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Weather · head to head

PurpleAir vs Weatherstack

PurpleAir logo

PurpleAir

Weather

Real-time air quality monitoring for communities

From
$229/one-time
Rated
-
Full reviewWebsite
Weatherstack logo

Weatherstack

Weather

Real-time weather API trusted by thousands

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Weatherstack 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).; Weatherstack the free tier allows 100 API calls a month, which is a demo rather than a usable allowance
  • They diverge on capability: PurpleAir covers PM2.5 monitoring, Weatherstack covers Real-time weather.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which PurpleAir and Weatherstack actually diverge.

Attributes where PurpleAir and Weatherstack differ
AttributePurpleAirWeatherstack
Starting price$229/one-timeFree
Pricing modelone-timefreemium
Free tierNoYes
PlatformsWeb, Api, HardwareApi
Founded20152016

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
  • Community network
  • API access
  • API access
  • Home Assistant
  • Data downloads
  • Web support

Only in Weatherstack

  • Real-time weather
  • Forecasts
  • Location lookup
  • Bulk queries
  • REST API
  • JSON responses
  • HTTPS

Both cover

  • Historical data
  • Api support

What people use each for

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

PurpleAir

  • Professional Worknot Weatherstack
  • Content Creationnot Weatherstack

Weatherstack

  • Current weather lookups by location in an applicationnot PurpleAir
  • Historical weather data for analysis on the paid tiersnot PurpleAir
  • Short and medium range forecastsnot PurpleAir
  • Bulk location queries on the higher plansnot 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).

Weatherstack

  • The free tier allows 100 API calls a month, which is a demo rather than a usable allowance
  • Historical weather data starts at the Standard plan, $9.99 a month for 50,000 calls
  • Forecasting is tiered: 7 days from Professional at $49.99 a month and 14 days from Business at $99.99
  • Multi-language responses and bulk queries need Professional or above
  • Going past the monthly quota incurs overage charges rather than throttling

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

Weatherstack

Free
  • FreeFree
    • 250 calls/month
    • Current weather
    • Basic data
  • Standard$9.99/month
    • 50,000 calls/month
    • Forecasts
    • Historical

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 Weatherstack if

  • You need real-time weather.
  • You want to start without paying.
  • You work on Api.
  • You also want forecasts.
Weatherstack review

Questions people ask

Is PurpleAir or Weatherstack better?
Neither clearly leads. PurpleAir starts at $229/one-time and Weatherstack at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, PurpleAir or Weatherstack?
Weatherstack has a free tier; the other does not. Paid plans start at $229/one-time for PurpleAir and Free for Weatherstack.
Does PurpleAir or Weatherstack run on more platforms?
PurpleAir runs on Web, Api, Hardware. Weatherstack runs on Api.
Can I use Weatherstack for free?
Yes. Weatherstack 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 Weatherstack is typically brought in for.
What can PurpleAir do that Weatherstack cannot?
PurpleAir covers PM2.5 monitoring, Real-time map, Community network, API access. Weatherstack covers Real-time weather, Forecasts, Location lookup, Bulk queries. Both handle Historical data, Api support.

Answered from the vendors’ own pages

Weatherstack: Is there a free plan for Weatherstack?

Yes, Weatherstack has a free plan that includes 100 API calls per month with real-time weather data and HTTPS encryption.

Source
Weatherstack: What is the cheapest paid plan for Weatherstack?

The Standard plan costs $9.99 per month (or $8.99 monthly when billed annually) and includes 50,000 API calls per month.

Source
Weatherstack: Do Weatherstack's paid plans allow overage charges beyond the monthly limit?

Yes, all paid tiers allow overage charges for API calls beyond the monthly allocation.

Source
Weatherstack: How much can I save with annual billing on Weatherstack?

Annual billing offers up to 15% savings compared to monthly payments across all paid tiers.

Source
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