SIPSTACK vs Quo (formerly OpenPhone)
Quo, formerly OpenPhone, and SIPSTACK both sell a business phone system with an AI agent. Quo focuses on shared calling and texting for small teams, sells its Sona AI agent as an add-on with about 10 free calls a month, and prices further AI calls per call. SIPSTACK adds a full cloud PBX with desk-phone provisioning and bills AI voice-agent time per minute. Here is how the two compare on what each company publishes.
SIPSTACK and Quo at a glance
Published facts as of 21 October 2026.
| Feature | SIPSTACK | Quo |
|---|---|---|
| Pricing entry point | Nova Core from $19 USD or C$22 per user per month, billed monthly; on annual billing, $15.20 USD or C$17.60 per user per month equivalent ($182.40 USD or C$211.20 per user per year) (as of October 2026). Flare business texting from $49 USD or C$67 per month, flat, billed monthly. | Starter from $19 USD per user per month, or $15 USD billed annually (as of October 2026). Business is $33 USD and Scale $47 USD monthly.[2] |
| AI voice agent included? | Yes. Every paid Nova plan can use the Aura AI voice agent. Pro includes 5 and Ultra 25 voice-agent minutes per user each month (Core none); beyond that, minutes are $0.12 USD or C$0.15 each, paid from a prepaid Aura balance. | Sona is an add-on for all Quo plans. Every plan includes 1,000 free credits (about 10 calls) a month. Paid tiers run from $25 to $199 USD per month, with overage from $1.00 down to $0.45 per call.[2][3] |
| PBX and desk-phone support | Yes. Full cloud PBX (ring groups, call queues, IVR menus). Yealink and Polycom desk phones are auto-provisioned, and any SIP-compatible phone works, as do the Pulse mobile apps. | Runs on desktop, web and mobile apps; Quo says you do not need a desk phone. Desk-phone support: not published.[5][6] |
| Business SMS / 10DLC | Yes. Nova Pro and Ultra include SMS/MMS. Flare is a dedicated business texting product, and all Flare plans include basic 10DLC compliance. | Calling and messaging to US and Canadian numbers is included on all plans, subject to fair use. Texting requires business registration with The Campaign Registry: a $19.50 USD one-time carrier review fee and a $1.50 to $3 monthly messaging fee.[2] |
| Canadian billing (CAD) and data residency | Prices in CAD or USD. Call recordings and voicemail are stored in Canada if you are billed in CAD, or in the US if you are billed in USD. Cross-border data flows are listed in our privacy policy. | All prices in USD; no CAD. Canadian numbers are available. Data residency by country: not published.[2][4] |
| Free trial | 14-day trial on Nova Pro and Flare Pro. | 7-day free trial; cancel anytime, with a reminder before it ends.[2] |
| Contract terms | No long-term contracts. All plans are month-to-month. Annual plans offer discounts but are still cancel-anytime. | Monthly or annual billing; on cancellation the plan stays active to the end of the billing cycle. Contract length: not published.[2] |
"Not published" means we did not find the fact on the pages listed under Sources. It does not mean the feature is missing.
Sources, checked 21 October 2026
- Quo homepage (openphone.com redirects here): https://www.quo.com/
- Quo pricing: https://www.quo.com/pricing
- Quo Sona AI agent: https://www.quo.com/sona
- Quo support: phone numbers: https://support.quo.com/core-concepts/phone-numbers/overview
- Quo virtual phone system: https://www.quo.com/product/virtual-phone-system
- Quo support: install apps: https://support.quo.com/getting-started/install-apps
Where Quo fits better
Quo’s Starter plan is $15 USD per user per month when billed annually, and it is built around shared calling and texting for small teams that do not need desk phones or a full PBX.
Quo prices its AI agent per call rather than per minute, which can cost less if your AI-handled calls run long. It also publishes a phone number you can call to try its AI agent.
If you want an AI voice agent built into your phone system, prices in CAD or USD, and call recordings and voicemail stored in Canada when you are billed in CAD, SIPSTACK is built for that.
Try SIPSTACK for yourself
14-day trial on Nova Pro and Flare Pro. No long-term contracts.
No long-term contract
14-Day free trial
Dialpad, Aircall, Quo and OpenPhone are trademarks of their respective owners. SIPSTACK is not affiliated with, sponsored by or endorsed by them. Competitor details come from their public websites on the date shown and may have changed since. Prices exclude taxes and regulatory fees.