Chat-based invoice drafting
Start an invoice by sending the job details in plain English. WOPA turns the message into a draft and asks for missing information when needed.
Overview
WOPA is a WhatsApp-first invoicing tool for UK tradespeople. It lets you create invoice PDFs, email customers, and follow up on unpaid invoices from a WhatsApp chat instead of a separate desktop app or spreadsheet.
The workflow is built around a short chat: send the job details, review a draft, and approve the invoice before it is emailed. WOPA also tracks payment status and can run polite reminders on a schedule, which makes it useful for sole traders and small businesses that want to handle invoicing where the job conversation already happens.
Core features
Preview and approval step
Review the customer, amount, due date, and bank details before anything is sent. The invoice only goes out after you confirm it.
Email delivery of PDF invoices
Send a professional PDF invoice by email from WhatsApp. WOPA handles the invoice email while keeping the conversation in chat.
Automated payment chasing
Keep unpaid invoices moving with reminders at 7, 14, and 28 days. You can pause, stop, or let reminders run until payment is recorded.
Invoice status tracking
Track whether an invoice is paid, outstanding, or overdue from the chat flow. You can also ask who has not paid and mark invoices as paid in WhatsApp.
UK invoice field support
Supports standard VAT, reverse-charge VAT for construction, and CIS deductions for subcontractors, with fields designed for UK trade invoices.
Common use cases
Invoice from the job chat
For electricians, plumbers, builders, and other tradespeople who want to raise an invoice while the job details are still fresh, without opening a separate invoicing app.
Send professional invoices by email
For users who want a customer-facing PDF invoice sent by email, while they manage the process from WhatsApp and confirm the draft before sending.
Chase unpaid invoices
For businesses that need a simple follow-up process for overdue work, including scheduled reminders and a quick way to check who still owes money.
Handle UK trade tax fields
For UK businesses that need invoice fields for VAT, reverse-charge VAT, and CIS deductions without building the invoice manually each time.
Replace spreadsheets for basic invoicing
For sole traders and small limited companies that want a lightweight invoicing flow without spreadsheets or a full accounting package.
Pros and Cons
Pros
- Creates invoice drafts directly from a WhatsApp message.
- Emails a PDF invoice to the customer after user approval.
- Includes payment reminders on a 7, 14, and 28 day schedule.
- Supports VAT, construction reverse charge VAT, and CIS deductions.
- Offers a free tier with 3 invoices per month.
Cons
- Custom sending domains are not available yet.
- WOPA is not currently HMRC-recognised or MTD-compatible software.
FAQ
Do I need to download an app?
No. WOPA lives in WhatsApp, where you send the job details and approve the draft before anything is emailed out.
Can I edit before sending?
Yes. WOPA shows a draft invoice and asks for confirmation before sending the PDF or a follow-up message.
Can I turn reminders off?
Yes. You can pause or stop reminders for a specific invoice, and marking an invoice as paid also stops future reminders.
Do customers need WhatsApp?
No. Customers receive the invoice by email as a PDF attachment; WhatsApp is the control surface for the sender.
Does WOPA support VAT?
Yes. WOPA supports standard VAT, reverse-charge VAT for construction, and CIS deductions for subcontractors.
Quick Facts
- Category
- WhatsApp invoicing
- Primary users
- UK tradespeople, sole traders, and small limited companies
- Platform
- WhatsApp chat workflow with email delivery
- Pricing
- Free for 3 invoices per month; founder pricing is £9.99/month for early beta customers
- Source domain
- mywopa.com
- Status
- Live beta
WOPA 대안
Liam
Liam is an AI copilot for managing inboxes, writing replies, prioritizing email, and scheduling meetings. It is offered free for individuals, with custom pricing for teams and enterprise.
AI PDF Summarizer
PDF 문서를 빠르고 효율적으로 요약하는 AI 기반 도구로, 명확한 통찰력을 제공하고 사용자가 콘텐츠와 상호작용할 수 있도록 합니다.
Paperpal
Paperpal 是一款面向学术写作的 AI 工具，提供文献阅读、语言润色、引用、查重、AI 检测和投稿前检查。它适合需要在英文论文和学术材料上进行写作、修改与合规自检的学生、研究人员和教师。
dirac
Dirac is an AI email assistant that prepares a morning brief, prioritizes important threads, and drafts replies in your voice. It is positioned for founders and other busy professionals who use Gmail and want to reduce morning inbox triage.
AgentMail
AgentMail is an email inbox API for AI agents that lets developers create, send, receive, and search messages through REST APIs and SDKs. It supports agent workflows such as threaded replies, verification, customer support, scheduling, and inbox-based approvals.
PDFTools
PDFTools is a browser-based suite of free and premium PDF utilities for editing, conversion, and document handling. It helps users work on PDFs locally in the browser without uploading files to a server.