Quantum Quote
Professional Invoicing & UK Tax Compliance
Overview
Comprehensive business productivity platform for UK sole traders, contractors, and small businesses. Combines invoicing, expense tracking, mileage logging, CIS deductions, and full HMRC MTD compliance. Features Stripe payments, crypto QR codes, WhatsApp messaging, AI-powered receipt OCR, and a high-performance Zig PDF engine. Runs offline-first on desktop and mobile.
Features
- HMRC MTD Integration: OAuth 2.0 authentication, quarterly submissions, tax calculations, obligations tracking, and fraud prevention headers for Making Tax Digital compliance.
- CIS (Construction Industry Scheme): Deduction tracking, tax year summaries, contractor management with UTR numbers, statement reconciliation, and gross/net calculations.
- Payment Processing: Stripe payment links and invoices, QR codes for bank transfers (UK Faster Payments), and crypto payments (BTC, ETH, SOL, ADA, XRP, TRX, LTC, DOGE, MATIC, BNB).
- Expense & Mileage: Receipt scanning with AI OCR, HMRC mileage rates (45p/25p), route caching with Google Maps, and tax year allowance tracking.
- Communication: SMTP email integration, WhatsApp Business for invoices and payment reminders, GDPR-compliant opt-in/out, and customizable message templates.
- Advanced Features: Recurring invoices, credit notes, partial payments, multi-company support, job timer, material tracking, project management, and Joplin sync.
Key Metrics
HMRC MTD + CIS Compliant
Built With
Tauri 2.0 + Svelte 5 + Rust + Zig
Payments
Stripe, Bank QR, 10 Cryptocurrencies
Tax Features
MTD, CIS, VAT, Mileage (45p/25p)
Communication
Email (SMTP) + WhatsApp Business
Platforms
Windows, macOS, Linux, Android, iOS