LATdx
LATdx runs your Apex tests on your org, fingerprints the code each test reaches, and reuses the last result while that fingerprint is unchanged.
LATdx is a caching test runner for Salesforce Apex. It runs on top of the sf CLI auth and sfdx-project.json workspace you already have. With Java 11 or newer and the LATdx daemon running (the normal setup), it stores each test result with a fingerprint of the Apex that test reaches through static calls plus your project’s tracked metadata; without them, keys fall back to one per test class. On the next run, tests whose fingerprint changed run on the org, and unchanged tests can reuse their last result. Code called by name at runtime is not traced; see Test Result Caching for what the fingerprint covers and when to use --force.