CarShare
Enabling trusted groups to share vehicles seamlessly, reducing costs and environmental impact
Section 01
Introduction
Project Overview
CarShare is a mobile application designed to facilitate vehicle sharing among trusted groups of friends, family, or colleagues. The platform provides scheduling, expense tracking, and vehicle management tools to make shared car ownership seamless, affordable, and sustainable.
My Role
Lead UX/UI Designer responsible for user research, persona development, information architecture, wireframing, prototyping, and high-fidelity visual design.
Section 02
User Problem
Car ownership is costly and inefficient, with vehicles sitting idle 95% of the time. While ride-sharing services exist, they don't address the need for trusted, long-term vehicle sharing within private groups. Users struggle with coordination, fair cost distribution, and maintaining trust when sharing vehicles.
Average annual cost of car ownership in the US
Time cars sit parked and unused
Of people interested in vehicle sharing with trusted groups
"How might we enable trusted groups to share vehicles safely and fairly, while reducing ownership costs and environmental impact?"
Section 03
Research & Insights
User Interviews
18 in-depth interviews with potential car-sharers
Competitive Analysis
Studied 6 car-sharing platforms and coordination apps
Surveys
145+ responses from diverse demographics
Key Findings
- ✓ 82% want real-time vehicle location and status updates
- ✓ Users need clear rules for booking priority and conflicts
- ✓ Automated expense splitting is a critical feature
- ✓ Vehicle condition reports build trust and accountability
User Pain Points
- ✗ No transparency on vehicle availability and condition
- ✗ Manual coordination via group chats is chaotic
- ✗ Unclear expense tracking leads to disputes
- ✗ Concerns about liability and damage responsibility
Section 04
User Personas
Alex Rivera
26 • Software Developer
Reduce car ownership costs while maintaining occasional vehicle access
Paying insurance and parking for a car I only use twice a week
Jamie Chen
21 • College Student
Share transportation costs with roommates for weekend trips
Rental cars are expensive and pickup locations are inconvenient
Morgan Taylor
34 • Marketing Manager
Coordinate vehicle sharing with coworkers for team activities
Difficult to track who used the car and split expenses fairly
Section 05
UX Strategy
Trust & Safety First
Build confidence through vehicle condition reports, user verification, damage documentation, and clear liability guidelines for all group members.
Seamless Scheduling
Intuitive calendar with real-time availability, automated conflict detection, booking priorities, and instant notifications for all schedule changes.
Fair Cost Distribution
Transparent expense tracking with automated splitting based on usage, mileage, and time. Integrated payments and detailed financial history.
Section 06
Information Architecture & Flow
Mapped out the complete user journey from onboarding to vehicle booking, expense tracking, and group management with focus on minimal friction.
Section 07
Wireframes
Low-fidelity wireframes mapping out the key user flows based on the information architecture
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Hello, Sarah
Active Booking
Honda Civic 2020
Today, 2:00 PM - 6:00 PM
Groups
Usage
Expenses
Profile
Recent Activity
John used Honda Civic
2 hours • 15 miles
Emma logged expense
Gas $45 • Yesterday
You completed a trip
4 hours • 32 miles
Main Dashboard
Central Hub
Create/Join Group
Create New Group
Create/Join Group
Start or Join
Family Carpool
Honda Civic 2020
ABC-1234
Usage This Month
Miles
342
Hours
28
Recent Activity
View Group Dashboard
Usage Summary
Log Car Usage
Honda Civic 2020
ABC-1234
Time
Distance (miles)
Fuel Level
Notes (Optional)
Log Car Usage
Time, Distance
Profile
Sarah Johnson
sarah@email.com
Full Name
Phone
License Number
Address
Manage Profile Info
Edit User Details
Add Car
Make
Model
Year
License Plate
Add Car to Group
Register Vehicle
Invite Members
Invite to Family Carpool
Add new members to your car sharing group
Name
Pending Invites
John Smith
john@email.com
Emma Davis
emma@email.com
Mike Wilson
mike@email.com
Invite Users
Add Group Members
Section 08
Final Designs
High-fidelity designs showcasing the complete user experience with clean visuals, intuitive navigation, and seamless vehicle sharing workflow.
Welcome back
Sarah Johnson
Active Vehicle
Currently Active
Tesla Model 3
ABC123 • Electric
Sarah has the key
Your Groups
Family Cars
+2
5 members • 2 cars
Office Pool
+5
8 members • 3 cars
Recent Activity
You returned Tesla Model 3
Today, 2:30 PM • 45 km
Sarah picked up Tesla Model 3
Today, 3:15 PM
Monthly usage report ready
Yesterday, 8:00 AM
Main Dashboard
My Groups
Active Groups
Family Share
4 members • 2 cars
Office Team
8 members • 3 cars
Weekend Warriors
6 members • 4 cars
College Carpool
5 members • 2 cars
Invitations
Weekend Warriors
Sarah Chen invited you
6 members • 4 cars
My Groups
Log Car Usage
Selected Vehicle
Honda Civic 2020
ABC-1234
Available
Start
2:00 PM
End
6:00 PM
32
3/4 Full
Highway drive, smooth trip
Log Car Usage
Add New Vehicle
Upload Photo
Tap to add car image
Honda
Civic
2020
Silver
ABC-1234
Add Car to Group
Invite Members
Family Carpool
Add new members to your group
+3
member@email.com
Mike Wilson
Pending Invites
3
John Smith
john@email.com
Emma Davis
emma@email.com
Lisa Chen
lisa@email.com
Invite Users
Section 09
Usability Testing
Participants tested the prototype
Task completion rate
Average usability score
Key Improvements
Section 10
Design System
Color Palette
Visual Style
Key Components
Buttons
Cards
Card Title
Subtitle text
Input Fields
Label
Input value
Section 11
Business Model & Impact
Revenue Streams
- 💳 Freemium model: $4.99/month per group for premium features
- 🚗 Transaction fee: 2.5% on automated expense payments
- 🤝 Insurance partnerships and affiliate commissions
Projected Impact
Expected users in first year
Average annual savings per user
Reduction in carbon emissions per user
Section 12
Learnings & Reflections
What Worked Well
- • Trust-building features (condition reports, verification) resonated strongly
- • Automated expense splitting was the most requested feature
- • Clean visual design made complex coordination feel manageable
- • Calendar integration reduced scheduling conflicts significantly
Challenges & Solutions
- • Balancing flexibility with clear group rules and accountability
- • Addressing liability concerns through insurance partnerships
- • Simplifying onboarding while gathering necessary verification
- • Managing diverse group dynamics and usage patterns
Section 13
Next Steps
Security Enhancement
Implement biometric vehicle access and advanced fraud detection
AI Integration
Smart scheduling recommendations based on usage patterns
Expansion
Launch corporate sharing for company fleets and expand internationally