Invoice apps for Shopify, compared honestly
FlatInvoice vs Sufio vs Order Printer Pro vs Shopify's free Order Printer — real pricing, real features.
Every one of these apps turns a Shopify order into a PDF invoice or packing slip. The differences are price ceiling, how much accounting/compliance depth you need, and how much setup time you're willing to spend. Here's where each one actually wins.
| Factor | FlatInvoice | Sufio | Order Printer Pro | Order Printer (free, Shopify) |
|---|---|---|---|---|
| Price | $9/mo flat — one plan | $7 / $19 / $49 / $129 per month | Free to install, $10 / $20 / $40 per month for full features | Free |
| Free trial | 7 days | 14 days | 14 days | N/A — free |
| Setup | Business details, accent color, VAT/GST registration + gap-free sequential invoice numbers — one click | Full invoice builder, tax/VAT rules, multi-currency | Template builder, PDF customization | Basic templates, needs Liquid edits to customize |
| Compliance / e-invoicing | Sequential (gap-free) invoice numbers + your VAT/GST registration on every PDF; no PEPPOL e-invoicing | PEPPOL e-invoicing, EU VAT compliance built in | Custom templates, no e-invoicing standard | None — bare-bones template |
| Auto-email invoices to customers | Yes — opt-in, one toggle (on order or fulfillment) | Yes | Yes, on paid plans | No — manual print/export |
| Theme/code needed | No | No | No | Yes, for real customization |
| Track record | New (2026) — 0 reviews yet | 4.9/5, established | 4.9/5, established | Built by Shopify — no app store reviews (it's a core feature) |
| Best for | Merchants who want it done and forgotten, one flat price | Businesses needing EU e-invoicing/VAT compliance | Merchants who want deep template control without an EU-compliance need | Anyone comfortable editing Liquid for a free, basic invoice |
Where we lose, and why merchants still pick us
If you sell into the EU and need PEPPOL e-invoicing or VAT compliance, Sufio is the correct answer — that's a real feature gap we don't fill. If you want deep template control without paying for compliance you don't need, Order Printer Pro's free-to-install tier is worth trying first. And if you're comfortable in Liquid, Shopify's own free Order Printer costs nothing.
FlatInvoice is for the merchant who wants a professional invoice/packing slip live in one click — business name, logo, accent color, gap-free sequential invoice numbers (INV-0001…), your VAT/GST registration on every PDF, and optional auto-emailed invoices to customers — at one flat $9/mo, without opening a template editor. We're new, 0 reviews yet, and we don't do PEPPOL e-invoicing. If you need that, use Sufio.
Common questions
Does FlatInvoice support VAT?
Yes — add your VAT/GST registration number and choose a Tax/VAT/GST label, and both appear on every PDF, alongside gap-free sequential invoice numbers (INV-0001, INV-0002…). What it does not do is PEPPOL e-invoicing — if you need that EU compliance standard, Sufio is built for it.
Can it email invoices to customers automatically?
Yes — flip one toggle and every customer receives their PDF invoice by email when their order is placed (or fulfilled — your choice). It's opt-in and off by default.
Is there a free option?
Shopify's own Order Printer app is free but basic and usually needs Liquid template edits to look professional. FlatInvoice is $9/mo flat with no editing required.
How long does setup take?
A few minutes — enter your business details, pick an accent color, set your tax label, and every order after that generates a matching PDF.
Does it work with existing order data?
Yes — it generates invoices and packing slips from any order in your store, past or future, in one click, no bulk import needed.
Clean PDF invoices from any order. Flat price, zero setup.
Install FlatInvoice — $9/mo, 7-day trial