Database & Data Management · head to head
Convex vs PostgreSQL
Convex
Database & Data Management
The reactive backend platform that keeps up with you and your agents
- From
- On request
- Rated
- -
PostgreSQL
Database & Data Management
The world's most advanced open source relational database
- From
- Free
- Rated
- -
The short version
- Only PostgreSQL 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.; PostgreSQL requires manual scaling across multiple machines for very large deployments
Where they differ
Only the attributes on which Convex and PostgreSQL actually diverge.
| Attribute | Convex | PostgreSQL |
|---|---|---|
| Starting price | On request | Free |
| Pricing model | usage-based | Unknown |
| Free tier | No | Yes |
| Platforms | Web | Linux, Windows, macOS, BSD, Unix |
| Founded | Unknown | 1996 |
Identical on both: user rating (Not yet rated), category (Database & Data Management).
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 PostgreSQL does not also cover.
Only in PostgreSQL
- ACID Compliance
- JSON/JSONB Support
- Full-text Search
- Extensibility
- Advanced Indexing
- Partitioning
- Replication
- pgAdmin
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.
PostgreSQL
- Transaction processingnot Convex
- Data storagenot Convex
- Application backendnot Convex
- Reportingnot Convex
- Data analyticsnot 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.
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
Pricing, plan by plan
Convex
On requestNo published plan breakdown. See the Convex review.
PostgreSQL
FreeNo published plan breakdown. See the PostgreSQL review.
Which should you pick?
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.
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.
Questions people ask
- Is Convex or PostgreSQL better?
- Neither clearly leads. Convex starts at On request and PostgreSQL at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Convex or PostgreSQL?
- PostgreSQL has a free tier; the other does not. Paid plans start at On request for Convex and Free for PostgreSQL.
- Does Convex or PostgreSQL run on more platforms?
- Convex runs on Web. PostgreSQL runs on Linux, Windows, macOS, BSD, Unix.
- 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 can Convex do that PostgreSQL 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