Master Your Race Day.

Every runner has a training plan. It’s time you had a racing plan, too.

Explore the App

Race Smarter. Run Faster.

App Preview

PacePal App Interface Screens

Your all-in-one race app—from signing up to crossing the finish line faster.

What’s in the App?

Pacing Plan

Plan your race pace with a step-by-step game plan for race day.

Course Analysis

Elevation-aware pacing adjustments to tackle the hills.

Race Catalog

Find and sign up for your next race directly from the platform.

Personalized Profile

Your pacing style, strengths, and personal race preferences.

3 Steps to Make Your Race Plan

3 Steps Flow

PacePal Mission

Many people have a time target on race day but don’t know how to achieve it. PacePal serves as a race coach that creates a simple race-day plan so you never have to guess how to run your best. We handle the tricky details like hills and weather to make sure your hard work in training leads to personal best time.

Why use PacePal?

1

Your Race-Day Coach

Guides you step-by-step to help you run your best and hit new personal records (PBs).

2

Smart Pacing Plans

Creates a custom race strategy based on the course, weather, and how you run—learning whether you’re strong on hills, flats, or better at pacing yourself.

3

Saves Time & Stress

No more guessing or hours of planning. PacePal turns complicated details into a simple, ready-to-run plan.

4

Never Miss a Race

Get reminders when sign-ups open, so you don’t forget to register for the races you want to run.

The Team

Justin R. Choi

Founder

Tap to see stats

The Stats

  • 5km: 18:57
  • Half Marathon: 1:28:25
  • Marathon: 3:13:56
1x UTMB Finisher 8x Ultra Finisher
Justin CHOI – UTMB® Index

PacePal Team

Product Engineer Intern (iOS/Mobile)

  • You will build the actual iPhone app runners use to view and execute their race strategies.
  • Transform design mockups into a fully functional, highly responsive iOS application.
  • Optimize the app's performance to ensure smooth scrolling and fast data loading.
  • Proficient in Swift and SwiftUI for building modern mobile interfaces.
  • Proficient in Apple app architecture, state management, and debugging.
Apply for this role

Applied AI & Data Scientist Intern

  • You will build the "brain" of PacePal that calculates the perfect, personalized pacing strategy for race day.
  • Develop algorithms that analyze GPS course data, elevation changes, and user running history.
  • Apply complex pacing math (like Grade Adjusted Pace) to generate hyper-accurate, kilometer-by-kilometer race splits.
  • Proficient in Python and data libraries like Pandas and NumPy.
  • Proficient in data analysis, statistics, and mathematical modeling.
Apply for this role

Cloud Systems & Infrastructure Intern (Backend)

  • You will build the invisible engine and server architecture that powers PacePal behind the scenes.
  • Set up and maintain the cloud servers needed to process our AI pacing calculations in real-time.
  • Design and manage the database to securely store user profiles and thousands of global race maps.
  • Proficient in backend server frameworks (like Python FastAPI or Flask) and building APIs.
  • Proficient in database management (SQL) and cloud hosting environments.
Apply for this role

Lead Product Design Intern (UX/UI)

  • You will design exactly how PacePal looks and feels, creating a premium, intuitive experience for runners.
  • Design sleek, modern, "dark-mode" interfaces and interactive mockups for the entire app.
  • Solve complex layout challenges to make detailed race data easy to read while running.
  • Proficient in Figma, rapid prototyping, and mobile design principles.
  • Requirement: Must provide a portfolio showcasing past design projects and user interface work.
Apply for this role

Product Growth & Strategy Intern

  • You will grow PacePal's community by finding our first beta testers and turning their feedback into app features.
  • Lead digital marketing campaigns across running communities (Strava, Reddit, TikTok, local run clubs).
  • Conduct interviews with beta testers to gather feedback and figure out what features runners truly want.
  • Proficient in digital marketing strategy, community building, and user communication.
  • Requirement: Must provide evidence of past marketing success, community growth projects, or successful social media campaigns.
Apply for this role

Stay Tuned.

App coming soon on the App Store.