How credits and usage work

Every plan comes with a credit budget. Credits are shared between the database, the calculators, and the AI assistant, so you can spend them however suits your work. There is no separate “AI budget” that runs out while you still have searches left.

What costs a credit

• Database search: one search equals one credit. Browsing catalogs and reading schema details is free.
• Calculator run: each calculator costs a small number of credits. The exact cost is shown next to each calculator on the calculators page.
• AI turn: each turn costs credits based on how much the assistant reads and writes during that turn. A short question costs less than a long multi step session.

Plans at a glance

• Free: 50 searches per month, 10 rows per page, up to 25 rows per query, access to the free calculators and the AI assistant.
• Plus ($20 per month): 50 credits per day, 50 rows per page, up to 500 rows per query, broader calculator access.
• Engineer ($40 per month): 100 credits per day, unlimited monthly, full calculator access, uncapped AI messages.
• Professional ($100 per month): 1,000 credits per day, unlimited monthly, full calculator access, with a daily AI message ceiling that protects against runaway use (still much more usage than Engineer tier).
• Enterprise: unlimited usage by arrangement. See contact.

The pricing page always has the current numbers. If the pricing page and this page ever disagree, trust the pricing page.

Why AI turns vary in cost

A simple single step question (for example “look up the density of water at 20 C”) uses one tool and costs a small amount. A multi step question (for example “size this pump, then check voltage drop on the motor feeder, then list the breaker”) uses several tools in sequence and costs more.

You always see the credit cost of a turn after it finishes. If a turn would exceed your remaining credits, the assistant reports the shortfall before it runs the expensive part.

What resets and when

Daily caps reset at midnight UTC. Monthly caps reset on the first day of the month. If you hit a daily cap you can keep browsing and reading results you have already pulled, but further chargeable actions wait until the next day.

Your current usage is visible on your account page, including today’s credit spend and how much of the cap is left.

What does not count against credits

• Browsing the table catalog.
• Viewing table schemas and column descriptions.
• Viewing plan pages, pricing, or account settings.
• Sample data on the public reference pages.

In other words, anything that shows you what is in the library is free. Only the actions that actually pull engineering values or run calculations count toward your daily credits.