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Weather · head to head

PurpleAir vs Tomorrow.io

PurpleAir logo

PurpleAir

Weather

Real-time air quality monitoring for communities

From
$229/one-time
Rated
-
Full reviewWebsite
Tomorrow.io logo

Tomorrow.io

Weather

Weather intelligence platform for business decisions

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Tomorrow.io 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).; Tomorrow.io no transparent pricing displayed on marketing website
  • They diverge on capability: PurpleAir covers PM2.5 monitoring, Tomorrow.io covers Minute-by-minute forecasts.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which PurpleAir and Tomorrow.io actually diverge.

Attributes where PurpleAir and Tomorrow.io differ
AttributePurpleAirTomorrow.io
Starting price$229/one-timeFree
Pricing modelone-timeUnknown
Free tierNoYes
PlatformsWeb, Api, HardwareWeb API
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
  • Historical data
  • Community network
  • API access
  • API access
  • Home Assistant
  • Data downloads

Only in Tomorrow.io

  • Minute-by-minute forecasts
  • Weather API
  • Road conditions
  • Air quality
  • Pollen data
  • REST API
  • Webhooks
  • Enterprise systems

Both cover

  • Web support
  • Api support

What people use each for

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

PurpleAir

  • Professional Worknot Tomorrow.io
  • Content Creationnot Tomorrow.io

Tomorrow.io

  • Real-time weather data for mobile applicationsnot PurpleAir
  • Enterprise weather risk managementnot PurpleAir
  • Fleet management and routing optimizationnot PurpleAir
  • Agricultural decision-making systemsnot PurpleAir
  • Supply chain planningnot 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).

Tomorrow.io

  • No transparent pricing displayed on marketing website
  • Requires contacting sales for enterprise platform demos
  • Free tier limited to Weather API with usage restrictions
  • Custom pricing model makes budget planning difficult for prospective customers

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

Tomorrow.io

Free

No published plan breakdown. See the Tomorrow.io review.

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 Tomorrow.io if

  • You need minute-by-minute forecasts.
  • You want to start without paying.
  • You work on Web API.
  • You also want weather api.
Tomorrow.io review

Questions people ask

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

Answered from the vendors’ own pages

Tomorrow.io: Does Tomorrow.io offer free access?

Yes, Tomorrow.io offers a free Weather API tier for development and limited production use. Access the free tier by signing up at app.tomorrow.io/signup.

Source
Tomorrow.io: How much do Tomorrow.io enterprise solutions cost?

Tomorrow.io does not publish specific enterprise pricing. Customers must contact sales or request a demo to receive custom quotes for their platform suites (Shield, Forge, GroundControl, Altitude, Gridline).

Source
Tomorrow.io: What platforms does Tomorrow.io offer?

Tomorrow.io offers weather data via its free API, plus enterprise platforms including Shield for risk management, Forge for operations, GroundControl for aviation, Altitude for advanced analytics, Gridline for utilities, and Trackline for transportation.

Source
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