Own a production-ready scientific calculator product.
NexusCalc v3.1 is a complete, high-quality, ready-to-sell scientific computing platform — Desktop app (Windows · macOS · Linux) and a fully offline Mobile PWA in one package.
One package. Two platforms.
A fully native-feeling desktop application and a complete mobile Progressive Web App — both production-grade, both yours.
Desktop Application
Native-quality desktop app for Windows, macOS and Linux. Custom interface, smooth animations, full keyboard support and shortcuts.
- Pre-compiled .exe and .app included
- Dark & light themes
- Works fully offline
Mobile PWA
100% offline after first visit. Installable on iOS and Android. Full feature parity with the desktop version — Service Worker + PWA Manifest baked in.
- Add to Home Screen on any device
- Offline-first architecture
- No app store required
Built on a serious computation core.
Everything you need to ship a credible, professional-grade calculator product.
Advanced Expression Parser
Implicit multiplication (2(3+4)), variables, custom functions, and ans. Natural math input that just works.
SymPy + Secure AST
Symbolic math powered by SymPy with a hardened AST fallback — no eval, no pickle, no surprises.
37 Math & Stats Operations
From trig and logarithms to statistics and matrices — a complete computational toolkit.
Unit Converter · 17 Categories
Length, mass, time, energy, temperature, currency and more — professional-grade conversion.
Financial Calculator
Compound interest, loans, ROI, break-even, tip — built for real-world use cases.
History · Memory · Export
Full history, 10 memory slots, and exports to JSON, CSV, LaTeX and Excel.
What's inside the box.
Everything you need to ship under your own brand from day one.
- Complete source code — Desktop, Mobile and Core Engine
- Full Intellectual Property Rights — the code becomes 100% yours
- All assets, icons, screenshots and documentation
- Pre-compiled executables (.exe and .app)
- Commercial license — modify, rebrand and resell compiled products
- 89 comprehensive unit tests
- Plugin system for easy extensions
- Secure JSON-based session system (no pickle vulnerabilities)
- Detailed documentation and buyer's guide
Who this is for.
If you're serious about shipping a real product, NexusCalc gives you a head start measured in months.
Launch your own calculator
Rebrand, white-label and sell as your own product.
Foundation for a bigger product
Use as the math core for an education or science platform.
Portfolio expansion
Add a polished, premium product to your software portfolio.
Premium desktop + mobile tool
Offer high-value internal tooling to teams and clients.
Own it. Forever.
No subscriptions. No royalties. A single payment and the product is yours.
Open to slight negotiation
Full source code · Commercial license · Lifetime ownership
- Complete source code (Desktop + Mobile + Core)
- Full Intellectual Property & ownership
- Pre-compiled .exe and .app
- Commercial license to rebrand & resell compiled
- All assets, icons and documentation
- Lifetime ownership — no recurring fees
Serious buyers only · Chat-only communication · No calls / Zoom / meetings
Clear, simple, one-time.
Full transparency on what you can and can't do after purchase.
You can
- Modify and customize the code
- Rebrand and white-label the product
- Embed in other software you build
- Sell the compiled software under your brand
- Use commercially with no royalties
You cannot
- Reselling the raw source code as-is
- Claiming authorship of the original engine
Common questions.
Anything else? Reach out via chat after purchase.
Launch your own premium calculator product today.
NexusCalc v3.1 — engineered for excellence. Owned by you after purchase.