Appther is a mobile app development company in Chicago that designs and ships custom iOS, Android and AI-powered apps for Illinois businesses. Since 2018 we have delivered 200+ products for finance, healthcare, logistics, retail and food brands, with a US-facing team that works in Central Time and a fixed price agreed before the first sprint.
Consult Our Chicago ExpertsProduct teams that ship with Appther
Our app developers in Chicago build for a city that runs on trading floors, hospital networks, freight yards and quick-service kitchens. Every app we ship is engineered to stay fast on a crowded CTA platform, secure under the strictest biometric privacy law in the country, and simple enough that a first-time user finishes the job in one session.
Native Swift and Kotlin apps, or one Flutter or React Native codebase for both stores
In-app AI: search, recommendations, assistants and forecasting trained on your own data
Backends and APIs on AWS, Azure or Google Cloud, load-tested before launch day
BIPA, HIPAA, PCI DSS and WCAG handled in the architecture, not after the audit
Two-way integration with ERP, CRM, EHR, payment and warehouse systems
User research, design systems and App Store and Google Play release management
From a Fulton Market startup shipping its first MVP to a Loop enterprise replacing a ten-year-old field app, our app developers in Chicago cover the whole mobile stack. Pick the service that fits, or bring us the problem and we will recommend the platform.
Our iOS app development in Chicago is built for teams that need Swift and SwiftUI apps to pass App Review the first time. We use Core Data, Combine, Core ML and HealthKit where the product calls for it, sign and ship through Fastlane and TestFlight, and support Apple Business Manager for private distribution to your own workforce.
Android app development in Chicago with Kotlin and Jetpack Compose, tested on the mid-range devices your customers and field staff actually own rather than the newest flagship. We handle Play Console policies, Play Integrity, background-work limits and the fragmentation that sinks rushed builds.
One Dart codebase for iOS, Android, web and desktop, rendered at 60 frames per second with pixel-level control of the interface. Our Flutter developers use it when a Chicago business needs both stores covered on one budget without the compromises of a web wrapper.
For companies whose product teams already live in JavaScript and TypeScript, React Native lets web and mobile share logic, components and engineers. We build on the new architecture with Hermes and Expo where it fits, and drop to native modules when it does not.
Apps for watchOS and Wear OS, plus companion apps for Bluetooth and connected devices: patient monitors, fleet sensors, smart-building controls and retail hardware. Our IoT app development team pairs the mobile layer with the device firmware and the cloud pipeline behind it.
Most mobile products need a web surface too: an admin console, a customer portal, a partner dashboard. We build them in React and Next.js on the same backend as the app, so custom software development in Chicago does not end at the phone screen.
Installable, offline-capable web apps for cases where a store listing is overkill: internal tools, event apps, kiosk experiences and B2B ordering. Our hybrid and PWA builds use service workers, background sync and push where the browser supports it.
Apps with an assistant, a recommendation engine or a camera that understands what it sees. Our AI development practice adds LLM features, predictive models and computer vision to mobile products, with the data handling and cost controls to run them in production.
Whether it launches to consumers on Michigan Avenue or to a workforce spread across Cook County, an app built here has to survive real load, real audits and real winters of offline use. Tell us the idea and we will map the build.
Start With a Free Scoping Call
Six products from our portfolio, each with the problem the client brought us, what we built, and the result they can point to. Every figure comes from the published case study.
Lyftup needed passenger, driver and admin apps that dispatch intelligently, price transparently and stay fast when demand spikes at closing time.
Three apps on a shared backend: smart dispatch, live tracking, in-app payments and an admin control center for fleet owners.
Lyftup · Ride-hailingExisting wellness apps buried anxious users under long onboarding and complex meditation libraries when they needed relief in seconds.
A mobile-first app with guided breathing, 21-day anxiety reset programs and panic relief that starts from the first tap.
DeepRest · Mental wellnessPatients could record an ECG in minutes but waited days for a specialist to read it, with protected health data at every step.
A patient iOS app and a clinician reading portal on one secure backend, with HIPAA-grade storage, access control and audit logging.
KALBI · TelecardiologyA fintech startup needed a wallet that worked without a bank link, for customers who are paid, save and shop in cash.
Instant P2P transfers, QR payments and an agent cash-in and cash-out network, launched in six languages.
Digital wallet · FintechA satellite broadcaster wanted its live channels, films and sports on every screen without losing living-room quality.
Multi-platform OTT apps with adaptive streaming, casting, an on-demand catalogue and an admin control center for content.
Ideal TV · OTT streamingInstitutions ran courses, live classes, assessments and attendance across disconnected tools that no single role could see end to end.
A custom LMS with course management, live classes, assignments, attendance and performance analytics for students, faculty and administrators.
LMS · Education"Appther exceeded every expectation, on time, on budget, and the final product has been instrumental in scaling our business. A rare engineering partner."
