Object storage · Comparison
Amazon S3 vs Backblaze B2 vs Cloudflare R2 vs Google Cloud Storage
4 products compared side by side: what you pay for with each one first, then the five access facts, entry prices, recorded plan limits and the bottom line of each review. The evidence note under the table says how each product was checked.
Side by side
| Metric | Amazon S3 | Backblaze B2 | Cloudflare R2 | Google Cloud Storage |
|---|---|---|---|---|
| What you're paying for | Compliance includedThe S3 API itself, with compliance-mode Object Lock, replication and a self-serve HIPAA BAA in place, billed per use with no minimum charge. | Worth the priceHot S3-compatible storage at a flat $6.95 per TB a month, with read, write and list calls free and egress free up to 3x what you store. | Worth the priceS3-compatible storage where downloads carry no egress fee, so serving or moving data out costs only the requests it takes. | Compliance includedHot to archive storage in one API, with cross-region buckets, retention locks that cannot be undone and compliance papers you accept yourself. |
| Overall score | 6.4 | 8.6Best | 8.1 | 7.3 |
| Free option | Free trial | Free plan | Free plan | Free plan |
| Card to start | –Not measured | No card needed | –Not measured | Card required |
| Getting access | Self-serve | Self-serve | Self-serve | Self-serve |
| Starter priceCheapest paid plan | $0.023/GB-mo | $6.95/TB/mo | $0.015/GB-month | $0.02/GiB-month |
| Pricing model | Usage-based | Usage-based | Usage-based | Usage-based |
| Pricing page | Public prices | Public prices | Public prices | Public prices |
| Standard storage price | $0.023/GB-month (US East, first 50 TB; binary GB) | $6.95/TB per 30 days, billed per byte-hour; same in all 4 regions | $0.015/GB-month | $0.02/GiB-month (Iowa, us-central1; prorated to the sub-second) |
| Egress to the internet | $0.09/GB for the first 10 TB (US East); 100 GB a month free across AWS | Free up to 3x average stored data, then $0.01/GB; free to listed CDN and compute partners | No egress fee for any storage class | $0.12/GiB for the first 10 TiB (all destinations except China and Australia); free within the same Google Cloud location |
| Request fees | PUT, COPY, POST, LIST $0.005 per 1,000; GET $0.0004 per 1,000 | Class A, B and C calls free; event notifications (Class D) $0.004 per 10,000 after 2,500 a day | Class A $4.50 per million; Class B $0.36 per million | Class A $0.005 per 1,000; Class B $0.0004 per 1,000 (Standard, single region) |
| Free option | No permanent free storage; up to $200 in credits for new accounts | First 10 GB always free, no credit card | 10 GB-month, 1 million Class A and 10 million Class B a month, permanent | 5 GB-months, 5,000 Class A, 50,000 Class B and 100 GB egress a month, permanent (3 US regions); $300 credit for 90 days |
| Reference scenario (1 TB/mo) | $122.00 in US East, $90 of it egress, computed | $6.95, egress and calls free within the rules, computed | $23.10, no egress charge, computed | $149.00 in Iowa, $120 of it egress, computed |
| Billing minimums | None on S3 Standard; 30 to 180 days on colder classes | None stated (no minimum file size, storage duration or monthly charge) | None on Standard; 30 days on Infrequent Access | None on Standard; 30 to 365 days on colder classes |
| S3 API | Native (the S3 API itself) | S3-compatible, next to the B2 Native API | S3-compatible; versioning, Object Lock and replication calls not implemented | Interoperability mode (XML API with HMAC keys) |
| Versioning and object lock | Versioning; compliance-mode Object Lock | Versioning on by default; compliance-mode Object Lock | No versioning; R2 bucket locks the account can remove | Versioning; Bucket Lock and Object Retention Lock (Locked mode cannot be removed) |
| Replication | Cross-Region and Same-Region Replication | Cloud Replication within or between regions (another region needs a second account) | No built-in replication | Built into dual- and multi-region buckets; cross-bucket replication |
| SOC 2 / ISO 27001 | AWS SOC 2 report in AWS Artifact; ISO 27001 list names S3 | Own SOC 2 Type 2 report; ISO 27001 held by its data centres | Cloudflare SOC 2 Type II names R2; ISO 27001:2022 | Google Cloud SOC 2 Type II (quarterly, names Cloud Storage); ISO 27001 |
| HIPAA BAA | Self-serve in AWS Artifact | On request for covered entities | Enterprise customers only | Self-serve in the console (IAM & Admin) |
| Regions | 36, including EU and AWS GovCloud (US) | 4 (US East, US West, EU Central, CA East); one per account | 6 location hints (best effort); EU, US and FedRAMP jurisdictions | 43, including 13 in Europe, plus dual-regions and ASIA, EU and US multi-regions |
| Bottom line | From its public pages, Amazon S3 is the reference S3 service and has every protection and compliance feature we score. Storage and requests are priced per use with no minimum, and internet egress, billed per GB, is the main cost to plan for. | From its public pages, Backblaze B2 has the lowest list price in our 1 TB scenario, with free API calls, egress free up to 3x storage and solid data protection. Each account sits in one of 4 regions, with one storage class. | From its public pages, Cloudflare R2 removes the egress fee and keeps billing simple, with a permanent free tier and no minimums on Standard. Versioning, the S3 Object Lock API and replication are not implemented, so it suits serving data more than strict retention. | From its public pages, Google Cloud Storage has nearly every protection and compliance feature we score, publishes every price in USD and keeps a permanent free tier. Internet egress, billed per GiB, is the main cost, and S3 support is an interoperability mode. |
Evidence: Amazon S3: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run; Backblaze B2: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run; Cloudflare R2: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run; Google Cloud Storage: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run. Prices in USD as listed, excluding tax. "–" means not recorded.
