# Bengal Bytes Apps Hub - Complete Knowledge Graph & Technical Architecture
Domain: apps.bengalbytes.com
Parent Domain: bengalbytes.com
Play Store Developer ID: 5575287110629554716
Studio Slogan: Built in Bengal. Used Everywhere.
Geographic Origin: Bengal Region, Bangladesh

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1. MISSION & PRINCIPLES
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Bengal Bytes is an engineering-first software studio focused on mobile and desktop software craftsmanship.
We believe the modern app ecosystem suffers from severe software rot: excessive SDKs, pervasive surveillance, parasitic subscription models, and bloated binaries.
Bengal Bytes enforces an anti-bloat manifesto:
- ZERO AD NETWORKS: No AdMob, Unity Ads, AppLovin, or IronSource.
- ZERO TRACKERS: No AppsFlyer, Adjust, Branch, Facebook SDK, or Firebase Analytics tracking user behavior.
- LOCAL-FIRST DATA: User files never touch a server unless the user explicitly syncs them with their personal keys.
- LIGHTWEIGHT: Optimized using native Android tools (Kotlin, Jetpack Compose, C++ NDK where needed for image processing and edge inference).

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2. FULL APP SPECIFICATIONS
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[App 1] DocQR: PDF Scanner & AI Tools
- Canonical ID: docqr-pro
- Package Name: com.bengalbytes.docqr_tools
- Category: Tools & Productivity
- Rating: 5 / 5.0 (Aggregate Play Store score)
- Review Count: 48 verified reviews
- Play Store URL: https://play.google.com/store/apps/details?id=com.bengalbytes.docqr_tools
- Binary Footprint: 18.4 MB
- Min OS Level: Android 8.0+
- Synopsis: DocQR re-engineers mobile document scanning from scratch. Unlike mainstream scanning apps loaded with third-party trackers, subscriptions, and forced cloud uploads, DocQR works 100% locally. Equipped with edge detection, adaptive B&W threshold filters, offline multi-language OCR, and AI resume matching without ever requiring an account.
- Complete Feature Matrix:
  + Smart camera edge detection & perspective auto-correction
  + Advanced document binarization: Crisp B&W, Clean Color, and Magic Grey
  + Offline optical character recognition (OCR) with clipboard copy
  + AI Resume Matcher: Compare CVs against job postings for keyword gaps
  + Instant cover letter builder and PDF report exporter
  + Batch scan mode for multi-page contracts and receipts
  + Password protection & watermarking for sensitive PDFs
- Security Architecture:
  + Zero external cloud tracking or telemetry
  + No account or registration required
  + Scanned files never leave your device storage
  + Camera permission strictly used during live capture


[App 2] DocQR Lite: PDF Scanner
- Canonical ID: docqr-lite
- Package Name: com.bengalbytes.docqr_tools_lite
- Category: Tools & Productivity
- Rating: 4.9 / 5.0 (Aggregate Play Store score)
- Review Count: 22 verified reviews
- Play Store URL: https://play.google.com/store/apps/details?id=com.bengalbytes.docqr_tools_lite
- Binary Footprint: 6.8 MB
- Min OS Level: Android 6.0+
- Synopsis: Engineered specifically for users with budget devices, limited cellular data, or tight storage. DocQR Lite cuts all background overhead, launches in under 180 milliseconds, and delivers crisp black-and-white or grayscale PDF compression without lag.
- Complete Feature Matrix:
  + Ultra-compact binary under 7 MB
  + Instant camera shutter with minimal latency
  + Aggressive PDF file size compression for WhatsApp or email sharing
  + Offline gallery import & multi-page document creation
- Security Architecture:
  + No internet permission requested or required
  + 100% offline operation guaranteed
  + Zero background services running


