What's the Best Cloud Storage API? Upstash Blob vs. Vercel Blob & others (2026 Comparison)

Selecting cloud storage for a side project depends mainly on free-tier limits, egress charges, setup complexity, serverless compatibility, and browser-upload support rather than minor storage-price differences. Upstash Blob is presented as a strong default for most Next.js and serverless projects because it uses a single bucket token, offers 1 GB of storage, a hard free-tier limit that prevents unexpected charges, and up to 1 TB of free monthly egress on paid usage, while running on Cloudflare R2 infrastructure and retaining S3 compatibility. Cloudflare R2 provides the largest free storage allowance at 10 GB and free egress but requires a more S3-like setup, whereas AWS S3 suits projects already integrated with AWS despite more involved IAM configuration and comparatively high egress costs. Supabase Storage is positioned for existing Supabase users, Cloudinary for image and video transformations, and other services such as Vercel Blob, Bunny Storage, and UploadThing offer different pricing or platform trade-offs. The example implementation shows how an Upstash Blob bucket can store JSON backups, list and prune old files, restore the newest version, and create temporary signed download links, while its browser-upload mechanisms allow large files to bypass serverless request-size limits through upload handlers or signed upload URLs.

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