Quo vs Sideline (2026): which should you pick?

Pick Quo if

• Fits if you want a work number on your own phone, apart from your personal one
• Works for a few people sharing one sales or support line who need the same history

Look elsewhere if

• Tight if you're on Starter and want a phone menu or call transfers, as those need Business
• Not for you if you call abroad a lot, since calls outside the US and Canada are billed per minute
• Pricey if Sona answers lots of calls, as each one past the plan's credits costs $0.45 to $1.00
• Watch out: US texting needs carrier registration, $19.50 once plus $1.50 to $3 a month
• Pricey if you pay monthly, at $19 for Starter and $33 for Business, or need extra numbers at $5 each

Pick Sideline if

• Fits if you want a second number for selling things or dating without giving out your own
• Works for one person who wants calls to run over the carrier, not wifi

Look elsewhere if

• Not for you if you need a team phone system, since no multi-user plan is shown
• Skip it if you want a stated price from the vendor, as the site shows none
• Pricey if you pay monthly: $14.49 against $129.99 for the year
• Watch out: the App Store lists plans with no billing period, and a Google Play review mentions $9.99
• Watch out: there is no free plan or trial

Quo

• Texting US numbers requires carrier registration (TCR): a one-time $19.50 review fee plus $1.50 to $3 a month.
• On Starter, calls are recorded manually only, and phone menus, transfers and CRM integrations need Business or Scale.
• Each extra number costs $5 a month; calls and texts outside the US and Canada are billed per minute or per message.
• Sona calls beyond the plan's credits cost $0.45 to $1.00 each, depending on the credit tier.

Sideline

• Only iOS and Android apps are listed; the site pages read for this entry show no team or multi-user plan.
• The App Store shows several in-app purchases without a billing period, so the plan names are the only guide to monthly or yearly.
• The vendor's own site states no price; amounts come from the App Store listing for the US.
• A user review on Google Play mentions $9.99 a month, which differs from the App Store figures.

Quo

Shared phone numbers

Several teammates can share one number with a common call and text history, internal threads and shared contacts. Starter allows up to 10 users per shared number.

Calling and texting

Unlimited calls and texts to US and Canadian numbers under a fair use policy, with snippets, scheduled messages, auto-replies and group messages.

Sona AI agent

An AI agent that answers calls at any hour. Every plan includes 1,000 credits a month, enough for 10 calls; credit packs run from $25 to $199 a month.

AI call summaries and transcripts

Business and Scale transcribe and summarize every call. On Starter, summaries cover only calls Sona handles; voicemails are transcribed on all plans.

Phone menus and routing

Business adds phone menus, call transfers, group calls and ring orders that ring teammates in batches, plus business-hours forwarding.

Integrations and API

HubSpot and Salesforce need Business or Scale. Pipedrive, Slack, Zapier, Make, Google Contacts and the Quo API are also listed, plus an MCP server for ChatGPT and Claude.

Sideline

Second number

Pick a number in the area code you want, or port in a number you already have, and use it beside your main line.

Carrier network calls

Calls use the carrier's cellular network instead of VoIP, so the line works without Wi-Fi, according to the site.

Unlimited messaging

SMS, MMS and group messages are unlimited, with an auto-reply that can send a text back after a missed call or message.

Separate voicemail

Record a greeting for the Sideline number so callers reach its own voicemail instead of your personal one.

Spam labeling

The app suggests names for unknown callers and texters and labels suspected spam, telemarketers and fraud.

No ID to sign up

The Google Play listing says an account does not need a government-issued ID and is verified in another way.

Quo

• Starter$15

  per user / month, billed annually ($19 billed monthly)

  One local or toll-free number per user, unlimited US and Canada calls and texts, voicemail transcripts, the Sona AI agent and the Quo API.

• Business$23

  per user / month, billed annually ($33 billed monthly)

  Adds AI summaries and transcripts for all calls, phone menus, group calls, transfers, ring orders, auto recording, reports and HubSpot and Salesforce.

• Scale$35

  per user / month, billed annually ($47 billed monthly)

  Adds AI call tags, dedicated onboarding, priority chat and email support, and inbound phone support.

Sideline

• Monthly plan$14.49

  as labeled in the App Store; billing period not shown

  In-app purchase listed as Sideline - Monthly plan. The listing also shows Sideline Pro - Monthly at $14.99 and Voicemail to Text at $2.99.

• Yearly plan$129.99

  as labeled in the App Store; billing period not shown

  In-app purchase listed as Sideline - Yearly Plan. The same listing shows older or smaller purchases, from $0.99 to $99.00.

Quo

• Annual discount

  Lower prices with yearly billing

  Quo's pricing page shows yearly billing saving $48 a year per user on Starter, $120 on Business and $144 on Scale.

Sideline

No public discounts listed.