LMQL vs Promptfoo
Side-by-side comparison · Updated April 2026
| Description | LMQL is a programming language tailored for large language models (LLMs). It offers robust and modular LLM prompting through the use of types, templates, constraints, and an optimizing runtime. It simplifies the creation of complex prompts by allowing procedural programming techniques in a query-like syntax. Created by the SRI Lab at ETH Zurich, LMQL supports features such as nested queries, scripted prompting, and custom constraints. It also provides a Playground IDE for ease of use. | Promptfoo is an open-source tool designed to ensure the security and reliability of LLM (Large Language Models) applications. It offers a comprehensive vulnerability scanner specifically tailored to each LLM product, providing customized probes for detecting PII leaks, unauthorized prompt manipulations, and other critical failures. With capabilities like caching, concurrency, and detailed vulnerability reports, Promptfoo allows developers to build, test, and refine LLM applications efficiently with test-driven development rather than trial-and-error. |
| Category | Other | SecurityApplication |
| Rating | No reviews | No reviews |
| Pricing | N/A | N/A |
| Starting Price | N/A | N/A |
| Use Cases |
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| Tags | programming languagelarge language modelstypestemplatesconstraints | open-sourcesecurityreliabilityLLMvulnerability scanner |
| Features | ||
| Nested Queries | ||
| Scripted Prompting | ||
| Custom Constraints | ||
| Optimizing Runtime | ||
| Playground IDE | ||
| Local Model Support | ||
| Tool Augmentation | ||
| High-level Constraint Management | ||
| Sequential Query Execution | ||
| Integration with Popular Libraries | ||
| Open-source | ||
| Customized vulnerability probes | ||
| Detection of PII leaks | ||
| Protection against unauthorized prompt manipulations | ||
| Prevention of jailbreaks | ||
| Detailed vulnerability reports | ||
| Support for multiple LLM API providers | ||
| Local operation without cloud dependencies | ||
| Test-driven LLM development | ||
| Community-supported | ||
| View LMQL | View Promptfoo | |