Free tool by Ondemandly
Will this AI idea get expensive?Find out first.
Pick what you want to build, add a rough audience size, and get a plain-English monthly estimate before you commit.
What this checks
Idea size, likely traffic, and room for surprises.
Tell us the shape
Click calculate to see the estimate here and send yourself a copy.
What this means
Useful before the first invoice.
- 01If the same questions come up again and again, reuse the answer instead of paying the AI to rethink it every time.
- 02Put a simple limit on answer length. It keeps the experience crisp and makes costs easier to predict.
- 03Start with one clear workflow before adding agents, uploads, search, or background jobs.
- 04Watch what real users actually do. A small group using the tool heavily can cost more than a big group using it once.
Good to remember
This is a planning number, not a bill.
The calculator gives you a quick read on whether the idea is tiny, manageable, or worth scoping more carefully before you build it.
Next step
If this is a support chatbot, you may not need to build the whole stack.
CustomGPT can turn your website, docs, and help content into a customer-service chatbot, so you can compare the estimated API cost with a hosted option.
Compare with CustomGPTDisclosure: this is an affiliate link. Ondemandly may earn a commission if you become a customer, at no extra cost to you.
The details
The math is here when you want it.
The main estimate stays simple. This section keeps the source links and model prices visible for people who want to inspect the assumptions.
Prices last checked: Apr 30, 2026
Technical pricing