# Cohesivity vs Convex

Convex: “The reactive backend platform that keeps up with you and your agents.”

Convex has a clear idea about backends: your data, your functions, and the live queries that keep the frontend in sync should be one reactive system in TypeScript. It is a genuinely nice model for apps where the UI has to stay live, and Convex leans into coding agents with a plugin for them. You still sign up and connect a project before any of it runs.

Cohesivity is a different shape. Rather than a reactive TypeScript runtime, it is a set of standard services (Postgres, storage, auth, hosting, AI) that a coding agent provisions over one HTTP API, with no account. The project runs for 72 hours, then you claim it. So the choice is between Convex's opinionated reactive model that you sign into, and a plain, provisioned backend the agent stands up with no signup.

side by side

## Cohesivity and Convex, on the points that differ

__Comparison of Cohesivity and Convex__
|                | Cohesivity                                                          | Convex                                                                          |
| -------------- | ------------------------------------------------------------------- | ------------------------------------------------------------------------------- |
| model          | Standard services (Postgres, storage, auth, hosting, AI) over HTTP. | A reactive TypeScript backend: data, functions, and live queries as one system. |
| signup         | None. The agent provisions the project, then you claim it.          | Create a Convex account and connect a project before building.                  |
| database       | Managed Postgres, reached over HTTP.                                | Convex's own document database with reactive queries and ACID transactions.     |
| who sets it up | Your coding agent, over one HTTP API.                               | You, plus a Convex plugin inside your coding agent, against your project.       |
| billing        | Free $0, Plus $20, Pro $100, one shared balance.                    | Free starter, then per-developer and usage-based paid plans.                    |

where Cohesivity fits

- No account before the backend runs. The agent provisions everything, and you claim the project once it works. Convex's plugin still points at a project you signed up and connected.
- Standard Postgres, not a bespoke runtime. If you would rather build on plain SQL and HTTP than adopt a reactive framework, Cohesivity provisions managed Postgres.
- More than data and functions. Storage, hosting, auth, an AI gateway and a browser come from the same API, not just the reactive core.

when Convex is the better call

Pick Convex if reactivity is the point. When the whole app is about live, always-in-sync state, its query-and-mutation model removes a lot of the plumbing you would otherwise write by hand.

Pick Convex if you want an opinionated, all-TypeScript backend and you like its shape. For the right app, that consistency is a real productivity win.

The difference is philosophy. Convex is a framework you adopt and sign into. Cohesivity is a set of plain services the agent provisions with no signup. If the reactive model fits your app, Convex is built for it in a way a generic backend is not.

questions

### Is Cohesivity a Convex alternative?

For the case where you want a backend provisioned by an agent with no signup, and you would rather use standard Postgres and HTTP than a reactive TypeScript framework, yes. Convex is an opinionated reactive backend you sign up for; Cohesivity provisions plain services over one API and you claim the project later.

### Does Cohesivity have a reactive database like Convex?

No. Cohesivity provisions managed Postgres and a realtime service for live updates, but it does not offer Convex's reactive query model where the database, functions, and live queries are one system.

### Do I need to sign up like Convex requires?

No. A Cohesivity project runs 72 hours with no account and no card. You claim it later. Convex requires an account and a connected project first, even with its agent plugin.

### Can my agent provision the backend on its own?

Yes. The agent creates a project and provisions services with HTTP calls, with no dashboard step in between.

related comparisons

Convex details verified 2026-07-22 from convex.dev. Cohesivity details from its own docs. Features and pricing change, so check current terms with each provider.

Try it against Convex.

Copy the onboarding prompt and your agent stands up the backend in seconds.