The four tools listed here are all built for enterprises, so you'll mostly be telling them apart by scope, how pricing works and how you'd integrate them, rather than by whether they're free or paid.

Scope. Some tools focus on bots and fraud. DataDome covers bots and online fraud across websites, apps and APIs. HUMAN Security adds ad fraud. Kasada includes control over AI agents. Imperva is a wider application, API and data security platform, with bot protection as one part of it.
Pricing transparency. DataDome is the only tool here with a published starting price, from $3,830/mo. HUMAN, Kasada and Imperva all ask you to contact sales.
Integration and API access. Imperva is the only one we list with an API. Check this if you want to connect protection to your own tools or automate it.
What you need to protect. List what you're defending: web pages, mobile apps, APIs, sign-up forms or ad traffic. Then match that list to each tool's stated coverage. HUMAN, for example, names mobile apps directly.

We haven't tested these tools ourselves, so ask for a trial or proof of concept using your own traffic.

Frequently asked questions

Are there free bot protection tools in this list?

No. DataDome is paid, starting at $3,830/mo, and HUMAN Security, Kasada and Imperva all price through their sales teams. None of the tools listed here has a free plan.

How much does bot protection cost?

DataDome is the only tool here with a published price, starting at $3,830/mo. HUMAN Security, Kasada and Imperva only give quotes, so you'll need to talk to sales to compare costs.

What should I look for in a bot protection tool?

Check four things: that it covers what you need to protect (websites, mobile apps or APIs), whether you need fraud or ad fraud protection as well, whether it has an API for integration (Imperva lists one), and whether it can handle AI agents (Kasada mentions this).

What are the alternatives to DataDome?

In this category, the alternatives are HUMAN Security (bot, fraud and ad fraud protection), Kasada (bot defense, fraud detection and AI agent control) and Imperva (a wider application, API and data security platform).