The free Invoice Simple alternative
Invoice by OpenApps is a free Invoice Simple alternative: Free. Unlimited invoices, no watermark. Invoice Simple's free plan: A 14-day free trial, then a paid plan; the cheapest plan allows 3 invoices a month.
What each one costs
| App | Free plan | Paid plans |
|---|---|---|
| Invoice | Free. Unlimited invoices, no watermark. | None |
| Invoice Simple | A 14-day free trial, then a paid plan; the cheapest plan allows 3 invoices a month. | No free plan after a 14-day trial. Essentials is listed at $6.99 a month for 3 invoices a month, Plus at $14.99 for 10, and Premium at $21.99 for unlimited (2026). |
You pay every month, and the cheaper plans cap how many invoices you can send.
Switching from Invoice Simple
Use Invoice: unlimited invoices, no watermark.
Guides
Questions
Is there a free alternative to Invoice Simple?
Yes. Invoice by OpenApps does what Invoice Simple does for invoicing, for free, with no sign-up.
Does Invoice Simple have a free plan?
A 14-day free trial, then a paid plan; the cheapest plan allows 3 invoices a month. That is from Invoice Simple's own site, checked October 19, 2026.
What does Invoice Simple cost?
No free plan after a 14-day trial. Essentials is listed at $6.99 a month for 3 invoices a month, Plus at $14.99 for 10, and Premium at $21.99 for unlimited (2026).
How do I switch from Invoice Simple?
Use Invoice: unlimited invoices, no watermark.
Can an AI assistant use Invoice instead of Invoice Simple?
Yes. Invoice has a public API that needs no key, so an assistant can do the job for you.
Invoice Simple is a trademark of its owner. OpenApps is not affiliated with it. Invoice Simple's paid prices above are approximate and change often; check its site for current pricing.