# YJY Studio

> Independent iOS developer (YJY Studio). We build privacy-first, offline-capable iPhone apps: AI Local Recorder (offline voice transcription & AI chat), Baby's First Cards (bilingual flashcards), KeepProof (local receipt & document vault), CogniBill (estimates & invoices, one-time purchase), and SceneBox (field inspection reports as EPUB 3 / PDF).

> Full detailed product guide (with pricing, features and FAQs): [llms-full.txt](https://yjy.info/llms-full.txt)

## Products

- [AI Local Recorder](https://yjy.info/en/products/ai-local-recorder/): Chat with your recordings. — AI-powered recording & transcription, 100% on-device. Record a meeting, lecture, or consultation — then ask your recording anything. Supports 8 languages. No cloud, no upload, your privacy stays yours.
- [Baby's First Cards](https://yjy.info/en/products/baby-first-cards/): Real animal & vehicle sounds! Custom background colors. Real photos – no cartoons. One-time purchase. Ad-free. — Does your toddler love animals AND vehicles? Baby's First Cards features real photos and authentic sounds to help your little one explore the world in two languages. Custom background colors, one-time purchase, ad-free.
- [KeepProof](https://yjy.info/en/products/keepproof/): Your local proof vault on iPhone. — KeepProof helps you scan, organize, and find receipts, warranties, IDs, contracts, and other life documents on your iPhone. Everything stays local by default, with Face ID protection, searchable OCR text, reminder dates, and export when you need it.
- [CogniBill](https://yjy.info/en/products/cognibill/): Generate estimates and invoices for your clients fast. — The simplest estimate and invoice app for solo contractors worldwide. Send professional estimates, invoices, and track payments from your phone. No subscription, buy once, use forever. Works offline, your data stays in your iCloud.
- [SceneBox](https://yjy.info/en/products/scenebox/): Capture the scene. Generate a report. — Capture on-site information with text, photos, video, audio, and location. Generate a fixed-layout EPUB 3 or PDF report with one tap. Runs entirely on-device - no account, no network required.

