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App template

Invoicing template for freelancers and service firms

Create professional invoices, track payments, and follow up on overdue balances without a full ERP. This invoicing template models clients, line items, and payment applications so solo operators and small firms get paid with clear aging.

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invoices.studio.bizBilling
Aging overview

Issue invoices, record payments, send reminders, and report aging.

Open AR$86k
Overdue$19k
Sent this week28
  • INV-1042 — NorthwindDue in 5d · $12,400
  • INV-1038 — Contoso14d overdue · Reminder 2
  • Payment — ACHApplied · INV-1031

What's included

Issue invoices, record payments, send reminders, and report aging.

Intended users

  • Founders
  • Bookkeepers
  • Account managers

Suggested stack

  • PostgreSQL
  • Next.js
  • PDF generation

Core features

Invoice drafts and numbering

Taxes and discounts

Payment recording

Overdue reminders

Aging reports

Main workflows

Send invoice

Finalize numbering, email PDF link, mark sent.

Apply payment

Record tender, allocate to invoices, close balances.

Chase overdue

Filter aging, send reminder, log contact.

Database model / entities

Distinct domain entities — not a renamed generic CRUD list.

ClientBill-to party with terms and currency.
InvoiceDocument with lines, due date, and status.
Line itemProduct or service with qty and rate.
PaymentAmount applied to one or more invoices.

User roles

  • Owner
  • Bookkeeper
  • Client viewer

Possible integrations

Applications built from this template can connect to these services via their APIs.

  • Stripe
  • PayPal
  • Resend
  • QuickBooks export

Example prompt

Copy this into Evonx to start from a production-shaped brief instead of a blank canvas.

Build an invoicing app with clients, invoices, line items, and payments. Include tax, discounts, aging, reminders, and PDF send. Use PostgreSQL with owner and bookkeeper roles.

How Evonx customizes this template

Start from the domain model above, describe the workflows your team needs, and Evonx generates a working preview you can refine. For teams with an existing codebase, the same agent can extend repositories instead of starting from a blank project.

Related resources

Build invoicing with AIReady to ship invoicing software your finance team owns in GitHub? This commercial page covers outcomes and prompts—the CRM templateTrack leads, accounts, and pipeline stages with activities your team can evolve in production. This template maps a B2B SaaS templateLaunch a multi-tenant product skeleton with auth, settings, and billing integration points.Admin dashboard templateCentralize configuration, user management, and monitoring for internal operators.Customer portal templateLet customers view orders, tickets, documents, and profile data without emailing your team.Inventory management templateTrack SKUs, warehouses, adjustments, and low-stock signals for fulfillment teams.

FAQ

Can one payment cover multiple invoices?

Yes. Payments can allocate across open invoices so partial and bulk settlements stay accurate.

How are invoice numbers assigned?

Drafts finalize into a sequential numbering sequence you control per entity or year.

Do clients get a portal to pay online?

Client viewer links can show open invoices and pay via Stripe or PayPal when you wire those integrations.

Is this a full accounting suite?

It covers AR invoicing and collections. Full GL, AP, and tax filing usually connect via export or your accounting tool.

Build production software with Evonx

Start from a template or connect an existing repository. Evonx helps you ship real applications with preview, evolution threads, and pull-request delivery—not disposable demos.

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