High-performance infrastructure for vector search, RAG and logs. No credit card required, no "trial" expiration - just a robust environment to build your next AI application.
Most free tiers give you just enough memory to crash. We provide a full 4GB of RAM so you can actually load k-NN (k-Nearest Neighbors) indices into memory. This ensures the "instant" feel required for modern semantic search and AI retrieval.
4GB RAM
High-speed memory for vector engines
20GB Storage
Scale your document chunks and logs without worry
Up to 20 Shards
Distributed architecture to test realistic indexing patterns
k-NN & Vector Support
Native support for k-Nearest Neighbors (k-NN) to power semantic and hybrid search
Service benefits
Position OpenSearch as the retrieval layer between your data and your Large Language Model (LLM). Use our free tier to store, index, and retrieve embeddings for RAG-based applications.
Go beyond basic keyword matching. With the k-NN plugin enabled by default, you can build applications that understand intent.
RAG (Retrieval-Augmented Generation)
Provide LLMs with real-time private context to eliminate hallucinations.
Agentic AI Memory
Give your AI agents a persistent history to store user preferences and task states across sessions.
Hybrid Search
Combine BM25 text search with vector ranking to get the most relevant results for your users.
Don't let your search layer live in a silo. Connect your OpenSearch cluster to the rest of the Aiven Free Tier ecosystem. Stream data via Aiven for Apache Kafka® or sync relational metadata from Aiven for PostgreSQL®.
Store with Aiven's free PostgreSQL® or MySQL
Manage your relational metadata and source truths.
Learn moreSearch with Aiven's free OpenSearch®
Index your vectors and power your RAG applications with 4GB of dedicated RAM.
The free Aiven for OpenSearch® tier is a fully managed, persistent service offered at $0/month. It is specifically engineered for modern AI workloads, providing 4GB of RAM and 20GB of storage to help developers and learners build RAG applications, test vector search, and prototype AI agents on enterprise-grade infrastructure.
Yes. It’s a dedicated service tier, not a timed trial.
As long as the Free Aiven for OpenSearch plan exists, you can use it within the specified resource limits. There is no trial period or expiry date. Free services may be automatically powered off during periods of inactivity to maintain platform stability, but you can reactivate them instantly within the Aiven Console with no time limit imposed.
Absolutely. Visualize your indices and manage your cluster through the standard Dashboards UI.
When you’re ready for High Availability (HA) or more power, upgrade to a production plan with a single click - no migration needed.
To ensure high performance for all users on our shared infrastructure, the Free Tier has the following technical limits:
Absolutely. You can transition to a paid, high-availability (HA) configuration with a single click in the Aiven Console. Because the Free Tier runs on the same production-grade platform as our paid plans, your data, configurations, and endpoints remain intact during the upgrade. Aiven handles the orchestration behind the scenes to ensure a seamless move without data migration or downtime.
Yes. Aiven provides built-in monitoring for all free services. You can view real-time performance metrics and service logs directly in the Aiven Console to track memory usage and indexing health. Additionally, you have access to OpenSearch Dashboards for a full visual overview of your data and indices.
Yes. We believe enterprise-grade security should be the standard for every builder. All data in the free OpenSearch tier is encrypted at rest (on disk) and in transit (using TLS/SSL). Your AI "Long-Term Memory" and vector databases are protected by the same security protocols used in our mission-critical paid plans.
Ready to build?
Join thousands of developers building the next generation of search on enterprise-grade infrastructure.