## Blog

- [Rental Move-In & Move-Out Inspection: A Checklist to Protect Your Deposit](https://yjy.info/en/blog/rental-move-in-out-inspection-checklist/) (2026-08-01): Most deposit disputes start with damage that was never documented. Do a systematic inspection at move-in and move-out, keep photo and video evidence, and turn it into a shareable PDF report.
- [Home Inspection Checklist: What to Check Before You Close](https://yjy.info/en/blog/home-buyer-inspection-checklist/) (2026-08-01): Buying a home is the biggest purchase you'll ever make, yet many problems are invisible at first glance. Check these 20 key points before you close — and turn your findings into a clear inspection report with SceneBox.
- [Used Car Inspection Checklist: What to Check Before You Buy](https://yjy.info/en/blog/used-car-inspection-checklist/) (2026-08-01): Used cars hide problems. Run this 15-point checklist yourself — paint, tires, seats, engine, test drive — photograph everything, and turn it into an annotated PDF inspection report with SceneBox.
- [Going Paperless: Digital Equipment Inspection with Your iPhone](https://yjy.info/en/blog/digital-equipment-inspection-paperless/) (2026-08-01): Paper checklists get lost, smudged, and can't be traced. Inspect item by item with your iPhone — photos, annotations, one-tap PDF reports, offline-ready, data stays on device. Turn inspection into evidence management.
- [Construction Site Reports — Build Better Documentation with SceneBox](https://yjy.info/en/blog/construction-site-report-generator/) (2026-07-24): No signal on site? No problem. Capture progress photos, annotate construction issues, record key procedures on video — all offline. Generate professional reports for clients and teams.
- [Insurance Claim Evidence Collection — Complete, Organized, Shareable](https://yjy.info/en/blog/insurance-claim-evidence-collection-app/) (2026-07-24): Never worry about insufficient claim evidence again. Collect photos, video, audio, and location in one place. Annotate key details. Generate a structured report ready for submission.
- [Property Handovers & Inspections Made Clear with SceneBox](https://yjy.info/en/blog/property-handover-inspection-app/) (2026-07-24): Document every detail of property handovers and inspections: annotate photos of scratches and damage, mark locations, timestamp video issues, and share a complete report in minutes.
- [Field Inspection Reports — From Site to Client in One App](https://yjy.info/en/blog/field-inspection-app-report-iphone/) (2026-07-24): A complete field inspection workflow on your iPhone: capture photos and video, add annotations to highlight issues, and generate structured EPUB or PDF reports ready to share.
- [How to Write an Estimate That Clients Actually Say Yes To](https://yjy.info/en/blog/how-to-write-estimate-clients-say-yes/) (2026-07-17): Sent an estimate and got silence? The problem might not be your price. 7 practical tips to write estimates that clients actually approve — and how CogniBill makes it faster.
- [10 Things to Look for in a Freelance Invoice App (2026 Guide)](https://yjy.info/en/blog/freelance-invoice-app-checklist/) (2026-07-17): Tired of subscription fees and cloud dependency? Here are 10 criteria every freelancer should use when choosing an invoice app. CogniBill checks all the boxes.
- [The 3-Minute Invoice: How Solo Contractors Can Bill Faster](https://yjy.info/en/blog/contractor-invoice-3-minute-workflow/) (2026-07-17): Manual invoicing takes 15-30 minutes per invoice — 60 hours per year. CogniBill cuts it to 3 minutes with AI-powered estimate creation and a simple 3-step workflow.
- [One Price, All the Invoicing You Need — CogniBill](https://yjy.info/en/blog/invoice-app-one-time-purchase-vs-subscription/) (2026-07-17): CogniBill is built for solo professionals who send invoices. One-time purchase of $14.99, no subscription. AI-powered, offline-first, your data stays yours.
- [How to Digitally Organize Your Home Documents on iPhone: A Complete Guide](https://yjy.info/en/blog/how-to-organize-home-documents-digital-iphone/) (2026-07-06): A 7-step system for going paperless at home: gather, scan, organize, set reminders, back up. Use KeepProof as your digital document vault — no cloud, no subscriptions.
- [Why an Offline Document Scanner Is Safer for Your Privacy (2026 Guide)](https://yjy.info/en/blog/offline-document-scanner-iphone-privacy-2026/) (2026-07-05): Cloud scanner apps upload your sensitive documents to remote servers. KeepProof processes 100% on-device — scan, OCR, and store everything on your iPhone. No account, no uploads.
- [Never Miss a Warranty Expiry Again: Organize Your Warranties with KeepProof](https://yjy.info/en/blog/warranty-tracker-app-iphone-organize-documents/) (2026-07-04): 35% of active warranties are forgotten. Scan warranty cards into KeepProof, set expiry reminders, and organize by category. Never lose a warranty claim again.
