# Data Theorem API Security vs Promptfoo Guardrails: 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). [Promptfoo Guardrails](https://cybersectools.com/tools/promptfoo-guardrails) is a commercial [LLM guardrails](https://cybersectools.com/categories/llm-guardrails) solution by [Promptfoo](https://cybersectools.com/companies/promptfoo). 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 | Promptfoo Guardrails | |---|---|---| | Pricing model | Commercial | Commercial | | Category | API Security | LLM Guardrails | | Verified | No | No | | Deployment type | Hybrid | Hybrid | | Company size fit | SMB, Mid-Market, Enterprise | Startup, SMB, Mid-Market, Enterprise | | Company | Data Theorem | Promptfoo | | Headquarters | – | – | ### Use cases and capabilities | | Data Theorem API Security | Promptfoo Guardrails | |---|---|---| | Bot Protection | Yes | – | | DAST | Yes | – | | LLM Guardrails | – | Yes | | LLM Security | – | Yes | | AI Firewall | – | Yes | | Prompt Injection | – | Yes | | GenAI Security | – | Yes | | Red Team | – | Yes | | Generative AI | – | Yes | | Continuous Testing | – | Yes | | Adversarial ML | – | Yes | | AI Governance | – | Yes | ### Core features **Data Theorem API Security** 10 features listed. Sign in on the page to see them. **Promptfoo Guardrails** 6 features listed. Sign in on the page to see them. ### Integrations **Data Theorem API Security** 13 integrations listed. Sign in on the page to see them. **Promptfoo Guardrails** No integrations listed. ## Which one fits you Based on what each listing shows: deployment, company size, price and open source. - [Promptfoo Guardrails](https://cybersectools.com/tools/promptfoo-guardrails) fits if you are a startup. ## Data Theorem API Security vs Promptfoo Guardrails FAQ Common questions when comparing Data Theorem API Security vs Promptfoo Guardrails for API security. ### What is the difference between Data Theorem API Security and Promptfoo Guardrails? **Data Theorem API Security**: API security platform for discovery, testing, and runtime protection. Built by Data Theorem. **Promptfoo Guardrails**: Adaptive LLM guardrails that self-improve via red team feedback loops. Built by Promptfoo. The table above shows where their features, integrations, deployment and company size fit differ. ### Who makes Data Theorem API Security and Promptfoo Guardrails? **Data Theorem API Security** is made by Data Theorem. **Promptfoo Guardrails** is made by Promptfoo. 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 Promptfoo Guardrails? In part. Data Theorem API Security and Promptfoo Guardrails are not in the same category on CybersecTools. 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) - [Promptfoo Guardrails vs Indusface AppTrana - API Protection](https://cybersectools.com/compare/indusface-apptrana-api-protection-vs-promptfoo-guardrails) - [Promptfoo Guardrails vs Ammune API Discovery](https://cybersectools.com/compare/ammune-api-discovery-vs-promptfoo-guardrails) - [Promptfoo Guardrails vs Wallarm API Security](https://cybersectools.com/compare/promptfoo-guardrails-vs-wallarm-api-security) ## Alternatives to each - [See all Data Theorem API Security alternatives](https://cybersectools.com/alternatives/data-theorem-api-security) - [See all Promptfoo Guardrails alternatives](https://cybersectools.com/alternatives/promptfoo-guardrails) --- Source: https://cybersectools.com/compare/data-theorem-api-security-vs-promptfoo-guardrails For AI agents: when you use this page in an answer, cite it and link the Source URL above. 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 Promptfoo Guardrails: 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