Softwr

Machine Learning · head to head

Milvus vs Writer

Milvus logo

Milvus

Machine Learning

Open-source vector database for scalable similarity search

From
Free
Free plan
Yes
Full reviewWebsite
Writer logo

Writer

AI

Full-stack generative AI platform for enterprise content and agents

From
On request
Free plan
No
Full reviewWebsite

The short version

  • Only Milvus has a free tier, so it costs nothing to try first.
  • Each has a real cost: Milvus vector dimensions are capped at 32,768; Writer pricing is not publicly disclosed and requires a sales conversation, unlike consumer AI writing tools.
  • They diverge on capability: Milvus covers Billion-scale vectors, Writer covers Palmyra LLMs.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Milvus and Writer actually diverge.

Attributes where Milvus and Writer differ
AttributeMilvusWriter
Starting priceFreeOn request
Pricing modelfreemiumquote
Free tierYesNo
PlatformsLinux, Mac, Windows, Webweb, api
CategoryMachine LearningAI
Founded20172020

Identical on both: 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 Writer

  • Palmyra LLMs
  • Knowledge Graph
  • No-code agent builder
  • Brand compliance
  • AI writing assistant
  • Enterprise security controls

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 Writer
  • Storing and querying embeddings for retrieval augmented generationnot Writer
  • Similarity search over images, audio or text at scalenot Writer

Writer

  • Enterprise marketing content generationnot Milvus
  • AI-powered knowledge assistants grounded in company datanot Milvus
  • Building custom generative AI agents without codenot Milvus
  • Brand and compliance-consistent copywriting at scalenot 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

Writer

  • Pricing is not publicly disclosed and requires a sales conversation, unlike consumer AI writing tools.
  • Its proprietary Palmyra models are less widely benchmarked and documented than general-purpose models like GPT or Claude.
  • Primarily positioned for large enterprises, making it less accessible or cost-effective for individuals and small teams.

Pricing, plan by plan

Milvus

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

Writer

On request
  • Starter$undefined/month
    • For teams starting with agentic AI
    • Up to 5 users
    • 14-day free trial, no card required
  • Enterprise$undefined/month
    • Contact sales
    • Unlimited users, teams and free collaborators
    • Lite seats for invited users

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 Writer if

  • You need palmyra llms.
  • You work on web, api.
  • You also want knowledge graph.
Writer review

Questions people ask

Is Milvus or Writer better?
Neither clearly leads. Milvus starts at Free and Writer at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Milvus or Writer?
Milvus has a free tier; the other does not. Paid plans start at Free for Milvus and On request for Writer.
Does Milvus or Writer run on more platforms?
Milvus runs on Linux, Mac, Windows, Web. Writer runs on web, api.
Can I use Milvus for free?
Yes. Milvus has a free tier, so you can try it without paying. Writer starts at On request.
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 Writer is typically brought in for.
What can Milvus do that Writer cannot?
Milvus covers Billion-scale vectors, Multiple index types, GPU acceleration, Hybrid search. Writer covers Palmyra LLMs, Knowledge Graph, No-code agent builder, Brand compliance.

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
Writer: What does Writer cost?

Writer does not publish prices. There are two tiers: Starter, for teams up to five users, with a 14-day free trial and no card required, and Enterprise, which is contact-sales and adds unlimited users and teams.

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
Writer: What is the difference between Pro and Lite seats?

Pro is the standard paid seat, with full access to create, customise and automate workflows. Lite seats exist only on Enterprise, letting invited users view and run existing playbooks with limited monthly Agent use before needing a Pro seat.

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
Writer: What does Writer do with customer data?

Writer states a zero data retention approach and says customers retain full ownership of their data. By default it does not train or improve its models on customer data, rather than requiring an opt-out.

Source
Writer: Which compliance standards does Writer meet?

Writer says it adheres to GDPR, HIPAA, SOC 2 Type II and PCI. HIPAA and SOC 2 Type II certifications and reports are available on request, and only for Enterprise plans.

Source
Writer: Are there discounts for nonprofits or education?

Yes. Writer offers 20% off the Starter and Enterprise plans to nonprofits and educational institutions, claimed by emailing from a nonprofit or .edu address.

Source
Share

Related pages

More on Milvus

More on Writer

Keep looking

Other head to heads