An invoice app, made in the UK for UK sole traders and small businesses.

VAT-aware. GDPR-compliant by design. £15.99 once, yours forever. No monthly subscription. No account needed. Built by a UK company (Vioscale Technologies Ltd, Companies House № 14751646) so the data protection story is properly British, not an afterthought.

i.Built for British small business

Whether you're a sole trader in Sheffield, a limited company director in Brighton, or a consultant working between client sites, your day involves more invoices and expenses than you'd ideally like to think about. Most UK invoice apps either copy American assumptions (no VAT, no CIS, no sole-trader nuance) or charge a £12-£30 monthly subscription for features you'll use perhaps twice.

VioBusiness is built differently. It's a UK product, by a UK company, designed for one-person businesses and small teams who want to send a professional invoice in seconds and never see a renewal email. Your invoices live on your phone. Your customer details are yours, not ours. Your VAT records survive every iPhone upgrade.

ii.Pricing for the United Kingdom

iii.What a UK invoice needs to include

HMRC sets out the minimum requirements for a valid VAT invoice (and reasonable practice for non-VAT invoices). VioBusiness produces invoices that meet these by default:

• A unique invoice number. Sequential and gap-free. VioBusiness handles this for you (INV-0001, INV-0002, ...). You can customise the prefix in Settings.
• Date of issue, and tax point if different. For most invoices these are the same; VioBusiness uses the issue date.
• Your business name, address, and (if applicable) VAT registration number. Set these once in your Business Profile and they appear on every invoice.
• Your customer's name and address.
• Description of goods or services supplied, quantity, and unit price.
• VAT rate and amount per line (or invoice total). Standard 20%, reduced 5%, zero-rated, or exempt - set per invoice.
• Total excluding VAT, VAT amount, and total including VAT. Calculated automatically.

iv.VAT, simply

If you're VAT-registered, set your registration number in the Business Profile and the standard 20% rate as your default. On each invoice, the VAT line itemises with the rate, the VAT amount, and the gross total. Records are kept locally on your phone, and CSV-exportable for your accountant or for Making Tax Digital bridging software.

If you're not VAT-registered - typical for new sole traders below the £90,000 threshold - just leave the VAT rate at 0%. The invoice prints without a VAT line, with a clean total.

For special cases - reduced-rate items (5%), zero-rated supplies, exempt services, reverse charge - set the rate per invoice. For the full breakdown see our VAT on UK invoices guide (coming soon).

v.Sole traders, limited companies, and contractors

VioBusiness adapts to every legal structure. The Business Profile takes a single business name (which can be your personal name for sole traders, or the registered company name for Ltd companies). Add your VAT number if registered. The result on the invoice looks right whether you're an electrician trading as your own name, a consultancy under an Ltd, or a contractor invoicing through a personal services company.

If you're a Construction Industry Scheme (CIS) contractor or subcontractor, you can add a CIS deduction line to invoices as needed. The principal contractor deducts CIS at 20% (verified subcontractor) or 30% (unverified) from your labour element; the invoice should show this clearly. See our CIS invoice guide (coming soon).

vi.How it works, briefly

Invoices

Tap "New Invoice" → pick a customer (or create one inline) → add line items → set the VAT rate → tap Send. The PDF generates on your phone in seconds. Share via Mail, WhatsApp, AirDrop, or any UK-standard channel. Status tracking: Draft → Sent → Paid → Overdue.

Quotes & estimates

Build a quote, send it, and when the client signs off, convert it to an invoice with one tap. The VAT, line items, dates, and notes carry over - no re-entering the same job twice.

Expenses with receipts

Log each expense with amount, category, and date. Attach a receipt photo from your phone (HMRC requires evidence of business expenses for self-assessment). Filter by category to see where the month went. Export to CSV for your accountant or your MTD bridging software.

Recurring invoices

Set a monthly retainer once, and VioBusiness issues the next invoice automatically when it's due - even if the app isn't open. The free tier creates these as drafts so you stay in control.

Multi-currency

Bill in GBP, EUR, USD, or any of 20+ currencies. Each invoice carries its own currency. Useful for UK businesses with EU or US clients, where invoicing in their currency reduces FX questions.

vii.Privacy and GDPR

VioBusiness is built so that, for free and Pro-tier users, GDPR is largely a non-issue: we don't hold your data. Your invoices, customer details, expenses, and business profile all live in a local database on your phone. The app doesn't phone home, doesn't sync to any server, and doesn't include analytics or trackers.

If you opt into the Cloud tier (£2.49/month), an encrypted backup of your data is stored in our UK infrastructure under your account. Even there, the contents are encrypted and we cannot read your invoices. Full GDPR rights apply: access, export, and deletion are available in the app and on request.

We're a UK company - Vioscale Technologies Ltd, registered in England, Companies House number 14751646. Read the full privacy statement for specifics.

viii.Frequently asked questions

ix.Get the app

Available on the App Store and Google Play. Free to try; £15.99 once to unlock everything. No subscription, no signup, no commitment.

Outside the UK? See our pages for the United States, Canada, Australia, or India.