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Machine Learning · head to head

Milvus vs NotebookLM

Milvus logo

Milvus

Machine Learning

Open-source vector database for scalable similarity search

From
Free
Free plan
Yes
Full reviewWebsite
NotebookLM logo

NotebookLM

AI

Google research assistant that grounds answers in user-uploaded documents

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Milvus vector dimensions are capped at 32,768; NotebookLM requires Google account; no standalone access without Gmail or Google Workspace
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Milvus and NotebookLM actually diverge.

Attributes where Milvus and NotebookLM differ
AttributeMilvusNotebookLM
PlatformsLinux, Mac, Windows, WebWeb
CategoryMachine LearningAI
Founded2017Unknown

Identical on both: starting price (Free), pricing model (freemium), 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 Milvus

  • Billion-scale vectors
  • Multiple index types
  • GPU acceleration
  • Hybrid search
  • Data partitioning
  • PyTorch
  • TensorFlow
  • Hugging Face

Only in NotebookLM

Nothing recorded that Milvus does not also cover.

What people use each for

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

Milvus

  • Self hosting a vector database for semantic searchnot NotebookLM
  • Storing and querying embeddings for retrieval augmented generationnot NotebookLM
  • Similarity search over images, audio or text at scalenot NotebookLM

NotebookLM

  • Research synthesis and document analysis for students and academicsnot Milvus
  • Knowledge extraction from large document sets for business intelligencenot Milvus
  • Audio-based learning through generated overviews and lecturesnot Milvus
  • Grounded Q&A over proprietary documents or repositoriesnot Milvus

Where each one falls short

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

Milvus

  • Vector dimensions are capped at 32,768
  • A collection is limited to 64 fields, 1,024 partitions and 16 shards
  • Only 1 index is allowed per field
  • Search returns at most 16,384 vectors as top-k, and nq is capped at 16,384
  • Input and output per RPC is capped at 64 MB for insert, search and query
  • VARCHAR values are limited to 65,535 characters
  • Data loaded into query nodes cannot exceed 90% of available memory
  • An instance supports at most 65,536 collections

NotebookLM

  • Requires Google account; no standalone access without Gmail or Google Workspace
  • Free tier details not published; unclear what features or usage limits apply
  • Upgrade options mentioned but not specified in available public documentation
  • Limited integrations outside Google Workspace ecosystem

Pricing, plan by plan

Milvus

Free
  • Open SourceFree
    • Full features
    • Self-hosted
    • Community support
  • Zilliz CloudFree
    • Managed service
    • Free tier available

NotebookLM

Free

No published plan breakdown. See the NotebookLM review.

Which should you pick?

Choose Milvus if

  • You need billion-scale vectors.
  • You want to start without paying.
  • You work on Linux, Mac, Windows, Web.
  • You also want multiple index types.
Milvus review

Choose NotebookLM if

  • You want to start without paying.
NotebookLM review

Questions people ask

Is Milvus or NotebookLM better?
Neither clearly leads. Milvus starts at Free and NotebookLM at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Milvus or NotebookLM?
Milvus starts at Free and NotebookLM at Free.
Does Milvus or NotebookLM run on more platforms?
Milvus runs on Linux, Mac, Windows, Web. NotebookLM runs on Web.
Can I use Milvus for free?
Both have a free tier, so you can try either at no cost before committing.
What is Milvus best used for?
Milvus is most often used for self hosting a vector database for semantic search, storing and querying embeddings for retrieval augmented generation, similarity search over images, audio or text at scale. Of those, self hosting a vector database for semantic search and storing and querying embeddings for retrieval augmented generation are not what NotebookLM is typically brought in for.
What can Milvus do that NotebookLM cannot?
Milvus covers Billion-scale vectors, Multiple index types, GPU acceleration, Hybrid search.

Answered from the vendors’ own pages

Milvus: How much does Milvus cost?

Milvus is open-source and free to use and modify. The self-hosted version has no licensing cost. Zilliz Cloud (the managed SaaS version) does not publish pricing on the website.

Source
Milvus: Is there a free or open-source version of Milvus?

Yes, Milvus is fully open-source and available for free. Milvus Lite is a lightweight option for learning and prototyping that can be installed via pip.

Source
Milvus: Does Milvus offer a managed cloud service?

Yes, Zilliz Cloud is a fully managed Milvus cloud offering with serverless and dedicated cluster options. Pricing must be requested from the company as it is not listed on the public website.

Source
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