Best Invoice Automation Software
Bill.com is the best invoice automation software for businesses that need full accounts-payable workflows — approvals, scheduling, and payment execution in one platform. If your need is specifically automating the data entry of incoming supplier invoices, Nika does that for {price} per processed invoice with no monthly fee. Stamplia and DocuPhase serve higher-volume enterprise needs.
"Invoice automation" means different things to different people. For some, it is getting supplier invoices into their books without manual typing. For others, it is the entire accounts-payable workflow — capture, approval routing, scheduling, and payment. We separated tools by what they actually automate, so you can match the tool to your real bottleneck.
How we evaluated: We assessed each tool on: (1) which part of the invoice lifecycle it automates — capture, approval, payment, or all three, (2) pricing model — per-invoice vs subscription and how that scales, (3) integration with accounting software, (4) setup complexity, and (5) suitability for small business vs enterprise. We prioritised clarity about what each tool does and does not do.
Bill.com
Full accounts-payable automation — capture, approval, payment
Best for: Businesses that want the complete AP workflow: invoice capture, approval routing, and payment execution.
$45/month
Pros
- ✓ End-to-end AP: capture invoices, route for approval, schedule and execute payments
- ✓ AI invoice capture extracts data from emailed or uploaded invoices
- ✓ Integrates with QuickBooks, Xero, Sage, Oracle NetSuite
- ✓ Handles both domestic and international payments
Cons
- ✗ Monthly subscription starts at $45/user/month — costly for low volume
- ✗ Designed for US-centric payment workflows; international coverage varies
- ✗ More functionality than a solo operator typically needs
- ✗ Approval workflows require configuration that assumes a finance team
Stamplia
AI-powered invoice capture with supplier portal
Best for: Mid-size businesses processing 500+ invoices/month that need centralised capture.
Custom pricing
Pros
- ✓ Strong AI extraction across many invoice formats and languages
- ✓ Supplier portal for direct invoice submission
- ✓ Duplicate detection and validation rules
- ✓ Integrates with major ERPs and accounting platforms
Cons
- ✗ Pricing is not public — requires a sales conversation
- ✗ Focused on capture; does not handle payment execution
- ✗ Enterprise-oriented; overkill for businesses under 200 invoices/month
- ✗ Implementation may require IT support
Nika
Automated invoice filing — inbox to records, same day
Best for: Small businesses that want supplier invoices entered into their records automatically, without a monthly platform fee.
{price} per processed invoice
Pros
- ✓ Invoices go from mailbox to records with zero manual data entry
- ✓ No monthly subscription — pay per processed invoice
- ✓ Same-day processing eliminates the invoice backlog problem
- ✓ Routes uncertain invoices to you rather than guessing
- ✓ Works alongside any accounting software or spreadsheet
Cons
- ✗ Automates capture and filing only — no approval routing, no payment execution
- ✗ Does not handle the outgoing-invoice (customer billing) side
- ✗ Requires a dedicated mailbox for incoming invoices
- ✗ No workflow configuration for multi-step approval chains
DocuPhase
Enterprise AP automation with workflow and document management
Best for: Larger organisations with complex approval workflows and high document volume.
Custom pricing
Pros
- ✓ Deep workflow automation for multi-step approval processes
- ✓ Document management capabilities beyond invoices
- ✓ Strong OCR and data extraction for varied document types
- ✓ Handles complex ERP integrations
Cons
- ✗ Enterprise pricing and implementation — not suitable for small business budgets
- ✗ Requires significant setup and configuration
- ✗ Feature set is overkill for simple invoice filing needs
- ✗ Sales-led onboarding process
Xero (with Hubdoc)
Accounting platform with built-in document capture
Best for: Xero users who want basic invoice capture included in their subscription.
$15/month
Pros
- ✓ Hubdoc included free with Xero subscription
- ✓ Auto-fetches invoices from connected suppliers
- ✓ Pushes data directly into Xero bills — no manual sync
- ✓ Part of a full accounting platform
Cons
- ✗ Auto-fetch covers a limited set of suppliers — many invoices still need manual upload
- ✗ You still review and approve each captured document
- ✗ Extraction accuracy varies with invoice format complexity
- ✗ Only useful if you are already on Xero
Verdict
The right choice depends on which part of invoice processing you need to automate. If you need the full accounts-payable workflow — approvals, payment scheduling, execution — Bill.com is the clear leader. If your real problem is the bottleneck of getting supplier invoices into your records, and you do not want a monthly subscription, Nika handles that one job at {price} per invoice. For enterprises with complex workflows and high volume, Stamplia or DocuPhase justify their cost. The most common mistake is buying more platform than you need — if data entry is your only pain, a focused tool costs less and is live faster.
Questions
What is the difference between invoice capture and full AP automation?
Invoice capture means reading an invoice and extracting its data (supplier, date, amount, tax). Full AP automation adds approval routing, payment scheduling, and execution — the entire journey from inbox to paid. Nika does capture and filing; Bill.com does the full workflow. Most small businesses need capture first and may never need the rest.
Is per-invoice pricing better than a monthly subscription?
It depends on volume. If you process 20 invoices a month, per-invoice pricing at {price} is cheaper than a $45/month subscription. If you process 500, a flat subscription may be more economical. The advantage of per-invoice pricing is that you never pay for a month where nothing happens — and you never pay for invoices that are not completed.