head to head · open source
Polar vs invoicerr
Polar has 10,270 GitHub stars, 787 forks, 141 open issues and last shipped yesterday. invoicerr has 721 stars, 57 forks, 41 open issues and last shipped yesterday. Polar leads on adoption by 1,324% (10,270 vs 721 stars). Polar is written in Python under Apache-2.0; invoicerr is written in TypeScript under AGPL-3.0. Polar has attracted 8% as many forks as stars, invoicerr 8%. Polar was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (react), 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
| Polar | invoicerr | |
|---|---|---|
| GitHub stars | ★ 10K | ★ 721 |
| License | Apache-2.0 | AGPL-3.0 |
| Written in | Python | TypeScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 787 | ⑂ 57 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Polar if
- You weight community size — 10K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick invoicerr if
- You want the invoicerr feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and invoicerr fits your workflow better
About Polar
Polar is an open source billing platform and payment infrastructure project for digital products, SaaS applications, and AI workloads. It is written in Python, licensed under Apache 2.0, and built around FastAPI, Next.js, React, and Turborepo. The project positions itself as a financial layer for software that needs to charge for tokens, agents, compute, subscriptions, and usage based models.
read the full Polar overview →
About invoicerr
Invoicerr is open source freelance focused invoicing app. It creates quotes, generates invoices, tracks payments, and collects secure signatures. It lives in open source business software and finance & accounting ecosystem. Project uses TypeScript, React, NestJS, Prisma, SQLite or PostgreSQL, and AGPL 3.0 license. GitHub shows 721 stars, 57 forks, 41 open issues, one year repo age, and last push on 2026 09 15.
read the full invoicerr overview →
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Frequently asked questions
Is Polar or invoicerr more popular?
Polar has 10,270 GitHub stars and invoicerr has 721. Polar has the larger community by that measure.
Are Polar and invoicerr free?
Both are open source. Polar is licensed under Apache-2.0 and invoicerr under AGPL-3.0. Neither carries a licence fee.
What is the difference between Polar and invoicerr?
Polar is written in Python and invoicerr in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Polar or invoicerr?
Choose Polar if you want the larger community (10,270 stars) or its Apache-2.0 licence terms. Choose invoicerr if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.