Amazon S3 vs OpenSearch (2026): Pricing, Features & Verdict
Amazon S3 is our pick, scoring 7.8/10 against 7.1/10 for OpenSearch on our Hosting & Infrastructure criteria. Its biggest advantage: higher Integration score (10/10 vs 7/10). Only OpenSearch has a free plan.
Last updated: November 2026
A
Amazon S3
7.8/10
Amazon S3 is AWS's pay-as-you-go object storage service. Businesses use it to store files, backups, data lakes and static website assets at almost any scale.
OpenSearch
7.1/10
OpenSearch is an open-source, Apache 2.0 search and analytics suite with vector search, ML connectors and AI agent APIs, used to build semantic search, RAG and observability applications.
Feature-by-Feature Comparison
| Feature | A Amazon S3 | |
|---|---|---|
| Scores | ||
| Overall Rating | 7.8/10 | 7.1/10 |
| Integration | 10/10 | 7/10 |
| Support | 6/10 | 5/10 |
| Cost | 5/10 | 9/10 |
| Customization | 8/10 | 9/10 |
| Security | 9/10 | 7/10 |
| Reliability | 9/10 | Not listed |
| Ease of Use | 5/10 | 4/10 |
| Analytics | 8/10 | 7/10 |
| Scalability | 10/10 | 8/10 |
| Pricing | ||
| Free plan | No | Yes |
| Cheapest paid plan | Contact for pricing | Contact for pricing |
| Estimated cost for 10 users | Contact for pricing | Free Open source (self-managed) |
| Features | ||
| API and CLI | Not listed | |
| Automatic Backups | Not listed | |
| Managed WordPress | Not listed | |
| Multiple Regions | Not listed | |
| Object Storage | Not listed | |
| Shared Hosting | Not listed | |
| Uptime SLA | Not listed | |
| More features | ||
| AI Agents | Not listed | |
| Private Deployment | Not listed | |
| Knowledge Base Search | Not listed | |
| Data Analysis | Not listed | |
| API Access | Not listed | |
| Enterprise Controls | Not listed | |
Amazon S3 vs OpenSearch cost by team size
| Team size | Amazon S3 | OpenSearch |
|---|---|---|
| 1 user | Contact for pricing | FreeOpen source (self-managed) |
| 5 users | Contact for pricing | FreeOpen source (self-managed) |
| 10 users | Contact for pricing | FreeOpen source (self-managed) |
| 25 users | Contact for pricing | FreeOpen source (self-managed) |
| 50 users | Contact for pricing | FreeOpen source (self-managed) |
The plan that fits each team size, billed monthly, before add-ons and usage charges. Each cost opens that tool's pricing calculator for the team size.
Who Amazon S3 and OpenSearch suit
Amazon S3 fits small business better than OpenSearch.
| Audience | Amazon S3 | OpenSearch |
|---|---|---|
| Small Business | 5/10The storage rates are cheap, but reviewers say the console and the pricing model are complex. | 3/10Running and tuning clusters takes engineering skill that most small businesses do not have. |
| Enterprise | 9/10It offers Object Lock, replication, audit logging and organisation-wide analytics through Storage Lens. | 8/10Foundation governance, RBAC, audit logging, SAML and OIDC, and self-hosting all suit large organisations with platform teams. |
| Developers | 9/10S3 is managed through a widely adopted API and SDKs, and that API has become the standard interface for object storage. | 9/10It is an open-source engine with REST APIs and ML Commons connectors, aimed at engineers building search and RAG applications. |
| IT Teams | Not rated | 8/10It is widely used for log analytics and observability, covering traces, metrics and logs. |
| SaaS Companies | 8/10It scales without limit for application data, and transfers to other AWS services in the same Region are free. | Not rated |
| Startups | 7/10There are no upfront costs, and new AWS accounts get Free Tier credits. | Not rated |
Which One Should You Choose?
AWhy choose Amazon S3
- Higher Integration score (10/10 vs 7/10)
- Higher Security score (9/10 vs 7/10)
- Better fit for small business (5/10 vs 3/10)
Why choose OpenSearch
- Has a free plan (Amazon S3 does not)
- Higher Cost score (9/10 vs 5/10)
- Higher Customization score (9/10 vs 8/10)
Pros & Cons
AAmazon S3
Pros
- Very high scale: about 500 trillion objects stored and around 200 million requests per second, according to Wikipedia.
- The S3 API is the industry standard, so a wide range of tools and competing storage providers support it.
- Strong data protection: versioning, MFA Delete, Object Lock in compliance mode, and cross-Region replication with a time-bound SLA.
- Many storage classes, from Express One Zone to Glacier Deep Archive at about $0.001 per GB-month, let teams match cost to how often data is accessed.
- Reviews are consistently positive: about 4.7 out of 5 from more than 1,100 Capterra reviews.
Cons
- Internet egress costs about $0.09 per GB after the first free 100 GB a month, and competitors widely criticise these fees.
- Request, retrieval and lifecycle-transition fees make monthly bills hard to predict.
- Reviewers on Capterra and TrustRadius call the console navigation and user interface complex.
- The SLA pays only service credits toward future bills, never refunds, and infrequent-access classes have a lower 99% uptime threshold.
OpenSearch
Pros
- The Apache 2.0 licence and Linux Foundation governance remove vendor licence fees and lock-in.
- Security features such as RBAC, audit logging, SAML and OIDC are free, whereas Elastic puts some of these behind paid licences.
- AI features are moving quickly: agentic search went GA in 3.3, and agent memory, MCP support and LLM-as-judge relevance testing came in later 3.x releases.
- It runs on Kubernetes, Docker, bare metal or the managed Amazon OpenSearch Service, using the same codebase.
Cons
- Large or multi-tenant clusters often need manual tuning of caches, merges and thread pools.
- Dashboards is a Kibana 7.10 fork and is described as less polished than current Kibana.
- Plugin features such as k-NN and anomaly detection can vary in stability between versions.
- Some benchmarks and Elasticsearch users report performance and feature gaps against current Elasticsearch.
Not sold on either?
Frequently Asked Questions
Amazon S3 scores higher on our Hosting & Infrastructure criteria: 7.8/10 against 7.1/10 for OpenSearch. The largest gap is in Cost: 5/10 for Amazon S3 and 9/10 for OpenSearch.
OpenSearch has a free plan; Amazon S3 does not list one.
Amazon S3 is the better fit for small business: we rate it 5/10 for them, against 3/10 for OpenSearch.
