A simple, cross-platform password manager using python+kivy. Portable for desktop and android.
Hydra can create, read, and edit AES-encrypted password file containers on disk. There's currently no cloud integration; I simply use Google Drive (or whatever app you like) to manage the password file(s) and push/pull with my desktop/laptops/phones, since Drive is locked down to your Google account and the files are AES encrypted in addition.
Considering automating this feature, but I find that after the initial creation and adding all my common sites, I really don't update the password files all that often.
For best use, encrypt your password file(s) with a strong, unique password. Back up your password file(s) to make sure you don't lose them. I use Google Drive, personally, to manage the password file between my desktop/laptop/android devices - but really, you should make sure the password file(s) you use are secure and backed up regularly.
I have working versions of the python source code, a .exe (Windows Installer), and Android APK file available in the Releases.
In Windows you can run the app installer to make life easy, or simply use the .py, .kv files if you're comfortable with Python. On Android, you'll want to install the APK file.
If you don't already have a hydra password file, your first run you'll want to create one, and use a good password to secure it (these are the keys to the kingdom, after all). I like to end them in ".hydra" (for example: secure.hydra, pass.hydra, etc.) but that's currently not enforced. Then create as many sites/services as you like; every time you click "New Password" it will ask you the name of the account/site/service and password length to generate (I suggest using the maximum allowed by the account/site/service; usually 15-30). Hydra will create a unique, random, secure password.
Nothing is stored on disk until you click "Save File". Clicking "Exit" will leave a previously opened file exactly how it was, and negate creating a new file.
Download the executable in the current release on GitHub. It's a simple installer file, and will place the required files in C:\Program Files\Hydra by default, and create shortcuts on both the desktop and start menu.
The kivy website has the best information (read it all - it will make your life simpler).
You'll also need Visual Studio build tools for C++. They can be found on Microsoft's website.
Lastly, you'll want to make sure you have the requisite packages;
python -m pip install -r requirements.txt
Building for Windows is currently using PyInstaller (to turn the python3 code into a .exe), and a trial version of Advanced Installer (to package everything up and create the installer file).
If you install the APK file on your phone, you'll need to enable developer options. Then you should be able to tap the APK using your file system app and install it (you may be prompted about installing apps from unknown sources).
I plan to eventually get it on the Play Store...eventually...until then you'll have to manually install
Buildozer's documentation is pretty good, and should get you more than started.
You'll need some kind of 'nix (Linux/BSD/etc. type system) to build for Android. I'm doing it in Windows 10 using the Windows Subsystem for Linux (WSL) and Ubuntu 20.04. It's worth reading up on the Buildozer Documentation for Windows 10 and the Microsoft WSL documentation.
The hydra/ folder has the associated main.py and main.kv (kivy) file. You'll want to make sure the following are installed first:
python -m pip install --upgrade pip wheel setuptools
python -m pip install functools kivy
Additionally, because this stores files AES-encrypted, you'll need either pycrpto or pycryptodome (either works):
python -m pip install pycryptodome
Just run the code like you would any other python script:
python main.py
Most of the code is all about the GUI, and the bulk of the size of the compiled packages are because of dependencies (kivy for the GUI, Microsoft Visual C++, python interpreter, etc.).
That said, the core of the program essentially creates/decrypts a file on disk assumed to be an AES-encrypted pickle file, loads it into memory as a python dictionary and allows you to interact with it (by creating new passwords, deleting old ones, etc.). When finished, if you clicked "save" the app will save the dictionary back to a pickle and re-encrypt it (if you clicked save), and if you cliked "exit" the original encrypted file is unmodified.
That's...really all there is to it. I did say it was a simple password manager :).