App comparison
Add up to 4 apps below to see how they compare. You can also use the "Compare" buttons while browsing.
GetApp offers objective, independent research and verified user reviews. We may earn a referral fee when you visit a vendor through our links.
Our commitment
Independent research methodology
Our researchers use a mix of verified reviews, independent research, and objective methodologies to bring you selection and ranking information you can trust. While we may earn a referral fee when you visit a provider through our links or speak to an advisor, this has no influence on our research or methodology.
Verified user reviews
GetApp maintains a proprietary database of millions of in-depth, verified user reviews across thousands of products in hundreds of software categories. Our data scientists apply advanced modeling techniques to identify key insights about products based on those reviews. We may also share aggregated ratings and select excerpts from those reviews throughout our site.
Our human moderators verify that reviewers are real people and that reviews are authentic. They use leading tech to analyze text quality and to detect plagiarism and generative AI.
How GetApp ensures transparency
GetApp lists all providers across its website—not just those that pay us—so that users can make informed purchase decisions. GetApp is free for users. Software providers pay us for sponsored profiles to receive web traffic and sales opportunities. Sponsored profiles include a link-out icon that takes users to the provider’s website.
Nagios Core
5
13
4
13
3
7
2
1
1
0
Based on GetApp‘s extensive, proprietary database of in-depth, verified user reviews
Open-source IT infrastructure monitoring & alerting solution
Last updated: September 2026
Nagios Core Alternatives & Competitors (2026)
Top 10 free alternatives
ManageEngine NetFlow Analyzer
Extensive network bandwidth monitoring and traffic analysis
0.3
Value for money
Starting price
No pricing info
0.6
Functionality
Bandwidth Monitoring
4.7/5
Activity Monitoring
4.7/5
Alerts/Notifications
4.4/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
ManageEngine OpManager MSP
Redefine multiclient network management with OpManager MSP
0.3
Value for money
No pricing info
Starting price
No pricing info
0.6
Functionality
Alerts/Escalation
4.8/5
Active Directory Integration
4.6/5
Alerts/Notifications
4.6/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
ManageEngine OpManager
Network Monitoring & Management Software
0.2
Value for money
Starting price
No pricing info
0.5
Functionality
Alerts/Escalation
4.7/5
Alerts/Notifications
4.6/5
Access Controls/Permissions
4.4/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
ManageEngine OpUtils
Hassle-free management of IP addresses and switch ports
0.2
Value for money
Starting price
No pricing info
0.4
Functionality
Alerts/Notifications
4.5/5
Bandwidth Monitoring
4.5/5
Alerts/Escalation
4.1/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
NinjaOne
Cloud-based unified IT operations platform for MSPs
0.1
Value for money
No pricing info
Starting price
No pricing info
0.4
Functionality
Activity Tracking
5/5
Alerts/Escalation
4.6/5
Alerts/Notifications
4.4/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
OpManager Nexus
Achieve holistic IT infrastructure monitoring with OpManager
0.1
Value for money
Starting price
No pricing info
0.4
Functionality
Alerts/Notifications
4.6/5
Access Controls/Permissions
4.3/5
Access Controls/Permissions
N/A
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
Site24x7
All-in-one performance monitoring tool for DevOps and IT
Value for money
Starting price
No pricing info
0.5
Functionality
Application Management
5/5
Activity Dashboard
4.9/5
Alerts/Escalation
4.7/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
N-central
On-premise and hosted RMM software for MSPs
0.6
Value for money
Starting price
No pricing info
0.1
Functionality
Alerts/Notifications
4.3/5
Access Controls/Permissions
4.2/5
Active Directory Integration
4/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.4
Value for money
Starting price
No pricing info
0.4
Functionality
Activity Dashboard
5/5
Alerts/Notifications
4.7/5
Alerts/Escalation
4.5/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.2
Value for money
Starting price
No pricing info
0.4
Functionality
Access Controls/Permissions
4.8/5
Anti Virus
4.6/5
Alerts/Notifications
4.5/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.2
Value for money
Starting price
No pricing info
0.4
Functionality
Bandwidth Monitoring
4.8/5
Alerts/Notifications
4.5/5
Activity Dashboard
4.5/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.2
Value for money
Starting price
No pricing info
0.3
Functionality
Alerts/Notifications
4.9/5
Alerts/Escalation
4.9/5
Baseline Manager
4.8/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.2
Value for money
Starting price
No pricing info
0.4
Functionality
Alerts/Notifications
4.6/5
Access Controls/Permissions
3.8/5
Anomaly Detection
2.7/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.3
Value for money
Starting price
No pricing info
0.5
Functionality
API
5/5
Audit Trail
5/5
Alerts/Notifications
4.7/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.2
Value for money
No pricing info
Starting price
No pricing info
0.4
Functionality
Asset Discovery
5/5
KPI Monitoring
5/5
Event Logs
4.6/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.2
Value for money
Starting price
No pricing info
0.4
Functionality
Alerts/Escalation
5/5
Application-Level Analysis
4.9/5
Activity Dashboard
4.9/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.2
Value for money
Starting price
No pricing info
0.4
Functionality
Activity Dashboard
5/5
Application Management
5/5
Availability Testing
4.5/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.1
Value for money
Starting price
No pricing info
0.4
Functionality
Activity Tracking
5/5
API
5/5
Bandwidth Monitoring
4.7/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.1
Value for money
Starting price
No pricing info
0.6
Functionality
Alerts/Escalation
5/5
API
5/5
Compliance Management
5/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5
0.3
Value for money
No pricing info
Starting price
No pricing info
0.6
Functionality
Access Controls/Permissions
5/5
Alerts/Notifications
4.7/5
Application Management
4/5
Top Features
FTP Monitoring
4.8/5
Alerts/Notifications
4.6/5
Mail Server Monitoring
4.3/5