Johnathan PefferCEO, Bull's Eye Technologies Inc"Building a mental health app means every detail, tone, flow, and privacy, has to be handled with care, and Appther got that from day one. They translated a sensitive subject into a product that feels warm, simple, and genuinely helpful."
Bob SinghalProfessor of Joy, Joyscore Inc"Appther built our student competition app and portal exactly the way we envisioned it: easy registration, smooth judging workflows, and real-time results that keep participants engaged. Our coordinators no longer chase spreadsheets."
Dionna MilemOwner, My BOB Team LLCWe are a mobile app development company in Chicago that builds for the sectors that define the city: the exchanges and fintechs of the Loop, the hospital systems along the Illinois Medical District, the freight and rail operators that make Chicago the country's logistics hub, and the food brands that started delivery culture here. Each app is shaped around the workflow, the regulator and the user of that sector.
Illinois has the strictest biometric privacy law in the country, and each of Chicago's biggest sectors answers to its own regulator. We settle consent flows, encryption, audit logs and retention rules with your counsel before the first screen is designed, so nothing has to be rebuilt after legal review.
A mobile app development company in Chicago is judged on what happens after launch: does the app pass the audit, plug into the systems that run the business, and move the number it was built for? Five reasons clients stay with us past the first release.
Consent, retention, encryption and access rules are agreed in discovery, with your counsel in the room. The app is audit-ready on launch day instead of needing a rebuild after the first legal review.
Integration is where most Chicago app projects stall. Our team has connected mobile products to Odoo, SAP, Salesforce, clinical record systems and custom ledgers, so the app becomes part of how the business runs rather than a silo beside it.
Discovery ends with a scope document and a fixed price. You get a named senior engineer as your point of contact, sprint demos in Central Time and no open-ended billing. Custom software development in Chicago should not come with an open tab.
We test on mid-range Android phones, throttled connections and offline mode, because a field app has to work in a South Side warehouse and on a Blue Line train between stations, not just on office Wi-Fi.
Every project starts with the number it exists to move: bookings, claims closed, calls deflected, orders per hour. We report against it after launch, and we say plainly when a requested feature will not move it.
Recommendation engines, in-app assistants and predictive alerts, scoped to a business outcome and shipped inside the product you already have. Chicago teams use us for:
Most enterprise app projects do not fail on features. They stall on the systems around them, the compliance review, the first real traffic spike and the second session nobody comes back for. Here is how we handle each.
Many Chicago organizations still run on ERPs, CRMs and warehouse systems that predate the app store. Bolting a mobile front end onto them is slow, fragile and expensive to keep alive.
We build a secure integration layer of APIs, middleware and event streams between the app and the systems you already trust, so field staff stop keying the same data twice and IT keeps the platforms it knows.
IntegrationBIPA consent, HIPAA safeguards, PCI DSS scope and SOC 2 controls can add months when legal sees the app for the first time at launch.
Compliance is agreed with your counsel during discovery, then built in as encryption, consent flows and audit logs, so healthcare, fintech and retail apps are launch-ready without a late rebuild.
ComplianceThe prototype that impressed investors starts failing under real traffic: slow syncs, crashes at peak hours and a cloud bill nobody planned for.
We architect for growth from the first sprint with stateless services, queues, caching and autoscaling, then load-test before launch instead of patching after it.
ScaleMost apps lose the majority of their users inside a month, because the second session offers nothing the first one did not.
Onboarding, notifications and personalization are designed around a retention metric, instrumented with analytics, and iterated on the data after launch rather than on opinion.
RetentionWe add these where they change an outcome for the user or the business, and leave them out where they would only add cost. Each one links to the Appther practice that delivers it.
AI adds intelligence to everyday workflows. In the enterprise apps we build it powers automation, personalization and faster decisions, so the app adapts to both the user and the business goal.
We embed generative AI where content or answers are needed at scale: in-app assistants, report drafting and recommendations grounded in your own data rather than the open internet.
We integrate IoT into mobile apps to connect devices, sensors and back-end systems, helping Chicago operators monitor equipment, track assets and cut manual work in real time.
Our apps turn raw events into something actionable. Built-in analytics let Illinois businesses see patterns, measure performance and act quickly instead of waiting on a monthly export.
Voice agents that answer calls, book appointments and resolve routine requests around the clock, integrated with the same backend as the app so nothing is re-keyed.
Tamper-proof records, tokenized assets and wallet integrations for products where provenance, settlement or ownership has to be provable rather than promised.
Boring on purpose. Every tool below has survived an enterprise security review, has a hiring market in Chicago, and will still be maintained when your app is five years old.
