It uses Kythe, a Google-internal technology for indexing codebases.
Query symbols, file paths, and definitions across hundreds of Git repositories simultaneously. Top Free Alternatives to the Original AndroidXRef
: Another community resource providing a classic OpenGrok interface for navigating various AOSP branches. 💡 Pro Tips for Searching Master vs. Tagged cs.android.com xref aosp free
See all the places a specific function is called.
To get the most out of the free search engine, developers use specialized search syntax: It uses Kythe, a Google-internal technology for indexing
Do you need to index , or just the clean Google AOSP? What hardware specs (RAM/Storage) do you have available?
Traditionally, system engineers and custom ROM developers had to download hundreds of gigabytes of source data just to trace a single framework call. Today, multiple free XRef AOSP platforms allow you to browse, search, and jump through the entire Android ecosystem directly from your web browser. 💡 Pro Tips for Searching Master vs
For most users looking for a tool in 2026, cs.android.com is the superior choice. It provides the most accurate and up-to-date cross-references directly from Google's developers.
Application developers often look "under the hood" at the Android Framework ( /frameworks/base ) to understand undocumented APIs or debug system-level crashes.
Using these tools is refreshingly simple and doesn't require a user account or any configuration. Here's a basic workflow: