Fixed written scope
Price maps to a deliverable list. Changes are explicit. Good when you can decide in and out of v1.
Open ended hours
Useful for unknown rescue work, but easy to confuse with “progress”. We do not publish hourly rates here because the offer is scoped work, then a quote.
Existing apps
Still a list: bugs and features named up front. See the existing app quiz.
Also linked from first version checklist.