OpenAI 2026 hackathon

Stride Mix

Stride Mix turns your running intervals into an energy curve and fills each phase with real music — hard for the pushes, calm for recovery — that you pick, swap, and play in-app.

Solo project by Sejin Jung · 0 likes · 0 comments

View the project on Devpost

Archive position — measured, not model output

0 likes on Devpost

2,263 of the 7,850 archived projects have more likes, and 5,587 share exactly 0 — so this project's #6,994 place in the like-ranked listing is a tie-break inside that group, not a ranking.

Projects (log scale)

1
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1k
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05,587
11,758
2284
3–4132
5–975
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Likes on Devpost. ▲ marks this project's group.

Show the figures
LikesProjectsShare of archive
05,58771.2%
11,75822.4%
22843.6%
3–41321.7%
5–9751.0%
10+140.2%
Devpost like counts for all 7,850 archived projects, captured when this archive was built.

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Executive Summary

What the company appears to be

Stride Mix is a self-reported web application that dynamically generates music playlists for running intervals based on an energy curve derived from interval timing and effort levels. It uses YouTube playback and allows users to customize tracks per phase of their workout.

What changed

The project was submitted as part of a hackathon, indicating it is in early development or prototype form. No commercial traction, revenue, or customer data are evidenced.

Single most important open question

Is there any evidence that the product has been used beyond the author’s own testing or demo environment?

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What The Product Actually Is

The description states:

  • Stride Mix is a web app built with HTML, CSS, and vanilla JavaScript.
  • It reads interval plans as an energy curve where each phase maps to a 1–5 effort level.
  • It builds a queue of music tracks that match the effort level of each interval phase.
  • The app uses YouTube for playback via embedded player.
  • It includes a timer with coaching cues and allows users to edit intervals, reorder phases, or swap tracks.
  • It supports drag-and-drop mini player and search functionality via YouTube.

Inference The product is a single-page application (SPA) that runs in the browser without build steps or frameworks. It uses serverless functions for YouTube API access and relies on pre-defined audio IDs for playback in demos.

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Positioning & Claim Evolution

The description states:

  • The app addresses the “rhythm problem” of regular playlists not matching effort levels during running intervals.
  • It aims to provide music that moves with the workout — high energy during pushes, calm during recovery.
  • It is described as not trying to beat-match cadence to the millisecond but instead aligning energy with effort.

Inference The positioning is centered on solving a specific pain point in interval training: mismatched music and effort. The app positions itself as an intelligent playlist generator for runners, not a general-purpose music player or fitness tracker.

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Target Customer & ICP

The description states:

  • The target user is someone who runs intervals and struggles with playlists that don’t match their effort levels.
  • It is aimed at runners who want to avoid using their phone mid-run and prefer an app that adapts to their workout rhythm.

Inference The ICP appears to be runners doing interval training, particularly those who are tech-savvy or interested in optimizing their workouts with digital tools. No specific demographics or user segments are detailed.

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Business Model & Pricing Evidence

Not evidenced.

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Technical & Delivery Signals

The description states:

  • Built with HTML5, CSS3, JavaScript (vanilla), SVG, PWA, responsive design, and Web Speech API.
  • Uses the History API for URL slugs (/build, /mix, /run).
  • No build step or framework used — dependency-free.
  • Playback runs through YouTube player; no audio mixing or overlapping.
  • Serverless function (api/search.js) handles YouTube search with a free key.
  • Core is static-hosted with SPA fallback server.

Inference The technical stack suggests a lightweight, self-contained web app with minimal dependencies and a focus on performance and portability. The use of YouTube playback and no audio mixing implies a low-risk, scalable approach to music delivery.

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Traction & Maturity Signals

Not evidenced.

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Competitive Context

Not evidenced.

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Open Questions & Risks

  • The product is described as a hackathon submission with no evidence of commercial traction or user adoption.
  • It relies on YouTube playback and lacks a rights-cleared catalog, which may limit scalability or monetization.
  • No mention of data privacy, user retention, or long-term engagement strategies.
  • The app’s reliance on pre-defined audio IDs for demo purposes suggests it is not yet production-ready.

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Questions the description leaves open

  1. Has the product been tested by users beyond the author's own use?
  2. Are there any plans to monetize or scale the service?
  3. What are the limitations of relying on YouTube playback for music delivery?
  4. How is the energy curve calculated, and how does it handle edge cases like very short intervals?
  5. Is there a plan to integrate with Spotify or other music platforms?

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Overall Assessment

Not evidenced.

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Source

Submitted to the OpenAI 2026 hackathon on Devpost. Project home on Devpost. Back to the full gallery on Devpost.

This competitive analysis was produced by top-founders.com (opens in a new tab)

Generated by a language model from this project's public Devpost page — its tagline, the author's own write-up and any built-with tags listed there — as captured in August 2026. Short quotations are the author's words. It is an opinion on the idea as a business, not on the people behind it, and it reflects the description as published then. If the project has moved on, request a correction below. The analysis is not independent research and contains no verified traction, revenue or customer data.

An independent guide by KFG International LLC — not affiliated with, endorsed by, or connected to Devpost or OpenAI.

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