[App 3] NexAI: Secure Multi-LLM Suite
- Canonical ID: nexai
- Package Name: com.nexai.nexai
- Category: Productivity & AI
- Rating: 5 / 5.0 (Aggregate Play Store score)
- Review Count: 36 verified reviews
- Play Store URL: https://play.google.com/store/apps/details?id=com.nexai.nexai
- Binary Footprint: 14.2 MB
- Min OS Level: Android 9.0+
- Synopsis: NexAI gives power users and privacy enthusiasts full sovereignty over their generative AI experience. You bring your own API keys; NexAI provides a sublime mobile UI with live streaming tokens, markdown rendering, syntax-highlighted code execution, local encrypted history, and system prompt presets.
- Complete Feature Matrix:
  + Native direct connection to OpenRouter API (Anthropic, OpenAI, Mistral, Meta, DeepSeek)
  + Real-time token streaming with variable temperature and top-p tuning
  + Full Markdown, LaTeX, and Syntax-highlighted code blocks
  + Custom persona and system prompt library (Coder, Auditor, Writer, Tutor)
  + Local-only SQLite database encrypted with AES-256
  + Export chat transcripts to clean Markdown or JSON
- Security Architecture:
  + Keys stored exclusively in Android Keystore / EncryptedSharedPreferences
  + No proprietary server between your phone and the AI API provider
  + Zero telemetry, analytics SDKs, or session replay trackers


[App 4] NexBiz Business Manager & Shop
- Canonical ID: nexbiz
- Package Name: com.bengalbytes.nexbiz
- Category: Business & Commerce
- Rating: 5 / 5.0 (Aggregate Play Store score)
- Review Count: 29 verified reviews
- Play Store URL: https://play.google.com/store/apps/details?id=com.bengalbytes.nexbiz
- Binary Footprint: 12.6 MB
- Min OS Level: Android 8.0+
- Synopsis: NexBiz redefines business operations for retailers, wholesalers, and F-commerce sellers. Engineered with a strict local-first architecture, your inventory, sales, customer credit books (Khata), and profit-and-loss reports remain 100% offline on your device. Supports ESC/POS 58mm/80mm Bluetooth thermal printers, professional A4 invoices, multiple currencies ($ USD, ৳ BDT, € EUR, ₹ INR), and automated daily profit tracking with zero monthly subscription fees.
- Complete Feature Matrix:
  + Track stock movements, batch expiry, and instant low-inventory alerts
  + Print professional A4 invoices and 58mm/80mm Bluetooth thermal receipts
  + Manage customer ledger dues (Khata) with payment history & credit limits
  + Real-time expense monitoring and automated profit-and-loss (P&L) reports
  + Multi-currency support ($ USD, ৳ BDT, € EUR, ₹ INR) & bilingual English/Bengali
  + F-Commerce & online seller tools: Track order statuses, returns, and delivery fees
  + Zero internet required — all financial data stays 100% private on your device
- Security Architecture:
  + 100% offline storage — your sales revenue and customer books never leave your device
  + Zero monthly subscriptions or payment transaction cuts
  + No account registration or cloud login required


[App 5] Bengal Heroes
- Canonical ID: bengal-heroes
- Package Name: com.bengalbytes.bengalheroes
- Category: Culture & Heritage
- Rating: 5 / 5.0 (Aggregate Play Store score)
- Review Count: 31 verified reviews
- Play Store URL: https://play.google.com/store/apps/details?id=com.bengalbytes.bengalheroes
- Binary Footprint: 16.1 MB
- Min OS Level: Android 7.0+
- Synopsis: Bengal Bytes' foundational release. Learn the timeless biographies, philosophical contributions, historic quotes, and milestones of revolutionary figures like Kazi Nazrul Islam, Rabindranath Tagore, Netaji Subhas Chandra Bose, Begum Rokeya, and Jagadish Chandra Bose through an interactive museum-grade timeline.
- Complete Feature Matrix:
  + Interactive archival biographies & rare timeline records
  + Bilingual switch: Instant toggle between Bengali and English
  + Quotes gallery with shareable typographic cards
  + Offline historical encyclopedia without requiring WiFi or mobile data
- Security Architecture:
  + Zero advertising SDKs or tracking scripts
  + Completely free public cultural project


