I’m a solo developer and have spent the past year building MulMarket, a desktop analytics platform for CS2 skin traders.
It aggregates price data from multiple marketplaces (Steam, Skinport, CSFloat, BUFF163, DMarket, Bitskins, etc.) and helps users track portfolio value, detect arbitrage opportunities, and analyze price trends.
The main reason I built it was frustration with existing tools — most are web-based, require account linking, or lack accurate fee calculations and long-term tracking.
MulMarket runs locally on the user’s machine, does not require Steam login, and does not collect personal data.
It’s still early stage and I’m actively looking for feedback, especially on:
• Data reliability and aggregation methods • UX for traders managing large inventories • Features that would make it more useful for serious traders
Happy to answer any technical or product questions.