[ Solutions ]

All your software,
one lab.

A software lab, not an agency. Every project starts with a fixed-price audit.

01Software rescueWe fix and finish software others left behind.
02SaaS & business softwareFrom MVP to the software your business runs on.
03Mobile appsiOS and Android apps, all the way through App Store approval.
04AI & agentsAI agents that actually do the work.
05AutomationBusywork runs on its own.
06SEO & AI visibilityFound on Google. Cited by AI.
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Lunarion Labs / Solutions / Mobile apps

Mobile app development company in New York

Mobile app development and rescue for iOS and Android: native or cross-platform, back end, in-app purchases, App Store and Google Play publishing.

[ The reality ]

Mobile apps

A mobile app is more than screens. It needs a back end for accounts and data, in-app purchases that follow Apple and Google rules, push notifications that actually arrive, and an update every year when iOS and Android change. We handle the whole chain, from the code to the server to store approval.

[ 03 / 06 ] · iOS and Android apps, all the way through App Store approval.

[ Our commitments ]What we guarantee.

100%in your name: code, accounts and access
0service downtime during the work
1senior lead, from first call to launch
4steps, always in this order

[ What we do ]

iOS and Android apps, all the way through App Store approval.

Rejected by Apple, crashing for users, or abandoned by your developer? We get your app stable, approved and shipping updates again.

  1. 01

    iOS and Android development

    One codebase with Flutter or React Native when it fits, native Swift and Kotlin when it is needed.

    [ Flutter ] [ React Native ] [ Native ]

  2. 02

    App Store and Google Play publishing

    Developer accounts, listings, privacy labels, review guidelines and answers to rejections.

    [ Accounts ] [ Listings ] [ Review ]

  3. 03

    In-app purchases and subscriptions

    StoreKit and Google Play Billing, subscriptions and restore purchases, done by the rules.

    [ StoreKit ] [ Play Billing ] [ Restore ]

  4. 04

    Back end and APIs

    Accounts, data, payments and an admin panel: the server your app runs on.

    [ API ] [ Database ] [ Admin ]

  5. 05

    Push notifications and offline

    Reliable push, background sync and offline mode.

    [ Push ] [ Sync ] [ Offline ]

  6. 06

    App rescue and takeover

    Flutter, React Native, FlutterFlow, Swift or Kotlin apps taken over, stabilized and shipping again.

    [ Audit ] [ Upgrade ] [ Stabilization ]

  7. 07

    Crash and performance fixes

    Crash tracking, startup time and battery use, so the app feels fast on every device.

    [ Crashlytics ] [ Profiling ] [ Fixes ]

  8. 08

    Yearly OS updates

    New iOS and Android versions, SDK requirements and new features, kept on schedule.

    [ Releases ] [ SDKs ] [ Features ]

[ What it lets you do ]

What changes,
in practice.

  • Keep customers coming back

    A branded appTargeted push notificationsLoyalty and rewards

  • Sell on mobile

    In-app purchases and subscriptionsApple Pay and Google PayCatalog and ordering

  • Equip field teams

    Offline forms and reportsPhotos, signatures, GPSSync when back online

  • Deliver a service

    Booking and schedulingLive status trackingMessaging with your team

  • Control devices

    Bluetooth connectivitySensor readingsRemote updates

  • Distribute content

    Video and coursesCommunity featuresSubscription access

[ How we work ]

Four steps,
in this order.

  1. 01Audit or scope

    The state of your current app, or the scope of version one.

  2. 02Build

    App, back end and admin panel, tested on real devices.

  3. 03Publish

    Listings, privacy details, submission and replies to App Review.

  4. 04Maintain

    Crash monitoring, OS updates and new features.

[ Typical examples ]

What it
looks like.

Nothing changes for you. You just get time and money back.

A customer booking app

Bookings happen over the phone and slots get lost.

  • Taking bookings over the phone[ by hand ]
  • Calling customers the day before[ by hand ]
  • Handling cancellations by hand[ by hand ]

We plug into your tools.

  1. iOS and Android app with online booking
  2. Push reminders
  3. An admin panel for staff

Self-serve bookings and fewer no-shows.

  • Online booking, 24/7
  • Automatic reminders
  • Freed slots back on sale

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back.

