How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- Datadog is the best cloud-native pick, with infrastructure, logs, traces, and security in one platform.
- LogicMonitor is the best hybrid pick, with auto-discovery across on-prem, network, storage, and cloud.
- Zabbix is the best free pick, with enterprise-scale open-source monitoring and no license fees.
- Nagios XI is the best cost-predictable pick, with fixed per-node licensing that does not grow with data volume.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Datadog | Cloud-native teams | $15/host/month | No |
 Dynatrace | Enterprise AI ops | $29/host/month | No |
 New Relic | APM-led teams | Free | Yes |
 LogicMonitor | Hybrid infrastructure | $16/hybrid unit/month | No |
 Zabbix | Free enterprise scale | Free | Yes |
 Nagios XI | Predictable costs | $2,495 | No |
 PRTG | Sensor-based networks | Free | Yes |
 SolarWinds | Broad IT monitoring | See website | No |
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The best Zenoss alternatives
Starting price$15/host/month
Free planNo
Datadog is the cloud-native pick. Its homepage presents an AI-powered monitoring and security platform for cloud applications, with full-stack observability across infrastructure, log management, APM, security, network monitoring, synthetic monitoring, real user monitoring, and serverless, plus Bits AI agents that chat, investigate, and remediate issues. It is the broadest platform here, and the natural choice for teams already running cloud-native stacks.
Published comparisons list Infrastructure Pro from $15 a host a month on annual billing, with a free trial but no free tier. The trade-off is cost discipline: logs bill by volume and custom metrics multiply with high-cardinality tags, so ship only what you will query and set a cardinality policy before your first deploy. For cloud-first teams that want one platform, Datadog is the best Zenoss alternative here.
What we like- Full-stack observability
- Infrastructure, logs, APM, security, and network monitoring in one place
- AI agents for investigation
Watch out for- Bills can grow fast with logs and custom metrics
- Needs cost controls from day one
Starting price$29/host/month
Free planNo
Dynatrace is the enterprise AI ops pick. Its homepage presents observability built for the age of AI, with AI observability, application observability, application security, business observability, digital experience, infrastructure observability, log analytics, software delivery, and threat observability, plus a unified data lakehouse and agentic operations. It was named a Leader in the 2026 Gartner Magic Quadrant for Observability Platforms.
Published comparisons list infrastructure observability from $29 a host a month, or about $0.04 a host an hour, with full-stack observability from $58 for an 8-GiB host. The trade-off is price: Dynatrace is the premium pick here, and full-stack coverage costs roughly double infrastructure alone. For large enterprises that want AI-driven root cause without stitching tools together, Dynatrace is the best pick here.
What we like- AI-powered root cause with causal analysis
- Auto-discovery
- Unified data lakehouse
- 15-day trial
Watch out for- Premium pricing
- Full-stack pricing runs much higher than infrastructure alone
Starting priceFree
Free planYes
New Relic is the APM-led pick. Its homepage presents observability that thinks, acts, knows, predicts, and protects, with application performance monitoring, digital experience monitoring, AI and agentic monitoring, infrastructure monitoring, logs, and security in one platform, plus 800-plus pre-built integrations and full platform access for free with no credit card required. Its infrastructure monitoring promises full hybrid visibility with infrastructure health tied to applications.
Published comparisons list a free tier with 100 GB of data ingest and one user, with paid pricing per user plus per gigabyte ingested. The trade-off is user costs: teams with many engineers pay more as headcount grows. For application-centric teams that want a free start and one platform, New Relic is the best Zenoss alternative here.
What we like- Free tier with 100 GB data ingest
- 800-plus integrations
- AI agent monitoring
- No credit card to start
Watch out for- Per-user pricing adds up fast
- Log costs need watching at scale
Starting price$16/hybrid unit/month
Free planNo
LogicMonitor is the hybrid pick. Its homepage presents an AI platform for CIOs leading autonomous IT, with one system that detects issues, guides action, and helps teams respond before customers feel the impact, tracking more than 2 trillion metrics daily across 145,000-plus global users, with Edwin AI agents moving teams from noisy signals to governed action and claiming 67 percent ITSM incident reduction and 88 percent noise reduction.
