Comparison of server monitoring approaches. Evaluate self-hosted and hosted editions separately against your service checks, alerting and operating requirements.
Stuart Kerr Spindlow has confirmed prior experience with the software covered by Happy SysAdm. This comparison’s plan-specific recommendations are editorial analysis of documentation reviewed on 23 September 2026, not a claim that every named plan or current release was personally tested. Calculations and AI-run checks are identified separately.The shortlist
| Product & fit | Documented scope | Limits to evaluate | Cost basis |
|---|---|---|---|
 Teams able to operate and tune their own monitoring Visit Zabbix | Open-source monitoring with configurable collection and alerting. | Requires ownership of deployment, upgrades, templates, database growth and alert design. | No monitoring software licence fee; budget hosting, staff time and optional professional support. |
 Teams preferring a commercial sensor-based platform Visit Paessler PRTG | Predefined sensors with self-hosted and hosted product choices. | A device can consume many sensors; hosted and self-hosted editions have different limits. | Sensor-based subscription; Network Monitor has a 100-sensor freeware edition, not Hosted Monitor. |
Zabbix
Best fit: Teams able to operate and tune their own monitoring.
Open-source monitoring with configurable collection and alerting. Requires ownership of deployment, upgrades, templates, database growth and alert design.
Cost considerations: No monitoring software licence fee; budget hosting, staff time and optional professional support.
Visit ZabbixPaessler PRTG
Best fit: Teams preferring a commercial sensor-based platform.
Predefined sensors with self-hosted and hosted product choices. A device can consume many sensors; hosted and self-hosted editions have different limits.
Cost considerations: Sensor-based subscription; Network Monitor has a 100-sensor freeware edition, not Hosted Monitor.
Visit Paessler PRTGChoose the operating model
Compare self-hosted Zabbix with self-hosted PRTG Network Monitor for the same server and service checks. PRTG Hosted Monitor changes the hosting responsibility and pricing, so its offer belongs in a separate comparison. For a Windows-oriented team preferring defined sensors and a commercial product, PRTG is the more natural first evaluation. For a team already comfortable owning the monitoring server, database and templates, Zabbix is the stronger fit.
The assessment concerns operating responsibility and licensing, not a measured setup-time advantage. Zabbix’s flexible collection can reduce dependence on fixed sensor packaging, but someone must maintain it. PRTG’s sensor catalogue does not remove the need to configure meaningful thresholds and incident routing.
Who should avoid each option
Use these exclusions alongside the shortlist and the plan-specific analysis. A requirement that the selected edition cannot meet rules it out even if its headline price is attractive.
| Option | Avoid this option when | Better alternative or qualifying tier | Reason |
|---|---|---|---|
| PRTG Network Monitor | You need more checks than the chosen sensor tier allows | A qualifying paid PRTG tier or Zabbix with an operating owner | Sensors are individual checks, not a device entitlement |
| Zabbix | Nobody can own deployment, upgrades, database growth and alert tuning | PRTG when a commercial sensor-based operating model fits | No per-sensor licence fee does not remove infrastructure and staff effort |
Size the same monitoring coverage
Consider 25 devices requiring eight sensors each in a stated planning example: 25 × 8 = 200 sensors. PRTG Network Monitor’s documented 100-sensor freeware allowance cannot cover that requirement. PRTG 500 would leave 300 sensors of nominal licence headroom if those eight sensors fully cover each device; additional application checks consume part of it.
Zabbix has no per-sensor software licence fee. That does not mean unlimited practical capacity: collection frequency, history, database size and hardware still constrain the deployment. Paessler’s separate sizing guidance also makes clear that complex sensor types can demand more resources than simple checks.
| Equal-coverage scenario | PRTG Network Monitor | Zabbix |
|---|---|---|
| 25 devices × 8 planned checks | 200 sensors; above freeware allowance | 200 planned checks to configure and size |
| Software licensing implication | A paid sensor tier is required for this scenario | No per-sensor software licence charge |
| Operating cost still to budget | Host, administration and chosen subscription | Host, database, administration and optional support |
Translate sampling into retained volume
For a simple example of 200 single-valued metrics sampled every 60 seconds, 200 × 1,440 = 288,000 values arrive each day, or 8,640,000 over 30 days. This is a count of values from explicit assumptions, not a storage benchmark. A PRTG sensor can have multiple channels, so 200 sensors need not equal 200 values per interval.
Database records, indexes, compression, aggregation and retention determine disk use. It would be misleading to turn that value count directly into a guaranteed storage size or to compare a one-minute history on one product with five-minute aggregates on the other. No equivalent infrastructure and workload test establishes a faster platform here.
Which one to choose
Choose PRTG when its sensor model and commercial operating relationship fit the team and the paid tier covers the whole monitoring brief. Choose Zabbix when the team can own its stack and flexible, licence-free collection is the stronger requirement. For a genuinely small scope within 100 sensors, PRTG freeware deserves consideration; it is not a 100-device entitlement.
The material unresolved comparison is staff effort to sustain useful alerts and retained history under the same workload. Until that is measured, neither a licence price nor a polished dashboard establishes lower total operating cost. A service check that detects a real failure is more valuable than extra counters nobody uses.