The short list

1. Aminoka — closest structural match. Free.
2. Discord — chat-driven communities. Free.
3. Reddit — asynchronous thread communities. Free.
4. Tumblr — roleplay + shipping personal-blog communities. Free.
5. Telegram — large-scale chat-only groups. Free.
6. Guilded — Discord with a calendar. Free.
7. Facebook Groups — works structurally, wrong audience. Free.
8. Mighty Networks — closest paid alternative. From $39/mo.

Why "similar" matters

Most Amino refugees don't want a Discord that pretends to be Amino with bots strapped on. They want an app where the mental model just works — where joining a community gives you a profile inside it, where the community has leaders with mod powers, where you can write a wall post and have people see it without re-engineering the whole concept.

Of the 8 apps below, only Aminoka was built with that mental model intact.

The 8 apps, in order of similarity

1. Aminoka — built as a direct replacement

Aminoka was designed specifically to feel like Amino did. The UI uses the same community → profile → wall layout. The role names (leader, curator, host) are identical. Levels, polls, walls, public + private chats all work the way they did on Amino. The differences are improvements: the chat is sub-100ms (Cloudflare edge), the moderation is OpenAI-backed, there is a built-in roleplay matchmaker and OC library, and the team ships daily updates. Full feature comparison here.

2. Discord — similar at the chat layer

Discord nails the chat half of what Amino did. Voice channels and bots make it superior to Amino's chat tooling. What it doesn't have: real member profiles, leveling without third-party bots, wall posts as a first-class concept, public community discovery. About 70% of Amino refugees defaulted to Discord and ~half of their communities lost members in the move because the structure they relied on disappeared.

3. Reddit — similar at the post layer

Subreddits and Amino communities share the topic-based join model. Reddit posts can be substantively long, threaded, voted-on, archived. The miss: zero member profile depth, no live chat (Reddit Chat is functionally abandoned), no leader hierarchy beyond mod tags.

4. Tumblr — similar at the personal-blog and roleplay layer

If your Amino was 90% roleplay or shipping content, Tumblr is genuinely good. Custom themes per blog give every character or persona a unique page. The follow + reblog graph turns into a partner network organically. The miss: no community structure. Each Tumblr is an island.

5. Telegram — similar at the large-group-chat layer

Telegram public groups handle thousands of members per chat without breaking. Best when your community is purely chat at large scale. Misses everything outside chat.

6. Guilded — Discord with a calendar

Owned by Roblox. Adds scheduling and event tools on top of a Discord-style channel layout. Outside gaming-LFG it sees almost no adoption.

7. Facebook Groups — similar in shape, wrong demographic

Mechanically Facebook Groups has walls, polls, events, and decent moderation. The reason it ranks low is the median Amino refugee will not install Facebook — demographic mismatch is fatal for these communities.

8. Mighty Networks — similar at the paid creator-community layer

Closest paid alternative to Amino's structural model. Has named "Hosts", events, course modules. Starts at $39/month and is built for paid memberships, which makes it overkill for free fandom communities.

Which one should you actually pick?

If your Amino community was structure-driven (profiles, walls, leveling, leader hierarchy) — pick Aminoka. If it was chat-driven — pick Discord and pair it with Aminoka for the profile layer. If it was thread-driven — Reddit. If it was roleplay-driven — Aminoka or Tumblr.

Most communities that successfully moved post-Amino run two apps: Aminoka for the structure + Discord for high-velocity chat. That combination matches what Amino used to do in one app. Step-by-step migration guide.