I just released a small iOS and iPadOS app called Internet Speed Limiter. It lets you slow down your device's entire internet connection directly on the phone or iPad. No Mac required, no Xcode Network Link Conditioner, no proxies or complicated setup.
Most of us test apps on fast Wi-Fi or strong cellular, but actual users often face slow 3G, weak signals, or bad hotel networks. This app lets you reproduce those conditions right where you are developing. You choose a profile like Slow, Medium and Fast or set your own bandwidth. Flip the switch and everything on the device, your app, Safari, whatever, starts feeling the throttle. It works through a local VPN profile so it affects the whole system.
You can find it on the App Store here: https://apps.apple.com/us/app/internet-speed-limiter/id67601... I would love to hear questions, feedback and/or feature requests. If you give it a try and something works great or breaks badly, tell me. I am around to chat.
Thanks for reading! Jay