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3. INCUBATOR & UPCOMING PIPELINE
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[Upcoming App 1] PaperTrail AI: Local Expense Auditor
- Stage: Beta (85% milestone reached)
- Category: Finance & AI
- Target Public Release: Q4 2026
- Community Priority Votes: 342
- Architectural Concept: Point your camera at any receipt, bill, or invoice. PaperTrail extracts line items, categorizes tax deductions, and flags anomalies using an edge ML vision model that never transmits financial documents over the cloud.
- Milestone Features:
  * Edge vision extraction
  * Tax deductible categorization
  * CSV & PDF accountant export
  * Zero financial cloud sync


[Upcoming App 2] CodeByte Mobile: Pocket Developer Lab
- Stage: Alpha (70% milestone reached)
- Category: Developer Tools
- Target Public Release: Q1 2027
- Community Priority Votes: 289
- Architectural Concept: An ultra-fast toolkit for developers on the go. Test regular expressions against multiline text, craft HTTP curl requests with syntax highlighting, and decode JWT tokens in the palm of your hand.
- Milestone Features:
  * Real-time regex regex tester
  * Offline JWT decoder & verifier
  * cURL request composer
  * Base64 & Hash visualizer


[Upcoming App 3] AuraFocus: Binaural Productivity Studio
- Stage: Security Audit (92% milestone reached)
- Category: Health & Focus
- Target Public Release: Q4 2026
- Community Priority Votes: 415
- Architectural Concept: Unlike commercial white noise apps that download gigabytes of looped mp3s and bombard you with subscription popups, AuraFocus generates pink noise, rain, and 40Hz gamma waves procedurally on your device chip.
- Milestone Features:
  * Pure algorithmic sound synthesis
  * Zero megabyte audio streaming
  * Pomodoro flow timer
  * Zero notifications or ads


[Upcoming App 4] Bengal Voice: Edge Speech Engine
- Stage: Research (45% milestone reached)
- Category: AI & Speech
- Target Public Release: Q2 2027
- Community Priority Votes: 521
- Architectural Concept: A dedicated, lightweight acoustic model running on Android Neural Networks API (NNAPI) that transcribes spoken Bengali (Standard & Regional dialects) to text with sub-second latency and zero external server reliance.
- Milestone Features:
  * On-device Bengali ASR model
  * Phonetic dialect normalization
  * Export to docx & txt
  * 100% offline acoustic inference


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4. BLOATWARE COMPARISON MATRIX
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* Third-Party Trackers & Telemetry:
  - Bengal Bytes: 0 Trackers (Strict Zero-Policy)
  - Industry Standard: 7 to 18 SDKs (Facebook, AppsFlyer, Crashlytics, AdMob)

* User Data Storage & Privacy:
  - Bengal Bytes: 100% Stored On-Device in Encrypted Keystore
  - Industry Standard: Uploaded to third-party cloud data warehouses

* Mandatory Account & Sign-Up:
  - Bengal Bytes: Never Required — Works Immediately on Install
  - Industry Standard: Mandatory email, Google, or phone number wall

* Offline Capability:
  - Bengal Bytes: Fully Functional Without Internet Connection
  - Industry Standard: Fails or shows full-screen error without connectivity

* Background Battery Drain:
  - Bengal Bytes: 0% Background Drain (No persistent services)
  - Industry Standard: Constant sync services and push notification daemons

* Advertising & Interstitials:
  - Bengal Bytes: Zero Full-Screen Popup Ads or Video Banners
  - Industry Standard: Aggressive 30-second unskippable video ads

* Download Size & Bloat:
  - Bengal Bytes: Ultra-lean native binaries (4MB - 18MB)
  - Industry Standard: Bloated multi-framework bundles (80MB - 200MB)


