OnPay vs Paychex Flex
Side-by-side from the Top 11 ranking of The 11 Best Payroll Software for SMBs (2026). Last verified May 31, 2026.
The short answer
OnPay ranks higher on Top 11 (#4 vs #6) for Small business owners running payroll without in-house HR. Offers a single, transparently priced plan with great support and features for niche industries.
At a glance
| OnPay | Paychex Flex | |
|---|---|---|
| Top 11 rank | #4 / The 11 Best Payroll Software for SMBs (2026) | #6 / The 11 Best Payroll Software for SMBs (2026) |
| Score (out of 9.4) | 8.6 | 8.2 |
| Best for | Niche industry features | All-in-one HR services |
| Pricing | $ ($46+/mo) | $$$ (Varies by quote) |
| HQ | Atlanta, USA | Rochester, USA |
| Founded | 2007 | 1971 |
OnPay
Offers a single, transparently priced plan with great support and features for niche industries.
onpay.comSee full entry in The 11 Best Payroll Software for SMBs (2026)
Paychex Flex
A comprehensive HR platform from an industry veteran, ideal for businesses needing more than just payroll.
www.paychex.com/paychex-flexSee full entry in The 11 Best Payroll Software for SMBs (2026)
Methodology and scoring weights live at /methodology. No vendor pays for placement — see about.