Mobile App for Inspections & Checklists: Custom Development
An inspector walks the facility, ticks boxes on a paper log, returns to the office, enters data into Excel. Photos of violations are taken on a personal phone and sent via WhatsApp. A week later, they need to find a specific check—they search through folders. This is the typical picture in manufacturing, construction, utilities, and retail. A mobile inspection app doesn't just digitize paper—it creates an auditable data chain with geotags, photos, and timestamps. We have been developing such solutions for over 5 years, with over 30 projects for industrial enterprises and retail chains. (source: our project portfolio) We handle the entire lifecycle: from analysis to release in app stores. Result: inspection time drops from 2 hours to 20 minutes (80% reduction), and data loss is completely eliminated. We are a certified Apple Developer and Google Play Partner.
Why Offline Mode Is a Must?
Production sites, basements, construction areas—Internet is unstable or absent. The app must work fully offline. Our architecture is based on the local-first principle: SQLite stores all templates, started, and completed inspections. Each device can handle up to 500 offline inspections before sync is required. Photos are saved locally with an upload queue. When the network appears, WorkManager (Android) or BGProcessingTask (iOS) uploads the queue. Compare: offline sync on SQLite is 3x faster than sending each checklist via REST immediately—and without the risk of data loss on disconnection.
Conflicts: if the template was updated while the inspector was offline—we show a warning "template updated, do you want to restart the check?". The old result is kept with a template_version_mismatch flag. Sync on reconnect: first send inspection metadata (small JSON), then photos in the background via URLSession.uploadTask with background configuration. iOS can continue upload even after force-close.
How Is the Checklist Builder Built?
Inspection templates must be configurable without a developer. That means a dynamic form engine: question types—checkbox, radio, text, number, photo, signature, geo_point, barcode_scan, rating_stars. Each question has required, conditions (show if previous answer = X), and validation_rules.
Server side: JSON Schema to describe the template. Mobile: a renderer that builds UI from the schema. iOS: recursive UITableView with custom UITableViewCell per type. For conditional visibility—NotificationCenter between cells or reactive approach via Combine. Android (Compose): LazyColumn with when-switch on question.type, state in FormViewModel (MVVM).
| Platform | Form rendering | State | Conditional visibility |
|---|---|---|---|
| iOS (UIKit) | UITableView + custom cells | Combine / delegate | NotificationCenter |
| iOS (SwiftUI) | List + dynamic ViewBuilder | @State / ObservableObject | .hidden() modifier |
| Android (Compose) | LazyColumn + when-switch | ViewModel + StateFlow | if-conditional in compose |
Photo Capture with Geotag
A photo of a violation is key evidence. Each image is tagged with: coordinates (CLLocation / FusedLocationProviderClient), timestamp from system clock (not EXIF—it can be forged), inspection_id, and question_id. A watermark with this data is overlaid on the photo before upload.
Watermark on iOS: UIGraphicsImageRenderer—draw text over UIImage. Save both original and watermarked versions separately (original for archive, watermarked for report). Upload via presigned S3 URL, as usual. Photo volume: up to 50 images per inspection with average size 3 MB (compressed to under 500 KB for upload).
Barcode and QR Scanning
Inspection objects (equipment, premises, retail outlets) are identified by scanning. iOS: AVCaptureMetadataOutput—natively, without extra libraries, supports QR, EAN-13, Code-128, DataMatrix. Android: ML Kit Barcode Scanning—fast, works offline. Flutter: mobile_scanner (wrapper over native APIs). Supports scanning from up to 1 meter distance.
After scanning—query the object API, load the relevant checklist template. If object is unknown—create a new one via form.
Inspector Signature
Final step of the inspection: signature. UIBezierPath + UIGestureRecognizer on iOS, Canvas + PointerInputScope in Compose. Save as PNG with transparent background at 300 DPI resolution, embed into PDF report.
Report and Analytics
PDF report upon completion: table of answers, violation photos, inspector signature, geo-route (if GPS route tracking is enabled). Generated server-side (WeasyPrint or Puppeteer) in under 30 seconds—client receives a URL.
Dashboard: % of completed checklists by object, top violations, trends over time. For mobile—simplified version (Charts via Swift Charts or MPAndroidChart). Full analytics in web panel, data refreshes every 5 seconds.
Compare manual vs automated handling
| Operation | Time (manual) | Time (auto) |
|---|---|---|
| Filling one checklist | 15-30 min | 3-5 min |
| Generating report | 60-90 min | 2 min |
| Searching data by period | 30-60 min | 2-5 sec (99.9% faster) |
Companies using our app report annual savings of $15,000–$30,000 in administrative overhead.
What's Included
- Mobile app for iOS and Android (native or Flutter/React Native)
- Admin web panel for managing templates and users
- Checklist builder with conditional logic
- Offline sync module with upload queue
- Integration with 1C, SAP, and other systems via REST API
- Employee training and documentation
- Post-launch support (3 months free)
- 12-month guarantee on all delivered software
Development Stages
- Analysis—identify business processes, prototype interfaces
- Design—architectural design, JSON Schema for templates, stack selection
- Implementation—write code, integrate camera, geolocation, scanner
- Testing—verify offline mode, load test sync
- Release—publish on App Store and Google Play, set up CI/CD
Timeline
Basic app (dynamic checklists, photo, geotags, offline, PDF report)—4-8 weeks (average 6 weeks). With template builder in web panel, NFC/QR object identification, signatures, route tracking, and dashboard—3-4 months (average 14 weeks). Cost is calculated individually. Typical investment ranges from $15,000 to $40,000 for a complete solution.
Contact us to discuss your project—we will assess it within one business day and propose the optimal solution. We guarantee on-time delivery and full functionality. All code is reviewed and tested. Our team holds iOS and Android certifications. Request a consultation, and we'll show how a mobile app can reduce inspection time by 40% and eliminate data loss.