Free & Open Source

$0. No catch.

Costly is 100% free and open source. Self-host it, own your data, and get AI-powered cost intelligence across your entire data stack.

Everything Included
$0/forever

Self-hosted. No limits. No credit card.

  • Unlimited platform connections
  • 15+ connectors (AWS, Snowflake, Databricks, dbt Cloud, OpenAI, and more)
  • AI expert agents (per-platform cost specialists)
  • Smart cost recommendations with dollar estimates
  • Anomaly detection & alerts
  • Slack & email notifications
  • Cost attribution by team & project
  • 90-day data retention
  • Self-hosted — your data stays in your infrastructure
  • 100% open source (MIT license)
Get Started Free →View on GitHub

All data stays in your infrastructure. End-to-end encryption in transit and at rest. Deploy with Docker Compose in under 5 minutes.

Frequently asked questions

Everything you need to know about Costly.

Which platforms does Costly support?
Costly connects to 15+ data platforms including AWS (21 services), Snowflake, BigQuery, Databricks, dbt Cloud, Fivetran, Airbyte, OpenAI, Anthropic, Gemini, GitHub Actions, Looker, Tableau, Monte Carlo, and more.
Is it really free?
Yes. Costly is 100% open source under the MIT license. Self-host it on your own infrastructure at no cost. No paid tiers, no feature gates, no usage limits.
Do you store my API keys or credentials?
Credentials are encrypted with AES-256 (Fernet) before being stored. Since you self-host, everything stays in your own database — nothing leaves your infrastructure.
How long does setup take?
Most connectors are live in under 2 minutes. You provide read-only API keys or OAuth credentials, and Costly starts pulling cost data immediately.
Does Costly modify anything in my platforms?
No. Costly is fully read-only across all connectors. When the AI agent recommends an optimization, it shows you exactly what to do — you decide whether to act.
What are expert agents?
Each platform gets a dedicated AI cost specialist loaded with deep billing knowledge — pricing models, gotchas, optimization patterns. Ask about Snowflake costs and you get a Snowflake billing expert, not a generic chatbot.

Stop flying blind on data platform costs

Deploy in 5 minutes. Connect your stack. Let the AI experts find the waste.

Get Started Free →Star on GitHub