ISP software comparison: Inerxia, Sonar and Splynx They keep the record. We run the shift.
In short: Sonar and Splynx are systems of record. Inerxia is a system of record plus AI agents that do the inbound work and an intelligence layer that reads every call.
Sonar and Splynx are good systems of record, and this page says so plainly. But a system of record does not answer the phone at 9 PM, does not negotiate a payment plan, and cannot tell you what nine hundred calls last month were actually about. That work still lands on your team.
The real question
You are not choosing a billing system. You are choosing how much of the work stays manual.
Every vendor in this category sells the same seven boxes: billing, CRM, ticketing, inventory, dispatch, network, reports. Assume they all do those competently, because broadly they do. The comparison that actually changes your headcount is the one nobody puts on a feature grid.
A system of record
Holds the truth about your subscribers. Invoices, tickets, equipment, IPs. It records what happened after a person did it.
Sonar · Splynx · Inerxia
A workforce
Does the work itself. Answers the inbound call, authenticates the subscriber, resolves the case, sends the payment link, escalates with context.
Inerxia
An intelligence layer
Reads what the work produced. Scores every call, clusters the issues, maps contacts to service zones, finds the fault before the tenth report.
Inerxia
Both competitors are excellent at the first box. Neither ships the second or the third. That is not a criticism of their engineering — it is a description of the category they chose. If your constraint is that your records are a mess, buy a system of record. If your constraint is that ten people are answering the same thirty questions, a better database will not move it.
Feature comparison
Line by line.
The top three groups are where everyone competes. The bottom three are where the categories separate.
| Capability | Splynx | Sonar | Inerxia |
|---|---|---|---|
| System of record | |||
| Recurring and prepaid billing | Included | Included | Included |
| Tax and regulatory surchargesSales tax, USF, E911 | Partial or via a partner | Included | Included |
| Subscriber, contract and account records | Included | Included | Included |
| Ticketing with SLA and escalation | Included | Included | Included |
| Inventory and purchase orders | Included | Included | Included |
| Field scheduling and dispatch | Included | Included | Included |
| Accounting syncQuickBooks, Xero and similar | Included | Included | Included |
| Custom report builder | Included | Included | Included |
| Network and provisioning | |||
| RADIUS authentication | Included | Included | Included |
| TR-069 ACS for CPE management | Included | Partial or via a partner | Included |
| OLT / GPON turn-up | Included | Included | Included |
| IPAM and network monitoring | Included | Included | Partial or via a partner |
| Deep WISP toolingQoE shaping, config backups, change control | Included | Partial or via a partner | Partial or via a partner |
| Payments and collections | |||
| Multiple payment channelsInerxia: through your existing processor | Included | Included | Partial or via a partner |
| Embedded payments owned by the vendorOne contract, one reconciliation path | Partial or via a partner | Included | Not offered |
| Payment link sent inside the conversationYour payment link, sent by the agent in the SMS thread or on the call | Not offered | Not offered | Included |
| Agent negotiates a payment plan autonomously | Not offered | Not offered | Included |
| The work itself | |||
| Outbound notifications and mass messagingOutage alerts, dunning reminders | Included | Included | Included |
| AI agent answers inbound voice end to end | Not offered | Not offered | Included |
| AI agent resolves inbound text and chat | Not offered | Not offered | Included |
| Escalation to a human with full context | Not offered | Not offered | Included |
| Churn scoring with proactive intervention | Not offered | Not offered | Included |
| Managed operation billed on outcomesNot seats, not hours | Not offered | Not offered | Included |
| Subscriber intelligence | |||
| Transcription of every call | Not offered | Not offered | Included |
| QA score on 100% of calls | Not offered | Not offered | Included |
| Issue clustering and root cause from transcripts | Not offered | Not offered | Included |
| Contacts correlated to service locationSector faults surfaced before the tickets | Not offered | Partial or via a partner | Included |
| Live outage triage from inbound contacts | Not offered | Partial or via a partner | Included |
| Detection of issues raised on calls that never became tickets | Not offered | Not offered | Included |
| Company and track record | |||
| Purpose-built for ISPs since 2015 | Included | Included | Partial or via a partner |
| Large US and Canada installed baseSonar publishes 385+ providers | Partial or via a partner | Included | Partial or via a partner |
| Global footprint outside North AmericaSplynx publishes 1,000+ ISPs worldwide | Included | Partial or via a partner | Included |
| BEAD and grant reporting tooling | Not offered | Included | Partial or via a partner |
| Published M&A consolidation playbook | Partial or via a partner | Included | Partial or via a partner |
Compiled from each vendor’s public product documentation and marketing pages, current as of this page’s last revision. Competitor products change; if you believe a row is out of date, tell us and we will correct it. Nothing here is a quote of a competitor’s pricing or a claim about their internal roadmap.
