If you're looking for a free alternative to Firebase Cloud Storage, here are some great options that offer free tiers or open-source solutions:

1. Supabase Storage

  • Free Tier: 1 GB storage + 2 GB bandwidth/month
  • Features:
    • S3-compatible object storage
    • Built-in CDN
    • File resizing & transformations
    • Integrates with Supabase Auth & Postgres
  • Website: supabase.com/storage

2. Backblaze B2 Cloud Storage

  • Free Tier: 10 GB storage + Free outbound bandwidth (1 GB/day)
  • Features:
    • S3-compatible API
    • Low-cost storage ($0.005/GB/month)
    • Integrates with Cloudflare for free egress
  • Website: backblaze.com/b2

3. Cloudflare R2 Storage

  • Free Tier: 10 GB storage + 1M operations/month
  • Features:
    • Zero egress fees (no cost for downloads)
    • S3-compatible API
    • Built-in CDN
  • Website: cloudflare.com/r2

4. Storj (Decentralized Storage)

  • Free Tier: 25 GB storage + 25 GB bandwidth/month
  • Features:
    • Decentralized, S3-compatible storage
    • High durability & privacy
  • Website: storj.io

5. MinIO (Self-Hosted S3 Alternative)

  • Free & Open-Source (Unlimited if self-hosted)
  • Features:
    • S3-compatible API
    • High performance
    • Can be deployed on any cloud or on-premise
  • Website: min.io

6. Wasabi Hot Cloud Storage

  • Free Tier: 1 TB free for 30 days (then pay-as-you-go)
  • Features:
    • No egress fees
    • S3-compatible
  • Website: wasabi.com

Best Choice?

  • For Firebase-like experience → Supabase
  • For cheapest cloud storage → Backblaze B2 or Cloudflare R2
  • For privacy & decentralization → Storj
  • For self-hosting → MinIO