Nextiva is UCaaS + CX platform over softphone. Kelir is UCaaS over cellular.
Nextiva positions as UCaaS + customer-experience tooling — adding survey, sentiment, and CX-workflow tools alongside the standard UCaaS feature surface. Comparable routing depth to Kelir; different delivery (softphone vs cellular eSIM) and different scope (CX-platform vs focused UCaaS).
Nextiva positions itself as UCaaS + customer-experience platform — adding tools like survey collection, sentiment analysis, customer-journey workflows alongside the standard UCaaS surface (auto-attendant, IVR, hunt groups, recording, analytics). For the routing primitives, Nextiva and Kelir are comparable. The differences: Nextiva's CX layer adds genuine value if you're building a full customer-experience-platform deployment; Kelir is a focused UCaaS phone system without the CX-platform overhead. Delivery is softphone for Nextiva, cellular eSIM for Kelir. Choose Nextiva if CX-platform consolidation is the main business case; choose Kelir if you want focused UCaaS routing on real cellular delivery.
How they compare.
| Compared | Nextiva | Kelir |
|---|---|---|
| Delivery model | ||
| Voice transport | Softphone (Wi-Fi / mobile data) | Cellular VoLTE |
| Where the call rings | Nextiva app | Native dialer |
| App must be open | Yes | No |
| Works without internet | ||
| 2FA SMS reliable | Limited (virtual) | |
| UCaaS routing | ||
| Auto-attendant | ||
| Multi-level IVR | 2–4 levels by tier | |
| Hunt groups | ||
| Departments | ||
| Call queuing | ||
| Customer experience platform | ||
| Customer surveys | ||
| Sentiment analysis | ||
| Customer journey workflows | ||
| Built-in CRM (NextOS) | Connect external (HubSpot/SF/PD) | |
| Voicemail & analytics | ||
| Voicemail transcripts | Every plan | |
| Call recording | ||
| Configurable retention | Higher tier | Up to 7y on Pro |
| Per-user / per-dept analytics | Team plans | |
| Built-in video conferencing | ||
| Compliance | ||
| SOC 2 Type II | Roadmap | |
| HIPAA BAA | Roadmap | |
| US data residency | ||
| E911 enabled | ||
Nextiva information sourced from www.nextiva.com on 2026-05-05. Plans and prices change; check the source for the current state.
- Customer-experience platform tooling — surveys, sentiment, customer-journey workflows alongside the UCaaS deployment.
- Mid-market UCaaS deployments with CX-led customer-experience programs.
- Strong customer-service reputation in the SMB UCaaS category.
- Built-in video and team-messaging in the UCaaS bundle.
- NextOS unified-platform interface — voice + CX in one admin surface.
- Real cellular delivery — UCaaS routing on cellular eSIM, not softphone.
- 2FA SMS reliability — every line is a real US cellular number.
- Mobile-first / field-based teams — CarPlay, lock-screen rings, native dialer.
- Focused UCaaS scope — no CX-platform overhead for teams that just want a phone system.
- Lower per-seat cost at the entry tier ($24.99 Solo, $29.99 Team Starter).
- Faster time-to-deploy for 2–50 seat SMB use cases.
Side-by-side, USD.
- DigitalDigital channels — chat, social, SMS~$25/seatper month, USD
- CoreVoice + video + SMS, basic IVR~$36/seatper month, USD
- EngageAdds CX-platform tools, advanced analytics~$50/seatper month, USD
- Power SuiteFull CX platform with AI workflows~$75/seatper month, USD
- SoloSingle-user UCaaS surface$24.99per month, USD
- Team StarterMulti-user PBX, 2–50 seats$29.99per seat / month
- Team ProCRM, analytics, audit log, retention$39.99per seat / month
Who should pick which?
You're building a customer-experience platform — UCaaS + surveys + sentiment + journey workflows on one stack. Or you need NextOS's unified UCaaS + built-in CRM in a single admin surface.
You're a 2–50 person team that wants focused UCaaS routing without the CX-platform overhead. Real cellular delivery matters for mobile / field reliability. You'd rather connect a best-of-breed CRM (HubSpot, Salesforce, Pipedrive) than use a built-in CRM.
Nextiva is UCaaS + customer-experience platform — broader product scope, mid-market positioning, softphone delivery. Kelir is focused UCaaS-on-cellular — narrower scope, SMB / lower-mid-market positioning, cellular eSIM delivery. If CX-platform consolidation is the main business case, Nextiva. If a phone system that works reliably on mobile / field-based work is the main business case, Kelir.
Common questions
It is if you're running a customer-experience program — closing the loop on customer surveys, tracking sentiment, building cross-channel journey workflows. Nextiva's CX-platform layer has genuine value for teams that have invested in that operating model. For teams that just want a phone system, the CX layer adds cost and complexity without proportional benefit.
Nextiva includes a basic CRM in their unified NextOS platform. Useful for teams that don't have a separate CRM and want everything in one tool. For teams already on HubSpot, Salesforce, or Pipedrive, NextOS becomes redundant — and Kelir's external CRM integrations on Team Pro are likely a better fit (use the CRM you already pay for, integrate it with the phone system).
Same as the other UCaaS comparisons — calls don't drop because the softphone got suspended or Wi-Fi handed off badly, the line rings on the native dialer over VoLTE, 2FA SMS works because every line is a real US cellular number. For mobile-first / field-based teams, this is the operational difference; for desk-bound teams with reliable Wi-Fi, the difference is smaller.
Nextiva Core ~$36/seat vs Kelir Team Starter $29.99/seat — Kelir cheaper at entry. Nextiva Engage ~$50/seat vs Kelir Team Pro $39.99/seat — Kelir cheaper at the upper-mid tier. Nextiva Power Suite ~$75/seat is in CX-platform territory Kelir doesn't compete in. Pure UCaaS cost comparison favors Kelir; Nextiva's premium pricing reflects the CX-platform scope.
Yes. Same migration playbook as the other UCaaS competitors — 1–2 weeks for a 5–25 seat team. Number porting via FCC, configuration rebuild on Kelir surfaces, CRM reconnection. See /use-cases/migrating-from-ringcentral for the structurally-identical playbook.
No. Kelir is voice + SMS focused — calls, IVR, hunt groups, departments, voicemail, two-way SMS/MMS. Video and team chat are intentionally out of scope; pair Kelir with Zoom or Google Meet for video and Slack or Microsoft Teams for chat. Most of our customers already use those tools and don't want them tied to the phone vendor.