FireflyMobile VS NewPipe

One good open source solution is Firefly-III. Requires a web server. It works but is a bit of a PITA to keep up to date. You can use the importer to import bank csv files from your bank. There is 3rd party mobile app available.

It connect * TICE – Secure GPS Location Sharing with Friends (version 2.3): Meet up and locate your friends, family and colleagues on a map * PinPoi (version 1.7.6): Import and manage points of interest * Open TimeLimit (version 5.4.1): Simply limit the usage duration * Forkyz (version 15): Crossword puzzles application, download and play. * Tasks.org: Open-source To-Do Lists & Reminders (version 12.0): Fork of Astrid Tasks & To-Do List * RunnerUp (version 2.4.5.0): Track your sport activities using GPS * SaveTo… (version 1.15.2): Save shared image or pdf to selected directory * Simple Alarm Clock (version 3.10.03): Improved alarm clock * Discreet Launcher (version v5.4.1): Enjoy a clean home screen while accessing everything in an instant * Firefly III Mobile (version 5.0.1): Mobile wrapper for Firefly III * Ad-silence (version 0.4.0): Silence ads in Accuradio, Spotify & Tidal. Lightweight & minimal(under 150kb). * Meteocool - Rain radar (version 2.2): Free & Open High-Accuracy Local Weather Radar and Forecasting * Evil Insult Generator (version 3.3): This is the greatest insults app you can get! * ANOTHERpass (version 1.5.3): Another way to manage passwords * Simple Music Player (version 5.9.0): A clean music player with a customizable widget. * croc (version 1.10.1): Easily and securely send things from one computer to another * Look4Sat: Satellite tracker (version 2.6.0): Radio satellite tracker and pass predictor for Android * Bitcoin Wallet (version 9.03): Store digital currency * UnCiv (version 3.18.16): 4X civilization-building game * Termux:GUI (version 0.1.4): A plugin for Termux to use the Android GUI from terminal applications. * Bitcoin Wallet [testnet3] (version 9.03): Testing version of Bitcoin * Silence (version 1.9.2): Block unknown callers * Specie (version 1.01): Currency conversion * RadarWeather (version 4.6): Lets you watch the weather for cities and locations you are interested in. * Thorium a PeerTube client (version 1.11.0): a PeerTube player * Currency (version 1.40): Currency conversion * PCAPdroid (version 1.4.5): No-root network monitor and traffic dump tool for Android devices * GymRoutines (version 0.1.0-beta09): Open-Source fitness tracker for Android. * DeepL (version 7.1): Unofficial Android App for DeepL Translator * Etar - OpenSource Calendar (version 1.0.29): Etar is a material designed open source calendar, for everyone! * Catima — Loyalty Card Wallet (version 2.13.1): For your barcodes, memberships, loyalty programs, coupons and tickets.

Firefly III Mobile (version 4.13.0): Mobile wrapper for Firefly III

Just use NewPipe. It's just a better Youtube client even if it had ads.

https://newpipe.net/

I have a 3G device still able to watch YT and a very old Kindle Fire that has NewPipe [1] installed for watching YT in bed (whilst my phone is on charge).

I don't see why not either - if the device was capable of H264 when it was released, why not now?

[1] https://newpipe.net/

There is nothing you can do yourself as an app user, see https://github.com/TeamNewPipe/NewPipe/issues/9764. The current situation will be improved by https://github.com/TeamNewPipe/NewPipe/pull/10580.

NewPipe

NewPipe on Android is also unaffected.