Crater
Free, open-source invoicing and expense tracking application for freelancers and small businesses.
About Crater
Crater is a free, open-source invoicing tool built for freelancers and solo operators who want to own their billing data without paying FreshBooks or Wave monthly fees. Day-to-day, it handles multi-currency invoices with tax line items, converts estimates to invoices in one step, logs expenses with receipt attachments, and sends payment reminders. You can self-host it on your own server or use Crater's cloud instance. Stripe, PayPal, and Razorpay connect for online payment collection. It fits independent contractors, early-stage sole traders, and small bookkeeping practices that invoice fewer than 50 clients and don't need inventory, project time-tracking, or payroll. If your clients pay in multiple currencies, the tax and currency handling is functional without requiring a paid upgrade. The tradeoffs are real. Crater's integration list is thin compared to FreshBooks or Zoho Invoice — there's no native bank feed sync, no accountant portal, and no direct QuickBooks or Xero data export. The self-hosted route requires a server, PHP environment setup, and ongoing maintenance that a non-technical freelancer will find painful. Community support is the primary help channel; there's no dedicated customer service. If your invoicing volume grows or your clients demand more sophisticated reporting, you'll outgrow Crater faster than you expect.
Best for
Freelancers wanting free, self-hosted invoicing and expense tracking software
Key Features
- Multi-currency invoicing with tax calculations
- Expense tracking with receipt attachments
- Invoice estimate to invoice conversion
- Payment status tracking and reminders
Pros & Cons
Pros
- Fully free for self-hosted deployment — no per-invoice or per-client fees regardless of volume
- Multi-currency invoicing with configurable tax rates handles international freelance billing without a paid tier
- One-click estimate-to-invoice conversion cuts duplicate data entry on project-based work
- Expense logging accepts receipt photo attachments, giving you a basic paper trail without a separate app
- Open-source codebase lets developers customize invoice templates, tax logic, and workflows to match firm-specific needs
- Stripe, PayPal, and Razorpay integrations enable online payment collection directly from the invoice link
- Data stays on your own server if self-hosted, removing vendor lock-in and third-party data-sharing concerns
Cons
- No native bank feed or transaction import — every expense must be entered manually, which doesn't scale past a handful of clients
- Zero integration with QuickBooks, Xero, or any accounting general ledger, so you'll double-enter data at tax time
- Self-hosting requires a PHP server environment; freelancers without technical background will need paid help to set it up and maintain updates
- Support is community forums only — no ticket system, no live chat, no guaranteed response time
- Reporting is minimal: no profit-and-loss view, no aged receivables summary, and no client revenue breakdown beyond raw invoice lists
- Smaller user base than Wave or FreshBooks means fewer third-party tutorials, fewer accountants familiar with its export formats, and slower bug resolution
Ledger Brief Take
Crater fills the gap for practitioners who want invoicing control without vendor lock-in, offering genuine self-hosting alongside standard cloud deployment. The open-source foundation means you can customize workflows and maintain data ownership, but you'll trade the polish and integrations of established players like FreshBooks or Wave for that flexibility.
Frequently Asked Questions
Common questions accountants ask about Crater.
Is Crater actually free, or are there hidden costs?
The self-hosted version is free with no usage limits. Crater also offers a cloud-hosted plan with a free tier and paid upgrades for additional features. Self-hosting has no software cost but you pay for server hosting, typically $5-10 per month on a basic VPS, plus your own time for setup and maintenance.
Does Crater integrate with QuickBooks or Xero?
No. Crater has no direct connection to QuickBooks, Xero, or any accounting general ledger. You can export invoices and expenses as CSV and manually import that data into your accounting software, but there is no automated sync. This is the biggest practical limitation for accountants who want a connected workflow.
How does Crater compare to Wave for a freelancer?
Wave is free, cloud-hosted, and includes bank feed imports, basic bookkeeping, and an accountant access portal — features Crater lacks entirely. Crater's advantage is data ownership through self-hosting and an open-source codebase you can modify. Choose Wave if you want a ready-to-use tool; choose Crater only if data control or customization is a firm requirement.
Who is Crater best suited for?
Freelancers and sole traders billing fewer than 50 clients who want free invoicing software and either have basic server skills or a developer on hand. It is not suited for firms that need bank reconciliation, multi-user accountant access, payroll, or integration with their existing accounting software.
Is client data secure in Crater?
Security depends entirely on how you deploy it. Self-hosted means you control the server, backups, and SSL certificates — security is your responsibility. Cloud-hosted through Crater shifts that responsibility to the vendor, but Crater has not published a formal security audit or SOC 2 report. For practices handling sensitive client financials, that absence is worth noting.
Can Crater handle VAT or GST invoicing?
Yes. Crater supports configurable tax rates per invoice line item, including compound taxes, which covers most VAT, GST, and HST billing scenarios. You set up the tax names and rates manually; there is no automatic tax jurisdiction lookup or e-filing connection.