Toastie

A health tracking app for people with chronic conditions. Over 3 months, I led a team of 5 designers to redesign the Insights page, making complex health data simple, actionable, and visually clear. I directed design quality, ran the process, and handled final UI polish
Role
Design lead
Timeline
Sep 2024 - Nov 2024
Scope
Insights page, data visualisation, design system QA
Problem
Users with chronic illnesses were logging symptoms but getting nothing useful back. The existing Insights page was overwhelming, hard to navigate, and failed to surface patterns or next steps.
Solution
We redesigned Insights around 3 goals:
- Make data glanceable
- Surface actionable alerts
- Help users communicate with doctors through easy data export.

Approach

We had 3 months and a team with mixed experience levels. I ran a hybrid process: waterfall for the first 2 weeks of research, then agile sprints for design and iteration.

I allocated tasks by skill level, with experienced designers on complex screens and newer members on system components.
15/100
original SUS score
2/5
satisfaction score
52
unique symptoms to log
Data before redesign

The Design Evolution

Each main screen went through 3 stages: the original Toastie design, our team's hi-fi iteration, and a final polish pass for visual consistency.

Competitive analysis & testing revealed…

10 health apps confirmed gap: strong at logging, weak in actionable insights.
Competitive analysis of 10 health apps confirmed gap: strong at logging, weak in actionable insights.
Overwhelming data
"Not sure what I'm looking at…
a bit much."
Tedious logging
"Logging 52 symptoms feels
like a chore"
No actionables
"Feels a bit underwhelming
to use"
How might we turn health data into personalised, actionable insights for busy people?
How might we turn health data into personalised, actionable insights for busy people?

Insights Hub

Added clear navigation, personalised data views, and actionable alerts for alarming symptoms.

Original Toastie

Our Hi-fi

My QA

Symptoms Analysis

Condensed data into paginated tabs with structured summaries and a calmer visual hierarchy

Original Toastie

Our Hi-fi

My QA

Data Export

Simplified the export flow with neutral tones and fewer elements, reducing cognitive load

Our Hi-fi

My QA

Challenge

The team had strong research skills but mixed design ability. Early hi-fi outputs weren't at the quality bar the client expected, and iteration cycles were taking longer than our 3-month timeline could absorb.

I spent time coaching the team on best practices and giving them opportunities to own the UI work, but as the deadline closed in I took on final polish and QA across every screen. With collaboration, I aimed to keep the essence of their designs intact while raising the consistency and finish.

Challenge

The team had strong research skills but mixed design ability. Early hi-fi outputs weren't at the quality bar the client expected, and iteration cycles were taking longer than our 3-month timeline could absorb.

I spent time coaching the team on best practices and giving them opportunities to own the UI work, but as the deadline closed in I took on final polish and QA across every screen. With collaboration, I aimed to keep the essence of their designs intact while raising the consistency and finish.

Insights Hub

Added clear navigation, personalised data views,
and actionable alerts for alarming symptoms.

Original Toastie

Our Hi-fi

My QA

Symptoms Analysis

Condensed data into paginated tabs with structured
summaries and a calmer visual hierarchy
Condensed data into paginated tabs with structured summaries and a calmer visual hierarchy

Original Toastie

Our Hi-fi

My QA

Data Export

A new feature. Users had no way to share health data with their doctors, so we designed a simple export flow from scratch.

Our Hi-fi

My QA

Symptom Categories

The original app had 52 individual symptoms to log in a flat list. We condensed them into 9 intuitive categories, cutting average logging time from 58s to 25s.

Users could find what they needed faster, and the category illustrations gave us an opportunity to bring calm warmth into a screen that previously felt chaotic.

Actionable Resources

2 new section we introduced to close the gap between tracking and acting. We added personalised tasks, automated alerts, daily streaks, and a community resources page to help users gain more insight into their conditions and connect with other people experiencing the same illness.

Results

15 75
system usability score
52 9
symptom categories
58s 25s
faster logging time

"The redesign made everything cleaner and easier to navigate.
A huge improvement from where we started."
"The redesign made everything cleaner and easier to navigate. A huge improvement from where we started."
Client, Toastie

Reflection

In 3 months, I directed 5 designers with mixed experience levels, managed client expectations, and delivered a redesign that took usability from near-unusable to strong. The biggest lesson was learning how to balance investing in the team's growth whilst protecting the result.

I wanted to give everyone the chance to do meaningful design work, and when the timeline demanded a higher polish, I worked through it alongside the team rather than in isolation. The final screens were a shared effort, not a top-down override.
Let's talk

isaac.jiang01@gmail.com

Copyright © 2026 Isaac Jiang.

Powered by 96 cups of coffee, thanks for reading!

Let's talk

isaac.jiang01@gmail.com

Copyright © 2026 Isaac Jiang.

Powered by 96 cups of coffee, thanks for reading!

Let's talk

isaac.jiang01@gmail.com

Copyright © 2026 Isaac Jiang.

Powered by 96 cups of coffee, thanks for reading!