Simple, Privacy-First Software & Resilient Digital Tools.
We build zero-knowledge cryptographic vaults, offline peer-to-peer protocols, civic transit utilities, and quantitative predictive engines — designed for user sovereignty with zero telemetry.
Interactive Web Tools & Products
Client-side web utilities, predictive analytics, encrypted vaults, and offline media tools. Free, open-source, and private.
Built-in Web Utilities & Analytics
6 ToolsKalyan Auto-Predictor
In-browser machine learning engine polling live draw results every 45s. Recalibrates Markov transitions, gap hazards, and 4-Ank dual OTC signals.
UPI Link & QR Generator
Generate instant one-click UPI payment links and high-res QR codes for Indian payments. Payers open links with one tap in GPay, PhonePe, or Paytm.
Spotify RetroWave Player
Offline RetroWave HTML5 audio player with animated synthwave Canvas visualizer, drag-and-drop playlist support, and Spotify batch download console extractor.
v_yt Media Downloader
Lightweight, ad-free YouTube video and audio fetcher powered by yt-dlp via Cobalt API edge workers. Download MP4 (720p/1080p) or extract MP3 audio.
Video Downloaders Guide
Curated technical comparison covering legitimate, privacy-first, and open-source video downloaders and media transcoding utilities (yt-dlp, Cobalt, NewPipe, VLC, FFmpeg).
Historical Penal Chart
Complete high-density visualizer indexing 14+ years and 3,200+ historical Kalyan results with color-coded panel brackets and fast search querying.
Flagship Open-Source Software
3 ProductsZevSafe
Zero-trust browser folder vault. Encrypts nested folder hierarchies client-side via AES-256-GCM and PBKDF2-SHA512 (600,000 rounds). Files never touch a network.
CollegeBus
Real-time student transit scheduler and multi-hop route planner for ACMSR College (Borda) and South Goa routes. Instant offline timetable caching.
ZevSync
Decentralized peer-to-peer data sync protocol over BLE and Wi-Fi Direct. Content-addressable storage (CAS), vector clocks, and CRDTs without central infrastructure.
Looking for the developer directory?
Browse our full catalog index with technical docs, command line utilities, and project files.
Privacy & Engineering Manifesto
We engineer software on foundational principles of sovereignty, local resilience, and zero data leakage.
Zero-Knowledge Core
Data never leaves your browser unencrypted. Keys are dynamically derived in client runtime.
Offline-First Design
Fully functional without an internet connection. Standalone PWAs, local caches, and Bluetooth mesh.
Zero Surveillance
No telemetry, no tracking pixels, no behavioral analytics. Clean and strictly private.
Auditable & Open
Standard cryptographic primitives and MIT open-source codebases you can inspect yourself.
Cryptographic & Protocol Matrix
| Subsystem | Protocol / Primitive | Guarantee |
|---|---|---|
| ZevSafe Vault | AES-256-GCM + PBKDF2-SHA512 | Zero-Trust Client Cryptography |
| Kalyan Predictor | Markov Matrix + Gap Hazard | +15.4% Model Edge (Top 5) |
| UPI Generator | Deep-link URI + QR Matrix | 100% Client-Side Privacy |
| ZevSync Mesh | Vector Clocks & CRDTs | Decentralized P2P Sync |
| CollegeBus PWA | Service Worker Cache-First | 100% Offline Access |
Interactive WebCrypto Hash Derivation
Verify our client-side cryptographic principles in real-time. Type any message below; your browser derives a 512-bit SHA-512 digest locally using the hardware-accelerated window.crypto.subtle API.
Building Software That Works for You — Not Against You.
Zevbuild is an independent software studio founded in Goa, India. We build tools that are encrypted by default, functional without internet, free from surveillance, and auditable by anyone.
$ zevbuild --info
Studio: Zevbuild · HQ: Goa, India 🇮🇳
──────────────────────────────────────
✔ [ZevSafe] v3 Stable · AES-256-GCM Vault
✔ [CollegeBus] Civic PWA · Transit Scheduler
✔ [Kalyan ML] v2.4 Auto · Markov Model & PWA
✔ [UPI Gen] Instant QR & Link Generator
✔ [Spotify Player] RetroWave Player & Audio Visualizer
✔ [ZevSync] CAS Mesh · Peer Node
──────────────────────────────────────
$ echo "Privacy by design. Sovereignty by default."
Connect with Zevbuild
Collaborate on open-source privacy software, suggest features, or inquire about custom zero-knowledge development.