FaissA library for efficient similarity search and clustering of dense vectors.

RedisReal-time data for agents & apps

Comparison · Vector Databases · weekly run Nov 2

Faiss vs Redis

Which one do AI engines recommend, and how do they differ on price, fit and features?

The short answer

Redis is the stronger AI pick in Vector Databases: it has a visibility score of 7.7 versus 5.4 for Faiss, and ranks ahead in 100% of the answers that name both.

Choose Faiss if…

No separate server needed for small or static datasets

Choose Redis if…

You want the brand AI engines rank higher (7.7 vs 5.4)
AI answers describe it more positively (33% vs 12% positive)
You need a self-hosted or on-premises option
You need SOC 2 or ISO 27001 or ISO 27017 or ISO 27018 or ISO 27701 or ISO 42001 or ISO 22301 or ISO 9001 or PCI DSS or HIPAA or GDPR or CCPA or CSA STAR or VPAT or FIPS 140-3 coverage

AI visibility side by side

Latest weekly run · Nov 2

Metric	Faiss	Redis
Visibility score	5.4%	7.7%
Change vs last week	New	New
Rank in Vector Databases	#13	#10
Share of voice	1.7%	3%
Mentions this run	8	14
Positive in AI answers	12%	33%

The stronger value in each row is marked with a ✓.

Visibility score trend

Weekly runs over the last 60 days

Faiss 0pp · Redis 0pp over 0 weekly runs.

Engine by engine

Redis leads on 2 of 3 engines

ChatGPT

3.7%

6.1%

AI Mode

8.3%

3.5%

Perplexity

4.1%

13.5%

FaissRedis

Head to head in AI answers

3 engine answers name both brands

0Faiss ranked higher

3Redis ranked higher

Prompt	Engine	Faiss	Redis
How do companies store and search embeddings without a dedicated tool?	ChatGPT	#7	#6
How do companies store and search embeddings without a dedicated tool?	AI Mode	#8	#6
What are the best Vector Databases tools in 2026?	ChatGPT	#12	#9

Features, pricing & fit

Dimension	Faiss	Redis
Pricing model	—	Usage-based
Entry price	—	Free; paid from $0.007 / mo
Free plan	—	Yes
Deployment	Self-hosted library that runs inside the calling process on a local machine.	Managed cloud service (Redis Cloud) on AWS, Azure and Google Cloud, plus on-premises and hybrid deployment with Redis Software.
Compliance	—	SOC 2, ISO 27001, ISO 27017, ISO 27018, ISO 27701, ISO 42001, ISO 22301, ISO 9001, PCI DSS, HIPAA, GDPR, CCPA, CSA STAR, VPAT, FIPS 140-3
Support	—	Community support on the free plan, Basic support on Essentials plans, Redis support team on paid plans, Knowledge base
Founded	2017	2011
Headquarters	—	San Francisco, CA
Employees	—	1,001–5,000
Funding	—	Series D
Best for	Developers who need fast vector search inside their own application and can handle low-level setup.	Developers and digital businesses building fast apps and real-time AI agents that need low-latency data access.