The full answer
Fixed price works when the first release can be described clearly: the user types, journeys, integrations and platforms. Creuto's discovery session exists to reach that clarity, and the proposal that follows sets out the budget breakdown, milestones and timeline. Payments are tied to milestones, so you pay as working software is delivered.
The usual worry about fixed price is rigidity. Creuto handles that with a written change request process: when you want something outside the agreed scope, the team assesses the effect on scope, time and budget, and the change proceeds on your approval. You stay in control of the budget without losing the ability to adapt.
A dedicated team or retainer suits products that are already live and keep evolving, teams that need extra capacity, or roadmaps that will be reprioritised every sprint. You pay for a stable team over a period and direct its work in two-week sprints with demos at the end of each one.
Many clients combine the two: a fixed-scope build for the first release, followed by a retainer for post-launch iteration and support. The discovery call is where Creuto recommends the model, and the team will say plainly if your project is not yet defined enough for a fixed price.