kitio.aiElasticsearch vs Faiss
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Faiss is completely free, while Elasticsearch is free trial.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Vector embedding storage and search
- Elastic Agent Builder
- Kibana dashboards
- Jina AI search models
- Serverless, hosted or self-managed
- Observability and security use cases
- Nearest neighbor search
- Clustering
- GPU algorithms
- Python wrappers
- Indexes larger than RAM
- Evaluation tools
| Feature | Elasticsearch | Faiss |
|---|---|---|
| Best for | Search engine and vector database for AI apps and agents | Open-source library for similarity search over dense vectors |
| Category | Models & APIs | Models & APIs |
| Pricing model | Free trial | Free |
| Starting price | See pricing page | Free |
| Free plan | No, trial available | Yes, fully free |
| Made by | Elastic | Meta FAIR |
| Based in | Netherlands | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Faiss is completely free, while Elasticsearch is free trial.
Free plan
Cheapest paid plan
Top plan
Free trial
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Elasticsearch
- Handles keyword and vector search together
- Three deployment options
- Mature ecosystem and tooling
- Pricing details are not clear on the page
- Cluster tuning takes expertise
- Broad product line can be confusing
Faiss
- Free and open source
- Scales past available memory
- GPU support for key algorithms
- A library, not a managed service
- Needs engineering effort to deploy
- Not a database, so no built-in server or storage
Which one should you choose?
Choose Elasticsearch if you want:
- Handles keyword and vector search together
- Three deployment options
- Mature ecosystem and tooling
Watch out: pricing details are not clear on the page.
Choose Faiss if you want:
- Free and open source
- Scales past available memory
- GPU support for key algorithms
Watch out: a library, not a managed service.
Elasticsearch vs Faiss FAQ
What is the difference between Elasticsearch and Faiss?
Elasticsearch: Search engine and vector database for AI apps and agents. Faiss: Open-source library for similarity search over dense vectors. Both are models & apis tools.
Is Elasticsearch or Faiss cheaper?
Faiss is completely free, while Elasticsearch is free trial.
Do Elasticsearch and Faiss have free plans?
Elasticsearch: No, trial available. Faiss: Yes, fully free.
Who makes Elasticsearch?
Elasticsearch is made by Elastic, based in Netherlands.
Who makes Faiss?
Faiss is made by Meta FAIR, based in United States.
Which should I choose, Elasticsearch or Faiss?
Choose Elasticsearch if you value handles keyword and vector search together and three deployment options. Choose Faiss if you value free and open source and scales past available memory.