The gap
Three things a system of record structurally cannot do.
Not because the vendors are behind, but because doing them means owning the conversation, not just the row that records it.
A ticket is not a resolution.
Both competitors will create the ticket, route it, escalate it and report on it. A person still has to work it. When seventy percent of your queue is the same thirty repetitive cases, better ticket routing improves the accounting of the problem, not the problem. Our agents close those cases end to end and hand a human only what actually needs one.
L1 is most of the queue and the cheapest work your most expensive people do
A dashboard reports rows, not conversations.
Every platform here has excellent reporting over structured data — invoices, tickets, aging, uptime. None of them read the call. So the ten subscribers describing the same sector fault stay ten unrelated tickets, and the churn signal a customer said out loud on Tuesday never becomes a number anywhere.
Around 980 calls a month, on a phone system nobody analyzes
A payment portal still waits for the customer to come to you.
sonarPay is a genuinely good embedded processor and we do not pretend otherwise; Inerxia does not process payments at all. But a portal still assumes someone logs in. Our collections agent starts the conversation, explains the balance, offers a split it is authorized to offer and sends your own payment link in the thread — and the platform restores service when your processor confirms the payment.
Reminder, plan negotiation and payment link in one thread
Switching
You do not have to rip anything out to start.
The most common way operators begin with us is not a migration at all. Intelligence reads the phone system and help desk you already run, so you can see what it finds before you move a single subscriber record.
- 1.
Start with Intelligence
Keep Sonar or Splynx as your system of record. We read the calls and tickets they generate and hand back the clusters, the QA scores and the faults nobody mapped.
- 2.
Add agents to the queue
Point inbound voice and SMS at our agents for the repetitive cases only. Your team keeps everything else, and you measure the deflection against your own numbers.
- 3.
Automate collections
Let the collections agent send reminders and your existing payment links for one cycle. Compare the collection curve before you decide anything.
- 4.
Then, if it makes sense, the record
Migration is four weeks to your first full cycle, with a parallel run before go-live. Nothing cuts over until the parallel cycle matches yours.
Keep reading.
- ComparisonSonar alternativeInerxia vs Sonar: where Sonar is stronger, what Inerxia adds, and how switching works.
- ComparisonSplynx alternativeInerxia vs Splynx: where Splynx is stronger, what Inerxia adds, and how switching works.
- ComparisonPowercode alternativeInerxia vs Powercode: where Powercode is stronger, what Inerxia adds, and how switching works.
- ComparisonVisp alternativeInerxia vs Visp: where Visp is stronger, what Inerxia adds, and how switching works.
- GuideISP billing software buyer's guideWhat ISP billing software should handle, when spreadsheets stop working, fiber vs WISP needs, how to evaluate vendors and what migration should look like.
- PricingInerxia pricingHow each product is priced, and what is included with every deployment.
Comparing ISP platforms.
Is Inerxia a Sonar alternative?
Yes. Inerxia replaces Sonar as the system of record — billing with sales tax, USF and E911, subscriber and contract records, ticketing, inventory, and RADIUS, TR-069 and OLT/GPON provisioning — and adds AI agents that answer inbound calls and texts, payment reminders with your own payment links and QA scoring on every call. You can also keep Sonar and start with Intelligence on top of it.
Is Inerxia a Splynx alternative?
Yes. Inerxia covers the same system-of-record ground as Splynx — billing, subscriber records, ticketing, inventory, RADIUS, TR-069 and OLT/GPON provisioning — and adds agents that resolve inbound voice and text end to end, collections reminders and payment plans inside the conversation and analysis of every call. Operators can also keep Splynx and add Inerxia's agents or Intelligence first.
What does Sonar do better?
Sonar has deeper US grant and BEAD reporting tooling, a larger published North American installed base (Sonar publishes 385+ providers) and a published M&A consolidation playbook. If BEAD and grant reporting is your main constraint, Sonar may be the better fit, and we will say so on the call.
What does Splynx do better?
Splynx has deeper packet-level network tooling for wireless operators — QoE shaping, config backups and change control — fuller IPAM and network monitoring, and a wider international footprint (Splynx publishes 1,000+ ISPs worldwide). WISPs whose main need is network tooling may be better served by Splynx.
Can we migrate from Sonar or Splynx?
Yes. Subscribers, contracts, balances and equipment are migrated and verified against your live base, then one full billing cycle runs in parallel with your current system; nothing cuts over until it matches. It takes four weeks to your first full cycle, with migration, training and support included. Many operators start without migrating at all.
Bring the vendor shortlist. We will go through it with you.
Thirty minutes, your own numbers, and a straight answer about where we fit and where we do not. If Sonar or Splynx is the better call for your situation, we will tell you on the call rather than after the implementation.