iOS Privacy-first Fediverse Lightweight

MastoBlaster

A lightweight, privacy-first Fediverse client for iOS. MastoBlaster works with Mastodon, snac, GoToSocial, Akkoma, and any platform that implements the Mastodon API — with first-class support for snac, a minimalist ActivityPub server that most other clients overlook. It is not designed to please everyone. It is designed to work brilliantly for everyday Fediverse use.

Join TestFlight Features Compatibility Minimal UI, feature-rich behavior, and a focus on doing the right thing by default.

Privacy you can feel

Before media is uploaded, MastoBlaster strips EXIF metadata (with exceptions for HDR and orientation), so the instance never receives your original photo metadata.

On-device alt text assistance

Uses Apple Intelligence to generate alt text for your media, and can also help add alt text to media posted by others. Processing stays on device via Apple APIs on supported devices, and it is always optional.

First-class snac support

Most Fediverse apps treat snac as an afterthought. MastoBlaster follows snac's Mastodon API support closely, with Markdown posting, relay artifact cleanup, and proper character limit handling built in.

Small footprint, quick reactions

Designed to use very little storage and memory while running. Minimalism in size, not in capability.

Pricing policy: MastoBlaster will always be free for BSD Cafe users, illumos Cafe users, and for everyone connecting to a snac instance, including self-hosted ones.

Features

  • EXIF stripping for uploaded media (keeps HDR and orientation), so instances do not see your original photo metadata.
  • Apple Intelligence alt text generation for your uploads, plus optional help adding alt text to media that has none.
  • Broad Fediverse compatibility with Mastodon, snac, GoToSocial, Akkoma, and more.
  • snac-specific refinements: Markdown posting, "Boosted by Aoderelay" cleanup, and lifted character limits where applicable.
  • Markdown editor tailored for snac posting.
  • Granular notifications per account, with per-category control and notification grouping.
  • Multi-account support that simply works.
  • Mastodon essentials: lists, quote posts, and the main everyday features you expect.
  • Lightweight by design: tiny app size and minimal RAM usage.

Compatibility

MastoBlaster works with any software that implements the Mastodon API. This includes Mastodon itself, snac (a minimal, zero-dependency ActivityPub server), GoToSocial, Akkoma, and others. The goal is consistent, reliable behavior across the Fediverse - with extra attention given to snac, which rarely gets first-class treatment from client apps.

Public Beta is open. MastoBlaster is available for testing via TestFlight.
Join the beta on TestFlight.

For updates and feedback, follow @mastoblaster@mastoblaster.app.