OpenAI 2026 hackathon

Mei-Tra

A real-time online card game where four players compete in teams, bringing the Japanese game Meisen Trump to the web and mobile.

Solo project by hikaru endo · 1 likes · 0 comments

View the project on Devpost

Archive position — measured, not model output

1 like on Devpost

505 of the 7,850 archived projects have more likes, and 1,758 share exactly 1 — so this project's #1,439 place in the like-ranked listing is a tie-break inside that group, not a ranking.

Projects (log scale)

1
10
100
1k
10k
05,587
11,758
2284
3–4132
5–975
10+14

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.

User Stories BotA demo video on every pull request

Get a demo video on every new feature

GitHub App that watches your pull requests and records a narrated, captioned demo.
Save time on demo prep and make informed decisions faster with a video walkthrough of every new feature.

Executive Summary

What the company appears to be

Mei-Tra is a self-reported real-time online card game platform inspired by Meisen Trump, a traditional Japanese team card game. The project was built as a hackathon submission and includes both web and mobile components.

What changed

The author states this is a new product built from scratch for the OpenAI 2026 hackathon. No prior version or evolution is described.

Single most important open question

Is there any evidence of user adoption, revenue, or customer traction beyond the hackathon submission?

The description is self-reported and unverified. It contains no evidence of revenue, customers, or market traction. The project appears to be a proof-of-concept built for a hackathon with no demonstrated commercial activity.

Back to contents

What The Product Actually Is

The description states that Mei-Tra is:

  • A real-time online card game
  • Based on Meisen Trump, a traditional Japanese team card game
  • Designed for four players competing in teams
  • Available on web and mobile platforms
  • Built using Next.js, React, TypeScript, SCSS, NestJS, Socket.IO, Expo.io, and WebSockets

The author describes it as a complete real-time experience that includes:

  • Room creation and management
  • Player invitation or computer player filling
  • Trump suit declaration and target score setting
  • Card playing with turn tracking
  • Trick and team score tracking
  • Multi-round gameplay
  • Order reference, play logs, and in-game chat

Evidence This is self-reported by the author. No independent verification of product functionality or user experience.

Back to contents

Positioning & Claim Evolution

The description states that Mei-Tra:

  • Preserves the traditional Japanese game Meisen Trump
  • Makes it accessible online to players anywhere
  • Is a complete real-time multiplayer card game experience

The project is positioned as:

  • A digital adaptation of a traditional game
  • An online version of a local community activity
  • A platform for playing team-based card games with friends or AI opponents

Evidence This is the author's own claim about positioning. No evidence of market testing, user feedback, or competitive positioning beyond the hackathon context.

Back to contents

Target Customer & ICP

The description states that Mei-Tra targets:

  • Players interested in traditional Japanese team card games
  • People wanting to play Meisen Trump online
  • Friends who want to play together remotely
  • Users seeking multiplayer card game experiences

The target customer appears to be:

  • Gamers interested in strategy-based card games
  • Players of traditional Japanese games
  • Individuals seeking remote multiplayer gaming options

Evidence This is self-reported. No evidence of actual customers, user segments, or market research.

Back to contents

Business Model & Pricing Evidence

The description does not contain any information about:

  • Revenue model
  • Pricing structure
  • Monetization strategy
  • Customer acquisition costs
  • Sales channels

Evidence Not evidenced. The project appears to be a hackathon submission with no commercial implementation described.

Back to contents

Technical & Delivery Signals

The description states that the product was built using:

  • Frontend: Next.js, React, TypeScript, SCSS
  • Backend: NestJS
  • Mobile: Expo.io
  • Real-time communication: Socket.IO and WebSockets
  • Shared types across frontend, backend, and mobile
  • Development tools: Codex for code inspection and submission refinement

Technical challenges mentioned include:

  • Client synchronization
  • Turn order enforcement
  • Handling temporary disconnects
  • Modeling game phases and rules

Evidence This is self-reported technical implementation. No evidence of production deployment, scalability, or performance metrics.

Back to contents

Traction & Maturity Signals

The description states that this project:

  • Was built for the OpenAI 2026 hackathon
  • Is a proof-of-concept submission
  • Has no commercial traction or user adoption described
  • Was refined with Codex assistance

No evidence of:

  • User base or active players
  • Revenue generation
  • Customer engagement metrics
  • Product usage data
  • Market validation
  • Growth indicators

Evidence Not evidenced. The project is described as a hackathon submission with no demonstrated traction.

Back to contents

Competitive Context

The description does not contain any information about:

  • Direct competitors
  • Market size or growth
  • Competitive advantages
  • Market positioning relative to existing card games
  • Industry trends or dynamics

Evidence Not evidenced. No competitive analysis or market context provided.

Back to contents

Open Questions & Risks

Based on the self-reported description, key risks and open questions include:

  • The project is a hackathon submission with no commercial history
  • No evidence of user adoption or revenue generation
  • Single-person team suggests limited development capacity
  • Traditional card games may have limited appeal in digital markets
  • Real-time multiplayer games are technically complex and expensive to maintain
  • No evidence of market validation or customer feedback

Inference The lack of any commercial evidence, combined with the hackathon context, suggests this is an unproven concept without demonstrated viability.

Back to contents

Questions the description leaves open

  1. What specific user problems are you solving beyond the hackathon context?
  2. Have you conducted any market research or user testing?
  3. What is your plan for monetization and revenue generation?
  4. How do you intend to scale beyond a single developer team?
  5. What is your timeline for product development and market entry?
  6. Are there any existing users or beta testers for this platform?
  7. What are the technical challenges you've identified that could impact scalability?
  8. How do you plan to compete with established online gaming platforms?

Back to contents

Overall Assessment

Not evidenced. The description contains no information about:

  • Financial performance
  • Customer base
  • Revenue streams
  • Market traction
  • Commercial viability
  • Team experience or track record

The project appears to be a hackathon submission with no demonstrated commercial activity, revenue, or user adoption. The single-person team and lack of any commercial evidence suggest this is an early-stage concept without proven market demand.

Confidence level Very low. This analysis is based entirely on self-reported information from a hackathon submission with no independent verification of product functionality, market traction, or commercial viability.

Back to contents

User Stories BotA demo video on every pull request

Get a demo video on every new feature

GitHub App that watches your pull requests and records a narrated, captioned demo.
Save time on demo prep and make informed decisions faster with a video walkthrough of every new feature.

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.

Are you the author of this project? Request removal or a correction (support@kfginternational.com). Requests from authors are acted on within 48 hours, and in any case within seven days. Privacy notice.