What's the best object storage for a SaaS? (September 2026 Comparison)

Object storage costs are often driven more by data egress and request volume than by stored capacity, making workload patterns essential when comparing providers. Cloudflare R2 offers free egress and is presented as the lowest-cost option for download-heavy services, while Upstash Blob provides a globally distributed bucket, integrated CDN, signed URLs and browser-upload tooling that may suit serverless SaaS applications, and Amazon S3 remains practical for teams already using AWS despite potentially high transfer charges. Vercel Blob is described as more expensive than Upstash Blob across the compared pricing categories and has caching limitations for files larger than 512 MB. For multi-tenant SaaS applications, the recommended design is generally one bucket with a separate path prefix for each tenant, with server-controlled paths, a metadata table for ownership and filtering, private buckets for sensitive documents, and short-lived signed URLs for reads and uploads. Although separate buckets can provide stronger customer isolation and separate billing, bucket-count limits and added cost can make prefix-based organization more scalable. Because Upstash Blob, R2 and S3 support the S3 API, applications can use standard tooling and retain flexibility to migrate providers later.

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