A real desk phone is welcome.
Connect compatible standard SIP desk phones and softphone apps. Put more than one device on an extension, or use Rinzo’s browser Softphone. Your team can mix the devices that suit their work.
Compare Rinzo
More phone system.
Less seat math.
Your AI receptionist. Your whole team. Your choice of phones. One cloud business phone system, with no per-user or per-device subscription.
$39 USD/monthFirst month free on monthly. Prepaid from $19/month with 24-month prepay ($456 upfront).
Monthly plan; then $39 USD/month. Card required. AI talk time $0.10/min on top of calling; 30 AI minutes in your free month.
AI answering + team phonesNo seat feesBring your SIP phonesAPI + CLI + agents
The differences that add up
Compare the system.
Not just the starting price.
From the next employee to the next call flow: see how Rinzo’s one-plan approach compares with familiar business phone services.
Compare across providers Scroll the chart sideways.
| What your business gets | RinzoOne plan. Your whole team. | Quo / OpenPhone[1]Starter / Business | RingCentral[2]RingEX Core | Dialpad[3]Connect Standard | Grasshopper[4]True Solo / Solo Plus |
|---|---|---|---|---|---|
| Monthly base subscription | $39 / businessUnlimited users and devices | From $19 / userStarter; Business $33 / user | From $30 / userCore, month to month | From $27 / userStandard, month to month | From $18 / accountTrue Solo: 1 user; Solo Plus $32 / account |
| Unlimited usersWithout per-user subscription fees | IncludedNo per-user subscription fee | Per-user pricing | Per-user pricing | Per-user pricing | Unlimited on Solo PlusTrue Solo is 1 user; extension allowances vary |
| Devices for your team | Unlimited devicesNo per-device subscription fee | Mobile, desktop and web apps | Licensed users + supported phones | Licensed users + supported phones | Mobile/desktop apps + number forwarding |
| AI receptionist | Built into the plan$0.10/min while it talks, on top of calling | Sona included10 calls included; paid tiers and overages | AIR add-onFrom $39/month plus RingEX; 100 AI minutes | Separate AI Agents offeringCustom pricing; contact sales | Separate SmithAI serviceAI receptionist starts at $95/month |
| SIP desk phonesDirect connection to your phone system | Connect compatible SIP phonesDesk phones, SIP apps and browser calling | Not supportedNo desk-phone support | Supported modelsBring your own eligible desk phone | Supported modelsGeneric SIP also available with restrictions | Forwards to an existing phone numberDirect SIP registration not documented |
| Call routing | In the one planMenus, ring groups, schedules and advanced callflows | Business tierPhone menus, transfers and custom ring orders | IVR and basic queues in CoreAdvanced queue rules on Advanced | Department IVR and routingIncludes schedules and ring strategies | Extensions, schedules and forwarding rules |
| API & automation | API + CLI + MCP + agent skillConfigure people, phones and routing | API and MCP included | APIs included from Core | Open APIs and webhooks on Pro / Enterprise | No public APIPer the provider’s published information |
Base subscriptions, not matched total bills. Rinzo includes one local number and 100 pooled calling minutes, then $0.02/min; AI talk time is $0.10/min on top of calling. Competing plans differ in included numbers, calling, messaging and AI allowances. Taxes, add-ons, hardware and usage can change totals. See Rinzo’s full pricing →
Built around your business
Keep your SIP phones.
Change the possibilities.
Your phone system should fit the way you work—not make every person use the same app.
Connect your phones →Encrypted endpoint connections
TLS signaling.
SRTP audio.
Encrypt the connection between compatible SIP phones and Rinzo with SIP over TLS and SRTP. The browser Softphone encrypts its connection automatically.
SIP-phone encryption requires matching phone and Rinzo device settings. This protects the endpoint-to-Rinzo connection; it is not end-to-end encryption across the public telephone network.
How Rinzo protects your connection →Your business is not a fixed template.
Build menus, ring groups and fallback paths. Change destinations for office hours, lunch and holidays. Put AI answering where it belongs in the call flow, with Advanced Callflows when you need custom routing.
Click it. Script it. Ask your agent.
The Control panel and CLI use the same API. An authorized agent can configure people, devices, receptionists and routing—and you can still edit the result yourself.
See what your agent can manage →A cloud PBX. Not just an app.
Hosted business calling with redundant service roles and tested failover paths. Grow your extensions, phones and routing in the same account, without managing a phone server yourself.
View service status ↗Growth without the seat bill
More people.
Same base subscription.
Give the next employee an extension—not another monthly seat fee.
1 person$39Rinzo monthly base
5 people$39Rinzo monthly base
10 people$39Rinzo monthly base
On per-user plans, a 5-person base subscription: Quo Starter $95/month / Business $165/month · RingCentral RingEX Core $150/month · Dialpad Connect Standard $135/month. Before taxes, AI and other add-ons; included usage differs.
Unlimited refers to users and devices, not calling minutes, simultaneous calls or storage. Usage and extra numbers are separate. Start with one number; expand your people, phones and routing in the same account. What’s included →
Sources & comparison details Checked November 4, 2026
Selected differences in published plans, not a voice-quality benchmark or an exhaustive feature inventory. Prices use standard month-to-month billing in USD, not annual promotional equivalents. The chart covers the named standard phone plans: other bundles and negotiated offers may differ. Product names belong to their respective owners.
- Quo / OpenPhone: Plans, routing and Sona pricing · Desk-phone support · Included API.
- RingCentral: RingEX plans and routing · AI Receptionist pricing · Certified and supported desk phones.
- Dialpad: Connect plans, APIs and AI Agents · AI receptionist offering · Supported phones · Desk-phone support and generic SIP limitations.
- Grasshopper: Plans and account pricing · Published pricing and API information · Phones and forwarding · Virtual receptionist service.
Rinzo: Pricing and usage, phone-system features, endpoint encryption, phone settings and API, CLI and agent workflows. Every term renews automatically; turn renewal off in Billing. Number availability varies by area code.
Your business. Your first month free.
Your whole team.
Your kind of phone system.
A phone system for your team, an AI receptionist, a business number and 100 minutes.
$39 USD/monthFirst month free on monthly. Prepaid from $19/month with 24-month prepay ($456 upfront).
Start your free monthMonthly plan; then $39 USD/month. Card required. AI talk time $0.10/min on top of calling; 30 AI minutes in your free month.