Spanlens
Drop-in observability platform for OpenAI, Anthropic, and Gemini that logs every request, tracks costs, traces agent workflows, and flags anomalies and PII.
Technical Profile & Specs
verified 2026-11-07
- Cost
- $0 / forever (Open Source)
- License
- Open Source
- Hosting Model
- Self-host (your server)
- Platforms
- webself-hosteddocker to self-host
- Installation
- Clone https://github.com/spanlens/Spanlens or deploy with Docker Compose
- Operational Setup
- Deploy via Docker or binary release from GitHub and configure environment variables.
- Where Your Data Lives
- All application data and configuration live on your own server or local database.
- The Catch / Trade-off
- Requires self-hosting setup, updates, and server maintenance compared to managed Galileo.
Replaces 4 paid apps
up to $140/mo ($1,680/yr) in subscriptions
Spanlens FAQ
Common questions
Is Spanlens free and open source?+
Spanlens is an open-source tool licensed under Open Source that runs on self-host. Drop-in observability platform for OpenAI, Anthropic, and Gemini that logs every request, tracks costs, traces agent workflows, and flags anomalies and PII.
What paid software does Spanlens replace?+
Spanlens serves as a free replacement for 4 paid SaaS applications: Galileo, Humanloop, LangSmith, Maxim, saving up to $140/month ($1,680/year) in subscription bills.
How do you install and set up Spanlens?+
Installation: Clone https://github.com/spanlens/Spanlens or deploy with Docker Compose. Setup notes: Deploy via Docker or binary release from GitHub and configure environment variables.
What is the catch or trade-off with Spanlens?+
Requires self-hosting setup, updates, and server maintenance compared to managed Galileo.