Choosing an ISP billing platform is a long-term commitment — it's your subscriber database, your revenue and your RADIUS core. We compared the seven platforms operators ask about most: ISP Boost, Splynx, Sonar, DMASoftlab Radius Manager, Aradial, SAS Radius and Zal Pro ISP CRM (with a nod to ISPBills). Here's a fair breakdown.
Every network is different. This is a starting point compiled from public information in June 2026 — always verify current pricing and features with each vendor before deciding.
At a glance
| Platform | Free tier | Hosting | Full business suite | Best for |
|---|---|---|---|---|
| ISP Boost | ✓ 50 users | Self-hosted | ✓ All-in-one | All-in-one, free start |
| Splynx | ✗ | Cloud / on-prem | Modules | Established vendor |
| Sonar | ✗ | Cloud (SaaS) | ✓ | Larger US ISPs |
| DMASoftlab Radius Manager | ✗ | Self-hosted | ✗ | Classic RADIUS billing |
| Aradial | ✗ | Self-hosted / carrier | Carrier AAA | Carrier-grade AAA |
| SAS Radius / SAS4 | ✗ | Self-hosted | ✗ | Existing SAS users |
| Zal Pro ISP CRM | ✗ | Self-hosted | CRM-focused | CRM-first workflows |
1. ISP Boost — best all-in-one, free to start
ISP Boost runs a production FreeRADIUS 3.2 engine with a modern Angular panel and bundles the entire back office — billing, CRM, multi-level resellers, cards/vouchers, helpdesk, inventory, HR, assets, alerts and reports. It's free for 50 users, self-hosted on any cloud or bare metal, and installs with one command. It also imports SAS4 in one click. If you want everything in one place without per-user fees, start here.
2. Splynx — established commercial platform
Splynx is mature and widely deployed, with cloud and on-prem options and a module marketplace. Pricing is subscription-based and scales with your customer count. A strong choice if you prefer a large vendor and don't mind ongoing per-customer costs. Full ISP Boost vs Splynx comparison →
3. Sonar — SaaS for larger ISPs
Sonar is a cloud-hosted (SaaS) platform popular with mid-to-large ISPs, especially in North America, with strong billing and network inventory. It's a polished product, but it's cloud-only and priced accordingly — less suited to operators who want to self-host or start free.
4. DMASoftlab Radius Manager — the classic
Radius Manager helped make affordable RADIUS billing mainstream. It's proven and self-hosted, but it's a classic PHP app without the wider business suite. Full ISP Boost vs Radius Manager comparison →
5. Aradial — carrier-grade AAA
Aradial is a long-established RADIUS/AAA vendor aimed at carriers and larger service providers, with deep protocol support and scalability. It's powerful but enterprise-priced and more infrastructure than all-in-one ISP management.
6. SAS Radius / SAS4 — for existing users
SAS Radius (SAS4) has a big installed base and does core RADIUS billing well, but the stack and UI are dated and there's no bundled CRM/helpdesk. If you're already on it, ISP Boost's one-click importer makes leaving painless. Full ISP Boost vs SAS Radius comparison →
7. Zal Pro ISP CRM — CRM-first
Zal Pro ISP CRM focuses on the customer-relationship side of running an ISP. If CRM is your priority it's worth a look, though it's self-hosted and commercial without a free tier. ISP Boost covers CRM and RADIUS billing and the rest of the back office in one panel.
How to pick
- Want everything included and a free start? ISP Boost.
- Prefer a big SaaS vendor and don't self-host? Sonar or Splynx.
- Carrier-scale AAA? Aradial.
- Leaving SAS4 or Radius Manager? ISP Boost, with one-click migration.
The best platform is the one that runs your whole ISP without three other tools bolted on. That's the gap ISP Boost was built to close.