Time back

The phone rings a lot less.

Money saved

Fewer lost slots and no-shows.

A field app for technicians

Job reports are filled out on paper and retyped at the office.

  • Filling out paper reports[ by hand ]
  • Retyping them at the office[ by hand ]
  • Emailing job summaries[ by hand ]

We plug into your tools.

  1. Offline forms with photos and signatures
  2. Automatic sync
  3. PDF reports emailed to the customer

Jobs documented on site, with no retyping.

  • Reports done on site, even offline
  • Automatic sync
  • A PDF emailed to the customer

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back.

Time back

No more retyping at the office.

Money saved

Faster invoicing after every job.

A subscription content app

Video courses that need to work on mobile, behind a paywall.

  • Sending video links by email[ by hand ]
  • Managing access by hand[ by hand ]
  • Collecting payments manually[ by hand ]

We plug into your tools.

  1. App with video player and progress tracking
  2. Store-native subscriptions
  3. Community space

A mobile offer that bills through the App Store and Google Play.

  • An app with player and progress
  • Subscription access
  • Payments through the app stores

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back.

Time back

Access manages itself.

Money saved

Recurring revenue.

Online ordering and loyalty

Phone orders pile up at rush hour and get lost.

  • Taking orders over the phone[ by hand ]
  • Scribbling notes during the rush[ by hand ]
  • Punch cards for loyalty[ by hand ]

We plug into your tools.

  1. Order-ahead app with prepayment
  2. Built-in loyalty program
  3. Orders sent straight to the kitchen

Clear, prepaid orders and customers who come back.

  • Order and pay in the app
  • Orders routed to the kitchen
  • Automatic rewards

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back. [ Your POS ]

Time back

The phone no longer blocks service.

Money saved

Higher order values through targeted offers.

A subscription coaching app

Programs go out as PDFs and subscriptions are tracked by hand.

  • Emailing programs[ by hand ]
  • Tracking subscriptions in a spreadsheet[ by hand ]
  • Chasing inactive clients[ by hand ]

We plug into your tools.

  1. Programs and videos in the app
  2. Workout and progress tracking
  3. Subscriptions through the stores

An offer that lives in your clients' pockets and bills on its own.

  • Programs in the app
  • Automatic subscriptions
  • Workout reminders

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back. [ App Store, Google Play ]

Time back

No more manual subscriber admin.

Money saved

Recurring revenue that renews itself.

A move-in / move-out inspection app

Inspections are done on paper, then retyped and emailed later.

  • Filling out paper forms[ by hand ]
  • Retyping the report[ by hand ]
  • Emailing the document[ by hand ]

We plug into your tools.

  1. Guided room-by-room checklist
  2. Photos, signatures and timestamps
  3. PDF sent to every party

A complete inspection signed on site, with no retyping.

  • Guided checklist on a tablet
  • Signature on site
  • PDF sent automatically

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back.

Time back

Hours of retyping saved every week.

Money saved

Fewer disputes thanks to timestamped photos.

[ What you get ]

What you
walk away with.

No vague promises: concrete items, handed over in your name, that you keep whatever happens.

  1. Deliverable 0101 / 05

    The app live on the App Store and Google Play

  2. Deliverable 0202 / 05

    Developer accounts in your company's name

  3. Deliverable 0303 / 05

    Source code and documentation

  4. Deliverable 0404 / 05

    An admin panel for content and users

  5. Deliverable 0505 / 05

    Crash reporting in place

[ When to call us ]

Sound familiar?

  • 01

    Apple or Google rejected your app.

  • 02

    It crashes for part of your users.

  • 03

    Nothing has shipped since your developer left.

  • 04

    In-app purchases or subscriptions do not work.

If one of these sounds like you, it is exactly what we do.

[ Who it is for ]

  • Profile 01

    Startups

    Your product lives on mobile and has to be solid from launch day.

  • Profile 02

    Businesses

    An app for your customers or field team, connected to your systems.

  • Profile 03

    Apps in trouble

    Rejected, unstable or abandoned, and it needs to ship again.

[ Technology ]

Flutter React Native Expo Swift Kotlin FlutterFlow Firebase Supabase RevenueCat

We pick the technology for your project, never the other way round. And we work with the one you already have.

