Alternatives to W&B Weave

3 editor-selected alternatives · W&B Weave 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.

Langfuse

87/100open sourcefreemiumexplicit relation

Langfuse 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.

Langfuse is open-source under MIT for self-hosting with full features. Langfuse Cloud provides a free Hobby tier (50k units/month, 2 users), a Core plan at $29/month (100k units, unlimited users), a Pro plan at $199/month (3-year retention, SSO, SOC2), and an Enterprise plan at $2,499/month with custom SLAs.Review →

Helicone

84/100open sourcefreemiumexplicit relation

Helicone is an open-source LLM observability and AI gateway platform with proxy-based request logging, cost tracking, latency monitoring, caching, rate limits, user analytics, prompt tools, and HQL. It supports OpenAI, Anthropic, Azure, LiteLLM, Anyscale, Together AI, and OpenRouter integrations, and now presents itself as part of Mintlify while continuing managed and self-hosted gateway/observability workflows.

Helicone is open-source under Apache 2.0. Its hosted AI Gateway offers a Free Hobby plan (10,000 requests/month, 7-day logs), a Pro tier at $79/month for unlimited team seats and custom dashboards, a Team tier at $799/month for multi-org setups and SOC-2/HIPAA, and tailored Enterprise contracts.Review →

Arize Phoenix

87/100open sourcefreemiumexplicit relation

Phoenix 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.

Arize Phoenix is 100% free and open-source for self-hosted local and private cloud tracing under Elastic License 2.0. Managed Arize AX SaaS offers a Free tier with 25k spans/month and 15-day retention, an AX Pro tier at $50/month with 50k spans/month and 30-day retention, and an AX Enterprise plan with custom data volume, VPC deployment, and enterprise SLAs.Review →

Open-source W&B Weave alternatives

Langfuse, Helicone, Arize Phoenix — see all open-source developer tools.

Free W&B Weave alternatives

Langfuse, Helicone, Arize Phoenix offer a free plan or free tier.

More AI Monitoring & Observability tools

same category, not editor-selected alternatives — see how W&B Weave 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.BraintrustBraintrust is an AI observability and evaluation platform for tracing LLM applications, building datasets, running prompt/model experiments, scoring outputs and turning production feedback into regression tests. It fits teams that need repeatable quality gates for AI releases rather than one-off prompt demos.SentrySentry is the leading error tracking and performance monitoring platform for developers. Captures and aggregates errors with full stack traces, breadcrumbs, and context across 100+ platforms. Used by over 100,000 organizations. Features session replay, performance tracing, and code-level profiling. A self-hosted deployment is available under FSL-1.1-Apache-2.0.

FAQ

Which W&B Weave alternative is listed first?

Langfuse is first in the editor-selected list of 3 W&B Weave alternatives and carries an editorial review score of 87/100. The stored order is editorial; review scores do not determine membership or position.

Are there open-source W&B Weave alternatives?

Yes — Langfuse, Helicone, Arize Phoenix are open source.

Are there free W&B Weave alternatives?

Yes — Langfuse, Helicone, Arize Phoenix offer a free plan or free tier.