Developer builds zero-cost, stateless AI observability platform using free-tier APIs

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A solo developer has built Cognilumin, a stateless AI observability platform, over several months during evenings and weekends. The platform offers three tools — an AI explainer, a topology visualizer, and an execution log tracer — all running at zero monthly cost. It relies on vanilla PHP and JavaScript with no frameworks, using free tiers from Gemini, Groq, and OpenRouter, with a PHP proxy that rotates API keys and handles rate-limit errors automatically. Because the platform stores no user data and requires no database or login system, it sidesteps privacy compliance concerns entirely. The developer has made a live demo publicly available and is seeking community feedback on usability and potential improvements.

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