# Data Theorem API Security vs @fastify/rate-limit: side-by-side comparison (2026) [Data Theorem API Security](https://cybersectools.com/tools/data-theorem-api-security) is a commercial [API security](https://cybersectools.com/categories/api-security) solution by [Data Theorem](https://cybersectools.com/companies/data-theorem). [@fastify/rate-limit](https://cybersectools.com/tools/fastifyrate-limit) is a free [API security](https://cybersectools.com/categories/api-security) solution. Features, integrations, deployment and the company behind each one, side by side. Need the answer fast? [Best API Security Solutions for Business](https://cybersectools.com/shortlists/best-api-security-solutions) picks Akamai API Security, Salt Security Salt Collect, Cloudflare API Shield and 4 more. ## Side-by-side comparison | | Data Theorem API Security | @fastify/rate-limit | |---|---|---| | Pricing model | Commercial | Free | | Category | API Security | API Security | | Verified | No | No | | Deployment type | Hybrid | On-Premises | | Company size fit | SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise | | GitHub stars | – | 588 | | Last commit | – | Mar 2026 | | Company | Data Theorem | – | | Headquarters | – | – | ### Use cases and capabilities | | Data Theorem API Security | @fastify/rate-limit | |---|---|---| | Bot Protection | Yes | – | | DAST | Yes | – | | Web Security | – | Yes | ### Core features **Data Theorem API Security** 10 features listed. Sign in on the page to see them. **@fastify/rate-limit** No features listed. ### Integrations **Data Theorem API Security** 13 integrations listed. Sign in on the page to see them. **@fastify/rate-limit** No integrations listed. ## Which one fits you Based on what each listing shows: deployment, company size, price and open source. - [Data Theorem API Security](https://cybersectools.com/tools/data-theorem-api-security) fits if you need both cloud and on-premises options. - [@fastify/rate-limit](https://cybersectools.com/tools/fastifyrate-limit) fits if you need to run it on your own servers, you are a startup, you need a free product and you want an open-source product. ## Data Theorem API Security vs @fastify/rate-limit FAQ Common questions when comparing Data Theorem API Security vs @fastify/rate-limit for API security. ### What is the difference between Data Theorem API Security and @fastify/rate-limit? **Data Theorem API Security**: API security platform for discovery, testing, and runtime protection, built by Data Theorem. **@fastify/rate-limit**: A low overhead rate limiter for your routes. The table above shows where their features, integrations, deployment and company size fit differ. ### Who makes Data Theorem API Security and @fastify/rate-limit? **Data Theorem API Security** is made by Data Theorem. **@fastify/rate-limit** is open-source with 588 GitHub stars. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit. ### Is Data Theorem API Security a good alternative to @fastify/rate-limit? Often, yes. Data Theorem API Security and @fastify/rate-limit are both API Security products. Key differences: Data Theorem API Security is Commercial while @fastify/rate-limit is Free, @fastify/rate-limit is open-source. Use the table above to see where features, deployment and company size fit differ. ## Related comparisons - [Data Theorem API Security vs Indusface AppTrana - API Protection](https://cybersectools.com/compare/data-theorem-api-security-vs-indusface-apptrana-api-protection) - [Data Theorem API Security vs Ammune API Discovery](https://cybersectools.com/compare/ammune-api-discovery-vs-data-theorem-api-security) - [Data Theorem API Security vs Wallarm API Security](https://cybersectools.com/compare/data-theorem-api-security-vs-wallarm-api-security) - [@fastify/rate-limit vs Indusface AppTrana - API Protection](https://cybersectools.com/compare/fastifyrate-limit-vs-indusface-apptrana-api-protection) - [@fastify/rate-limit vs Ammune API Discovery](https://cybersectools.com/compare/ammune-api-discovery-vs-fastifyrate-limit) - [@fastify/rate-limit vs Wallarm API Security](https://cybersectools.com/compare/fastifyrate-limit-vs-wallarm-api-security) ## Alternatives to each - [See all Data Theorem API Security alternatives](https://cybersectools.com/alternatives/data-theorem-api-security) - [See all @fastify/rate-limit alternatives](https://cybersectools.com/alternatives/fastifyrate-limit) --- Source: https://cybersectools.com/compare/data-theorem-api-security-vs-fastifyrate-limit For AI agents: each product above has its own Markdown page (add .md to its URL, for example https://cybersectools.com/tools/data-theorem-api-security.md). Every CybersecTools shortlist is listed at https://cybersectools.com/shortlists.md. More on Data Theorem API Security and @fastify/rate-limit: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md