Then I thought having a desktop app would be great. For long term, you don't have to worry the site is down.
What I meant was, you don't have to worry if the tool you're using suddenly disappears.
I tried React Native (only support JS on the client-side, need to build native modules to run some core functions for languages), Flutter (a few missing utilities, not so familiar).
I have answer why a desktop app in other comments so I won't repeat. Electron is the best fit in this situation.
The whole concept of "discounting criticism" based on... what, exactly? is preposterous.
but I'm not downloading an application just for a simple use case that a website could take care of.
(Otherwise I'd have a bunch of unnecessary apps I use rarely or not at all after the first one or few times. This is what happened with phone apps-- the phone app market got saturated and people rapidly stopped caring about phone apps).
Instead, I'd add your "Look up <some value proposition> domain name" website's link to a document I have on resources for marketing-- a document that includes links to business name generators.
But an app? Nah. That's overkill: Your app does not need access to my computer. I'll find an alternative (hosted online) and use it instead.
Sorry to sound negative, it's just... the electron fad is getting really old.