Install the app, enter your API key, choose a model, and configure your first settings.

ARIA requires one API key to work: an Anthropic key for the Claude AI model. An NVIDIA key is optional — it unlocks 20+ protein analysis tools in Research mode.
Go to console.anthropic.com, create a free account, and generate a new API key. The key starts with sk-ant-.
In ARIA, click the ⚙ Settings gear in the top-right, then select API Configuration.
For protein structure tools (AlphaFold, ESMFold, etc.), get a free NVIDIA API key from build.nvidia.com and paste it in the NVIDIA card.
ARIA uses your personal API key — you pay Anthropic directly at their published rates. There is no ARIA subscription fee. Typical costs: appeal letter ~$0.01-0.03, research session ~$0.15-0.40.