Software · head to head
PostgreSQL vs Convex
PostgreSQL
Software
The world's most advanced open source relational database
- From
- Free
- Rated
- -
Convex
Software
The reactive backend platform that keeps up with you and your agents
- From
- On request
- Rated
- -
The short version
- Only PostgreSQL has a free tier, so it costs nothing to try first.
- Each has a real cost: PostgreSQL requires manual scaling across multiple machines for very large deployments; 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.
Where they differ
Only the attributes on which PostgreSQL and Convex actually diverge.
| Attribute | PostgreSQL | Convex |
|---|---|---|
| Starting price | Free | On request |
| Pricing model | Unknown | usage-based |
| Free tier | Yes | No |
| Platforms | Linux, Windows, macOS, BSD, Unix | Web |
| Founded | 1996 | Unknown |
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 PostgreSQL
- ACID Compliance
- JSON/JSONB Support
- Full-text Search
- Extensibility
- Advanced Indexing
- Partitioning
- Replication
- pgAdmin
Only in Convex
Nothing recorded that PostgreSQL does not also cover.
What people use each for
The jobs each tool is most often brought in to do.
PostgreSQL
- Transaction processingnot Convex
- Data storagenot Convex
- Application backendnot Convex
- Reportingnot Convex
- Data analyticsnot Convex
Convex
No use cases recorded yet. See the Convex review.
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
PostgreSQL
- Requires manual scaling across multiple machines for very large deployments
- Performance tuning requires deep knowledge of database internals
- No built-in graphical admin interface; command-line tools are primary method
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.
Pricing, plan by plan
PostgreSQL
FreeNo published plan breakdown. See the PostgreSQL review.
Convex
On requestNo published plan breakdown. See the Convex review.
Which should you pick?
Choose PostgreSQL if
- You need acid compliance.
- You want to start without paying.
- You work on Linux, Windows, macOS, BSD, Unix.
- You also want json/jsonb support.
Choose Convex if
Nothing in the data separates Convex from PostgreSQL on the points above - pick on price and on how each one feels to use.
Questions people ask
- Is PostgreSQL or Convex better?
- Neither clearly leads. PostgreSQL starts at Free and Convex at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, PostgreSQL or Convex?
- PostgreSQL has a free tier; the other does not. Paid plans start at Free for PostgreSQL and On request for Convex.
- Does PostgreSQL or Convex run on more platforms?
- PostgreSQL runs on Linux, Windows, macOS, BSD, Unix. Convex runs on Web.
- Can I use PostgreSQL for free?
- Yes. PostgreSQL has a free tier, so you can try it without paying. Convex starts at On request.
- What is PostgreSQL best used for?
- PostgreSQL is most often used for transaction processing, data storage, application backend, reporting. Of those, transaction processing and data storage are not what Convex is typically brought in for.
- What can PostgreSQL do that Convex cannot?
- PostgreSQL covers ACID Compliance, JSON/JSONB Support, Full-text Search, Extensibility.
Answered from the vendors’ own pages
PostgreSQL: Is PostgreSQL completely free?
Yes. PostgreSQL is completely free and open source with no licensing fees or restrictions on use.
SourcePostgreSQL: What platforms does PostgreSQL run on?
PostgreSQL runs on all major operating systems including Linux, Windows, macOS, BSD, and commercial Unix variants, and has been proven highly scalable managing terabytes to petabytes of data.
SourcePostgreSQL: What procedural languages are supported?
PostgreSQL supports stored functions and procedures in multiple languages including PL/pgSQL, Perl, Python, Tcl, Java, JavaScript, R, and Rust.
SourcePostgreSQL: What is ACID compliance in PostgreSQL?
PostgreSQL has been ACID-compliant since 2001, ensuring data integrity through atomicity, consistency, isolation, and durability guarantees for all transactions.
SourcePostgreSQL: Does PostgreSQL support JSON data?
Yes. PostgreSQL supports JSON and JSONB data types for storing and querying JSON documents, along with XML and other document formats.
Source