Assemblysoft Product Case Study

SendInvoice — Professional
Invoice Generator SaaS

Built by Assemblysoft, SendInvoice is a cloud-native SaaS platform enabling freelancers and businesses worldwide to create, send, and manage professional invoices in seconds — with 150+ currencies, 7 languages, and one-click payment links.

SendInvoice Logo
150+
Currencies
7
Languages
11
Document Types
100+
Invoice Templates
About The Product

What Is SendInvoice?

SendInvoice is a professional invoice generator built by Assemblysoft, designed for freelancers, trades, and small businesses who need to look professional and get paid faster.

The platform is entirely browser-based — no downloads, no installs. Built on .NET Blazor and deployed on Microsoft Azure, it offers enterprise-grade reliability with a simple, intuitive user experience.

From a standard invoice to a VAT tax invoice, credit note, or purchase order — SendInvoice handles 11 different business document types, all with beautiful, designer-quality templates and integrated payment links.

Your Company
Custom Logo & Branding
#INV-1001
Web Design Services £850.00
Monthly Retainer £400.00
Total £1,250.00
Payment link included — paid instantly
✨ Professional & Polished
Platform Features

Everything You Need to Get Paid

Clear, practical tools designed for busy professionals

100+ Professional Templates

Beautifully designed invoice templates created by professional graphic designers. Customise with your logo, brand colours, and company details to stand out from the competition.

Integrated Payment Links

Accept card payments, PayPal, Stripe, and bank transfers directly from the invoice. Clients can pay in seconds — funds settle to your account within 1–2 business days.

Multi-Language Support

Send invoices in English, Spanish, French, German, Portuguese, Dutch, and Polish. Switch languages per invoice with automatic content updates — perfect for international clients.

150+ Currencies

Invoice clients in their local currency with automatic symbol and decimal formatting. Supports GBP, USD, EUR, JPY, and 150+ additional currencies worldwide.

VAT & Tax Handling

Automatically calculate VAT rates, tax IDs, and line-item totals. Supports complex tax structures for different countries and business types — no manual maths required.

Quote → Invoice Conversion

Convert accepted quotes to invoices in one click — no retyping, no copy-pasting. Streamline your entire workflow from initial estimate through to final payment.

PDF Export & Email Delivery

Download professional PDF invoices or email them directly to clients. Print hard copies or go fully digital — track opens and payment status from your dashboard.

Cloud Storage & Auto Backup

All invoices are securely stored in the cloud with automatic backups. Access them from any device, anywhere, anytime — even if your computer crashes, your data is safe.

Browser-Based — No Install

Works on any device in any modern browser. No app downloads, no updates to manage. Fully responsive on desktop, tablet, and mobile — just open a browser and start invoicing.

Document Types

11 Business Document Types

From invoices to purchase orders — every document your business needs in one platform

Invoice

Sales billing

Quote

Price estimate

Receipt

Payment proof

Credit Note

Refunds

Purchase Order

Procurement

Delivery Note

Shipping

Proforma Invoice

Pre-invoice

Estimate

Cost proposal

Sales Receipt

Cash sale

Credit Memo

US credits

Tax Invoice

VAT invoice

Get Paid Instantly

Multiple Payment Methods

Cash-only businesses are a thing of the past. SendInvoice embeds payment links directly in every invoice, so clients can pay in seconds — via the method that works best for them. Many users report getting paid 30% faster after switching.

Credit & Debit Cards

Visa, Mastercard & more

PayPal

Fast, trusted payments

Stripe

Secure card processing

Bank Transfer

Traditional wire payment

Payment Status Paid
£1,250.00
Received 2 minutes ago
Visa •••• 4242
Online payment
⚡ Fast Settlement
Funds arrive in your account within 1–2 business days
Enterprise-Grade Security

Protect Your Data. Enhance Your Security.

Cloud-native infrastructure with automatic backups and encryption at rest

Cloud-Based Storage

All customer data, documents, and reports are securely saved on a cloud-based platform. Access them from anywhere with an internet connection — no hardware dependency.

Automatic Backups

If your device crashes, your data is safe. Automatic cloud backups ensure you always have access to every invoice and record you need to keep your business running.

Easy Export & Reports

Export invoices as professional PDFs or Excel reports. Track revenue, unpaid invoices, and customer metrics — without manually reviewing records one by one.

Simple Process

How It Works

Three steps from sign-up to getting paid

1

Create an Invoice

Choose from 100+ professionally designed templates. Add your logo, brand colours, and company details. Customise every line item, add taxes or discounts — done in under 3 minutes.

2

Send It Out

Email as a PDF, share a secure payment link, or print a hard copy. Choose the delivery method that suits you and your client. Track opens and views from your dashboard.

3

Get Paid Faster

Clients pay via card, PayPal, Stripe, or bank transfer. Payment status updates instantly — no chasing, no confusion. All records safely stored for your accounts.

Global First

Built for a Global Audience

SendInvoice was designed from day one to serve businesses across borders. With 7 supported languages and 150+ currencies, you can send professional invoices to clients anywhere in the world — each invoice automatically adapting to the correct language, currency symbol, and decimal formatting.

Supported Languages
UK English
Spain Español
France Français
Germany Deutsch
Portugal Português
Netherlands Nederlands
Poland Polski
150+
Currencies Supported
GBP £
USD $
EUR €
JPY ¥
AUD A$
CAD C$
CHF Fr
INR ₹
...and 140+ more currencies worldwide
Technology

Built on Modern .NET & Azure

Leveraging Assemblysoft's deep expertise in cloud-native .NET development

.NET Blazor
Microsoft Azure
ASP.NET Core
Azure SQL
Azure AD B2C
PDF Generation
Azure Communication Services
Stripe API
Responsive Design
Clean Architecture

Try SendInvoice Today

Create professional invoices in seconds. Free preview available — no credit card required to start. Built by Assemblysoft and trusted by freelancers & businesses worldwide.

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A product built by Assemblysoft Ltd — your trusted custom software development partner. ← Back to Case Studies

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FAQs

Assemblysoft are Your Safe Pair of Hands

Azure

Azure DevOps

Blazor