ZapFast: A fast, native WhatsApp client in Rust and egui

handfuloflight 34 points 16 comments November 08, 2026
github.com · View on Hacker News

Discussion Highlights (7 comments)

tombh

In their own README: > Using an unofficial client may be against WhatsApp's terms of service and could get an account suspended. Same for all of these unofficial clients.

aeontech

Looks great, but... how can one trust it with credentials/communication? (nothing against the developer, more the principle of the thing)

nianzhibai

It's a bit basic. I installed it and then uninstalled it.

codedokode

Egui is pretty bad idea. It uses "immediate mode" rendering which means whole window is redrawn on every mouse move. I ran PhotoCraft (built in Rust + egui) in a VM wihout a GPU and the UI felt like it was running on 3 fps. If you use egui, try running it without a GPU before releasing. Egui is definitely not what you want to use on a 4K screen. It is only good for tiny screens of embedded devices. Why there is no reactive UI that tracks all dependencies and redraws only what needs to be redrawn? (not React, it also re-calculates (but not redraws) everything on every change). Also why does it visually look like bad version of Telegram? And Telegram can run without a phone present.

loremdifr

dont get me wrong, I like the extra performance, but every single alternative whatsapp client has the same issue where it's missing enough core features that you end up needing to go to the browser version often enough to be a nuisance and I end up just using the browser instead (which I hate, I really really would prefer a performant client instead!)

codedokode

Also, I looked at how dates are written in a screenshot and thought that "2 days ago" would be so much better than "Tuesday". Because you do not have to compute in your head how many days ago Tuesday was.

dangoodmanUT

it seems like we're entering the next phase of "written in rust": UIs

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