- [Best Receipt Organizer App for iPhone in 2026: Go Paperless, Stay Private](https://yjy.info/en/blog/best-receipt-organizer-app-iphone-offline-2026/) (2026-07-03): Paper receipts fade, get lost, and can't be searched. Digitize them on iPhone with KeepProof — local OCR auto-extracts details, 100% on-device storage keeps your data private.
- [Learn a Language — Make Your Own Vocabulary Cards](https://yjy.info/en/blog/baby-cards-language-learning/) (2026-05-22): Take a photo, record your voice, create a card. Use Baby's First Cards to build your own vocabulary deck for language learning.
- [How to Make Personalized Flash Cards with Your Own Photos](https://yjy.info/en/blog/personalized-flash-cards-own-photos/) (2026-05-19): Generic flash cards are everywhere. But your child's world is unique. Learn how to create personalized cards with your own photos and voice — in Baby's First Cards.
- [How to Use Offline Transcription to Ace Your Classes](https://yjy.info/en/blog/offline-transcription-ace-classes/) (2026-05-19): Too busy taking notes to actually listen? Try record + offline transcription + AI chat — a workflow that helps you truly understand your lectures.
- [Apple Unveils New Accessibility Features Powered by Apple Intelligence](https://yjy.info/en/blog/apple-accessibility-2026/) (2026-05-19): Apple previews accessibility updates with Apple Intelligence: detailed VoiceOver descriptions, on-device generated subtitles, Vision Pro wheelchair control, and more.
- [Ideas Strike Anywhere — Record with Apple Watch, Let AI Unpack It on iPhone](https://yjy.info/en/blog/apple-watch-recording-ideas-anywhere/) (2026-05-14): Great ideas don't wait for a convenient moment. Record on your Apple Watch with AI Local Recorder — it syncs to iPhone, transcribes offline, and lets you chat with your recording.
- [Baby's First Cards — Real Photo Flash Cards for Babies & Toddlers](https://yjy.info/en/blog/baby-first-cards-real-photo-flash-cards/) (2026-05-07): Real photo flash cards with bilingual Chinese & English, real human voice, and authentic animal sounds. Completely offline, no ads, one-time purchase. Help your baby discover the world through real pictures and real sounds.
- [Best Offline Voice Recorder for iPhone in 2026: Record, Transcribe & Chat with AI](https://yjy.info/en/blog/best-offline-voice-recorder-iphone-2026/) (2026-04-30): Looking for the best offline voice recorder for iPhone? We compare AI Local Recorder against Apple Voice Memos, Otter.ai, and Notta. Find out which app offers real AI transcription, chat with recordings, and complete privacy — all without internet.
- [Walked Out of the Doctor's Office and Already Forgot? Record, Then Ask](https://yjy.info/en/blog/doctor-visit-recording-medication-instructions/) (2026-04-28): Doctor visits are short and full of information. Here's how to record the conversation and ask questions about your visit — no need to replay the whole thing.
- [Recording Lectures on iPhone: A Student Guide to Offline Transcription](https://yjy.info/en/blog/college-lecture-recording-offline-transcription-tips/) (2026-04-26): Tired of scrambling to write down everything your professor says? Here's how to record lectures on iPhone and get instant transcripts — no WiFi needed.
- [How to Use AI Local Recorder for Meeting Notes (No Internet Needed)](https://yjy.info/en/blog/meeting-notes-offline-ai-transcription/) (2026-04-25): Stop worrying about missing key points in meetings. AI Local Recorder works 100% offline — record, transcribe, and search your meeting notes anytime, anywhere.
- [Online vs Offline AI Voice Recorders: A Privacy Comparison](https://yjy.info/en/blog/privacy-voice-recording-ai-comparison/) (2026-04-20): Not all AI voice recorders are created equal. We compare cloud-based vs local processing apps across privacy, speed, and reliability.

## FAQ

- **Are the apps really offline?** Yes. AI Local Recorder, KeepProof and SceneBox process everything 100% on-device. No account, no cloud upload, no data leaves your iPhone. CogniBill syncs through your own iCloud only.
- **Do the apps require a subscription?** No. All apps are one-time purchases with no subscription. CogniBill is $14.99 one-time (regularly $19.99), SceneBox has a free tier plus one-time Pro unlock.
- **Which languages are supported?** AI Local Recorder transcribes 8 languages: Chinese, English, Japanese, Korean, Spanish, German, French, Arabic. Baby's First Cards is bilingual (Chinese & English).
- **Who are these apps for?** Solo contractors and freelancers (CogniBill), field inspectors and property managers (SceneBox), students and professionals who record meetings/lectures (AI Local Recorder), parents of toddlers (Baby's First Cards), and anyone who wants to go paperless (KeepProof).

## Legal

- [Privacy Policy](https://yjy.info/en/privacy/)
- [Contact](https://yjy.info/en/contact/)