Frequently Asked Questions

Custom app development typically ranges from $15,000 for a simple MVP to $300,000+ for enterprise applications. At App369, most projects fall between $15,000 and $150,000, with 98% delivered on-budget. The final cost depends on complexity, platform choices, and feature requirements. Get a personalized estimate with our estimate creator.

The biggest cost drivers are: feature complexity (simple CRUD vs. real-time, AI, payments), platform choice (iOS-only vs. cross-platform), design requirements (standard UI vs. custom animations), third-party integrations (APIs, payment gateways, CRMs), and backend infrastructure (simple database vs. scalable cloud architecture). Read our detailed 2026 app development cost guide for full breakdowns by app type.

Yes. Flutter development lets you build iOS, Android, and web from a single codebase, reducing costs by 30–40% compared to building separate native apps. You also save on long-term maintenance since updates only need to be made once. Flutter is used by 42% of developers worldwide and powers apps for Google, BMW, and Toyota.

We offer flexible payment structures based on project scope. Most projects use a milestone-based model — you pay in installments tied to completed deliverables (e.g., design approval, beta build, final launch). For ongoing work, we offer monthly retainer options. We never require 100% upfront. See our fee structure for details.

Our minimum engagement starts at $10,000, which typically covers a focused MVP or a specific feature build. For projects with smaller budgets, we offer our MVP development service designed to validate your idea with the essential features first, then scale based on user feedback.

Yes. After our initial discovery phase, we provide a detailed fixed-price proposal with a clear scope of work, timeline, and deliverables. This protects you from unexpected cost overruns. If scope changes arise during development, we discuss and agree on adjustments before any additional work begins.

Based on our delivery data from 150+ projects: simple apps take 8–12 weeks, medium-complexity apps require 3–5 months, and enterprise applications take 6–12 months. Using Flutter for cross-platform development accelerates timelines by approximately 35%. Try our app timeline calculator for a personalized estimate.

We follow an agile development process with six phases: 1) Discovery & Strategy — understanding your goals and users. 2) UI/UX Design — wireframes and interactive prototypes. 3) Development — building in 2-week sprints with regular demos. 4) QA & Testing — thorough testing across devices. 5) Launch — app store submission and deployment. 6) Post-Launch Support — monitoring, updates, and iteration.

You get full visibility throughout development. We provide bi-weekly sprint demos where you see working features, a shared project board (Jira/Linear) for real-time task tracking, and a dedicated project manager as your single point of contact. Most clients also get access to staging builds so you can test features as they’re completed.

Absolutely. We believe the best products come from close collaboration. You’ll be involved in design reviews, sprint demos, and key decision points throughout the project. That said, we respect your time — we handle the technical complexity so you can focus on your business while staying informed and in control.

To provide an accurate estimate, we need: a description of your app idea and its core purpose, your target audience, key features and functionality you envision, any design preferences or brand guidelines, and your budget range and timeline expectations. Don’t worry if you don’t have everything figured out — our consultation service helps shape ideas into actionable plans.

Yes. We build for iOS, Android, and web — often simultaneously using Flutter. We also offer dedicated iOS (Swift) and Android (Kotlin) development for projects requiring native-only capabilities like advanced AR or platform-specific hardware integrations.

For most businesses, cross-platform (Flutter) is the better choice — it delivers near-native performance at 30–40% lower cost and faster timelines. Choose native only if you need advanced platform-specific features (advanced ARKit, Bluetooth LE, or NFC). We cover this in depth in our native vs. cross-platform comparison.

Our core stack includes: Flutter & Dart for cross-platform mobile, Swift and Kotlin for native iOS/Android, Vue.js & Nuxt for web applications, Firebase & Google Cloud for backend and infrastructure, and Node.js for custom APIs. We choose technologies based on your project’s specific needs. See our full technology stack.

