O11y Watch tracks free tiers and pricing for 73 observability tools — APM, logs, error tracking, uptime, on-call and LLM tracing. Every limit is copied from the vendor's pricing page with a source link and check date, and pages are diffed weekly so you hear about price hikes and shrinking free tiers before your invoice does. Compare any three tools side by side, use the free JSON API, or get same-day alerts with Pro.
