Comparing the reigning enterprise cloud storage standard against Cloudflare's zero-egress challenger. Analyze storage gigabyte pricing, outbound bandwidth penalties, API operation rates, and S3 SDK interoperability.
Calculate your real cloud storage invoice comparing AWS S3 egress taxes versus Cloudflare R2 zero-egress.
Evaluating architecture specifications, benchmark rates, throughput latency, and pricing tiers.
| Dimension | Cloudflare R2 | Amazon S3 | Key Takeaway / Advantage |
|---|---|---|---|
| Storage Cost per TB/Month | $15.00 / TB | $23.00 / TB | Cloudflare R2 (35% cheaper) |
| Egress Bandwidth per TB | $0.00 / TB (Always free) | $90.00 / TB ($0.09/GB) | Cloudflare R2 (100% free) |
| Class A / Write Operations (1M) | $4.50 | $5.00 | Cloudflare R2 (-10%) |
| Class B / Read Operations (1M) | $0.36 | $0.40 | Cloudflare R2 (-10%) |
| Archive / Cold Storage Tier | None (Single hot tier) | S3 Glacier Deep Archive ($0.99/TB) | Amazon S3 |
| S3 SDK Interoperability | High (boto3, aws-cli, rclone) | Native original protocol standard | Tie |
| Compliance & Security | SOC2, HIPAA, ISO27001 | FedRAMP High, DoD IL5, PCI-DSS | Amazon S3 |
For web applications, AI model checkpoint distribution, media streaming, and mobile app backends, Cloudflare R2 is vastly superior to Amazon S3. AWS S3's notorious $0.09 per gigabyte outbound data transfer fee ($90 per Terabyte) turns high-traffic applications into financial liabilities. In contrast, R2 charges zero egress fees and has a lower base storage rate ($0.015/GB vs $0.023/GB), slashing overall cloud storage bills by 70% to 95%.
The only scenario where Amazon S3 remains essential is compliance-driven deep archival and complex AWS analytics ecosystems. If you need to store hundreds of terabytes of cold audit logs that will almost never be downloaded, S3 Glacier Deep Archive at $0.00099/GB ($0.99/TB/month) is 15x cheaper than R2. Furthermore, organizations deeply entrenched in AWS Lake Formation, Athena, and EMR benefit from direct in-VPC compute proximity.
Evaluating real monthly unit economics across practical engineering architectures.
Storing 5 TB of user images with 30 TB downloaded monthly. R2 costs $75.00 flat ($0 egress). AWS S3 costs $115 storage + $2,700 egress = $2,815.00.
Retaining 100 TB of medical or tax records for 7 years without read access. S3 Glacier Deep Archive costs $99/mo versus R2's $1,500/mo.
Distributing 100 GB of open-weights downloaded 5,000 times monthly (500 TB egress). Cloudflare R2 costs $1.50/mo. AWS S3 would cost $45,000.00.
import os
import boto3
from botocore.config import Config
# Cloudflare R2 is 100% S3 API compatible with boto3
r2_client = boto3.client(
's3',
endpoint_url=f"https://{os.environ['CLOUDFLARE_ACCOUNT_ID']}.r2.cloudflarestorage.com",
aws_access_key_id=os.environ['R2_ACCESS_KEY_ID'],
aws_secret_access_key=os.environ['R2_SECRET_ACCESS_KEY'],
region_name="auto",
config=Config(signature_version='s3v4')
)
def upload_to_r2(local_file: str, bucket_name: str, object_name: str):
"""Upload object to Cloudflare R2 with zero egress on downloads."""
r2_client.upload_file(local_file, bucket_name, object_name)
print(f"Uploaded {object_name} to R2 bucket '{bucket_name}' successfully.")Real-world engineering trade-offs and hidden bill shock traps to watch out for.
Explore complementary benchmarks and financial modeling tools across the index.
Full details on Class A/B operation tiers and free monthly allocations.
Analyze S3 Standard, Intelligent Tiering, and Glacier archive economics.
Compare zero-egress R2 against $0.006/GB Backblaze storage.
Analyze backup storage savings comparing AWS against Backblaze.
Yes! Cloudflare R2 charges $0.00 for data egress, no matter how many gigabytes or terabytes your users download from your buckets.
Cloudflare R2 charges $0.015 per GB-month ($15/TB). AWS S3 Standard charges $0.023 per GB-month ($23/TB), making R2 35% cheaper for base storage.
Yes! R2 implements the S3 API. Tools like the AWS CLI, boto3 (Python), aws-sdk (Node.js), Cyberduck, and rclone work by simply changing the endpoint URL.
Amazon S3 is preferable if you require S3 Glacier Deep Archive ($0.99/TB/mo) for cold data you rarely read, or if your applications depend on deep AWS integrations like Athena, EMR, and Glue.
Yes. Cloudflare R2 gives you 10 GB of storage, 1,000,000 Class A write operations, and 10,000,000 Class B read operations completely free every month.
Class A operations mutate state (PUT, POST, LIST, multipart uploads) and cost $4.50/M. Class B operations read data (GET, HEAD) and cost $0.36/M on R2.