Yes. Whether it is the official Google Camera or a community MOD, it is completely free. Be wary of any site asking for payment—it is a scam.
: The gallery preview and front/rear camera switcher buttons have been swapped. Installation & Compatibility camera version 9.0 21.0 download
Here’s a balanced, informative review for (note: the version in your query appears to have a space; I assume you meant 9.0.21.0 , likely for a Google Pixel or similar Android device). : The gallery preview and front/rear camera switcher
Devices with Kirin chips (Huawei) or older Exynos processors (pre-2022) may crash or lack features like Night Sight. | Source | Link / How to find
| Source | Link / How to find | |--------|--------------------| | | celsoazevedo.com → search “9.0.21.0” | | XDA Developers Forums | Search “GCam 9.0.21.0 + your device model” | | BSG, BigKaka, Shamim GCam builds | Look for package name like GCam_9.0.21.0_XXX.apk |
For non-Pixel devices, Celso Azevedo maintains the largest GCam port database.