# Data Theorem API Security vs Qualys TotalAppSec: 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). [Qualys TotalAppSec](https://cybersectools.com/tools/qualys-totalappsec) is a commercial [dynamic application security testing](https://cybersectools.com/categories/dast) solution by [Qualys](https://cybersectools.com/companies/qualys). Features, integrations, deployment and the company behind each one, side by side. ## Our take What our shortlists say about the one we picked. ### [Qualys TotalAppSec](https://cybersectools.com/tools/qualys-totalappsec) Best for: Enterprises consolidating DAST with Qualys VM and cloud asset inventory The limitation is that TotalAppSec delivers the most value when you are already in the Qualys ecosystem, specifically running Qualys CSAM or VMDR. The integrations with those products are native and tight. As a standalone DAST solution evaluated in isolation, the complexity of the platform may outweigh the benefits for teams without existing Qualys investment. This is an enterprise play, and it is priced and scoped accordingly. From [Best DAST Solutions for Business](https://cybersectools.com/shortlists/best-dast-solutions), Fall 2026. Reviewed by [Nika (Nikoloz) Kokhreidze](https://cybersectools.com/about). 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 | Qualys TotalAppSec | |---|---|---| | Pricing model | Commercial | Commercial | | Category | API Security | Dynamic Application Security Testing | | Verified | No | No | | Deployment type | Hybrid | Cloud | | Company size fit | SMB, Mid-Market, Enterprise | SMB, Mid-Market, Enterprise | | Company | Data Theorem | Qualys | | Headquarters | – | – | ### Use cases and capabilities | | Data Theorem API Security | Qualys TotalAppSec | |---|---|---| | Bot Protection | Yes | – | | DAST | Yes | Yes | | OWASP | – | Yes | | PII | – | Yes | | Web Security | – | Yes | ### Core features **Data Theorem API Security** 10 features listed. Sign in on the page to see them. **Qualys TotalAppSec** 10 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. **Qualys TotalAppSec** 20 integrations listed. Sign in on the page to see them. ## 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. - [Qualys TotalAppSec](https://cybersectools.com/tools/qualys-totalappsec) fits if you want a cloud product. ## Data Theorem API Security vs Qualys TotalAppSec FAQ Common questions when comparing Data Theorem API Security vs Qualys TotalAppSec for API security. ### What is the difference between Data Theorem API Security and Qualys TotalAppSec? **Data Theorem API Security**: API security platform for discovery, testing, and runtime protection, built by Data Theorem. **Qualys TotalAppSec**: Cloud-based DAST solution for web app & API security with AI-powered scanning, built by Qualys. The table above shows where their features, integrations, deployment and company size fit differ. ### Who makes Data Theorem API Security and Qualys TotalAppSec? **Data Theorem API Security** is made by Data Theorem. **Qualys TotalAppSec** is made by Qualys. 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 Qualys TotalAppSec? In part. Data Theorem API Security and Qualys TotalAppSec are not in the same category on CybersecTools. Both cover DAST. 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 Imperva API Security](https://cybersectools.com/compare/data-theorem-api-security-vs-imperva-api-security) - [Data Theorem API Security vs Ammune API Discovery](https://cybersectools.com/compare/ammune-api-discovery-vs-data-theorem-api-security) - [Qualys TotalAppSec vs Indusface AppTrana - API Protection](https://cybersectools.com/compare/indusface-apptrana-api-protection-vs-qualys-totalappsec) - [Qualys TotalAppSec vs Imperva API Security](https://cybersectools.com/compare/imperva-api-security-vs-qualys-totalappsec) - [Qualys TotalAppSec vs Ammune API Discovery](https://cybersectools.com/compare/ammune-api-discovery-vs-qualys-totalappsec) ## Alternatives to each - [See all Data Theorem API Security alternatives](https://cybersectools.com/alternatives/data-theorem-api-security) - [See all Qualys TotalAppSec alternatives](https://cybersectools.com/alternatives/qualys-totalappsec) --- Source: https://cybersectools.com/compare/data-theorem-api-security-vs-qualys-totalappsec 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 Qualys TotalAppSec: 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