head to head · open source
Invoice Ninja vs SolidInvoice
Invoice Ninja has 10,464 GitHub stars, 2,793 forks, 945 open issues and last shipped yesterday. SolidInvoice has 980 stars, 248 forks, 190 open issues and last shipped yesterday. Invoice Ninja leads on adoption by 968% (10,464 vs 980 stars). Invoice Ninja is written in PHP under a custom or non-standard licence; SolidInvoice is written in PHP under MIT. Invoice Ninja has attracted 27% as many forks as stars, SolidInvoice 25%. SolidInvoice was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 4 topic tags (hacktoberfest, invoice, invoices, php), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Invoice Ninja | SolidInvoice | |
|---|---|---|
| GitHub stars | ★ 10K | ★ 980 |
| License | Custom / other | MIT |
| Written in | PHP | PHP |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 2.8K | ⑂ 248 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Invoice Ninja if
- You weight community size — 10K stars and counting
- You want the Custom / other license terms
- Your stack matches PHP
- You value the larger contributor base for long-term maintenance
pick SolidInvoice if
- You want the SolidInvoice feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches PHP
- You evaluated both and SolidInvoice fits your workflow better
About Invoice Ninja
Invoice Ninja 5 Invoice Ninja Version 5 is here! We've taken the best parts of version 4 and added the most requested features to create an invoicing application like no other. Check the Invoice Ninja YouTube Channel to get up to speed, or try the Demo now. Choose your setup Hosted: Our hosted version is a Software as a Service (SaaS) solution. You're up and running in under 5 minutes, with no need to worry about hosting or server infrastructure. Self Hosted: For those who prefer to manage their own hosting and server infrastructure. This version gives you full control and flexibility. All Pro and Enterprise…
read the full Invoice Ninja overview →
About SolidInvoice
SolidInvoice The open source invoicing platform for freelancers and small businesses. Send beautiful quotes and invoices, accept online payments, automate recurring billing — and own every byte of your data. Why SolidInvoice? Most invoicing tools force a trade off: easy to use or respectful of your data. SolidInvoice gives you both. It's a mature, production ready billing platform you can run on your own server for free, or let us host for a flat $8/month — no per client limits, no surprise tiers, no lock in. Built on Symfony 7 and PHP 8.4, it's designed to be extended, integrated, and trusted. ✨ Features 💼…
read the full SolidInvoice overview →
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Frequently asked questions
Is Invoice Ninja or SolidInvoice more popular?
Invoice Ninja has 10,464 GitHub stars and SolidInvoice has 980. Invoice Ninja has the larger community by that measure.
Are Invoice Ninja and SolidInvoice free?
Both are open source. Invoice Ninja has no licence declared in this registry, and SolidInvoice is licensed under MIT. Both are free to self-host.
What is the difference between Invoice Ninja and SolidInvoice?
Invoice Ninja is written in PHP and SolidInvoice in PHP. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Invoice Ninja or SolidInvoice?
Choose Invoice Ninja if you want the larger community (10,464 stars) or its Custom / other licence terms. Choose SolidInvoice if its feature set, stack or MIT licence fits better. Both are self-hostable.