# Billproof — Software Invoice Guides and Tool Comparisons

> Free software invoice reference. Find the invoice. Know the next step.

Find where your software vendor keeps invoices, who has billing access, and how to download the document. If the same work keeps coming back, compare ways to make it easier.

487 invoice guides · Official sources linked · No signup required

- [Find an invoice guide](https://billproof.io/guides)
- [Compare invoice tools](https://billproof.io/compare/invoice-collection-tools)

## Start with your vendor

- [Find OpenAI invoices](https://billproof.io/guides/find-openai-invoices)
- [Find Anthropic invoices](https://billproof.io/guides/find-anthropic-invoices)
- [Find Google Workspace invoices](https://billproof.io/guides/find-google-workspace-invoices)
- [Find Xero invoices](https://billproof.io/guides/find-xero-invoices)
- [Find GitHub invoices](https://billproof.io/guides/find-github-invoices)
- [Find Slack invoices](https://billproof.io/guides/find-slack-invoices)

## Start with the task in front of you.

A one-off invoice download may need only a guide. Recurring work may need a better handoff or a tool.

### Find the right billing page.

Follow the manual steps for your vendor, with the required account role and official sources alongside them.

[Browse invoice guides](https://billproof.io/guides)

### Understand the handoff.

Check whether the vendor sends a document by email or keeps it behind a billing login. Identify who can retrieve it.

[Explore invoice delivery](https://billproof.io/research/software-vendors-that-email-invoices)

### Choose a workflow that fits.

Compare a shared inbox, email processing, portal collection and bookkeeping tools when the same work keeps returning.

[Compare invoice tools](https://billproof.io/compare/invoice-collection-tools)

## From a missing invoice to a usable record.

The billing owner and the person preparing expenses are often different people. The guides make that dependency explicit.

### Identify the billed account

Check the vendor, plan and billing owner. Personal subscriptions, team workspaces and API accounts can have different billing pages.

### Retrieve the document

Use the guide and linked vendor documentation. If you do not have billing access, ask the account owner for the invoice.

### Check the evidence

Confirm the company, billing period, amount and currency before passing the document to the person handling expenses.

## Email delivery and portal access are different jobs.

A payment alert or a link to a billing portal is not the same as receiving an invoice file. Check what your vendor actually sends before choosing an email-processing tool.

- [Email delivery research](https://billproof.io/research/software-vendors-that-email-invoices)
- [Portal invoice research](https://billproof.io/research/software-vendors-with-portal-invoices)

## Sources beside the advice.

Guides link to vendor documentation and show their review date. Tool comparisons distinguish published capabilities from hands-on testing, and name the access and plan limits that matter. A listed vendor does not imply a working Billproof connection.

- [Editorial standards](https://billproof.io/about)
- [Vendor reference](https://billproof.io/integrations)

## Help shape what Billproof builds next.

The guides and comparison are available now. The software product remains an early-access experiment. If you want to discuss future tools, tell us where your current workflow falls short.

- [Request early access](https://billproof.io/#early-access)
- [See founding pricing](https://billproof.io/pricing)

## For agents

- [When to use Billproof and how to call it](https://billproof.io/agent-instructions.md)
- [LLM index](https://billproof.io/llms.txt)
- [Public vendor registry JSON](https://billproof.io/api/public/vendors.json)
- [Sitemap](https://billproof.io/sitemap.xml)

Contact: [hello@billproof.io](mailto:hello@billproof.io).