Hollo

What it does

Accounts

One instance can host multiple accounts, which users can switch between.checked 12 Oct 2026

Audience

Hollo is designed for individual users and personal microblogs, notes, and journals; it can host multiple accounts on one instance.checked 5 Oct 2026

Client access

Hollo has no web app of its own and provides a Mastodon-compatible API for use with Mastodon clients.checked 12 Oct 2026

Client API

Hollo is headless and implements the Mastodon API, so users interact through compatible client apps rather than a built-in web interface.checked 5 Oct 2026

Client limitations

The tested-client notes say Elk does not support emoji reactions and treats quotes as write-only; Phanpy reactions are read-only.checked 5 Oct 2026

Client support

The maker lists tested web, Android, and iOS clients, including Phanpy, Moshidon, Mona, and Woolly, while noting some client features may not work as expected.checked 5 Oct 2026

Core features

Hollo supports hashtags, mentions, media attachments, polls, sharing and favoriting posts, and Misskey-style emoji reactions.checked 5 Oct 2026

Deployment

Hollo can be deployed to Railway, with Docker, or manually on a server.checked 5 Oct 2026

Federation

Hollo implements ActivityPub and interoperates with Mastodon, Misskey, Akkoma, WordPress, and Threads.checked 12 Oct 2026

Installation

The maker documents deployment through Railway, Docker, or manual installation from source.checked 12 Oct 2026

License

Hollo is distributed under the GNU Affero General Public License version 3 or later.checked 12 Oct 2026

Notable limitation

Hollo is designed for single-user instances and omits moderation tools intended for shared instances.checked 12 Oct 2026

Posting features

Hollo supports polls, media attachments, hashtags, mentions, FEP-044f quote posts, and Misskey-style emoji reactions.checked 12 Oct 2026

Privacy controls

Hollo can proxy or cache remote media through its own origin, with SSRF checks and a 32 MiB body cap in proxy and cache modes.checked 5 Oct 2026

Product

Hollo is a single-user federated microblogging tool for running a personal server.checked 5 Oct 2026

Quotes

Hollo supports FEP-044f-compliant quotes in Misskey-style and Mastodon-style implementations.checked 5 Oct 2026

Requirements

Hollo requires PostgreSQL and a place to store media.checked 12 Oct 2026

Security

Hollo supports passkeys, TOTP two-factor authentication, OAuth 2.0 with PKCE, and CSRF protection on cookie-authenticated routes.checked 12 Oct 2026

Security configuration

Hollo requires a session secret key of at least 44 characters, and its documentation warns that enabling the Fedify debugger in production exposes internal trace data.checked 5 Oct 2026

Storage

Media can be stored on the local filesystem or S3-compatible object storage.checked 12 Oct 2026

Supported networks

Mastodon,Misskey,Akkoma,WordPress,Threads,and other ActivityPub-compatible serviceschecked 23 Sep 2026

What it does

Hollo is a self-hosted, single-user microblogging server for the fediverse.checked 12 Oct 2026

Writing

Posts support CommonMark and can be up to 10,000 characters long.checked 12 Oct 2026