Proof of Usefulness Report

Sellfy

Analysis completed on 1/29/2026

+432
Proof of Usefulness Score
Certified Problem Solver

Sellfy is a well-established e-commerce platform (founded 2011) with verified revenue (~$2.4M) and a significant user base, positioning it as a strong competitor in the creator economy. However, the submission itself is of extremely poor quality, containing vague claims ('everyone', 'most people'), inaccurate data (market cap 'null'), and irrelevant tags ('energy-solutions'). The score reflects the high real-world utility and verified traction of the actual business, heavily penalized by the lack of effort and evidence in the specific submission provided.

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Score Breakdown

Real World Utility+21.25
Audience Reach Impact+6.00
Technical Innovation+6.00
Evidence Of Traction+9.38
Market Timing Relevance+8.00
Functional Completeness+0.25
Subtotal+50.88
Usefulness Multiplierx0.85
Final Score+432

Project Details

Project URL
sellfy.com
Description
Sellfy is an e-commerce platform that allows digital content publishers (ebook authors, musicians, software developers) open their store and sell products directly to their audience.\n\nAnyone can start selling digital products within seconds as Sellfy takes care of file storage, delivery and payments so that clients can focus on creating great content. On top of that Sellfy has powerful marketing tools like built-in email marketing features, upsells, discounts and more!

Algorithm Insights

Market Position
Strong market validation with clear user adoption patterns
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