1. Polar
percentageOpen-source monetization for developers
Open source. 4% + $0.40 per transaction (lowest MoR fees on the market).
Ease 5/5Fees 5/5Conv 2/5MoR
Best if:indie dev, open source, developers, digital products
Best Open Source Billing Tools (1970)
Open source billing tools you can self-host, audit, and extend. License terms and hosted offerings vary — check each project.
5 tools matched
Why it matters
Open source billing means no vendor lock-in on pricing model changes, full data ownership, and the option to self-host if your compliance team requires it.
2. Ghost
flat monthlyOpen-source publishing with built-in paid memberships
Open source. Self-hosted: free. Ghost(Pro): from $18/month. 0% platform fee on memberships..
Ease 3/5Fees 5/5Conv 3/5
Best if:newsletters, blogs, memberships, indie creators
3. Easy Digital Downloads
flat annualSell digital products on WordPress
Open source. Personal $99/year. Extended $199/year. Professional $299/year..
Ease 4/5Fees 4/5Conv 2/5
Best if:wordpress, digital products, ebooks, software
4. Lago
open sourceOpen-source metering and usage-based billing
Open source. Self-hosted: free. Cloud: from $100/month.
Ease 2/5Fees 5/5Conv 1/5
Best if:saas, ai apps, usage based, open source
5. Kill Bill
open sourceOpen-source subscription billing and payments
Open source. Open source: free (self-hosted). Cloud: from $250/month..
Ease 1/5Fees 5/5Conv 1/5
Best if:open source, self hosted, enterprise, usage based
Quick comparison
| Tool | Pricing | MoR | A/B | Ease | Fees |
|---|---|---|---|---|---|
| Polar | 4% + $0.40 per transaction (lowest MoR fees on the market) | Yes | — | 5/5 | 5/5 |
| Ghost | Self-hosted: free. Ghost(Pro): from $18/month. 0% platform fee on memberships. | — | — | 3/5 | 5/5 |
| Easy Digital Downloads | Personal $99/year. Extended $199/year. Professional $299/year. | — | — | 4/5 | 4/5 |
| Lago | Self-hosted: free. Cloud: from $100/month | — | — | 2/5 | 5/5 |
| Kill Bill | Open source: free (self-hosted). Cloud: from $250/month. | — | — | 1/5 | 5/5 |
Our pick
Polar — the best balance of ease, conversion, and fees. Open-source monetization for developers.
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