Cloudflare R2 vs AWS S3: Zero-Egress Storage Economics & Multi-Cloud Architecture
S3-compatible object storage with $0 egress fees versus AWS standard data transfer pricing
Cloudflare R2 provides full S3 API compatibility with zero egress bandwidth charges and lower per-gigabyte monthly storage costs ($0.015/GB vs $0.023/GB on AWS S3 Standard). AWS S3 offers deeper integration with AWS analytic services (Athena, Glue, Redshift) and complex lifecycle tiers (Glacier Deep Archive), but penalizes external traffic with steep $0.09/GB egress transfer fees.
Technical Tradeoff & Benchmark Matrix
| Cost & Operational Metric | Cloudflare R2 | AWS S3 Standard |
|---|---|---|
| Storage Rate per GB-mo | $0.015 / GB-month | $0.023 / GB-month (first 50 TB) |
| Internet Egress Bandwidth | $0.00 / GB (Always Free) | $0.09 / GB (after 100 GB tier) |
| Class A Operations (Writes) | $4.50 per 1,000,000 requests | $5.00 per 1,000,000 requests (PUT/COPY/POST) |
| Class B Operations (Reads) | $0.36 per 1,000,000 requests | $0.40 per 1,000,000 requests (GET/HEAD) |
| Free Tier Allowance | 10 GB storage, 1M Class A, 10M Class B monthly | 5 GB storage, 20K GET, 2K PUT for 12 months only |
| Edge Integration | Direct zero-latency Workers binding (env.BUCKET.get) | Requires signing AWS Signature v4 over HTTPS |
Interactive Calculation Engines
Calculate empirical values directly using our zero-latency edge computational models:
Frequently Asked Questions & Technical Analysis
Q: Can applications migrate from AWS S3 to Cloudflare R2 without code rewrites?
Yes. R2 implements the S3-compatible API. Existing SDKs (AWS SDK for JavaScript, Boto3 for Python, Go SDK) require only updating the endpoint URL to Cloudflare's account endpoint and providing R2 access credentials.
Q: What is the primary financial tipping point where R2 outperforms S3?
Any application that downloads or distributes more than 20% of its stored volume per month saves substantially on R2 due to the total elimination of AWS's $0.09/GB egress fee.