Knock vs SMTP2GO
Updated June 2026 · A structured head-to-head comparison.
The verdict
Both Knock and SMTP2GO are credible API tools tools, and the right pick comes down to your priorities.
Knock - Notifications infrastructure.
SMTP2GO - Reliable SMTP and email API for sending at scale
Knock vs SMTP2GO: side by side
| Dimension | Knock | SMTP2GO |
|---|---|---|
| Starting price | Free - $250/mo | Free |
| Free plan | Yes | Yes |
| Pricing model | Freemium | Freemium |
| Best for | Product Teams, Developers | Developers, Smb |
| Platforms | Web, API | API, Web |
| Rating | 4.7/5 | 4.6/5 |
Knock key facts
- Vendor
- Knock
- Pricing
- Freemium - Free - $250/mo
- Free tier
- Yes
- Platforms
- Web, API
- Best for
- Product Teams, Developers
- Editor rating
- 4.7 / 5
- Founded
- 2021
- Headquarters
- New York, NY, USA
SMTP2GO key facts
- Vendor
- SMTP2GO
- Pricing
- Freemium - Free
- Free tier
- Yes
- Platforms
- API, Web
- Best for
- Developers, Smb
- Editor rating
- 4.6 / 5
- Founded
- 2006
- Headquarters
- Christchurch, New Zealand
Frequently asked questions
Is Knock better than SMTP2GO?
Neither is universally better - Knock 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 Knock or SMTP2GO cheaper?
Knock is the more affordable of the two to get started, at free - $250/mo. Knock starts at free - $250/mo; SMTP2GO starts at free.
Can Knock replace SMTP2GO?
Yes for most teams - both are API tools tools with heavily overlapping features. The main trade-offs are pricing and platform support, covered in the comparison above.
Side-by-side software breakdowns and pricing changes - in your inbox monthly.