Trace

Trace

Mobile App, Sustainability, UI/UX

Mobile App, Sustainability, UI/UX

2025

2025

A mobile app concept helping young professionals understand and reduce their digital carbon footprint through small, guilt-free daily actions.

A full UX process from research and persona work through usability testing, iterations, and a tested high-fidelity prototype.

Trace

Mobile App, Sustainability, UI/UX

2025

A mobile app concept helping young professionals understand and reduce their digital carbon footprint through small, guilt-free daily actions.

A full UX process from research and persona work through usability testing, iterations, and a tested high-fidelity prototype.

Overview

Making digital impact feel personal.

Trace turns abstract CO2 numbers into small, daily actions people can actually take.

The Challenge

People care but don't know where to start.

Existing apps were guilt-heavy and disconnected from daily habits. Digital emissions had to feel approachable, not accusatory.

Research

Starting with a real person.

A persona, journey map, and user stories defined the full scope before any screen was drawn.

Key Screens

14 screens, two core flows.

Onboarding guides users to a personalised footprint. The action flow surfaces one daily task and celebrates completion quietly.

Testing & Iterations

Three participants. Five findings. Nine changes.

Real usability testing surfaced specific issues. Every finding was documented and directly addressed in the next iteration.

Outcome

A full UX process, start to finish.

Research-led design from persona to tested prototype. The full UX process documented end to end.

Overview

Making digital impact feel personal.

Trace turns abstract CO2 numbers into small, daily actions people can actually take.

The Challenge

People care but don't know where to start.

Existing apps were guilt-heavy and disconnected from daily habits. Digital emissions had to feel approachable, not accusatory.

Research

Starting with a real person.

A persona, journey map, and user stories defined the full scope before any screen was drawn.

Key Screens

14 screens, two core flows.

Onboarding guides users to a personalised footprint. The action flow surfaces one daily task and celebrates completion quietly.

Testing & Iterations

Three participants. Five findings. Nine changes.

Real usability testing surfaced specific issues. Every finding was documented and directly addressed in the next iteration.

Outcome

A full UX process, start to finish.

Research-led design from persona to tested prototype. The full UX process documented end to end.

Overview

The Challenge

Research

Key Screens

Testing & Iterations

Outcome

Overview

Making digital impact feel personal

Trace turns abstract CO2 numbers into small, daily actions people can actually take.

The Challenge

People care but don't know where to start.

Existing apps were guilt-heavy and disconnected from daily habits. Digital emissions had to feel approachable, not accusatory.

Research

Starting with a real person.

A persona, journey map, and user stories defined the full scope before any screen was drawn.

Key Screens

14 screens, two core flows.

Onboarding guides users to a personalised footprint. The action flow surfaces one daily task and celebrates completion quietly.

Testing & Iterations

Three participants. Five findings. Nine changes.

Real usability testing surfaced specific issues. Every finding was documented and directly addressed in the next iteration.

Outcome

A full UX process, start to finish.

Research-led design from persona to tested prototype. The full UX process documented end to end.

Interested in working together?

Let's connect!

Message sent!

I will get back to you

as soon as possible.

Interested in working together?

Let's connect!

Message sent!

I will get back to you

as soon as possible.

Hristiyan Linkov

UI/UX Designer

2026 Hristiyan Linkov. All right reserved.

Hristiyan Linkov

UI/UX Designer

2026 Hristiyan Linkov. All right reserved.