[ In short ]

Mobile app development covers the iOS and Android app, its back end and admin panel, and getting it approved on the App Store and Google Play. Lunarion Labs, a New York software lab, builds new apps and rescues rejected, unstable or abandoned ones.

What are we talking about?

An app depends on far more than its interface: a back end for accounts and data, payment rules set by Apple and Google, reliable notifications, and yearly SDK and OS updates. An app that stops being maintained eventually can no longer be updated in the stores.

A mobile app is more than screens. It needs a back end for accounts and data, in-app purchases that follow Apple and Google rules, push notifications that actually arrive, and an update every year when iOS and Android change. We handle the whole chain, from the code to the server to store approval.

When should you call us?

  • Apple or Google rejected your app.
  • It crashes for part of your users.
  • Nothing has shipped since your developer left.
  • In-app purchases or subscriptions do not work.

How does an engagement work?

  1. Audit or scope. The state of your current app, or the scope of version one.
  2. Build. App, back end and admin panel, tested on real devices.
  3. Publish. Listings, privacy details, submission and replies to App Review.
  4. Maintain. Crash monitoring, OS updates and new features.

The starting point is always the same: the Lunarion audit, at a fixed price, which gives you a written, costed diagnosis. See our four-step approach.

Mobile apps: what is included

What drives the cost?

Every project is costed after the audit, which has a fixed price. The main factors are:

  • One or two platforms, native or cross-platform
  • The back end and admin panel to build or take over
  • In-app purchases and subscriptions
  • Hardware features such as camera, location or Bluetooth

Mistakes to avoid

  • Publishing under your developer's account instead of your company's
  • Ignoring Apple's rules on digital payments
  • Shipping without crash reporting
  • Falling behind on yearly SDK and OS requirements

Where do we work?

Lunarion Labs is a software lab based in New York that works fully remotely, in English and French. We work with companies in the US, France and Spain, including in these cities:

United States

New York, Los Angeles, Chicago, Houston, Dallas, Austin, Miami, San Francisco, Boston, Seattle.

France

Paris, Lyon, Marseille, Toulouse, Bordeaux, Lille, Nantes, Strasbourg, Nice, Montpellier.

Spain

Madrid, Barcelona, Valencia, Seville, Malaga, Bilbao.

Go further

[ Questions ]

Frequently
asked.

My app was rejected by Apple. Can you help?

Yes. We read the rejection, fix the cause and resubmit with the explanation App Review expects.

How long does it take for Apple to approve an app?

Apple's review usually takes from a few hours to a few days. A well-prepared submission avoids most back-and-forth.

How much does it cost to build an app?

It depends on platforms, back end, payments and hardware features. A fixed-price audit or scoping phase gives you a costed plan first.

Native or cross-platform?

Cross-platform covers most products. Native is worth it for specific hardware or performance needs. We tell you which during the audit.

Whose name are the developer accounts in?

Your company's. The app and the App Store and Google Play accounts belong to you.

[ Guides ]

Go
further.

All guides →
October 1, 2026 · 6 min read [ Project rescue ] [ SaaS ]How to switch software development companies without losing your code, data or appsSource code ownership, domain and hosting access, App Store and Google Play transfers: a step-by-step checklist to switch software development companies safely. October 1, 2026 · 4 min read [ Project rescue ] [ SaaS ]Software project rescue: rewrite vs refactor, and how to decideIs your software project failing? How to rescue it: the rewrite vs refactor decision, the strangler fig approach and six checks before you start over. October 1, 2026 · 4 min read [ SEO ]Website redesign SEO checklist: how to redesign without losing rankingsDoes a website redesign affect SEO? Yes, if rushed. Use this checklist: URL inventory, 301 redirects, metadata, staging, launch and monitoring.

[ Other solutions ]

Same lab,
other crafts.

01Software rescueWe fix and finish software others left behind.Discover →02SaaS & business softwareFrom MVP to the software your business runs on.Discover →04AI & agentsAI agents that actually do the work.Discover →05AutomationBusywork runs on its own.Discover →06SEO & AI visibilityFound on Google. Cited by AI.Discover →

[ Lunarion audit ]

Shall we look at
your project?

A few questions, then a written diagnosis with priorities and costs. Then you decide.