The main difference between LAMP and LAPP is the database software used.
LAMP stands for Linux, Apache, MySQL, and PHP/Perl/Python. On the other hand, LAPP stands for Linux, Apache, PostgreSQL, and PHP/Perl/Python.
LAPP is similar to LAMP in combining open-source software used for web development.
That said, LAPP uses PostgreSQL instead of MySQL, which is known for its scalability and reliability. On top of that, PostgreSQL supports more complex data types and advanced features than MySQL, making it a popular choice for enterprise-level applications.