Hash Lab is a free in-browser workbench for hash functions. This guide shows how to watch the avalanche effect, time SHA-256 against Argon2id, read stored hash strings and verify files and webhooks.
PBKDF2 is not deprecated, but it is no longer the recommended default for new systems. Here is the honest, practical answer for developers: when PBKDF2 is still acceptable, when you should reach for Argon2id instead, and how to decide for your system.