When to pick each
In the words of each review, with the date its facts were checked.
From our Amazon S3 review
Checked Oct 15, 2026- Pick Amazon S3 when
- You need versioning, compliance-mode Object Lock, replication or a self-serve BAA from the S3 API itself.
- Pick Cloudflare R2 when
- Your data is downloaded often: R2 charges no egress fee, and our 1 TB scenario is $23.10 there against $122 on S3.
From our Amazon S3 review
Checked Oct 15, 2026- Pick Amazon S3 when
- You need many regions, storage classes with lifecycle transitions, or a BAA you accept yourself.
- Pick Backblaze B2 when
- You want one flat price of $6.95 per TB, free API calls (Classes A to C) and egress free up to 3x what you store.
From our Amazon S3 review
Checked Oct 15, 2026- Pick Amazon S3 when
- Your tools expect the S3 API as the main interface, not an interoperability mode.
- Pick Google Cloud Storage when
- You build on Google Cloud and want a permanent free tier of 5 GB-months, or dual- and multi-region buckets.
From our Backblaze B2 review
Checked Oct 15, 2026- Pick Backblaze B2 when
- You want one flat rate of $6.95 per TB, free API calls (Classes A to C) and egress free up to 3x what you store.
- Pick Amazon S3 when
- You need many regions, storage classes with lifecycle transitions, or a HIPAA BAA you accept in the console.
From our Backblaze B2 review
Checked Oct 15, 2026- Pick Backblaze B2 when
- You need object versioning and a lock no user can remove, or you download less than 3x what you store.
- Pick Cloudflare R2 when
- Your downloads run well above 3x what you store: R2 charges no egress fee for any storage class.
From our Cloudflare R2 review
Checked Oct 15, 2026- Pick Cloudflare R2 when
- Your data is downloaded often: our 1 TB scenario is $23.10 here against $122 on S3, where $90 is egress.
- Pick Amazon S3 when
- You need versioning, compliance-mode Object Lock, replication or a HIPAA BAA you accept yourself.
From our Cloudflare R2 review
Checked Oct 15, 2026- Pick Cloudflare R2 when
- Downloads may exceed 3x what you store, or your code runs on Cloudflare Workers.
- Pick Backblaze B2 when
- You want the lowest scenario price here ($6.95), free Class A to C calls, versioning and compliance-mode Object Lock.
From our Google Cloud Storage review
Checked Oct 15, 2026- Pick Google Cloud Storage when
- You build on Google Cloud, or want a permanent free tier of 5 GB-months with requests and egress, or dual- and multi-region buckets.
- Pick Amazon S3 when
- Your tools expect the S3 API as the main interface; our 1 TB scenario is also lower there, $122 against $149.
From our Google Cloud Storage review
Checked Oct 15, 2026- Pick Google Cloud Storage when
- You need versioning, retention no one can remove, built-in replication or a self-serve HIPAA BAA.
- Pick Cloudflare R2 when
- Most of your data is downloaded to the internet: R2 charges no egress fee, and our 1 TB scenario is $23.10 there.
From our Google Cloud Storage review
Checked Oct 15, 2026- Pick Google Cloud Storage when
- You need several storage classes with lifecycle moves, many regions or a BAA you accept yourself.
- Pick Backblaze B2 when
- You want one flat price of $6.95 per TB, free API calls (Classes A to C) and egress free up to 3x what you store.
Entry price
Baseline: each product's cheapest paid plan, per month. Included usage differs, so read the line under each price.
- Amazon S3S3 Standard$0.023/GB-moUS East, first 50 TB; $0.022 next 450 TB, $0.021 over 500 TB; GB = 2^30 bytes
- PUT, COPY, POST, LIST $0.005 per 1,000 requests
- GET $0.0004 per 1,000 requests
- Internet egress $0.09/GB for the first 10 TB
- No minimum storage duration or object size
- Backblaze B2B2 pay-as-you-go$6.95/TB/moBilled per byte-hour at $6.95/TB per 30 days for storage after the first 10 GB; card or invoice, monthly
- Egress free up to 3x average monthly storage, then $0.01/GB
- Class A, B and C calls free
- Event notifications (Class D): 2,500 a day free, then $0.004 per 10,000
- No minimum file size or storage duration
- Cloudflare R2Standard storage$0.015/GB-monthClass A $4.50 per million, Class B $0.36 per million, no egress fee, no minimum storage duration
- No minimum object size
- S3-compatible API and Workers API
- Usage rounded up to the next billing unit
- Requests rejected with 401 Unauthorized are not charged
- Google Cloud StorageStandard storage$0.02/GiB-monthIowa (us-central1); $0.023 in Northern Virginia, $0.026 in the US multi-region, $0.022 per region in dual-regions
- Class A $0.005 and Class B $0.0004 per 1,000 operations (single region)
- Internet egress $0.12/GiB for the first 10 TiB
- No minimum storage duration and no retrieval fee
- GB means JEDEC GB (GiB)
Prices as listed on each pricing page, in USD per month, excluding tax. Observed: Amazon S3 2026-10-15, Backblaze B2 2026-10-15, Cloudflare R2 2026-10-15, Google Cloud Storage 2026-10-15.
Which one fits
- If you need to start today without a sales call
- Backblaze B2Self-serve sign-up, no card needed; the highest score of the 4 self-serve products here (8.6/10).
- If you want to try it without entering a card
- Backblaze B2Free plan, no card needed; scored 8.6/10.
- Lowest starter price
- Cloudflare R2$0.015/GB-month for the Standard storage plan.
- Highest overall score
- Backblaze B28.6/10 (Excellent). The review shows the score breakdown and the run behind it.
Picked by fixed rules from the table above, not by hand. How we score