Free LLM gateway & observability tools (2026)

Gateways, error tracking and product analytics with free plans. 3 providers, each with the free-tier text from its official pricing page and the date we checked it.

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3 free LLM gateway & observability tools compared

Cloudflare AI Gateway

Checked on 17 Oct 2026

Free tier: Core features (analytics, caching, rate limiting, DLP) free on all plans; log storage on Workers Free: 100,000 logs total across all gateways.

  • Auth: Cloudflare account; proxies your provider keys
  • Serving public users: Yes.
  • Note: Handy as a caching/rate-limit layer in front of free LLM APIs.
  • Source: developers.cloudflare.com

Sentry

Checked on 17 Oct 2026

Free tier: Developer plan free: one user, error monitoring and tracing, email alerts, 10 custom dashboards (event quotas on page).

  • Auth: DSN (public key) + auth token
  • Serving public users: Yes.
  • Note: New users: 5,000 free session replays/month for first 3 months.
  • Source: sentry.io

PostHog

Checked on 17 Oct 2026

Free tier: Free every month (with or without card): 1M analytics events, 5K session recordings, 1M feature-flag requests, 100K exceptions, 1,500 survey responses, 1M rows data sources.

  • Auth: Project API key (public) + personal API key
  • Serving public users: Yes.
  • Note: Includes LLM analytics/AI observability products.
  • Source: posthog.com

Each free tier was read from the provider’s official pricing or limits page on 17 Oct 2026 and is linked as the source. Anything the page does not state is written as unknown. Free tiers change often, so confirm before you build on one.