Swift
SwiftUI & UIKit
Xcode
iOS SDK
Kotlin
Jetpack Compose
Android Studio
Android SDK
Flutter
Dart
React Native
Expo
Ionic
Node.js
NestJS
Python
Django
FastAPI
Laravel
Go
PostgreSQL
MongoDB
MySQL
Redis
Firestore
SQLite
Supabase
AWS
Microsoft Azure
Google Cloud
Docker
Kubernetes
Terraform
Auth0
Okta
Keycloak
Firebase Auth
Face ID & Biometrics
OAuth 2.0 / OIDC
Firebase Cloud Messaging
Apple Push Notification service
OneSignal
Twilio SMS & WhatsApp
Stripe
Braintree
PayPal
Square
Apple Pay
Google Pay
Plaid & ACH
Google Analytics 4
Mixpanel
Sentry
Datadog
Grafana
Crashlytics
GitHub Actions
GitLab CI
Fastlane
Bitrise
Jenkins
TestFlight
Send us the idea and we will return a scoped estimate with the platform, team and timeline behind the number, usually within one business day.
Get a Scoped EstimateSix stages, each ending in something you can open, click or sign. Transparent enough for a procurement team, fast enough for a founder.
Every project starts by defining the real business need and the metric it must move. For custom software development in Chicago that often means reconciling BIPA and HIPAA obligations with a launch date, and deciding what the app must solve today versus what will keep it relevant in three years.
We map the timeline, team, tools and integration points, then fix the scope and price in writing. Like the city's rail network, the plan is built for heavy load and constant change, and you see every milestone before the first sprint starts.
Our app developers in Chicago design for the people who actually use the product: a nurse on a night shift, a driver at a loading dock, a trader between calls. Wireframes, clickable prototypes and a design system come first, tested with real users before a line of production code is written.
Native Swift and Kotlin, or Flutter and React Native when one codebase makes sense, built in two-week sprints with a demo at the end of each. Backend, APIs and integrations are developed in parallel so nothing waits on anything else.
Automated and manual QA on real devices, throttled networks and offline mode, plus security testing against OWASP MASVS and accessibility checks against WCAG 2.2. Nothing ships with an open critical.
We handle App Store and Google Play submission, release monitoring and the first weeks of hypercare, then move to an SLA-backed support plan with crash, performance and retention dashboards you can read without us.
Mobile app development cost in Chicago depends on what you are building: the scope, the platform (iOS, Android or cross-platform), how complex the design is, what kind of backend and integrations you need, and any advanced features such as AI, payments or biometrics.
Need real numbers? Reach out to our experts for a fixed-price quote based on your Chicago app vision. There is no open-ended billing after discovery.
An MVP with a focused feature set usually takes 8 to 14 weeks from kickoff to store submission. A mid-scale product with a custom backend and third-party integrations lands in 3 to 6 months. Enterprise platforms with compliance reviews, several user roles and legacy integrations run 6 months or more. Work is delivered in two-week sprints with a demo at the end of each, so you see progress every fortnight rather than at the end.
Yes. We build with Flutter and React Native when one codebase for iOS and Android makes sense, which is most consumer apps, marketplaces and internal tools. We recommend native Swift or Kotlin when the product leans on hardware, heavy graphics, background processing or platform-specific features. We will tell you which fits during the free discovery call rather than defaulting to whatever we prefer.
Six stages: requirement analysis, planning, design, development, testing, and launch with ongoing support. Discovery ends with a written scope and a fixed price. Design is validated with real users before development starts, engineering runs in two-week sprints with demos, QA covers real devices and security testing, and after launch we move to an SLA-backed support plan with the dashboards to prove the app is doing its job.
Compliance is decided in discovery, with your counsel, before design begins. For the Illinois Biometric Information Privacy Act that means written consent, a published retention schedule and no biometric data leaving your tenancy. For HIPAA it means encrypted storage, role-based access, audit logging and a signed business associate agreement where one is needed. For payments we keep card data out of your systems with tokenized checkout. Every control is documented so your auditor can trace it.
Appther is remote-first. Our US entity is registered in California and our US-facing team works Central Time hours for Chicago clients, so stand-ups, demos and escalations happen inside your working day. Delivery runs as a distributed team with a named senior engineer as your single point of contact rather than a rotating support queue.
You do. Repositories live in your organization, the App Store and Google Play accounts are in your name, and cloud infrastructure runs in your tenancy. We sign an NDA before discovery and assign all intellectual property on payment. If you ever move on, offboarding is a permissions change rather than a migration.
The first weeks are hypercare: we watch crash rates, performance and reviews daily and fix issues as they appear. After that you choose a support plan with a defined SLA, OS-update coverage, security patching and a monthly report on retention and performance. Many Chicago clients keep the same team on a retainer to ship the next release, which is faster than onboarding a new one.
Pricing breakdowns and vendor-selection advice we send Chicago clients before the first call, so the conversation starts from real numbers.
Tell us what the app has to do and who it is for. No sales pitch, just a straight answer on approach, scope, timeline and cost. Prefer email? Use our contact page.
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