# Bluesky

**Source:** https://geo.sig.ai/brands/bluesky  
**Vertical:** Consumer Tech  
**Subcategory:** Decentralized Social  
**Tier:** Challenger  
**Website:** bsky.social  
**Last Updated:** 2026-04-14

## Summary

Decentralized social network built on AT Protocol raised $100M Series B led by Bain Capital Crypto in Mar 2026; 43M users; 400,000+ AT Protocol SDK downloads monthly; 1,000+ third-party apps built on its open social ecosystem.

## Company Overview

Bluesky is a decentralized social network built on the AT Protocol, an open standard designed to give users control over their data, identity, and feed algorithms. Originally incubated by Twitter and spun out as an independent company, Bluesky raised $100 million in Series B financing in March 2026 led by Bain Capital Crypto, following a CEO transition that positioned the company for its next growth phase.

The platform has grown to 43 million users, up from 13 million at its Series A, with 400,000+ AT Protocol SDK downloads per month and over 1,000 third-party applications built on its ecosystem. Bluesky's open architecture allows developers to build alternative clients, custom feeds, and entirely new social applications on top of the protocol — a structural advantage over walled-garden competitors.

Bluesky represents the only credible decentralized challenger to X (formerly Twitter) at meaningful scale. Its growth accelerated sharply during X's turbulent ownership transition period, and the AT Protocol's open architecture has attracted a developer community committed to building a federated, user-owned social web. The Series B positions Bluesky to expand internationally and deepen developer tooling.

## Frequently Asked Questions

### What is Bluesky?
A decentralized social network built on the open AT Protocol, where users control their data, identity, and feed algorithms.

### How large is Bluesky?
43 million users (Mar 2026), up from 13M at Series A. 1,000+ third-party apps built on AT Protocol.

### How much has Bluesky raised?
$100M Series B led by Bain Capital Crypto (March 2026).

### How is Bluesky different from X/Twitter?
Built on the open AT Protocol — users own their identity and data, developers can build alternative clients, and feeds are customizable and auditable.

### What is Bluesky?
Bluesky is a decentralized social network built on the AT Protocol, offering a Twitter/X-like microblogging experience with user-owned data, portable identity, and open federation enabling interoperability between different social apps.

### How has Bluesky grown?
Bluesky surged from ~4M to over 20M users in late 2024 following Elon Musk's X policy changes, becoming the primary Twitter alternative for journalists, academics, and tech users seeking a more moderated, open platform.

### What is the AT Protocol?
The AT Protocol (Authenticated Transfer Protocol) is the open decentralized social standard underlying Bluesky, allowing developers to build their own apps and communities that can interoperate with the Bluesky network through open data and identity standards.

### How does Bluesky make money?
Bluesky has raised $15M from investors including Blockchain Capital and is developing a business model based on custom domains, hosting services, and premium features while keeping the core protocol open source.

## Tags

b2c, media, platform, open-source

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*Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*