How Much Does a Custom Odoo App Cost?

Because the cost of a custom Odoo-connected app is driven almost entirely by how many distinct concerns it has to get right: authentication, how many Odoo models it reads or writes, whether it needs to handle edge cases like partial stock or backorders, how many user roles see different things. Two apps that sound similar in one sentence ("a portal for our customers") can differ in cost by a wide margin depending on those specifics. That said, vague "contact us for pricing" isn't useful either, so here are real numbers.

The smallest tier (Tiny) starts at From $390, for something like approval screen, simple report, small data entry tool. These are one-screen, one-workflow builds: a single Odoo model, a single clear action, no user roles to manage.

A polished, multi-screen application built around one workflow (the kind of build behind most of the example apps on this site) typically falls in the $490-$890 range. Where a specific build lands in that range depends on how many screens it needs, how many Odoo models it touches, and whether it only reads data or also writes back to Odoo (write-back integrations generally cost more, since they need more careful validation and error handling; see the guide on that distinction linked below). As a concrete anchor: a warehouse picking app starts at $590, while a customer ordering portal (which has to handle authentication, a per-customer catalog, and checkout) starts at $890.

Anything that stops being one focused workflow: multiple integrated apps, a system with several distinct user roles each seeing different data, or a workflow that turns out to need changes inside Odoo itself (a custom module) in addition to the external app. These are quoted individually rather than against a fixed tier, because at that scope the cost genuinely depends on specifics that a landing page can't responsibly generalize.

Whether the app needs to write back to Odoo, and how carefully. A read-only dashboard just displays numbers. If a query is slightly wrong, the fix is trivial and nothing in Odoo is at risk. An app that creates sales orders, confirms purchase orders, or updates stock has to handle what happens when a write fails partway through, when the data submitted doesn't actually satisfy Odoo's own validation, and when two people try to act on the same record at once. That extra care is real engineering time, and it's usually the difference between the low end and the high end of a given app's estimate.

Through a short scoping conversation about the actual workflow: which Odoo models it touches, how many screens, read-only or write-back, how many user roles. That's a more useful process than a generic quote calculator, since two projects with the same one-line description can have meaningfully different scope once the details are on the table.