Auto-Generated Invoices with Approvals

Automatically create professional invoices from project data. Include approval workflows to streamline billing and avoid delays.

Smart Billing. Seamless Approvals.
Complete Control.

Managing project billing doesn’t have to be manual, time-consuming, or error-prone. Our Auto-Generated Invoices with Approvals feature simplifies the entire invoicing process—from task completion to payment—by combining automation, approval workflows, and flexible billing options. Whether you’re running solo projects or collaborating across teams, this system ensures accurate, compliant, and efficient invoicing every time.

Task-Based Invoice Automation

Invoices are automatically generated upon task completion, ensuring timely billing without manual entry.

Approval Workflow with Task

Built-in approval workflows enable team leads to review and approve user-submitted invoices, whether based on fixed prices or percentage completion, ensuring precise tracking and control.

Auto-Requeue for Declined Tasks

If a task is declined during approval, it is automatically returned to the project as incomplete – keeping project progress accurate and accountable.

Flexible Invoice Splitting by Contributor

Split a single task’s invoice between multiple users working on it. This feature supports collaborative work while maintaining clear, accurate compensation.

Custom Deductions for Individual Users

Apply custom deductions to user invoices, either as a fixed amount or a percentage to reflect tax deductions or project-specific agreements.

Support for Multiple VAT Schemes

Seamlessly handle various tax scenarios, including Domestic Reverse Charge and other region-specific VAT schemes, ensuring full compliance and accuracy.

Trusted by our clients and many more

Save Time & Money

By streamlining your processes with Duo App, you reduce admin overhead, eliminate inefficiencies, and focus on what really matters — getting work done.

Task-Based Invoice Automation

Invoices are automatically generated upon task completion, ensuring timely billing without manual entry.

Automatically generate invoices upon task completion, reducing manual effort

Gain instant visibility into completed tasks for full project transparency

Allow users to access and manage all their invoices in one convenient location

Approval Workflow with Task

Built-in approval workflows enable team leads to review and approve user-submitted invoices, whether based on fixed prices or percentage completion, ensuring precise tracking and control.

Review and approve submitted invoices in one centralised location, with task visibility by plot or project

Decline individual completed tasks on an invoice — they’re automatically returned to the project for completion

Include management team members in the approval workflow for streamlined oversight

Custom Deductions for Individual Users

Apply custom deductions to user invoices, either as a fixed amount or a percentage to reflect tax deductions or project-specific agreements.

Apply multiple custom deductions for each user

Choose between fixed amounts or percentages to match tax rules or project agreements

Set user-specific hourly or daily rates with ease

Trusted by our clients, and more

It has been instrumental in improving our business and our processes efficiencies.

From streamlining our sub-contractor payment process, to offering our labour force a platform for document sharing, they’ve helped us and met our needs.

— Ricky McNiece

Commercial Manager, County Plumbing

Since using DuoApp, our sub–contractor payment processes have become a breeze. It’s efficient, easy to use and looking forward to seeing how it evolves to further help our business requirements.

— Andrew Bryant

Commercial Director, Streatfields Ltd

We’ve been working with DuoApp since July 2023, moving subcontractor payments from Excel to an online platform.
They’ve been consistent, reliable, and supportive—always delivering on their promises.
The result is software that feels tailor-made for us and a partnership many would envy.
We’re now expanding DuoApp into other areas of our business—and we haven’t looked back.

— Darren Riches

Director & Co-Owner, Laser Mechanical and Electrical

Simplify site management for everyone!

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Invoiced revenue

Tasks completed

Projects completed

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