Best PostHog Alternatives in 2026

Langfuse is an open-source LLM observability and engineering platform used by AI teams to trace, debug, evaluate, and manage prompts in production. MIT-licensed, self-hostable, and trusted by over 63 Fortune 500 companies including Khan Academy.

Helicone is an open-source LLM observability platform and AI gateway from YC W23. One URL swap gives teams cost tracking, request logging, semantic caching, and prompt management across OpenAI, Anthropic, and 100+ models. Used by 16,000 organizations before its March 2026 acquisition by Mintlify.

Weights & Biases is the standard ML experiment tracking platform used by over a million AI engineers. It covers model training workflows with W&B Models and LLM observability with W&B Weave, now under CoreWeave ownership since May 2025.

MLflow is the open-source AI engineering platform used by thousands of enterprises to track experiments, manage model registries, and deploy classical ML and GenAI applications. Free under Apache 2.0, with 30 million monthly downloads.

pgvector adds vector similarity search to any PostgreSQL database. Store embeddings as native columns, query with cosine or L2 distance using plain SQL. No extra service required. Used in production by teams on Supabase, AWS RDS, GCP Cloud SQL, and Neon.

Snowflake Cortex is the AI layer built into the Snowflake Data Cloud. Data teams use it to run LLM inference, build AI agents, and deploy semantic search directly against governed Snowflake data using SQL, without moving data out of their existing security perimeter.

Pinecone is the managed vector database that pioneered the category. It stores and queries high-dimensional embeddings at scale, powering RAG pipelines, semantic search, and AI agent memory with no infrastructure to manage.

Qdrant is an open-source vector search engine built in Rust by a Berlin-based team. It powers production RAG, semantic search, and recommendation systems for enterprises including Canva, HubSpot, and TripAdvisor, with Apache 2.0 licensing and flexible deployment from laptop to edge device.

CoreWeave is a specialized GPU cloud built for enterprise AI training and inference. With 250,000+ GPUs across 32 data centers, InfiniBand-backed clusters, and NVIDIA's latest Blackwell hardware, it powers some of the largest AI labs in the world, including OpenAI, Meta, IBM, and Microsoft.

Weaviate is an open-source vector database that stores objects and embeddings together, enabling hybrid search, RAG pipelines, and AI agent workflows. Available self-hosted under BSD-3 license or as a managed service via Weaviate Cloud on AWS, GCP, and Azure.