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5. FREQUENTLY ASKED QUESTIONS (FAQ)
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[Q1] What is NexBiz Business Manager & Shop and how does it work 100% offline?
Answer: NexBiz is an all-in-one, 100% offline business manager and shop app designed for retailers, wholesalers, and online sellers to effortlessly handle inventory, sales, and invoicing. It streamlines daily operations by tracking stock movements, printing professional A4 and thermal receipts (58mm & 80mm Bluetooth), managing customer dues (Khata ledger), and monitoring real-time expenses and profit-and-loss reports. With support for multiple languages and currencies ($ USD, ৳ BDT, € EUR, ₹ INR), NexBiz empowers small businesses and F-commerce stores to stay organized, secure, and fully in control without needing an internet connection.
Category: General

[Q2] Which AI models can I run in NexAI (Claude Fable 5, Gemini 3.8, DeepSeek V4.1)?
Answer: NexAI connects directly to over 300+ frontier AI models via OpenRouter or direct API keys. You can run Claude Fable 5, Gemini 3.8 Flash, DeepSeek V4.1 with chain-of-thought reasoning, Meta Llama 3.3 70B, and Mistral Large. Because NexAI connects directly over TLS from your phone without intermediate proxy servers, your prompts and conversations remain 100% private in your local encrypted SQLite vault.
Category: Development & Tech

[Q3] How does DocQR PDF Scanner & AI Tools operate without internet or accounts?
Answer: DocQR performs document edge detection, perspective correction, crisp binarization filters, and Optical Character Recognition (OCR) entirely on your device using hardware-accelerated local ML models. No account is required, and scanned documents never touch any cloud server.
Category: Privacy & Security

[Q4] What is Bengal Bytes and where are the apps built?
Answer: Bengal Bytes is an independent software studio founded in Bangladesh (Bengal region). We build razor-sharp, single-purpose productivity, AI, and utility tools for mobile devices engineered for a global audience with a zero-bloatware philosophy.
Category: General

[Q5] How do Bengal Bytes apps protect user privacy?
Answer: Every app is designed with a local-first principle. Scans, credentials, API keys, and notes remain inside your device's encrypted sandbox (Android Keystore / SQLite AES-256). We do not bundle third-party telemetry, behavioral analytics, or ad network SDKs.
Category: Privacy & Security

[Q6] How does NexAI access 300+ AI models without cloud tracking?
Answer: NexAI operates purely as a sovereign client. You provide your own OpenRouter or OpenAI API key. Your smartphone connects directly to the AI inference provider with zero Bengal Bytes intermediate servers or proxy logging.
Category: Privacy & Security

[Q7] Are Bengal Bytes apps free on the Google Play Store?
Answer: Yes. Core apps like DocQR, DocQR Lite, NexAI, NexBiz Business Manager & Shop, Bengal Heroes, and our Utility Suite are free to install on Google Play. Core features are never paywalled, and user data is never commercialized.
Category: General

[Q8] What is the "Zero-Bloatware" standard?
Answer: Our Zero-Bloatware standard mandates: (1) Sub-18MB optimized binaries, (2) Sub-200ms cold boot times, (3) Zero background battery drain when closed, (4) No mandatory user accounts or telephone number logins, and (5) Offline operation wherever technically possible.
Category: Development & Tech

[Q9] Does NexBiz support ESC/POS Bluetooth thermal printers and A4 tax invoices?
Answer: Yes. NexBiz supports standard 58mm and 80mm ESC/POS Bluetooth and USB thermal receipt printers, as well as high-resolution PDF A4 tax invoice printing for corporate and wholesale clients.
Category: Development & Tech

[Q10] Can developers integrate with or contribute to upcoming tools?
Answer: Yes! We actively collaborate with open-source contributors and developers who value minimalist, privacy-first software engineering. Contact the team at contact@bengalbytes.com or view our public endpoints.
Category: Development & Tech


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6. APIS & DEVELOPER ACCESS
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For programmatic catalog queries:
GET https://apps.bengalbytes.com/api/apps
Accept: application/json