Published comparisons list LM Envision from $16 a hybrid unit a month for Essentials, $27 for Advanced, and $53 for Signature with Edwin AI, with a 15-day trial. The trade-off is the unit: one hybrid unit covers different numbers of resources by type, so estimate your actual device, cloud, and Kubernetes mix before budgeting. For teams managing on-prem, network, storage, and cloud together, LogicMonitor is the best Zenoss alternative here.
What we like- Auto-discovery across hybrid estates
- One hybrid unit for all resource types
- Edwin AI for alert correlation
- 15-day trial
Watch out for- Advanced customization needs specialist effort
- APM depth thinner than Datadog or Dynatrace
#5Zabbix
Best for: Free enterprise scale4.3/5 on
G2 (209 reviews, checked Oct 2026)
Visit zabbix.com
Starting priceFree
Free planYes
Zabbix is the free pick. Its homepage presents the enterprise-class open-source observability solution, with exceptionally low total cost of ownership through predictable fixed support pricing, no license fees, and no per-device charges no matter the size of the environment, plus security by design, scalability, and MSP-friendly multitenant operations. It reports 20 years of experience, a global partner network, and trust from Fortune 500 companies, including monitoring the Columbus lab aboard the International Space Station.
Zabbix On-Premise is completely free as an open-source solution, with a fully managed Zabbix Cloud option for teams that want hosting handled, published from around $50 a month. The trade-off is effort: Zabbix needs Linux skills and setup time that commercial tools reduce, and published guides put enterprise setup at 6 to 8 weeks. For teams with the skills and a tight budget, Zabbix is the best Zenoss alternative here.
What we like- Free open-source platform
- No license or per-device fees
- Single pane for IT and OT
- Managed cloud option
Watch out for- Setup and tuning need Linux skills
- Interface feels dated next to SaaS tools
#6Nagios XI
Best for: Predictable costs4.5/5 on
G2 (58 reviews, checked Oct 2026)
Visit nagios.com
Starting price$2,495
Free planNo
Nagios XI is the cost-predictable pick. Its homepage presents an enterprise IT infrastructure monitoring platform with total control of your data and predictable costs, running on hardware you control including air-gapped and regulated environments, with licensing by node count on terms fixed at purchase, not by metric, sensor, or ingested data volume. Its model is simple: any executable that returns an exit code and a status line works as a check, and it reports more than 2,000 partners delivering solutions to over one million users worldwide.
Published comparisons list Nagios XI from around $2,495 as a perpetual license, with free Nagios Core as the open-source base. The trade-off is age: Nagios is a 25-year-old platform with an older interface and plugin-dependent coverage, and published guides put large deployments at 8 to 12 weeks. For regulated teams that need data control and a bill that does not grow with data volume, Nagios XI is the best Zenoss alternative here.
What we like- Fixed per-node licensing
- Data never leaves your infrastructure
- Air-gapped deployments
- Any executable can be a check
Watch out for- Older interface
- Plugin-dependent coverage
- Needs admin effort
#7PRTG
Best for: Sensor-based networks4.7/5 on
G2 (214 reviews, checked Oct 2026)
Visit paessler.com
Starting priceFree
Free planYes
PRTG is the sensor-based network pick. Its homepage from Paessler presents complete network monitoring with zero blind spots, covering network, servers, cloud, and applications in one tool, with auto-discovery that finds devices and pre-configured sensors that start monitoring immediately, plus unified visibility, proactive alerts, and scaling from one site to twenty without added operational burden. It reports more than 100,000 customers worldwide.
Published comparisons list PRTG free up to 100 sensors, with paid licenses from around $2,149 a year. The trade-off is sensor math: every monitored value is a sensor, so a single switch can consume dozens, and budgets need careful counting. For lean IT teams that want fast setup on networks and servers, PRTG is the best Zenoss alternative here.
