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Agriculture · head to head

Halter vs PurpleAir

Halter logo

Halter

Agriculture

Solar collar virtual fencing and cow monitoring for dairy and beef grazing

From
9.9/month
Rated
-
Full reviewWebsite
PurpleAir logo

PurpleAir

Weather

Real-time air quality monitoring for communities

From
$229/one-time
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Halter the subscription is permanent and per head, so a 500 cow dairy carries a five-figure annual bill indefinitely and the collars become inert if it lapses; there is no owned-outright end state.; PurpleAir purpleAir sensors are one-time hardware purchases rather than a subscription, priced $199 to $279 USD per unit for named models (PA-I-Indoor, PA-II, PA-II-SD), per the vendor's own store (archived, 2021).
  • They diverge on capability: Halter covers Virtual fencing, PurpleAir covers PM2.5 monitoring.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Halter and PurpleAir actually diverge.

Attributes where Halter and PurpleAir differ
AttributeHalterPurpleAir
Starting price9.9/month$229/one-time
Pricing modelPer cow per month plus one-time installone-time
PlatformsiOS, Android, WebWeb, Api, Hardware
CategoryAgricultureWeather
FoundedUnknown2015

Identical on both: free tier (No), user rating (Not yet rated).

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 Halter

  • Virtual fencing
  • Remote shifting
  • Heat detection
  • Health alerts
  • Pasture management
  • Solar collars
  • Exclusion zones

Only in PurpleAir

  • PM2.5 monitoring
  • Real-time map
  • Historical data
  • Community network
  • API access
  • API access
  • Home Assistant
  • Data downloads

What people use each for

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

Halter

  • A 600 cow grazing dairy that shifts breaks twice daily and cannot recruit enough staff to do itnot PurpleAir
  • A beef ranch fencing off riparian margins and wetlands without building physical fencenot PurpleAir
  • A dairy replacing a separate heat detection collar system with one collar that also does fencingnot PurpleAir
  • An operation running cell grazing on country where the cost of internal fencing exceeds the collar subscriptionnot PurpleAir

PurpleAir

  • Professional Worknot Halter
  • Content Creationnot Halter

Where each one falls short

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

Halter

  • The subscription is permanent and per head, so a 500 cow dairy carries a five-figure annual bill indefinitely and the collars become inert if it lapses; there is no owned-outright end state.
  • On-farm tower infrastructure is a separate up-front install cost that is not in the headline per-cow price, and terrain with hills or bush can require more towers than the initial quote assumed.
  • Coverage is concentrated in New Zealand, Australia and parts of the United States; buyers elsewhere face no local support, no local install crew and uncertain regulatory acceptance of virtual fencing.
  • Virtual fencing is not universally legal or accepted: some jurisdictions and some organic or welfare certification schemes restrict aversive stimulus devices, which can decide eligibility before price is even discussed.
  • Total vendor lock-in on collar, towers, app and animal data means there is no second source for a replacement collar and no way to keep the fencing working if the commercial relationship ends.

PurpleAir

  • PurpleAir sensors are one-time hardware purchases rather than a subscription, priced $199 to $279 USD per unit for named models (PA-I-Indoor, PA-II, PA-II-SD), per the vendor's own store (archived, 2021).

Pricing, plan by plan

Halter

9.9/month
  • Core$9.9/month
    • Virtual fencing and remote shifting
    • Per cow per month
    • On-farm tower infrastructure charged separately
  • Pro$undefined/month
    • Everything in Core
    • Heat detection and reproduction tools
    • Health and behaviour alerts
  • Unlimited$undefined/month
    • Everything in Pro
    • Full feature set for larger operations
    • Pasture and residual management

PurpleAir

$229/one-time
  • Outdoor Sensor$229/one-time
    • PM2.5 monitoring
    • Cloud connectivity
    • Map access
  • Indoor Sensor$199/one-time
    • Indoor monitoring
    • WiFi enabled
    • Real-time data

Which should you pick?

Choose Halter if

  • You need virtual fencing.
  • You work on iOS, Android, Web.
  • You also want remote shifting.
Halter review

Choose PurpleAir if

  • You need pm2.5 monitoring.
  • You work on Web, Api, Hardware.
  • You also want real-time map.
PurpleAir review

Questions people ask

Is Halter or PurpleAir better?
Neither clearly leads. Halter starts at 9.9/month and PurpleAir at $229/one-time, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Halter or PurpleAir?
Halter starts at 9.9/month and PurpleAir at $229/one-time.
Does Halter or PurpleAir run on more platforms?
Halter runs on iOS, Android, Web. PurpleAir runs on Web, Api, Hardware.
What is Halter best used for?
Halter is most often used for a 600 cow grazing dairy that shifts breaks twice daily and cannot recruit enough staff to do it, a beef ranch fencing off riparian margins and wetlands without building physical fence, a dairy replacing a separate heat detection collar system with one collar that also does fencing, an operation running cell grazing on country where the cost of internal fencing exceeds the collar subscription. Of those, a 600 cow grazing dairy that shifts breaks twice daily and cannot recruit enough staff to do it and a beef ranch fencing off riparian margins and wetlands without building physical fence are not what PurpleAir is typically brought in for.
What can Halter do that PurpleAir cannot?
Halter covers Virtual fencing, Remote shifting, Heat detection, Health alerts. PurpleAir covers PM2.5 monitoring, Real-time map, Historical data, Community network.

Answered from the vendors’ own pages

Halter: Do I buy the collars or rent them?

In practice you are buying into a per-cow monthly subscription plus a one-time install for the towers. The collars are not useful without an active subscription.

Halter: What does it actually cost for 500 cows?

Starting from around NZ$9.90 per cow per month, that is roughly NZ$59,000 a year before the one-time tower infrastructure cost, and it recurs every year.

Halter: Can I finance it?

New Zealand dairy farmers can finance the install through ANZ, ASB, BNZ or Westpac over two years, and paying the subscription up front attracts a discount.

Halter: Does it replace heat detection collars?

Yes on the higher tiers. That is the main reason dairies justify the cost, because it removes a second per-cow system.

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