The full answer
Platforms come first. One cross-platform app in Flutter or React Native covering iOS and Android costs less than two native apps in Swift and Kotlin, though native is sometimes the right call for performance or deep hardware use. Most apps also need a web admin panel and a back end, which are often a larger share of the work than the app itself.
Features that look small on a screen can be large underneath. Real-time order tracking, chat, offline sync, video, background location, biometric login and multi-language support with Arabic right-to-left layouts each add design, engineering and testing effort. Payments add integration with gateways such as UPI, KNET or local Gulf providers, plus security review.
Compliance and data rules add work in regulated sectors: HIPAA for health apps, PCI DSS through certified payment providers, PDPL, DPDP or GDPR for personal data, and data residency in a specific region. Design depth matters too, from a clean standard interface to custom animation and a full design system.
Creuto reduces cost by scoping a focused first release, reusing proven architecture and testing with automation on a device matrix rather than fixing bugs after launch. App Store and Google Play submission, analytics and crash reporting are included in scope. A discovery call gives you a fixed-scope proposal with the budget broken down.