Alternatives · Business Phones
OnSIP alternatives
As of Nov 13, 2026, the best OnSIP alternative for most people is RingCentral (3.0 GPA), first in our ranking of business phone systems. The best free one is Zadarma (3.2 GPA).
OnSIP compared with 7 alternatives: Ooma Office, Phone.com, Nextiva, RingCentral, Vonage Business Communications and 2 more.
OnSIP is a paid product, starting at $18.95 per user / month (5-user minimum). 1 of the 7 alternatives is free or has a free plan. 2 more offer a free trial.
Listings checked up to Nov 12, 2026 · Where the facts come from
Black Friday: is there a OnSIP sale?
At a glance
| Tool | Price | Free plan | Runs on |
|---|---|---|---|
| OnSIPThis tool | From $18.95/mo | No | Web, macOS, Windows, Linux, iOS, Android |
| Ooma Office | From $19.95/mo | No | macOS, Windows, iOS, Android, Browser extension |
| Phone.com | Paid | No | Web, iOS, Android |
| Nextiva | From $15/mo | No | Web, macOS, Windows, Linux, iOS, Android |
| RingCentral | Free trial · from $20/mo | Trial only | Web, macOS, Windows, iOS, Android |
| Vonage Business Communications | From $19.99/mo | No | Web, macOS, Windows, iOS, Android, Browser extension |
| Telzio | Free trial · from $50/mo | Trial only | Web, iOS, Android |
| Zadarma | Free plan · from $39/mo | Yes | Web, macOS, Windows, iOS, Android, Browser extension |
Price against what you get
OnSIP starts at $18.95 a month for each person and scores 2.7 out of 4 on features, ease of use and platforms. 1 of the 6 alternatives on this chart scores higher and starts lower: Nextiva.
Ooma Office, RingCentral, Vonage Business Communications and Zadarma score higher without starting lower.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
How each one differs from OnSIP
Ooma Office
Small business phone system with a virtual receptionist, no contract
- Ooma Office starts at $19.95 per user / month, no contract.
- Ooma Office also lists a browser extension.
- Ooma Office lists no web app and Linux app, which OnSIP has.
- Ooma Office also covers transcription, team chat and video calls.
Suits: Small offices that want desk phones without a long contract
Phone.com
Business phone service with apps, texting, fax and answering
- Phone.com lists no macOS, Windows and Linux apps, which OnSIP has.
- Phone.com also covers video calls and online fax.
Suits: Small offices that want browser and mobile apps for one business line
Nextiva
Business phone, texting and video with an optional AI receptionist
- Nextiva starts at $15 per user / month, billed annually ($23 billed monthly).
- Nextiva also covers transcription, team chat and video calls.
Suits: Small businesses that want phone, texting and video from one provider
RingCentral
Cloud phone system with texting, fax, video meetings and team chat
- RingCentral starts at $20 per user / month for 1-5 users, billed annually ($30 billed monthly).
- RingCentral lists no Linux app, which OnSIP has.
- RingCentral also covers transcription, team chat and video calls.
Suits: Businesses that want calls, texts, meetings and chat in one app
Vonage Business Communications
Business phone lines with texting, video meetings and team chat
- Vonage Business Communications starts at $19.99 per line / month for one line, plus taxes and fees.
- Vonage Business Communications also lists a browser extension.
- Vonage Business Communications lists no Linux app, which OnSIP has.
- Vonage Business Communications also covers transcription, team chat and video calls.
Suits: Small businesses that want a phone line per employee
Telzio
Cloud business phone with usage-based pricing and unlimited users
- Telzio starts at $50 per month, month-to-month, unlimited users, plus usage.
- Telzio lists no macOS, Windows and Linux apps, which OnSIP has.
Suits: Companies with many users but moderate call volume
Zadarma
Cloud PBX and virtual numbers in 110+ countries, free to start
- Zadarma starts at $39 per month for up to 10 users, billed annually ($44 monthly).
- Zadarma has a free plan, which OnSIP lacks.
- Zadarma also lists a browser extension.
- Zadarma lists no Linux app, which OnSIP has.
- Zadarma also covers transcription, AI support agent and call tracking.
Suits: Small teams that want a free cloud PBX and pay only for calls
Limits worth knowing in OnSIP
- Unlimited needs at least 5 users; the Pay-as-you-go plan does not include calling minutes.
- Many features are paid add-ons: call recording is $4.95 per user a month and enhanced queues $14.95 per user a month.
- E911 is $1.80 per user a month and each extra phone number is $2.00 a month.
- The sign-up page says OnSIP does not service locations outside the U.S. and Canada.
Common questions
What are the alternatives to OnSIP?
The alternatives to OnSIP in this directory are Ooma Office, Phone.com, Nextiva, RingCentral, Vonage Business Communications, Telzio and Zadarma. Each one has a side-by-side comparison with OnSIP.
Is there a free alternative to OnSIP?
Yes. Zadarma has a free plan alongside paid ones.
When were these prices checked?
Each listing shows its own date. On this page they run from Oct 17, 2026 to Nov 12, 2026. Vendors change prices without notice, so confirm on their site before you buy.