Comparison

Epsilla vs Faiss

No leader: the top candidate Epsilla has only 0.30 confidence (low), below the 0.35 needed to declare a winner. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

Epsilla full profile →Faiss full profile →

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Epsilla78

Faiss62

Attribute comparison across 2 tools
Attribute	Epsilla	Faiss
Vioscale score	78 / 100low · 30%	62 / 100low · 36%
Pricing
Free tierpricing.free_tier	✓	-
Modelpricing.model	freemium	commercial
Price levelpricing.price_level	mid	free
Transparentpricing.transparent	✓	-
Security
Scorecardsecurity.scorecard	-	6.1
Vulnerabilitiessecurity.vulnerabilities	-	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=faiss-cpu&per_page=100 · Last 12m: 0
Reliability
Sla pctreliability.sla_pct	99.9	-
Status pagereliability.status_page	✓	✓
Adoption
Dependent reposadoption.dependent_repos	-	5,592
Github starsadoption.github_stars	-	40,809
Activity
Commits last 30dactivity.commits_last_30d	-	47
Release
Cadence daysrelease.cadence_days	-	83
Historyrelease.history	-	20 items
License
Spdxlicense.spdx	-	MIT
Language
Primarylanguage.primary	-	C++

Score

Vioscale score

Epsilla78 / 100low · 30%

Faiss62 / 100low · 36%

Pricing

Free tier

Epsilla✓

Faiss–

Model

Epsillafreemium

Faisscommercial

Price level

Epsillamid

Faissfree

Transparent

Epsilla✓

Faiss–

Security

Scorecard

Epsilla–

Faiss6.1

Vulnerabilities

Epsilla–

FaissCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=faiss-cpu&per_page=100 · Last 12m: 0

Reliability

Sla pct

Epsilla99.9

Faiss–

Status page

Epsilla✓

Faiss✓

Adoption

Dependent repos

Epsilla–

Faiss5,592

Github stars

Epsilla–

Faiss40,809

Activity

Commits last 30d

Epsilla–

Faiss47

Release

Cadence days

Epsilla–

Faiss83

History

Epsilla–

Faiss20 items

License

Spdx

Epsilla–

FaissMIT

Language

Primary

Epsilla–

FaissC++

Capabilities

Feature-by-feature on the axes that matter for vector databases. “-” means undocumented, not absent.

Capability comparison for Vector Databases
Capability	Epsilla	Faiss
Deployment
Deployment	Managed	Self-hosted
Serverless / consumption pricing	✓	✗
Index
ANN index (HNSW / IVF / DiskANN / ScaNN / flat)	-	HNSW, IVF, PQ, multi-index, NSG
Distance metrics (cosine / dot / Euclidean)	-	Euclidean (L2), inner product, L1, Linf
Query
Metadata filtering	-	-
Hybrid search (dense + sparse fusion)	-	-
Built-in BM25 / lexical	-	-
Storage
Quantization	-	Product
On-disk vs in-memory	-	Disk-backed
Scale
Multi-tenancy (namespaces / collections / tenants)	✓	-
Horizontal scale	-	Single-node
Consistency
Consistency	-	-
Licensing
Licence class	Proprietary	Permissive OSS
Classification
Purpose-built vs feature-of-parent	Feature of parent	Extension

Deployment

EpsillaManaged

FaissSelf-hosted

Serverless / consumption pricing

Epsilla✓

Faiss✗

Index

ANN index (HNSW / IVF / DiskANN / ScaNN / flat)

Epsilla-

FaissHNSW, IVF, PQ, multi-index, NSG

Distance metrics (cosine / dot / Euclidean)

Epsilla-

FaissEuclidean (L2), inner product, L1, Linf

Query

Metadata filtering

Epsilla-

Faiss-

Hybrid search (dense + sparse fusion)

Epsilla-

Faiss-

Built-in BM25 / lexical

Epsilla-

Faiss-

Storage

Quantization

Epsilla-

FaissProduct

On-disk vs in-memory

Epsilla-

FaissDisk-backed

Scale

Multi-tenancy (namespaces / collections / tenants)

Epsilla✓

Faiss-

Horizontal scale

Epsilla-

FaissSingle-node

Consistency

Epsilla-

Faiss-

Licensing

Licence class

EpsillaProprietary

FaissPermissive OSS

Classification

Purpose-built vs feature-of-parent

EpsillaFeature of parent

FaissExtension

What each one is

The product in its own terms, so the numbers below have context.

Epsilla

A platform that simplifies building AI agents and knowledge-base systems for teams of any technical level. It provides enterprise-grade multi-tenancy and supports flexible deployment modes including cloud, on-premise, and private cloud.

Independently observed

Faiss

Faiss is a library for efficient similarity search and clustering of dense vectors. It contains algorithms that search in sets of vectors of any size, up to ones that possibly do not fit in RAM.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Epsilla

from $29/moSubscriptionFree tier

Free tier through $2,499/month. Custom pricing for Enterprise. Metered add-ons $2–39/month.

Free TierFree
- 1 Team Member
- 1 Project
- 1 AI Application
- 1 Knowledge Base
- 10M Vector Storage
- +3 more
Starter Tier$29/month
- 2 Team Members
- 1 Project
- 5 AI Applications
- 5 Knowledge Bases
- 1G Vector Storage
- +2 more
Professional Tier$249/month
- 20 Team Members
- 10 Projects
- 50 AI Applications
- 50 Knowledge Bases
- 10G Vector Storage
- +3 more
AI Concierge$2,499/month
- Everything in Professional
- Fractional Forward Deployed AI Engineer
- Done-For-You AI Agent & Workflow Build-Out
- Domain-to-AI Enablement
- Weekly Strategy & Review Calls
- +3 more
Enterprise TierContact sales
- Unlimited Team Members
- Unlimited Projects
- Unlimited AI Applications
- Unlimited Knowledge Bases
- Unlimited Vector Storage
- +6 more

as of 2026-08-03verify ↗

Faiss

Open source

as of 2026-08-13verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platform and deployment support comparison
Supports	Epsilla	Faiss
WebPlatforms	✓	✗
macOSPlatforms	✗	✓
WindowsPlatforms	✗	✓
LinuxPlatforms	✗	✓
Cloud / SaaSDeployment	✓	✗
Self-hostedDeployment	✓	✓
On-premiseDeployment	✓	✗

Platforms

Web

Epsilla✓

Faiss✗

macOS

Epsilla✗

Faiss✓

Windows

Epsilla✗

Faiss✓

Linux

Epsilla✗

Faiss✓

Deployment

Cloud / SaaS

Epsilla✓

Faiss✗

Self-hosted

Epsilla✓

Faiss✓

On-premise

Epsilla✓

Faiss✗

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.