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Software · head to head

Convex vs DataStax

C

Convex

Software

The reactive backend platform that keeps up with you and your agents

From
On request
Rated
-
Full reviewWebsite
DataStax logo

DataStax

Software

The real-time data company for AI applications

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only DataStax has a free tier, so it costs nothing to try first.
  • Each has a real cost: Convex the Free and Starter tier includes only 1 million function calls and 0.5 GB of database storage per month before per-unit overage charges of $2.20 per million calls apply, as of August 2026.; DataStax dataStax's own Astra DB documentation states the Enterprise plan is an annual, contract-based plan with negotiated pricing, meaning list prices are not published for that tier

Where they differ

Only the attributes on which Convex and DataStax actually diverge.

Attributes where Convex and DataStax differ
AttributeConvexDataStax
Starting priceOn requestFree
Pricing modelusage-basedfreemium
Free tierNoYes
PlatformsWebWeb, Aws, Azure, Gcp
FoundedUnknown2010

Identical on both: user rating (Not yet rated), category (Unknown).

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 Convex

Nothing recorded that DataStax does not also cover.

Only in DataStax

  • Cassandra Compatible
  • Vector Search
  • Serverless
  • Multi-cloud
  • Streaming
  • CDC
  • GraphQL API
  • LangChain

What people use each for

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

Convex

No use cases recorded yet. See the Convex review.

DataStax

  • Real-time applicationsnot Convex
  • Content managementnot Convex
  • User profilesnot Convex
  • Mobile backendsnot Convex
  • Cachingnot Convex

Where each one falls short

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

Convex

  • The Free and Starter tier includes only 1 million function calls and 0.5 GB of database storage per month before per-unit overage charges of $2.20 per million calls apply, as of August 2026.

DataStax

  • DataStax's own Astra DB documentation states the Enterprise plan is an annual, contract-based plan with negotiated pricing, meaning list prices are not published for that tier
  • DataStax's Astra DB documentation directs Standard plan customers to IBM's watsonx.data pricing for exact consumption-based rates following the DataStax/IBM deal, rather than publishing them on DataStax's own site

Pricing, plan by plan

Convex

On request

No published plan breakdown. See the Convex review.

DataStax

Free
  • FreeFree
    • 5GB storage
    • 40M read/write ops
    • Vector search
  • Pay As You GoFree
    • Usage-based pricing
    • Multi-region
    • Enterprise support

Which should you pick?

Choose Convex if

Nothing in the data separates Convex from DataStax on the points above - pick on price and on how each one feels to use.

Convex review

Choose DataStax if

  • You need cassandra compatible.
  • You want to start without paying.
  • You work on Web, Aws, Azure, Gcp.
  • You also want vector search.
DataStax review

Questions people ask

Is Convex or DataStax better?
Neither clearly leads. Convex starts at On request and DataStax at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Convex or DataStax?
DataStax has a free tier; the other does not. Paid plans start at On request for Convex and Free for DataStax.
Does Convex or DataStax run on more platforms?
Convex runs on Web. DataStax runs on Web, Aws, Azure, Gcp.
Can I use DataStax for free?
Yes. DataStax has a free tier, so you can try it without paying. Convex starts at On request.
What can Convex do that DataStax cannot?
DataStax covers Cassandra Compatible, Vector Search, Serverless, Multi-cloud.
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Related pages

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