Alternatives to Prometheus

2 editor-selected alternatives · Prometheus overview →

source: tools.alternatives · stored order · active records only; review scores are annotations and never change membership or order

A directional evidence panel appears only when the substitute rationale, trade-offs, sources, and verification date have been recorded. Older selections without that panel remain visible but are unclassified under the new evidence contract.

OpenObserve

78/100open sourcefreemiumexplicit relation

OpenObserve is an open-source observability platform that unifies logs, metrics, traces, and real user monitoring in a single binary. It claims 140x lower storage costs than Elasticsearch through columnar storage and compression, with native OpenTelemetry support, a built-in query UI, dashboards, and alerts. Designed for AI and cloud-native workloads at petabyte scale. Over 15,000 GitHub stars.

Freemium open-source cloud-native observability platform built in Rust (AGPL-3.0, 18k+★ GitHub). Self-Hosted Open Source is 100% free with unlimited logs, metrics, and traces stored directly on S3/GCS/MinIO. Self-Hosted Enterprise includes SSO/SAML, granular RBAC, and audit logs, free up to 50 GB/day ingestion (custom enterprise licensing for higher volumes). OpenObserve Cloud (SaaS) offers a 14-day free trial and transparent usage-based pay-as-you-go pricing: $0.30/GB ingestion, $0.01/GB query volume, $1.00/1K RUM sessions, and $0.15/1K error tracking events.Review →

Beszel

86/100open sourcefreeexplicit relation

Beszel is a lightweight, self-hosted server monitoring platform built in Go that tracks CPU, memory, disk, network, GPU, temperature, and Docker container metrics with historical data visualization and configurable alerts. Its simple hub-and-agent architecture deploys in minutes and consumes minimal resources compared to traditional monitoring stacks like Prometheus and Grafana.

Beszel is 100% free and open source under the MIT License ($0 software fee). There are no paid enterprise tiers, feature paywalls, or per-node limits. Users host the PocketBase-powered Hub and lightweight agents on their own infrastructure (VPS, bare-metal, or homelab), incurring only underlying host server costs.Review →

Open-source Prometheus alternatives

OpenObserve, Beszel — see all open-source developer tools.

Free Prometheus alternatives

OpenObserve, Beszel offer a free plan or free tier.

More AI Monitoring & Observability tools

same category, not editor-selected alternatives — see how Prometheus compares →

OpenLITOpenLIT is an open-source AI engineering platform that provides OpenTelemetry-native observability for LLM applications. It combines distributed tracing, evaluation, prompt management, a secrets vault, and GPU telemetry in a single self-hostable stack. With 50+ integrations across LLM providers and frameworks, it lets teams monitor AI applications using their existing observability backends like Grafana, Datadog, or Jaeger.GrafanaGrafana is the leading open-source platform for monitoring and observability visualization. It connects to virtually any data source — Prometheus, Elasticsearch, InfluxDB, PostgreSQL, CloudWatch, Datadog, and 150+ others — to create beautiful, interactive dashboards. Used by millions of users at companies like Bloomberg, JPMorgan, eBay, and PayPal. Grafana Cloud offers a fully managed experience with generous free tier. The CNCF ecosystem standard for metrics visualization.LatitudeLatitude is an agent observability platform for teams that need to inspect LLM traces, conversations, issues, and evaluation feedback in one workflow. Its public repo and docs position it as a Sentry-style monitor for AI agents, with semantic search, issue detection, annotations, MCP-assisted fixes, and cloud or self-hosted deployment paths for production debugging.JudgevalJudgeval is the open-source post-building layer for AI agents from Judgment Labs, providing OpenTelemetry-based tracing, hosted and custom evaluation scorers, and online behavior monitoring for LLM-powered applications. Instrument any function with a single decorator, score live production traffic against faithfulness and instruction-adherence checks, and feed real-world failures back into reinforcement learning or supervised fine-tuning loops.SentrialSentrial is a YC W26-backed monitoring platform for AI agent reliability in production. It semantically detects loops, hallucinations, tool misuse, and user frustration in real-time, then diagnoses root causes and recommends fixes. The platform claims 70% MTTR reduction via automated remediation including rollback, model retraining triggers, and webhooks. Sentrial positions itself as the Datadog for teams deploying autonomous AI agents at scale.DatadogDatadog is a cloud observability and security platform that unifies metrics, traces, logs, RUM, synthetics, APM, and security signals. Current pricing pages list 1,000+ integrations for Infrastructure Monitoring, with Pro from $15/host/month and Enterprise from $23/host/month when billed annually.PostHogPostHog is an open-source product and data tools platform for analytics, session replay, feature flags, experiments, surveys, error tracking, web analytics, data warehouse, CDP and LLM observability workflows. It suits developer-led teams that want one integrated product OS instead of many separate tools.Arize PhoenixPhoenix by Arize is an open-source AI observability platform for tracing, evaluating, and debugging LLM applications. It captures prompt-response pairs, retrieval context, agent tool calls, and latency data through OpenTelemetry-based instrumentation. Provides experiment tracking, dataset management, and evaluation frameworks for systematically improving AI application quality. 10K+ GitHub stars.LangfuseLangfuse is an open-source LLM engineering platform with 29K+ GitHub stars for tracing, evaluating, and monitoring AI applications. Acquired by ClickHouse, it provides detailed traces of LLM calls, prompt management with versioning, dataset-based evaluation, user feedback collection, and cost tracking. Framework-agnostic with native integrations for LangChain, LlamaIndex, OpenAI SDK, and Vercel AI SDK. Offers both self-hosted deployment and a managed cloud service.

Prometheus head-to-head

FAQ

Which Prometheus alternative is listed first?

OpenObserve is first in the editor-selected list of 2 Prometheus alternatives and carries an editorial review score of 78/100. The stored order is editorial; review scores do not determine membership or position.

Are there open-source Prometheus alternatives?

Yes — OpenObserve, Beszel are open source.

Are there free Prometheus alternatives?

Yes — OpenObserve, Beszel offer a free plan or free tier.