Mobile App, SNS, Web App

SNS site for Cosplayers

COSPO is an app that allows users to support and discover Japanese cosplayers.
Users can view photo posts and tap the “KAWAII” button to cheer for cosplayers.

Durations:

6

Team size:

3

Requirements Definition

Basic Design

Detail Design

Development

Testing

Release

Maintenance

About Project:

Through real-time photo updates, free-to-view posts, and a user ranking system, the app promotes interaction between fans and cosplayers.
Key features include:
・Posts (text, video, photos)
・Point rewards
・Events
・Rankings

Devices

.

Browser(Chrome, Safari), Iphone, Android Phone

Server and others

.

Sakura Cloud

Technology

Java Spring Boot Java Spring Boot
NodeJS NodeJS
Flutter Flutter

Challenge

While the platform thrives on fan interaction and popularity (via the KAWAII button, rankings, and points), this structure can create imbalances and discourage emerging or lesser-known cosplayers:
・Popular cosplayers dominate rankings, making it harder for newcomers to get discovered
・“Point farming” or unfair boosting can skew rankings and affect credibility

Solution

Tiered Ranking System
・Separate cosplayers into tiers or leagues (e.g., Newcomers, Rising Stars, Pro Level), so users can discover talent across experience levels
・Rankings reset periodically per tier to give everyone a fair chance at visibility and rewards
・Allow users to filter by tier when browsing posts or events

KAWAII Engagement Algorithm
・Weight “KAWAII” points based on user engagement level (e.g., long-term fans vs. bots or spam accounts)
・Cap or decay older points to prioritize recent interactions, keeping rankings dynamic
・Detect and flag suspicious voting patterns (e.g., vote spamming)

Project Gallery

(6)
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