GST invoices, quotes, reminders, and payment tracking inside Google Workspace
Create quotes, convert them to GST-ready invoices, send payment reminders, track dues, and keep a clean audit trail using Google Sheets, Docs, Drive, and Gmail.
Built for practical finance operations
GSTFlow is designed for consultants, agencies, software firms, training businesses, service companies, and small product sellers that already live in Google Workspace and want a simpler way to handle quotes, invoices, reminders, and collections.
Do the full quote-to-payment workflow without scattered tools
Create quotes fast
Build a quote in minutes with saved customer, item, and payment-term data.
Generate GST-ready documents
Produce tax invoices, bills of supply, credit notes, debit notes, and receipt acknowledgments.
Track dues and send reminders
See aging, partial payments, reminder events, and payment history in one place.
Stay audit-friendly
Keep linked records, revisions, overrides, and communication logs for every document.
Why this works better than ad-hoc spreadsheets
Most teams already use Google Sheets, Gmail, Docs, and Drive. GSTFlow turns those familiar tools into a structured invoicing and reminders workflow, without forcing a full ERP rollout.
- No need to retype quote data into invoice data
- Standardized document numbering and file storage
- Cleaner payment follow-up discipline
- Built-in workflow links between quote, invoice, payment, and notes
- Easier handoff between founder, ops, and finance helper
Everything needed for the practical day-to-day flow
- Quote creation and revisions
- Quote acceptance, rejection, and expiry tracking
- Quote to invoice conversion
- GST mode support for common cases
- Credit note and debit note handling
- Partial payment allocation
- Due-date and aging views
- Reminder scheduling and reminder logs
- PDF generation and email sending
- Multi-entity and multi-GSTIN support
Simple 4-step workflow
Configure your setup
Add your entity, GST profile, customers, catalog, and payment terms.
Create and send documents
Build a quote or invoice and send it from your Google Workspace workflow.
Track status and dues
Monitor acceptance, due dates, partial payments, and invoice aging.
Follow up with reminders
Run reminder workflows and keep a full audit trail of communications and overrides.
Ready to simplify quotes, invoices, and reminders?
Start with a lightweight setup, then unlock automation, advanced exports, and multi-entity controls as your business grows.