The Zero-SaaS
Automated Document & Invoice Engine.
Stop spending 10 to 25 minutes manually creating, formatting, and emailing individual invoices. Our custom Google Apps Script engine compiles multi-line spreadsheet rows into bespoke branded A4 PDFs in seconds: vaulted directly to Google Drive with automated Gmail draft pipelines.
Old Manual Billing Workflow
Automated Sheet Engine Execution
Your total time spent is reduced to however long it takes to type data rows into your Google Sheet. Confirm the line items, and the engine compiles the PDF, vaults it to Drive, and prepares your email pipeline instantly.
Engineered for Precision. Built to Own.
Unlike simple off-the-shelf software, our custom script handles complex multi-line calculations, automatic PDF rendering, flexible email pipelines, and two-way spreadsheet synchronization.
Multi-Line Item Grouping
Automatically aggregates multiple rows sharing the same Document Number. Computes line sub-totals, cleans raw text input, and formats grand totals to standard UK GBP (`en-GB`) automatically.
Bespoke A4 HTML Compiler
Compiles crisp, print-ready PDF documents using custom HTML/CSS blueprints with your corporate brand colors, custom headers, PO numbers, and embedded bank settlement cards (Starling, Barclays, etc.).
Automated Email Pipelines
Choose between auto-dispatching the PDF attachment directly to the client, or generating a pre-formatted draft inside your Gmail Drafts folder for 1-click human review before sending.
Not Just For Invoices. Applied To Any Document.
This exact Google Apps Script engine can be customized to generate any structured commercial document your business relies on.
Quotes & Estimates
Convert client inquiry rows into PDF quotes with automated pricing breakdowns.
Contracts & SLAs
Merge client terms and project scopes into formal legal agreements for signing.
RAMS Safety Packs
Generate subcontractor site inspection certificates and compliance document packs.
POs & Delivery Notes
Compile supplier purchase orders and dispatch receipts automatically from inventory sheets.
Xero, QuickBooks & HMRC Making Tax Digital (MTD) Synchronization
Software like Xero and QuickBooks provide rigid, uninspiring document templates that restrict your brand presentation. By connecting our custom Apps Script engine to Xero or QuickBooks APIs:
- • Bespoke PDF Branding: Generate beautiful custom A4 PDF documents that Xero's default templates cannot produce.
- • Automated Ledger Sync: When an invoice is paid in Xero or bank feeds, custom webhooks update your master Google Sheet automatically.
- • HMRC MTD Compliant: Keep your accounting compliance clean in Xero while enjoying total control over client-facing documents.
Custom Apps Script vs. SaaS Rent
| Feature | Empower Automated Engine | Subscription SaaS (Xero/QuickBooks) |
|---|---|---|
| Pricing Model | One-Time Asset (£495 – £745) | £300–£700+ Recurring Every Year |
| Data Ownership | 100% Sovereign inside your Google Drive | Locked inside 3rd-party vendor servers |
| Customisation | Bespoke HTML/CSS layouts & terms | Rigid pre-built templates |
| Line Item Limit | Unlimited multi-line grouping per sheet | Tiered limits or extra user charges |
| Workflow Speed | 1-Click batch PDF rendering & auto-link | Manual form filling page-by-page |
One-Time Investment. Zero Subscription Rent.
Whether you already have an invoice template or need a brand-new custom PDF built from scratch, choose the package that fits your setup.
Template Integration
Have Your Own TemplateHave an existing invoice template you love? We install our Apps Script engine directly into your Google account and connect it to power your current setup.
- Existing Template Integration: Connects to your current Google Doc / Sheet invoice layout
- Multi-Line Grouping Script: Auto-groups rows by Document Number with GBP formatting
- Drive Vaulting & Email Pipeline: Saves PDFs to Google Drive and triggers Gmail send/drafts
- 2-Way Binding: Updates row status to "Generated" and writes back live PDF URLs
- 1-on-1 Handover & Video Training Session
Bespoke Branded PDF
Need A Custom PDF DesignedDon't have a template or want a new custom design? We build the full automation engine PLUS design and code a custom HTML/CSS A4 invoice blueprint tailored to your brand.
- Everything in Template Integration, PLUS:
- Custom HTML/CSS Design: A4 blueprint built from scratch to match your logo & brand palette
- Bank Settlement Cards: Embedded payment instruction boxes (Starling, Barclays, Sort/Account)
- Brand Consultation & Custom Payment Terms Formatting
- Lifetime Script Maintenance Safeguard
Lifetime Peace of Mind Guarantee
Your investment is permanently protected. If Google updates its Apps Script runtime API or if you ever experience an execution glitch, we fix it at zero extra charge. You pay once for code you own forever.
"That's actually genius! The invoicing automation Nicola built saves me at least 5 hours a week. No more copy-pasting line items or manually saving PDFs to Google Drive."Chris Hughes, CGH Joinery
Frequently Asked Questions
Can the engine handle multiple items on a single document?
Yes. Unlike basic scripts that only process one row per PDF, our engine groups all matching Document Numbers into a single blueprint with unlimited item rows, sub-totals, and calculated totals.
How does the automated email pipeline work?
You can choose between two modes: automatically emailing the generated PDF attachment directly to your client via Gmail, or creating pre-formatted email drafts inside your Gmail Drafts folder for one-click human review before sending.
Can this system connect to Xero, QuickBooks, or HMRC MTD?
Yes. While software like Xero enforces rigid document templates, we can connect our script via custom API webhooks so that when an invoice is marked paid in Xero or bank feeds, your master Google Sheet ledger updates automatically.
Can this engine be used for non-invoice commercial documents?
Absolutely. The underlying compilation engine can be adapted to compile quotes, estimates, Service Level Agreements (SLAs), subcontractor RAMS safety packs, delivery notes, and purchase orders.
Where are the generated PDF files stored?
PDFs are automatically created directly inside your designated Google Drive target folder. The script then inserts the live Google Drive PDF URL into your spreadsheet so your team can open any file with one click.
Do I need a Zapier, Make, or third-party subscription?
No. The engine runs natively inside your own Google Workspace account via Google Apps Script. There are zero recurring monthly third-party software subscriptions.
Ready to Automate Your
Document Workflow?
Eliminate manual invoice compilation, stop paying monthly software rent, and own your financial automation infrastructure forever.
Book Your Setup Now