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Keil MDK vs Nagios XI

Keil MDK logo

Keil MDK

Developer Tools

Microcontroller Development Kit for Arm-based devices

From
Free
Free plan
Yes
Full reviewWebsite
Nagios XI logo

Nagios XI

Technology

Enterprise-grade monitoring solution with advanced visualization and reporting

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Each has a real cost: Keil MDK pricing for Essential and Professional subscriptions not disclosed on primary site; Nagios XI free Edition caps at 7 nodes or 100 services, whichever limit is hit first
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Keil MDK and Nagios XI actually diverge.

Attributes where Keil MDK and Nagios XI differ
AttributeKeil MDKNagios XI
Pricing modelfreemiumone-time
CategoryDeveloper ToolsTechnology

Identical on both: starting price (Free), free tier (Yes), platforms (Web), user rating (Not yet rated).

What people use each for

The jobs each tool is most often brought in to do.

Keil MDK

  • Embedded software developmentnot Nagios XI
  • ARM microcontroller programmingnot Nagios XI
  • Professional development environmentsnot Nagios XI

Nagios XI

  • Monitoring servers, networks, and IoT devices for status changesnot Keil MDK
  • Detecting infrastructure problems before they cause outagesnot Keil MDK
  • Creating customizable dashboards for real-time IT visibilitynot Keil MDK
  • Tracking SLA compliance and generating capacity planning reportsnot Keil MDK

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Keil MDK

  • Pricing for Essential and Professional subscriptions not disclosed on primary site
  • Customers must contact Arm Developer Tools store for subscription rates

Nagios XI

  • Free Edition caps at 7 nodes or 100 services, whichever limit is hit first
  • Standard Edition is licensed per node count, starting at $2,595 for 100 nodes and rising to $14,995 for 1,000 nodes
  • Enterprise Edition, which adds capacity planning and SLA reporting, is sold as an add-on starting at $4,690 for 100 nodes on top of the base license
  • Sitewide Edition for large distributed environments has no published price and requires contacting sales

Pricing, plan by plan

Keil MDK

Free

No published plan breakdown. See the Keil MDK review.

Nagios XI

Free
  • Free EditionFree
    • 7 nodes OR 100 services limit
    • Self-supported only
  • Standard 100-Node$2595/perpetual
    • 100 nodes
    • First year includes support and upgrades
  • Standard 500-Node$8295/perpetual
    • 500 nodes
    • First year includes support and upgrades
  • Standard 1000-Node$14995/perpetual
    • 1,000 nodes
    • First year includes support and upgrades

Which should you pick?

Choose Keil MDK if

  • You want to start without paying.
Keil MDK review

Choose Nagios XI if

  • You want to start without paying.
Nagios XI review

Questions people ask

Is Keil MDK or Nagios XI better?
Neither clearly leads. Keil MDK starts at Free and Nagios XI at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keil MDK or Nagios XI?
Keil MDK starts at Free and Nagios XI at Free.
Does Keil MDK or Nagios XI run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Keil MDK for free?
Both have a free tier, so you can try either at no cost before committing.
What is Keil MDK best used for?
Keil MDK is most often used for embedded software development, arm microcontroller programming, professional development environments. Of those, embedded software development and arm microcontroller programming are not what Nagios XI is typically brought in for.

Answered from the vendors’ own pages

Keil MDK: Does Keil MDK have a free version?

Yes, Keil MDK Community Edition is free for non-commercial projects. Essential and Professional editions are available as monthly or annual subscriptions.

Source
Nagios XI: What is Nagios XI's pricing model?

Nagios XI uses perpetual licensing with one-time purchase costs based on node count, ranging from $2,595 for 100 nodes to $14,995 for 1,000 nodes.

Source
Keil MDK: How much do Keil MDK paid editions cost?

Specific pricing for Essential and Professional editions is not published on the main site. Rates are available from the Arm Developer Tools store or by contacting Arm sales.

Source
Nagios XI: Is there a free version of Nagios XI?

Yes, Nagios XI Free Edition is available at no cost with a limit of 7 nodes or 100 services, whichever is reached first.

Source
Nagios XI: What is included with Nagios XI licensing?

Initial licenses include one year of free version upgrades, up to 10 support cases, and support portal access. Each license permits three installations: production, backup/failover, and testing/development.

Source
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