Haeseong Jeon

Building open-source LLM observability

@spanlens 18 X followers spanlensFirst product launched 6mo ago

100% full-depth creator dossier open: complete product portfolio, 12-month combined traffic & MRR curves, shipping cadence, and timeline events.

Products

Products and research metrics
Product	Tagline	Category	Visits · Sep	MoM	Launched	Revenue	Actions
SpanlensOSSspanlens.ioEvery model call, on the record.	Every model call, on the record.	Prompts, Evals & LLM Observability	<5K	Prev <5K	2026-06	Undisclosed

Launches, marketing, revenue milestones, and pricing/plan/positioning changes across products