fullscreen&hints=off) ## At a glance - **Client**: Let it Go - **Services**: Brand Identity, UI/UX Design ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/mockup3-scaled-1600.webp) Project overview This project was born from an effort to contribute to sustainability and the environment through a circular economy. It starts from the idea of seeing the clothes and books we no longer use not as waste, but as a resource that someone else can swap and reuse. [View prototype](https://xd.adobe.com/view/11bab7f6-7c9b-451e-4b3d-4898d7a55edf-678b/?fullscreen&hints=off) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2022-12-14-a-las-12-56-13-p-m-931.webp) ![Let it go app UI/UX design](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2025-03-11-a-las-11-29-56-p-m-1394.webp) ![Let it go app UI/UX](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2025-03-11-a-las-11-30-57-p-m-1396.webp) ![Let it go app UI/UX](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2025-03-11-a-las-11-31-47-p-m-1395.webp) ![Let it go app UI/UX](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2025-03-11-a-las-11-32-52-p-m-1392.webp) ![Let it go app UI/UX](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2022-12-14-a-las-10-20-08-a-m-1251.webp) ![Let it go app UI/UX](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2025-03-11-a-las-11-34-10-p-m-1396.webp) What we did 1. Research on the environmental problem 2. Framing the design problem 3. Defining the app’s goals 4. Defining the target audience 5. Benchmarking 6. Logo and visual identity 7. App sketches 8. UI/UX design 9. Prototype 10. User testing ![Let it go app UI/UX](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2022-12-14-a-las-10-17-06-a-m-1252.webp) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2022-12-14-a-las-10-02-53-a-m-1250.webp) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2022-12-14-a-las-10-03-22-a-m-1251.webp) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2022-12-14-a-las-10-16-29-a-m-1251.webp) ![Let it go app UI/UX](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2025-03-11-a-las-11-35-45-p-m-1396.webp) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2022-12-14-a-las-10-26-24-a-m-1-1251.webp) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2022-12-15-a-las-7-24-18-p-m-494.webp) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2022-12-14-a-las-11-24-02-a-m-530.webp) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/captura-de-pantalla-2022-12-15-a-las-7-14-02-p-m-500.webp) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/mockup1-scaled-1600.webp) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/pantallas-scaled-1600.webp) ![Let it Go: project work](https://mattriz.com/media/projects/let-it-go/gifintro-1400.webp) ## Got a project in mind? We design and build websites, online stores and booking and payment systems, and keep them running every month. [Tell us about your project](https://mattriz.com/contact/) [See the prototype xd.adobe.com](https://xd.adobe.com/view/11bab7f6-7c9b-451e-4b3d-4898d7a55edf-678b/?fullscreen&hints=off) --- ## About Mattriz Mattriz is a design and development studio based in Bogotá, Colombia, working with businesses across the US and Latin America. We design the brand, build the website, the online store or the booking and payment system, and keep it running every month. AI speeds up the work; the decisions stay with us. - What we build: booking and operations systems, payment integration (Square, Stripe, Wompi), custom admin dashboards, automation and follow-up, websites that convert. - How we work: a monthly plan to build, maintain and keep improving. No one-off projects. - Capacity: three active clients at a time, a deliberate limit. - Languages: English and Spanish. - Contact: contacto@mattriz.com · https://mattriz.com/contact/ - Book a free 30-minute call: https://calendly.com/contacto-mattriz/30min - Free website scanner: https://mattriz.com/scan/ - Everything about the studio for AI assistants: https://mattriz.com/llms.txt