The constant of pi, πLex

πLex is a local AI case management tool specifically designed for lawyers. Once you import a bunch of case documents, it will organize the facts, evidence, key points of contention, and timelines. Each conclusion will be clearly labeled with the source document and the specific section where the information comes from, making it extremely convenient to review later on. For lawyers, this feature is far more important than being able to “write quickly”.

Drafting complaint documents and legal letters, carefully reviewing the risks associated with each clause of a contract, and comparing the differences between two versions of the same document are all common tasks that can be easily completed. Moreover, the deadline for filing a lawsuit can also be automatically added to the calendar.

Its approach is relatively conservative: case data is only stored locally, and it is automatically anonymized before being sent to cloud-based large models. Users need to obtain their own API Keys to use these models; services such as DeepSeek, Tongyi, OpenAI, and Kimi all support this functionality. Currently, the official website offers a Windows version for download, making it suitable for law firms and individual lawyers who are particularly concerned about the issue of data transfer outside their systems.