Frequently Asked Questions

A web app MVP takes about 4 weeks from the signed quote. A mobile app takes longer, and the timeline is in your written quote. Try our app timeline calculator for a personalized estimate.

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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.

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Everything is in writing. You get written progress updates, pull requests you can review, and staging builds so you can test features as they’re completed. Simon, who builds the app, is your single point of contact. There are no standing meetings; live calls are available at $100 per 15 minutes.

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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, so we handle the technical complexity so you can focus on your business while staying informed and in control.

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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.

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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.

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For most businesses, cross-platform (Flutter) is the better choice: one codebase for iOS and Android usually costs less and ships sooner than two native apps. 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.

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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.

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AI is transforming apps through intelligent chatbots, personalized recommendations, predictive analytics, image/voice recognition, and workflow automation. Our AI integration service can add smart features to both new and existing applications.

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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.

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Yes. Plan a yearly maintenance budget from the start; our app maintenance cost guide explains what drives it. 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.

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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.

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Yes. 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.

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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.

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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.

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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.

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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.

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Offshore teams usually charge less per hour. App369's app cost guide gives rough market ranges, not measured averages: mid-tier US teams at about $100 to $150 an hour, Eastern Europe $40 to $80, South America $30 to $60 and Asia $20 to $50. Miami agencies listed on Clutch often set $10,000 or $25,000 minimum projects, and offshore teams can mean large time zone gaps. App369, in Miami, prices defined jobs instead, such as a web app MVP from $6,000 after a $450 written scoping.

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Four app development companies show a Miami street address on their own website: Foonkie Monkey, Leenspace, SpaceDev and Synergy Labs, and App369 is also based in Miami (see the Miami shortlist). A Miami address is not always a large local office: two of them list the same street address. None of the four publishes a project price, and their Clutch minimums start at $10,000 or more. App369 publishes that guide and is one of the options in it, so compare at least two; it lists a web app MVP from $6,000 after a $450 written scoping.

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App369, based in Miami, adds one LLM feature or agent to an app or internal tool you already run, as the AI Feature or Agent Build: $2,500 fixed, 10 business days after the spec is agreed and repo access and test keys arrive. It is built on the Claude or Gemini API, or another model API you already use, on your own provider account, with an eval set of up to 50 cases so you can see how well it works. You pay your model provider directly for usage.

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Start with the Miami and Boca Raton shortlists, which name the local firms and what each publishes. App369 builds for businesses in Miami-Dade, Broward and Palm Beach counties and works 9am to 6pm Eastern, Monday to Friday. Its MVP offer is a web app MVP from $6,000 after a $450 written scoping, and most MVPs take about 6 to 12 weeks depending on scope.

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Fixed price is better when the work can be described before it starts: you know the total upfront and the developer carries the risk. Hourly (time and materials) suits work that changes as it goes, and the client carries the risk. Many projects use both: a fixed-price first step, such as a diagnosis or an audit, then a fixed quote. App369 lists a fixed price for each of its offers, starting at a $450 bug diagnosis. Agencies sometimes quote a fixed bid too, so ask any developer what the price includes and excludes. See what fixed-price development means.

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As rough market planning ranges, not measured averages: a simple app, such as a to-do list or a basic booking app, costs about $15,000 to $50,000; a medium app, such as e-commerce, fitness tracking, social or food delivery, about $50,000 to $120,000; and a complex one, such as banking, healthcare or a marketplace, $120,000 to $300,000 or more. The app cost guide breaks down what drives each range.

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For Firebase, the current Owner adds your Google account as Owner, the project is linked to your Cloud Billing account (moving the bill needs rights on both billing accounts, so the outgoing developer usually has to take part), the Google Analytics property is moved separately, and then the old owner's roles are removed. If the app is published from the old developer's own accounts, Apple's App Transfer is started by their Account Holder and Google Play's app transfer is submitted from their account. If it is published from your own developer accounts, you change who has access by changing users. If the iOS app moves to your Apple account, upload an APNs key from it so push notifications keep working. Step by step: transfer a Firebase project and the app handover checklist.

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Cross-platform usually costs less because one team builds both apps: native for iOS and Android typically needs 4 to 6 developers, cross-platform 2 to 3. As a rough estimate, not survey data, a simple app runs about $25,000 to $80,000 built natively for both platforms against $15,000 to $50,000 in Flutter. Native wins when you need peak performance, deep hardware access or platform-specific features. See native vs cross-platform and the Flutter cost guide.

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Build a PWA when budget and reach matter most: one codebase runs on every platform and browser, users need no app store download, and it suits content-driven apps, dashboards and internal or B2B tools. Build native when you need hardware such as Bluetooth, NFC or AR, complex offline sync, platform features such as widgets or Apple Watch, or an App Store listing for trust. Full comparison: PWA vs native.

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A speed service is worth it when it names what it will fix and works on a copy of your theme. Look for image, app script, font, Liquid and layout shift fixes, a checkout review, and a before-and-after report, with no guaranteed score. App369's Shopify Speed and Checkout Tune-Up is $750 fixed, 5 business days after collaborator or staff access (Themes and Apps only) is granted. All work happens on a duplicate theme that you review and publish yourself.

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Simon Dziak is the founder and lead developer of App369. Simon also built and runs Workspace369, a production Flutter and Firebase platform with a native iOS app. Based in Miami, 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.

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Absolutely. You don’t need a technical background to start with us. 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 consultation ($100 per 15 minutes, paid upfront) to explore your idea.

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