Proof of Usefulness Report

CityRiddler

Analysis completed on 2/3/2026

+30
Proof of Usefulness Score
You're In Business

CityRiddler is a verifiable mobile application focused on gamified tourism in Vienna, Austria. While the project is functional and available on app stores, the submission contains significant inaccuracies, most notably the traction claim that 'most people have used my product,' which is demonstrably false for a niche, location-specific beta app. The product offers valid utility for its specific use case (individualized city tours), but the extremely limited scope (Vienna-only) and lack of serious data in the submission result in a low score. The application appears to be an early-stage local lifestyle business rather than a high-growth technology venture at this time.

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Score Breakdown

Real World Utility+15.0
Audience Reach Impact+2.0
Technical Innovation+6.0
Evidence Of Traction+1.25
Market Timing Relevance+5.0
Functional Completeness+0.5
Subtotal+29.75
Usefulness Multiplierx1.02
Final Score+30

Project Details

Project URL
http://www.cityriddler.com
Description
CityRiddler offers AI-generated and individualized experiences tailored to user’s interests with interactive riddles through the city – right on your smartphone, always with you. Imagine you find yourself in a new city and want to explore the history and local culture. Tourist spots tend to be crowded, activities are time and location-bound, and individualized experiences are either expensive or unavailable. CityRiddler offers individualized experiences based on users’ interests with interactive riddles. Duration and start&end location are fully customizable, riddles are fact-based, narrating the city’s beautiful culture followed by interesting information about the place. A passionate riddle community provides riddle content via a revenue-sharing model for scaling purposes. We give locals the opportunity to become a tourist in their own city.

Algorithm Insights

Market Position
Growing utility with room for optimization
User Engagement
Documented reach suggests active user community
Technical Stack
Modern tech stack aligned with sponsor technologies

Recommendations to Increase Usefulness Score

Document User Growth

Provide specific metrics on user acquisition and retention rates

Showcase Revenue Model

Detail sustainable monetization strategy and current revenue streams

Expand Evidence Base

Include testimonials, case studies, and third-party validation

Technical Roadmap

Share development milestones and feature completion timeline