Quo (formerly OpenPhone) is a business phone system. Each teammate gets a number and apps for calling and texting, and you pay per user. Sona is the AI agent built into Quo: it picks up when your team can't, and it is billed by the call. ModPhone is a standalone AI receptionist. It answers on its own number or on your forwarded business line, handles the request, and is billed by the month with minutes included.
If you need phones for your team, Quo solves a problem ModPhone doesn't. If you already have phones and want the calls answered and handled, the comparison gets closer, and it comes down to what the agent can do and how your calls are shaped.
What Quo and Sona cost, as of September 2026
Quo's pricing page shows three plans, priced per user per month:
| Quo plan | Billed yearly | Billed monthly | Notable additions |
|---|---|---|---|
| Starter | $19 | $28 | One number per user, calling and texting in the US and Canada, voicemail transcripts, Sona |
| Business | $27 | $39 | Call transfers, phone menus, HubSpot and Salesforce, AI summaries on all calls, automatic call recording |
| Scale | $36 | $48 | AI call tags, onboarding help, priority and phone support |
Every plan includes 1,000 automation credits for Sona, which Quo counts as about 10 calls (one call uses 100 credits). More calls cost extra:
| Sona tier | Monthly price | Calls included | Each extra call |
|---|---|---|---|
| 1 | $0 | 10 | $1.00 |
| 2 | $25 | 40 | $0.75 |
| 3 | $49 | 100 | $0.65 |
| 4 | $99 | 250 | $0.55 |
| 5 | $199 | 600 | $0.45 |
Quo's Sona page adds a few details: you can cap Sona's usage to avoid surprise charges, Sona answers inbound calls only, it works only inside Quo, and it speaks English, Spanish and French but can't detect or switch languages mid-call. You teach it by entering details such as your business description, hours, services, pricing and FAQs. It can take messages, answer questions, transfer calls, route to departments and text a caller a scheduling link or directions during the call.
ModPhone's plans are Starter at $49 a month (200 minutes, 200 texts), Growth at $99 (500 minutes, 500 texts, website chat) and Business at $299 (1,500 minutes, 1,000 texts, email agent). Business is the plan most customers pick. There is no per-user charge, and extra minutes cost $0.15, $0.12 or $0.10 depending on the plan.
A quick cost check
Say one owner-operator wants AI to answer about 250 calls a month, averaging three minutes each.
On Quo, that is Starter at $19 a month billed yearly plus Sona tier 4 at $99, so $118 a month, and it includes a business phone line for that person. On ModPhone, 250 calls at three minutes is 750 minutes: Growth at $99 plus 250 extra minutes at $0.12, or $129 a month.
The prices land close together. Per-call pricing like Sona's favors long calls; per-minute pricing like ModPhone's favors short ones. The bigger difference is what happens on the call.
What the agents do differently
Knowledge
Sona works from the business details and FAQs you type in. ModPhone reads your website and your documents (PDFs, Word files, Google Drive or OneDrive folders), turns them into facts, and shows you every fact so you can edit the wrong ones. That matters when the answers live in a handbook: a school district's attendance policy, a tax firm's list of documents to bring, a city's permit requirements.
Booking
Sona can text a caller a scheduling link. ModPhone books the appointment into Google Calendar or Outlook during the call, then texts the caller a confirmation to reply to.
Languages
Sona handles English, Spanish and French, one language per call. ModPhone handles 30+ languages and switches when the caller does, which helps on a bilingual line when a caller starts in English and hands the phone to a relative who is more comfortable in another language.
Channels
Quo includes texting for your team, and Sona is testing SMS lead capture. ModPhone's agent answers texts on every plan, website chat from Growth and email on Business, from one knowledge base, and it can recognize a returning customer across channels.
Phone system
Here Quo is ahead. ModPhone doesn't give your staff their own phone lines or a calling app. Quo does, along with shared numbers, group calling and integrations for HubSpot, Salesforce, Clio, Jobber and others.
Who should pick Quo with Sona
You need a phone system for your team, with a number for each person, calling apps and shared lines, and AI answering is one feature among several. Your AI call volume is low enough that the included 10 calls or a small Sona tier covers it. Your callers speak English, Spanish or French. You already use Quo and want to add AI without adding a vendor.
Who should pick ModPhone
You already have phones (Quo, a carrier line or anything else) and need the missed and after-hours calls handled properly. Your answers are in documents, not a short FAQ. You want appointments booked in your real calendar. You serve callers in many languages. Or you want texts, website chat and email answered by the same agent.
Using both
Quo lists advanced call forwarding, which sends unanswered calls to another US or Canadian number based on your business hours; check which Quo plan includes it. Point that forward at your ModPhone number, and add your Quo users' numbers as ModPhone transfer destinations, so callers who need a person can still reach one.
Common questions
Is Quo cheaper than ModPhone?
For a single user with modest AI volume, they cost about the same. As of September 2026, Quo Starter is $19 per user per month billed yearly ($28 monthly), and Sona's paid tiers run from $25 for 40 calls to $199 for 600 calls. ModPhone runs $49 to $299 a month with 200 to 1,500 minutes and no per-user fee. Quo's price also includes a phone line for each user. ModPhone's includes two-way texting on every plan, with website chat and email on the higher plans.
What languages does Sona speak?
According to Quo, Sona supports English, Spanish and French, and it can't detect or switch languages during a call. ModPhone supports 30+ languages and switches mid-call when the caller does.
What happens when Sona's calls run out?
Calls beyond your tier are billed per call, from $1.00 on the free tier down to $0.45 on the $199 tier, and Quo lets you cap usage to avoid unexpected charges. ModPhone keeps answering past your included minutes and bills the extra minutes at your plan's rate.
Does Sona work with other phone systems?
No. Quo says Sona is built to be used in Quo only. ModPhone works in front of any phone system: you forward calls to your ModPhone number, and it transfers callers back to whatever numbers you choose.
Try it on your line
Forward your missed calls to a ModPhone trial number for a month; the demo shows you the agent first, built from your own website.