We should make a compatibility matrix of MastoAPI clients’ feature support beyond vanilla Mastodon. All these clients support sending + rendering reactions:

Web/PWA:

- Whalebird, Fedistar: quotes I think?
- Enafore: quotes, MFM, different posting mimetypes (Markdown, HTML, BBCode, HTML, MFM), bubble timeline
- Mangane: quotes, MFM, different posting mimetypes
- Phanpy (?)

Android:

- Megalodon + Moshidon

iOS:

- Feditext: partial support for rendering quotes.

Flutter:

- Kaiteki: Markdown, maybe posting with different mimetypes?

I know of no clients with reaction support for Freedesktop, macOS, or Windows.

I’ll edit this post as more people make suggestions.