Invoice Ninja vs Knowify
Updated June 2026 · A structured head-to-head comparison.
Open-source invoicing and payments.
The verdict
Both Invoice Ninja and Knowify are credible invoicing billing tools, and the right pick comes down to your priorities.
Choose Invoice Ninja if you want a lower starting price (free – $10/mo) and a free plan to start on. Open-source invoicing and payments.
Choose Knowify if you'd rather have a longer free trial (14 days). Job costing for contractors.
Invoice Ninja vs Knowify: side by side
| Dimension | Invoice Ninja | Knowify |
|---|---|---|
| Starting price | Free – $10/moWinner | From $99/mo |
| Free plan | YesWinner | No |
| Free trial | — | 14 daysWinner |
| Pricing model | Freemium | Subscription |
| Best for | Freelancers, Developers | Contractors, Trades |
| Platforms | Web, Self Hosted, Ios, Android | Web, Ios, Android |
| Rating | 4.6/5 | 4.5/5 |
Invoice Ninja key facts
- Vendor
- Invoice Ninja
- Pricing
- Freemium — Free – $10/mo
- Free tier
- Yes
- Platforms
- Web, Self Hosted, Ios, Android
- Best for
- Freelancers, Developers
- Editor rating
- 4.6 / 5
- Founded
- 2014
- Headquarters
- Israel
Knowify key facts
- Vendor
- Knowify
- Pricing
- Subscription — From $99/mo
- Free tier
- Free trial (14 days)
- Platforms
- Web, Ios, Android
- Best for
- Contractors, Trades
- Editor rating
- 4.5 / 5
- Founded
- 2012
- Headquarters
- New York, NY, USA
Frequently asked questions
Is Invoice Ninja better than Knowify?
Neither is universally better — Invoice Ninja edges ahead on overall rating, but the best choice depends on price, platforms, and your use case. See the side-by-side table above.
Is Invoice Ninja or Knowify cheaper?
Invoice Ninja is the more affordable of the two to get started, at free – $10/mo. Invoice Ninja starts at free – $10/mo; Knowify starts at from $99/mo.
Can Invoice Ninja replace Knowify?
Yes for most teams — both are invoicing billing tools with heavily overlapping features. The main trade-offs are pricing and platform support, covered in the comparison above.