AI is transforming apps through intelligent chatbots, personalized recommendations, predictive analytics, image/voice recognition, and workflow automation. We help businesses integrate AI using platforms like OpenAI, Google Cloud AI, and custom ML models. Our AI integration service can add smart features to both new and existing applications.

Apple and Google release major OS updates annually, which can affect app compatibility. With our maintenance service, we proactively test your app against beta OS releases and apply necessary updates before the public launch. This ensures your users never experience broken functionality after updating their devices.

Yes. Industry best practice suggests budgeting 15–20% of initial development cost annually for maintenance. We offer flexible maintenance packages covering bug fixes, OS compatibility updates, performance optimization, security patches, and feature enhancements — all available on an a la carte or retainer basis.

We recommend minor updates every 2–4 weeks (bug fixes, performance improvements) and major feature updates quarterly. Regular updates signal to app store algorithms that your app is actively maintained, which can improve your search ranking. We also recommend updating immediately when critical security patches are needed.

Yes. We regularly take over projects from other agencies or in-house teams. We start with a thorough code audit to assess the current state, identify technical debt, and create a roadmap for improvements. Whether you need bug fixes, new features, or a complete refactor, we can work with most modern tech stacks.

Yes. We handle the entire submission process including app store asset creation (screenshots, descriptions, metadata), compliance review, submission, and any revision requests from Apple or Google reviewers. We also optimize your store listing for App Store Optimization (ASO) to maximize organic downloads.

IP ownership and source code rights are defined in the contract for each project. We offer flexible arrangements — including full IP transfer, shared licensing, or work-for-hire agreements — depending on the scope and nature of the engagement. We recommend discussing IP terms early in the process so both sides are aligned before development begins. Contact us to discuss your specific needs.

Absolutely. We sign Non-Disclosure Agreements before any project discussions begin. Your idea, business data, and proprietary information are protected from the very first conversation. We take confidentiality seriously — it’s fundamental to the trust our clients place in us.

Security is built into every phase of development. We implement encrypted data transmission (TLS/SSL), secure authentication (OAuth 2.0), encrypted data storage, role-based access controls, and regular security audits. For sensitive applications (healthcare, finance), we follow industry-specific compliance frameworks like HIPAA and PCI-DSS.

We build privacy-by-design into every application. This includes user consent management, data minimization, right-to-deletion functionality, and clear privacy policies. For apps serving EU users, we ensure full GDPR compliance. We also help with CCPA (California), PIPEDA (Canada), and other regional data protection regulations as needed.

App369 has delivered over 150 applications since 2018, maintaining a 4.9/5 average rating across client reviews. Unlike large agencies where your project gets lost in a queue, our founder personally oversees every project. We combine enterprise-grade technical capabilities with the responsiveness and care of a boutique studio. See what our clients say on our testimonials page.

Simon Dziak is the founder and lead developer of App369. With over 12 years of software development experience, Simon has personally architected and delivered 150+ applications across industries including fintech, healthcare, e-commerce, and education. Based in South Florida, he founded App369 with a mission to make professional app development accessible to businesses of all sizes. Simon is hands-on with every project, ensuring quality from architecture to deployment. Learn more on our about page.

We serve a wide range of industries including fintech, healthcare, e-commerce, education, real estate, manufacturing, and more. Each industry has unique requirements and compliance needs — our experience across sectors means we understand the specific challenges your business faces. Browse all industries we serve.

Absolutely. Many of our clients come to us with just an idea and no technical background. That’s exactly what we’re here for. We guide you through the entire process from concept to launch — translating your vision into technical requirements, designing intuitive interfaces, and building a product your users will love. Start with a free consultation to explore your idea.

Yes, both. For startups, we specialize in MVP development — building lean, validated products that attract users and investors. For enterprise clients, we deliver scalable, secure applications that integrate with existing systems and meet strict compliance requirements. Our portfolio spans solo founders to Fortune 500 companies. See our case studies for examples.