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Technology · head to head

Eclipse vs Five9

Eclipse logo

Eclipse

Technology

The Eclipse Foundation - home to a global community

From
Free
Rated
-
Full reviewWebsite
Five9 logo

Five9

Telecommunications

Intelligent cloud contact center

From
$149/month
Rated
-
Full reviewWebsite

The short version

  • Only Eclipse has a free tier, so it costs nothing to try first.
  • Each has a real cost: Eclipse high memory consumption and CPU usage, especially with multiple plugins installed; Five9 a 50 seat minimum applies to the published rates, so the entry cost on the $119 Digital plan is $5,950 a month
  • They diverge on capability: Eclipse covers Java development environment, Five9 covers Intelligent routing.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Eclipse and Five9 actually diverge.

Attributes where Eclipse and Five9 differ
AttributeEclipseFive9
Starting priceFree$149/month
Pricing modelUnknownsubscription
Free tierYesNo
PlatformsWindows, macOS, LinuxWeb, Desktop
CategoryTechnologyTelecommunications

Identical on both: user rating (Not yet rated), founded (2001).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Eclipse

  • Java development environment
  • Extensible plugin architecture
  • Integrated debugger
  • Code refactoring
  • Version control integration
  • Build automation
  • Multi-language support
  • Rich client platform

Only in Five9

  • Intelligent routing
  • IVR
  • ACD
  • Dialer
  • WFM
  • Quality management
  • Analytics
  • Salesforce

What people use each for

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

Eclipse

  • Java application developmentnot Five9
  • Enterprise software developmentnot Five9
  • Web application developmentnot Five9
  • Plugin developmentnot Five9
  • Educational programmingnot Five9

Five9

  • Cloud contact centre across voice, chat, email and social messagingnot Eclipse
  • Routing and managing high volume customer interactionsnot Eclipse

Where each one falls short

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

Eclipse

  • High memory consumption and CPU usage, especially with multiple plugins installed
  • Slow startup times and performance degradation with large projects or many open editors
  • Requires configuration of eclipse.ini file to optimize heap sizes for adequate performance
  • User interface considered outdated compared to modern IDE alternatives
  • User base fell from 39% of Java developers in 2024 to 28% in 2025, indicating market decline

Five9

  • A 50 seat minimum applies to the published rates, so the entry cost on the $119 Digital plan is $5,950 a month
  • Prices are per concurrent user rather than per named agent, which changes what a seat means when shifts overlap
  • Voice is excluded from the Digital plan and requires a quote
  • Usage based charges apply on top of the per seat rate
  • Three of the five tiers publish no price at all

Pricing, plan by plan

Eclipse

Free

No published plan breakdown. See the Eclipse review.

Five9

$149/month
  • Core$149/month
    • Inbound/outbound
    • IVR
    • Basic CTI
  • Premium$169/month
    • Core + Chat/email
    • Quality management
  • Optimum$199/month
    • Premium + WFM
    • Proactive chat
  • Ultimate$229/month
    • Full suite
    • Advanced analytics

Which should you pick?

Choose Eclipse if

  • You need java development environment.
  • You want to start without paying.
  • You work on Windows, macOS, Linux.
  • You also want extensible plugin architecture.
Eclipse review

Choose Five9 if

  • You need intelligent routing.
  • You work on Web, Desktop.
  • You also want ivr.
Five9 review

Questions people ask

Is Eclipse or Five9 better?
Neither clearly leads. Eclipse starts at Free and Five9 at $149/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Eclipse or Five9?
Eclipse has a free tier; the other does not. Paid plans start at Free for Eclipse and $149/month for Five9.
Does Eclipse or Five9 run on more platforms?
Eclipse runs on Windows, macOS, Linux. Five9 runs on Web, Desktop.
Can I use Eclipse for free?
Yes. Eclipse has a free tier, so you can try it without paying. Five9 starts at $149/month.
What is Eclipse best used for?
Eclipse is most often used for java application development, enterprise software development, web application development, plugin development. Of those, java application development and enterprise software development are not what Five9 is typically brought in for.
What can Eclipse do that Five9 cannot?
Eclipse covers Java development environment, Extensible plugin architecture, Integrated debugger, Code refactoring. Five9 covers Intelligent routing, IVR, ACD, Dialer.

Answered from the vendors’ own pages

Eclipse: How much does Eclipse IDE cost?

Eclipse IDE is completely free and open-source, released under the Eclipse Public License 2.0.

Source
Five9: What is the minimum team size required to use Five9?

Five9 requires a minimum commitment of 50 seats for any subscription plan.

Source
Five9: How is Five9 pricing calculated, per user, flat rate, or usage-based?

Five9 offers flexible pricing models: per concurrent user, per named agent, or pay-per-use. The pricing structure varies depending on the chosen bundle.

Source
Five9: What does the entry-level Digital bundle include, and what does it cost?

The Digital bundle costs $119 per month per seat and supports digital channels only. Higher tiers (Core at $159, Plus, Pro, and Enterprise) are available, with Plus/Pro/Enterprise requiring contact with sales for pricing.

Source
Five9: Are there additional charges beyond the base subscription?

Yes. All bundles include 3000 AI minutes per seat, but additional AI usage incurs charges. SMS messaging also has usage-based charges applied separately.

Source
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