What we like- Free up to 100 sensors
- Auto-discovery with pre-configured sensors
- Vendor-agnostic coverage
- 100,000-plus customers
Watch out for- Sensor counting gets complex at scale
- Windows-based core
- Cloud depth thinner than Datadog
Starting priceSee website
Free planNo
SolarWinds is the broad IT pick. Its homepage presents observability, database, and IT service management, with goal-oriented AI that drives outcomes rather than prompt-by-prompt assistance, plus self-hosted, SaaS, or hybrid deployment, database monitoring across SQL Server, Oracle, MySQL, PostgreSQL, MongoDB, Redis, and more, incident response that correlates alerts from 200-plus third-party tools into one incident, and service management with tickets connected to assets and workflows. It reports trust in more than 190 countries.
Pricing is quote-based, so list it as "See website" rather than guessing a figure. The trade-off is weight: SolarWinds is a broad suite, and small teams may find it heavier than PRTG or Zabbix. For IT teams that want monitoring, database tuning, and service management from one vendor, SolarWinds is the best Zenoss alternative here.
What we like- Self-hosted, SaaS, or hybrid deployment
- Database observability across engines
- Goal-oriented AI
- Trusted in 190-plus countries
Watch out for- Quote-based pricing
- Broad suite can feel heavy for small teams
How we chose
We compared these tools on coverage of hybrid infrastructure, auto-discovery, alert quality, AI features, deployment options, pricing model, and free tiers. We opened each vendor's homepage to confirm the product exists today and matches its description, and we used published comparison guides where homepage pricing was not shown. We did not claim hands-on testing. Zenoss itself is an infrastructure monitoring platform for hybrid IT, so the strongest alternatives here are the ones that cover on-prem and cloud together rather than cloud-only tools.
What to verify in a trial
Start by counting your real bill: model your hosts, hybrid units, sensors, or nodes against each pricing scheme before buying, since the cheapest headline price is rarely the cheapest total. Next, test auto-discovery on your actual estate, since device coverage varies by vendor. Finally, set log retention and cardinality policies on day one, since log volume is the most common budget surprise across Datadog, New Relic, and Dynatrace.
Frequently asked questions
What is Zenoss?
Zenoss is an infrastructure monitoring platform for hybrid IT environments, covering servers, networks, storage, and cloud resources with service modeling and event management. Teams leave it for cloud-native depth, free open-source options, or simpler pricing.
Which Zenoss alternative is free?
Zabbix is free and open-source with no license or per-device fees, PRTG is free up to 100 sensors, and New Relic offers a free tier with 100 GB of data ingest. Datadog, Dynatrace, LogicMonitor, and Nagios XI offer trials but no free tier.
Which is best for hybrid infrastructure?
LogicMonitor, with auto-discovery across on-prem, network, storage, virtualization, and cloud in one hybrid unit model, is the best hybrid pick. Zabbix and SolarWinds also cover hybrid estates well.
Which is best for cloud-native teams?
Datadog, with infrastructure, logs, traces, security, and network monitoring in one platform, is the best cloud-native pick. Dynatrace suits enterprises that want AI-driven root cause.
Why is monitoring pricing so hard to compare?
Vendors meter differently: Datadog per host, LogicMonitor per hybrid unit, PRTG per sensor, Nagios per node, and New Relic per user plus data volume. Model your actual estate against each scheme before buying.
Should I self-host or use SaaS monitoring?
Self-hosting with Zabbix or Nagios XI keeps data in-house and costs predictable, but needs admin time. SaaS tools like Datadog, Dynatrace, and LogicMonitor set up faster but bill by volume and host count.
Sources we checked (8)
- https://www.datadoghq.com
- https://www.dynatrace.com
- https://newrelic.com
- https://www.logicmonitor.com
- https://www.zabbix.com
- https://www.nagios.com
- https://www.paessler.com
- https://www.solarwinds.com
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.