Full Feature Suite

Everything You Need to Get Paid on Time

A comprehensive toolkit engineered to streamline your entire billing, contract, and receipt workflow.

Lightning Invoice Engine

Build and customize professional client invoices with automated math, line-item quantity, tax/VAT calculations, discounts, and real-time live preview.

Auto Math Taxes & Discounts Live Preview

Dual & Multi-Currency Billing

Bill domestic and international clients seamlessly. Support for NGN, USD, GBP, EUR, CAD, and AUD with automated dual-currency conversion displays.

Multi-Currency Live FX Conversion

Deposit & Payment Receipts

Generate instant payment confirmation receipts for deposits and final balances. Link receipts directly to invoices to keep an audit trail of partial payments.

Deposit Receipts Balance Tracking

Contract & Agreement Builder

Generate legally sound service level agreements, retainers, and NDAs. Set project milestones, payment schedules, and include digital signatures for both parties.

Service Agreements Digital Signatures

Template Store & Custom Designer

Choose from curated designer templates or use the visual drag-and-drop template designer to craft a custom invoice look that reflects your brand identity.

Curated Store Visual Drag-and-Drop

Payment QR Codes & Banking Details

Embed direct bank account info, sort codes, SWIFT/IBAN, Crypto/USDT addresses, and auto-generated payment QR codes for fast mobile scanning.

Scan to Pay Crypto & Bank Details

Client Database & Item Presets

Save client addresses, tax numbers, and contact details for instant autofill. Store your services and products catalog for one-click invoice population.

1-Click Autofill Product Inventory

Cloud Sync & Google Drive Backup

Access your billing records across all your devices with real-time cloud sync. Export local .gmsbackup files or auto-sync directly to Google Drive.

Multi-Device Sync Google Drive

Live Revenue Dashboard & Metrics

Monitor your financial health with visual monthly billing summaries, collected payments, unpaid balances, and recent transaction history at a glance.

Revenue Trends Unpaid Alerts

Instant Preview & Privacy First

Explore the app, experiment with templates, and preview your invoices immediately in real time. Create a free account when you're ready to export crisp PDFs and sync records.

Instant Live Demo 100% Privacy

Simple Process

Three Steps to Getting Paid

No steep learning curves or complicated setup. Just open the app and get to work.

Enter Details & Pick Template

Add your client's name, line items, and payment terms. Choose between classic, modern, or project-focused layouts with custom branding.

Live Preview & Sign

Watch your document format in real time. Add your official company stamp, payment QR code, and digital signatures in seconds.

Export & Send

Generate a crisp, print-ready vector PDF in one click. Send it straight to your client via email or WhatsApp and track payments.

Transparent Pricing

Simple, Honest Subscription Plans

Affordable pricing for freelancers, creators, and growing businesses. No hidden fees.

Free Plan

For starters and occasional invoicing

₦0 forever

5 invoices & 5 contracts
Standard invoice & contract templates
Instant PDF export & direct printing
Deposit & full payment receipts
Client & product management

Get Started Free

Pro Monthly

For active creators and studios

₦1,000 /month

Unlimited invoices, receipts & contracts
Google Drive cloud sync & auto-backup
Custom business logos & signatures
Dual currency billing & FX conversion
All premium templates & custom designer
Priority email & chat support

Upgrade to Pro

Pro Yearly

Maximum savings for serious businesses

₦10,000 /year

Save 17% (2 Months Free)

Unlimited invoices, receipts & contracts
Google Drive cloud sync & auto-backup
Custom business logos & signatures
Dual currency billing & FX conversion
All premium templates & custom designer
Priority email & chat support

Get Pro Yearly

Behind the Scenes

The Story Behind GMS Invoice Manager

How a frustrating internal studio bottleneck transformed into a streamlined SaaS platform for creators.

“

Born inside Green Maison Studios

A creative studio's quest for simple, beautiful billing

Like many design studios, Green Maison Studios faced a tedious problem: every time a project wrapped up, our team had to manually open Adobe Illustrator to format invoices, align tables, and generate PDF bills. Available invoicing tools on the market were either cluttered with complicated ERP menus, riddled with ugly and dated templates, or locked behind overpriced subscriptions.

We decided to build our own internal tool—focused exclusively on impeccable design typography, instant 1-minute creation, and effortless simplicity. The tool turned out so intuitive and fast that clients and fellow creatives kept asking how we made our invoices. That’s when we knew we had to turn it into a dedicated SaaS product for everyone.

The Problem

The Illustrator Nightmare

Spending hours adjusting vector margins, manual calculations, and typesetting invoices in Illustrator just to get paid. Existing software was overpriced, bulky, and visually uninspiring.

The Breakthrough

The Studio's Secret Tool

We built a clean, lightning-fast billing generator tailored for creators: instant line-item math, designer-grade templates, deposit receipts, and one-click PDF exports.

The Evolution

From Internal Tool to SaaS

Clients and peers loved the invoice aesthetics and asked for access. We rebuilt it from the ground up as a complete, accessible cloud platform for freelancers, agencies, and businesses worldwide.

Got Questions?

Frequently Asked Questions

Everything you need to know about GMS Invoice Manager and how it works.

No credit card or initial sign-up is required to explore the app! You can open the web app immediately, test all templates, customize line items, and preview invoices in real time. When you are ready to export your vector PDFs or save your data, you can quickly create a free account with Google or Email in seconds.

Yes. You can upload high-resolution business logos, configure company details and tax IDs, draw or upload official digital signatures, and even add payment QR codes to your invoices.

You can issue invoices in any major currency (USD, NGN, GBP, EUR, CAD, AUD, etc.). With Dual Currency enabled, the invoice will automatically calculate and display the equivalent exchange total (e.g. billing a US client in USD while showing the exact NGN conversion rate for domestic bookkeeping).

Your data is securely synchronized to encrypted cloud storage when signed in. You also have 100% control to export full JSON backups (.gmsbackup) at any time or connect your Google Drive account for automatic scheduled backups.

Yes! GMS Invoice Manager is fully responsive and built as a Progressive Web App (PWA). You can open it in any mobile browser on iOS and Android or install it directly to your phone's home screen for an app-like experience.

Invoicing Designed for Creators & Modern Businesses