Is Postgres or Zilliz better?

Neither clearly leads. Postgres starts at Free and Zilliz at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, Postgres or Zilliz?

Postgres starts at Free and Zilliz at Free.

Does Postgres or Zilliz run on more platforms?

Postgres runs on Linux, Windows, Macos, Docker. Zilliz runs on Cloud, Self-hosted.

Can I use Postgres for free?

Both have a free tier, so you can try either at no cost before committing.

What is Postgres best used for?

Postgres is most often used for running a general purpose relational database for applications, self-hosting an open source sql database with no licence fee, workloads needing extensions, json and full text search in one engine. Of those, running a general purpose relational database for applications and self-hosting an open source sql database with no licence fee are not what Zilliz is typically brought in for.

What can Postgres do that Zilliz cannot?

Postgres covers ACID compliance, Complex queries, Foreign keys, Triggers. Zilliz covers Vector indexing, Distributed architecture, SQL interface, Tensor support.

Technology · head to head

Postgres vs Zilliz

Postgres

Technology

The world's most advanced open source database

From: Free
Rated: -

Full review Website

Zilliz

Databases

Managed vector database and vector lakebase for AI applications

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: Postgres each major version is supported for only 5 years after its initial release, after which it is end-of-life; Zilliz pricing structure not publicly disclosed, requires sales contact
They diverge on capability: Postgres covers ACID compliance, Zilliz covers Vector indexing.
Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Postgres and Zilliz actually diverge.

Attributes where Postgres and Zilliz differ
Attribute	Postgres	Zilliz
Pricing model	open-source	contact-sales
Platforms	Linux, Windows, Macos, Docker	Cloud, Self-hosted
Category	Technology	Databases
Founded	1996	2017

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Postgres

ACID compliance
Complex queries
Foreign keys
Triggers
Views
Stored procedures
JSON/JSONB support
Full-text search

Only in Zilliz

Vector indexing
Distributed architecture
SQL interface
Tensor support
Real-time search
Cloud-native
Open-source compatible

What people use each for

The jobs each tool is most often brought in to do.

Postgres

Running a general purpose relational database for applicationsnot Zilliz
Self-hosting an open source SQL database with no licence feenot Zilliz
Workloads needing extensions, JSON and full text search in one enginenot Zilliz

Zilliz

Build retrieval-augmented generation (RAG) systemsnot Postgres
Implement semantic search over documentsnot Postgres
Create multimodal search with text and imagesnot Postgres
Power recommendation engines with vector similaritynot Postgres
Enable similarity search on user embeddingsnot Postgres

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Postgres

Each major version is supported for only 5 years after its initial release, after which it is end-of-life
Major version upgrades break on-disk compatibility and require a full dump and reload or the pg_upgrade tool
New major versions ship about once a year, so staying supported means a disruptive upgrade cycle
Minor releases contain only frequently-encountered bug fixes, low-risk fixes, security issues and data corruption fixes, so feature gaps are not addressed within a major version
There is no vendor SLA; commercial support must be bought separately from third party professional services listed by the project

Zilliz

Pricing structure not publicly disclosed, requires sales contact
Operational complexity for self-hosted Milvus deployments
Learning curve for those unfamiliar with vector databases
Limited built-in analytics compared to some alternatives

Pricing, plan by plan

Postgres

Free

Community EditionFree
- Full database features
- No limitations
- Community support

Zilliz

Free

No published plan breakdown. See the Zilliz review.

Which should you pick?

Choose Postgres if

You need acid compliance.
You want to start without paying.
You work on Linux, Windows, Macos, Docker.
You also want complex queries.

Postgres review

Choose Zilliz if

You need vector indexing.
You want to start without paying.
You work on Cloud, Self-hosted.
You also want distributed architecture.

Zilliz review

Questions people ask

Is Postgres or Zilliz better?: Neither clearly leads. Postgres starts at Free and Zilliz at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Postgres or Zilliz?: Postgres starts at Free and Zilliz at Free.
Does Postgres or Zilliz run on more platforms?: Postgres runs on Linux, Windows, Macos, Docker. Zilliz runs on Cloud, Self-hosted.
Can I use Postgres for free?: Both have a free tier, so you can try either at no cost before committing.
What is Postgres best used for?: Postgres is most often used for running a general purpose relational database for applications, self-hosting an open source sql database with no licence fee, workloads needing extensions, json and full text search in one engine. Of those, running a general purpose relational database for applications and self-hosting an open source sql database with no licence fee are not what Zilliz is typically brought in for.
What can Postgres do that Zilliz cannot?: Postgres covers ACID compliance, Complex queries, Foreign keys, Triggers. Zilliz covers Vector indexing, Distributed architecture, SQL interface, Tensor support.

Answered from the vendors’ own pages

Postgres: How much does PostgreSQL cost to use?

PostgreSQL is completely free to download, install, and use. No licensing fees, subscription costs, or per-seat charges apply. The database is open source under the PostgreSQL License. Source: https://www.postgresql.org

Source

Zilliz: What is the difference between Milvus and Zilliz Cloud?

Milvus is the open-source vector database that you can self-host. Zilliz Cloud is the fully managed service built on Milvus that removes operational overhead and handles scaling automatically.

Source

Postgres: Are there commercial PostgreSQL support options available?

Official PostgreSQL (the project) is free. Commercial PostgreSQL services such as hosting, professional support, training, and managed database services are offered by third-party vendors, not the PostgreSQL project itself. Source: https://www.postgresql.org

Source

Zilliz: How many vectors can Zilliz handle?

Milvus and Zilliz Cloud can store and search billions of vectors through their distributed architecture that separates storage and compute layers.

Source

Postgres: Do I need a license to use PostgreSQL commercially?

No. PostgreSQL is open source under the PostgreSQL License, which permits free commercial use without royalties, licensing fees, or support obligations. Source: https://www.postgresql.org

Source

Zilliz: Is Milvus open-source?

Yes, Milvus is open-source under the Apache License 2.0 and is part of the LF AI & Data Foundation.

Source

Zilliz: What pricing does Zilliz Cloud offer?

Zilliz Cloud pricing is not publicly listed and requires contacting their team to discuss your specific scale and use case requirements.

Source

Postgres vs Zilliz

Postgres

Zilliz

The short version

Where they differ

What each one covers

Only in Postgres

Only in Zilliz

What people use each for

Postgres

Zilliz

Where each one falls short

Postgres

Zilliz

Pricing, plan by plan

Postgres

Zilliz

Which should you pick?

Choose Postgres if

Choose Zilliz if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on Postgres

More on Zilliz

Keep looking

Other head to heads