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Weather · head to head

PurpleAir vs Visual Crossing Weather

PurpleAir logo

PurpleAir

Weather

Real-time air quality monitoring for communities

From
$229/one-time
Rated
-
Full reviewWebsite
Visual Crossing Weather logo

Visual Crossing Weather

Weather

Historical and forecast weather data for any location

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Visual Crossing Weather has a free tier, so it costs nothing to try first.
  • Each has a real cost: 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).; Visual Crossing Weather sub hourly weather history, solar and wind energy elements, soil and evapotranspiration data and degree day calculations are excluded from the Professional plan
  • They diverge on capability: PurpleAir covers PM2.5 monitoring, Visual Crossing Weather covers Historical weather.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which PurpleAir and Visual Crossing Weather actually diverge.

Attributes where PurpleAir and Visual Crossing Weather differ
AttributePurpleAirVisual Crossing Weather
Starting price$229/one-timeFree
Pricing modelone-timefreemium
Free tierNoYes
PlatformsWeb, Api, HardwareApi, Web
Founded20152003

Identical on both: user rating (Not yet rated), category (Weather).

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 PurpleAir

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

Only in Visual Crossing Weather

  • Historical weather
  • 15-day forecasts
  • Weather query builder
  • Bulk downloads
  • REST API
  • Excel add-in
  • Python library

Both cover

  • API access
  • API access
  • Web support
  • Api support

What people use each for

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

PurpleAir

  • Professional Worknot Visual Crossing Weather
  • Content Creationnot Visual Crossing Weather

Visual Crossing Weather

  • Pulling historical weather records for analysis and modellingnot PurpleAir
  • Adding forecast data to applications through a weather APInot PurpleAir
  • Weather driven analytics for energy, agriculture and logisticsnot PurpleAir

Where each one falls short

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

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).

Visual Crossing Weather

  • Sub hourly weather history, solar and wind energy elements, soil and evapotranspiration data and degree day calculations are excluded from the Professional plan
  • Removing the attribution requirement needs the Corporate plan or above
  • Usage is metered in records rather than API calls, and the metered plan requires a cost calculator to work out the bill
  • Per record rates are not stated on the editions page
  • Enterprise terms are custom rather than published

Pricing, plan by plan

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

Visual Crossing Weather

Free
  • FreeFree
    • 1,000 records/day
    • 15-day forecast
    • Historical data
  • Professional$35/month
    • 10,000 records/day
    • Full API
    • Support

Which should you pick?

Choose PurpleAir if

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

Choose Visual Crossing Weather if

  • You need historical weather.
  • You want to start without paying.
  • You work on Api, Web.
  • You also want 15-day forecasts.
Visual Crossing Weather review

Questions people ask

Is PurpleAir or Visual Crossing Weather better?
Neither clearly leads. PurpleAir starts at $229/one-time and Visual Crossing Weather at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PurpleAir or Visual Crossing Weather?
Visual Crossing Weather has a free tier; the other does not. Paid plans start at $229/one-time for PurpleAir and Free for Visual Crossing Weather.
Does PurpleAir or Visual Crossing Weather run on more platforms?
PurpleAir runs on Web, Api, Hardware. Visual Crossing Weather runs on Api, Web.
Can I use Visual Crossing Weather for free?
Yes. Visual Crossing Weather has a free tier, so you can try it without paying. PurpleAir starts at $229/one-time.
What is PurpleAir best used for?
PurpleAir is most often used for professional work, content creation. Of those, professional work and content creation are not what Visual Crossing Weather is typically brought in for.
What can PurpleAir do that Visual Crossing Weather cannot?
PurpleAir covers PM2.5 monitoring, Real-time map, Historical data, Community network. Visual Crossing Weather covers Historical weather, 15-day forecasts, Weather query builder, Bulk downloads. Both handle API access, API access, Web support, Api support.

Answered from the vendors’ own pages

Visual Crossing Weather: Does Visual Crossing offer free weather data?

Yes, the first 1,000 daily records are free and include both historical and forecast data for commercial use.

Source
Visual Crossing Weather: Can I use Visual Crossing weather data for commercial purposes?

Yes, all Visual Crossing subscription tiers include commercial use rights.

Source
Visual Crossing Weather: What is the difference between the Metered and Corporate plans on Visual Crossing?

The Metered plan charges pay-as-you-go for unlimited records with 5 locations per query. The Corporate plan has unlimited records with fair use policy, 1,000 locations per query, advanced features like solar and wind energy, and premium support included.

Source
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