Mobile Apps

    iOS and Android
    App Development

    Design and develop mobile apps around a defined user need. We scope iOS and Android delivery, backend integrations, store submission, promotion and ongoing support separately, with acceptance criteria agreed before implementation.

    Discuss scope

    Service scopes

    iOS App Building

    Εξατομικευμένη προσφορά

    • Agreed iOS screens, user flows and supported devices.
    • Implementation and testing of the specified features and API connections.
    • Release build and submission materials; Apple controls review and approval.
    Discuss scope

    Android App Building

    Εξατομικευμένη προσφορά

    • Agreed Android screens, user flows and supported OS/device range.
    • Implementation and testing of the specified features and API connections.
    • Release build and Google Play submission materials; approval is not guaranteed.
    Discuss scope

    iOS App Promotion

    750 USD–1.500 USD/έργο

    • App Store listing review, keyword hypotheses and screenshot briefs.
    • Apple Search Ads setup and measurement when included in the proposal.
    • Media spend and partner fees are separate; no guaranteed installs or rankings.
    Discuss scope

    Android App Promotion

    750 USD–1.500 USD/έργο

    • Google Play listing review, descriptions and visual briefs.
    • Agreed Google Ads campaigns and install-event measurement.
    • Advertising spend is separate; only genuine, voluntary user reviews.
    Discuss scope

    UI/UX Design

    2.000 USD–4.000 USD/έργο

    • User-flow review, wireframes and an interactive prototype.
    • Agreed screen designs, reusable components and developer specifications.
    • Usability research or participant recruitment only where explicitly scoped.
    Discuss scope

    App Maintenance & Support

    Εξατομικευμένη προσφορά

    • An agreed issue backlog, dependency updates and release process.
    • Crash/performance review using available telemetry and approved access.
    • Support hours, response arrangements and feature work are defined separately; no uptime guarantee.
    Discuss scope

    How we work

    Visible scope

    Screens, platforms, integrations and acceptance criteria are documented before work is agreed.

    Separate workstreams

    Development, promotion and support have their own deliverables and cost boundaries.

    Release handover

    Agree repository access, build materials, account ownership and maintenance responsibilities.

    Αντικείμενο, όρια και ξεχωριστά έξοδα

    Αμοιβή σε USD για το αναφερόμενο αντικείμενο. Φόροι, διαφήμιση, λογισμικό/API και έξοδα τρίτων είναι ξεχωριστά, εκτός αν περιλαμβάνονται ρητά. Η ρύθμιση είναι ξεχωριστή. Αντικείμενο και όροι συμφωνούνται πριν την εργασία.

    Το αναλυτικό αντικείμενο παρακάτω είναι στα αγγλικά· η γλώσσα εκτέλεσης συμφωνείται στην ατομική προσφορά.

    One brand, market and delivery language unless stated otherwise. Caps are work limits, not outcome promises. Client supplies lawful data, access and material rights. Public AI actions and content require agreed review. No rankings, leads, revenue, hiring or third-party approval guarantees.

    Contract, payment schedule, cancellation, hour rollover and support SLA require an explicit agreement. Legal, tax, investment and regulated work require the appropriate jurisdiction and an authorised professional role; this fee is not evidence of licensure.

    iOS App BuildingΕξατομικευμένη προσφορά

    Quote/project. Actual iOS software delivery requires separate discovery/prototype/build SOWs, backend, integrations, device/OS matrix, acceptance and launch responsibilities. Discovery is not a completed app.

    Android App BuildingΕξατομικευμένη προσφορά

    Quote/project. for actual Android delivery; device/OS testing, backend and distribution specified, rather than assuming the iOS scope/total is interchangeable.

    iOS App Promotion750 USD–1.500 USD/έργο

    for a base ASO audit + metadata recommendation for one app, one store, one market/language, three competitor reviews and one revision. Paid acquisition, ongoing testing, new creative production and PR/influencers separately quoted, not included in this base.

    Android App Promotion750 USD–1.500 USD/έργο

    for the same bounded Google Play ASO baseline, not combined iOS + Android or ongoing ad execution. Broader campaign quoted.

    UI/UX Design2.000 USD–4.000 USD/έργο

    for one core flow, up to eight screens, clickable design prototype/handoff and two revision rounds, one brand/language. Paid user research/testing and additional flows quoted. No production app included.

    App Maintenance & SupportΕξατομικευμένη προσφορά

    Quote/month after code assessment. with included triage/implementation hours, supported platforms and working-hours response terms explicitly capped. Historical remediation, new features, major OS migrations, hosting and 24/7 operations separate.

    Επικοινωνία

    Discuss your project

    Share your goals, existing systems and constraints so we can prepare a scoped proposal.

    Κάνοντας κλικ, συναινώ στην επεξεργασία των προσωπικών μου δεδομένων. Απόρρητο

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    Frequently asked questions

    How is app development priced?

    The proposal identifies platforms, screens, backend work, integrations, testing and release responsibilities. Design, promotion and maintenance are separate scopes; store accounts, hosting, licenses and ad spend are separate third-party costs.

    How is the delivery schedule agreed?

    The schedule follows requirements, available assets, API access and review steps. Changes can affect milestones; store review time and approval are outside our control.

    Should we start with iOS or Android?

    Use your audience device data, distribution market and required features to choose. Native and cross-platform approaches have different trade-offs; we assess them against the agreed requirements rather than assuming one is always better.

    Does an app guarantee revenue or compliance?

    No. Monetization depends on the offer, adoption and operating costs. Payment, privacy and regulated-use requirements need project-specific review; development or store submission does not certify compliance.

    Ανάπτυξη εφαρμογών iOS και Android | KeyGroup