If you're a freelancer or a two-person shop, paying $15-30 a month just to send a handful of PDF invoices feels absurd. That's the itch that self-hosted invoicing tools scratch: you run a small piece of open-source software on your own server (or a $5/month VPS), your client opens a link and pays or downloads a PDF, and none of your financial data ever touches a third-party SaaS company's database. Two tools built specifically for this niche keep coming up together because their authors clearly built them as answers to the same annoyance — but they made different trade-offs. Here's an honest comparison of both.
What both tools are actually solving
Neither Invio nor InvoiceShelf is a SaaS product with a login page and a pricing tier you upgrade into. Both are open-source code you deploy yourself, typically with Docker. That's the whole appeal — and also the whole catch, since "self-hosted" means you're the one responsible for keeping the server up, backed up, and patched. If that sentence makes you nervous, a hosted SaaS tool is still the safer default. If it doesn't, read on.
Invio: zero-bloat, link-and-done
Invio is built around one job: get a PDF invoice in front of a client with as little friction as possible. It's released into the public domain (Unlicense), runs via Docker, and shares invoices through a secure link — your client doesn't need to create an account to view or download it.
Strengths: genuinely free with no licensing string attached, fast to set up, and deliberately minimal — there's no feature bloat to click through.
Limits: no expense tracking, no built-in accounting, and no payment integration (Stripe or otherwise) mentioned — it produces and delivers invoices, full stop. It also doesn't support multiple companies/brands from one instance.
Verdict: pick Invio if you just need to bill clients and get out of the way — no bookkeeping, no online payment collection, just a PDF and a link.
InvoiceShelf: the fuller-featured option
InvoiceShelf aims higher: it's positioned as a self-hosted alternative to FreshBooks, not just to "sending a PDF." On top of invoices and estimates, it tracks expenses and accepts card payments directly through Stripe, and it supports multiple companies with separate branding from a single install — useful if you run more than one freelance identity or a small agency.
Strengths: invoicing, expenses and Stripe payments in one place, multi-company support, and an actively maintained project (roughly 1,800 GitHub stars, currently on its v3.x cycle).
Limits: self-hosting only — there's no official managed/SaaS version, so you carry the same hosting, backup and update responsibilities as with Invio, just for a bigger piece of software. It's also a heavier install than Invio's minimal footprint.
Verdict: pick InvoiceShelf if you want to actually get paid online (not just send a PDF and wait for a bank transfer) and want basic expense tracking without adding a second tool.
Side by side
| Invio | InvoiceShelf | |
|---|---|---|
| License / cost | Unlicense (public domain), free | AGPL-3.0, free |
| Setup | Docker, minimal footprint | Docker Compose or manual server |
| Online payments | Not built in | Stripe integration included |
| Expense tracking | No | Yes |
| Multi-company | No | Yes, with separate branding |
| Client experience | Secure link, no account needed | Standard invoice/estimate portal |
| Project maturity | Smaller, newer project | ~1,800 stars, active v3.x development |
The honest bottom line
These two aren't really fighting over the same user. Invio is for someone who wants the absolute minimum — a way to stop paying a subscription just to email a PDF. InvoiceShelf is for someone who wants that same self-hosted control but is willing to run a bigger piece of software in exchange for getting paid online and tracking expenses without a second app. Both assume you're comfortable enough with Docker and a server to accept the trade-off of "free forever" versus "someone else handles the ops." If neither trade-off appeals to you, a hosted tool like FreshBooks or Wave remains the path of least resistance — you'll just be back to paying monthly for it.