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Energy · head to head

OSIsoft PI System vs Wattwatchers EMS

OSIsoft PI System logo

OSIsoft PI System

Energy

Real-time operational intelligence for industrial operations

From
On request
Rated
-
Full reviewWebsite
Wattwatchers EMS logo

Wattwatchers EMS

Energy

Smart building energy management system

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: OSIsoft PI System oSIsoft is now AVEVA and osisoft.com redirects to the AVEVA PI System pages; Wattwatchers EMS requires hardware installation at each monitoring point, increasing total cost of ownership
  • They diverge on capability: OSIsoft PI System covers Real-time data collection, Wattwatchers EMS covers Real-time monitoring.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which OSIsoft PI System and Wattwatchers EMS actually diverge.

Attributes where OSIsoft PI System and Wattwatchers EMS differ
AttributeOSIsoft PI SystemWattwatchers EMS
Pricing modelquoteUnknown
PlatformsWindows, Web, ApiWeb, iOS, Android, Cloud
Founded19802007

Identical on both: starting price (On request), free tier (No), user rating (Not yet rated), category (Energy).

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 OSIsoft PI System

  • Real-time data collection
  • Time-series data storage
  • Advanced analytics
  • Asset framework
  • Visualization tools
  • Event frames
  • Data compression
  • Notifications and alerts

Only in Wattwatchers EMS

  • Real-time monitoring
  • Energy analytics
  • Smart recommendations
  • Alert system
  • Mobile app
  • Home Assistant
  • Google Home
  • Cloud deployment

Both cover

  • SSL encryption

What people use each for

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

OSIsoft PI System

  • Collecting and historising high frequency industrial process and sensor datanot Wattwatchers EMS
  • Operations dashboards and trend analysis for plants and utilitiesnot Wattwatchers EMS
  • Feeding real time operational data into analytics and digital twin applicationsnot Wattwatchers EMS

Wattwatchers EMS

  • Energy optimizationnot OSIsoft PI System
  • Cost reductionnot OSIsoft PI System

Where each one falls short

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

OSIsoft PI System

  • OSIsoft is now AVEVA and osisoft.com redirects to the AVEVA PI System pages
  • No pricing is published; osisoft.com/pricing resolves to AVEVA product pages with no rate, minimum or cost driver
  • Licensing runs through the AVEVA Flex Subscription Program rather than a published per-seat or per-tag price
  • The PI System is split across separately listed products including PI Server, PI Vision, PI Data Infrastructure and Edge Data Store

Wattwatchers EMS

  • Requires hardware installation at each monitoring point, increasing total cost of ownership
  • Built for small to medium portfolios; scaling to large portfolios may present usability challenges
  • Limited to energy monitoring; not a comprehensive building management system

Pricing, plan by plan

OSIsoft PI System

On request

No published plan breakdown. See the OSIsoft PI System review.

Wattwatchers EMS

On request

No published plan breakdown. See the Wattwatchers EMS review.

Which should you pick?

Choose OSIsoft PI System if

  • You need real-time data collection.
  • You work on Windows, Web, Api.
  • You also want time-series data storage.
OSIsoft PI System review

Choose Wattwatchers EMS if

  • You need real-time monitoring.
  • You work on Web, iOS, Android, Cloud.
  • You also want energy analytics.
Wattwatchers EMS review

Questions people ask

Is OSIsoft PI System or Wattwatchers EMS better?
Neither clearly leads. OSIsoft PI System starts at On request and Wattwatchers EMS at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, OSIsoft PI System or Wattwatchers EMS?
OSIsoft PI System starts at On request and Wattwatchers EMS at On request.
Does OSIsoft PI System or Wattwatchers EMS run on more platforms?
OSIsoft PI System runs on Windows, Web, Api. Wattwatchers EMS runs on Web, iOS, Android, Cloud.
What is OSIsoft PI System best used for?
OSIsoft PI System is most often used for collecting and historising high frequency industrial process and sensor data, operations dashboards and trend analysis for plants and utilities, feeding real time operational data into analytics and digital twin applications. Of those, collecting and historising high frequency industrial process and sensor data and operations dashboards and trend analysis for plants and utilities are not what Wattwatchers EMS is typically brought in for.
What can OSIsoft PI System do that Wattwatchers EMS cannot?
OSIsoft PI System covers Real-time data collection, Time-series data storage, Advanced analytics, Asset framework. Wattwatchers EMS covers Real-time monitoring, Energy analytics, Smart recommendations, Alert system. Both handle SSL encryption.

Answered from the vendors’ own pages

OSIsoft PI System: How much does the AVEVA PI System cost?

AVEVA PI System (formerly OSIsoft PI System) operates on a subscription-based commercial model with customized pricing. The company structures subscriptions to match specific use cases and business needs, requiring direct contact with account representatives.

Source
Wattwatchers EMS: What data does Wattwatchers monitor?

Wattwatchers measures consumption at the device or circuit level in real-time, identifies equipment inefficiencies, and streams data through cloud dashboards for detailed energy consumption pattern analysis.

Source
OSIsoft PI System: What is AVEVA PI System's pricing model?

AVEVA offers subscription-based licensing for software components running on-premises or in the cloud. Subscriptions are customized per customer use case, and pricing is determined through consultation with local account representatives.

Source
Wattwatchers EMS: What web-based tools does Wattwatchers provide?

Wattwatchers provides Fleet Management for fleet overview and device health, an Onboarding tool for smartphone-based device configuration, and a Dashboard for customers to view sites and data.

Source
Wattwatchers EMS: What is the mydata.energy app?

mydata.energy is Wattwatchers' mobile application available on iPhone and Android that provides real-time energy management and monitoring for homes and small businesses.

Source
Wattwatchers EMS: How does ADEPT help with energy management?

ADEPT is Wattwatchers' agile development platform for distributed energy that enables fleet analytics, real-time performance analysis, and zero-code prototyping of custom analytics rules.

Source
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