What is the best pollen app for iPhone?

It depends what you need. Allergy Plus by Pollen.com has the longest US forecasting track record but states it covers the continental US only. ZYRTEC AllergyCast predicts how your symptoms are likely to feel. IQAir AirVisual is the strongest for air quality specifically. Respira covers twelve countries, names eleven US pollen species, and keeps a symptom diary you can export for a clinician.

Which pollen app works outside the United States?

Respira covers the United States, Spain, Portugal, France, Italy, Germany, Ireland and the United Kingdom. Allergy Plus by Pollen.com states in its listing that it is currently for use in the continental US only. IQAir AirVisual covers over 100 countries, but for air quality rather than pollen species.

Which pollen app predicts my symptoms?

ZYRTEC AllergyCast produces a personalised daily symptom-severity prediction from the symptoms you log. Respira records symptoms in a diary and reports measured and forecast pollen, but does not predict how you personally will feel.

Best pollen allergy apps for iPhone

We make one of these, so read this with that in mind. What follows is not a ranking with Respira at the top: it is what each app is genuinely best at, taken from their own App Store listings on 2026-09-03, including the places where the others are the better answer.

The short answer

Longest US track record: Allergy Plus by Pollen.com. Two decades of US allergy forecasting behind it and around 22,900 ratings. Its listing states it is for the continental US only.
Predicting how you will feel: ZYRTEC AllergyCast. It turns your logged symptoms into a personalised daily severity prediction, which none of the others here do.
Air quality: IQAir AirVisual, and not close. Over 500,000 locations in 100+ countries, historical data and 3D maps. Pollen is not its focus.
Pollen outside the US, and a diary you can hand to a doctor: Respira. Eight countries, eleven US species, an exportable symptom diary, and Home and Lock Screen widgets. It is also the newest here, with no US ratings yet.

The apps

Allergy Plus by Pollen.com

The app of Pollen.com, a US allergy-forecasting site that has been running for around two decades. It is the most established name in this list for pollen specifically, and its US forecast history is longer than anyone else's here.

Free. 4.8 from about 22,900 ratings (US App Store, 2026-09-03). Full comparison with Respira

ZYRTEC AllergyCast

A pharmaceutical brand's allergy app. Its distinguishing feature is a personalised symptom-severity prediction: you log how you feel, and it forecasts how bad your day is likely to be, getting more specific to you over time.

Free. 4.2 from about 550 ratings (US App Store, 2026-09-03). Full comparison with Respira

IQAir AirVisual

An air-quality app first, from a company whose core business is air-quality monitoring hardware and data. It covers over 500,000 locations across more than 100 countries, with historical data, 7-day forecasts and 3D pollution maps.

Free. 4.8 from about 44,700 ratings (US App Store, 2026-09-03). Full comparison with Respira

Respira

A pollen and air-quality app covering twelve countries. In the United States it reports the eleven species published by the Google Pollen API, including ragweed and oak, with air quality on the EPA scale; in Europe it uses the Copernicus CAMS model, enriched with national monitoring networks in Spain, Italy and Germany. It keeps a symptom, severity and medication diary you can export as a PDF, and shows levels on Home and Lock Screen widgets.

Free, with an optional Pro subscription. 4.9 from 14 ratings (Spanish App Store); not yet rated in the US.

Where Respira is not the right answer

If you want an app to tell you how bad your own symptoms are likely to be tomorrow, Respira does not do that: it reports measured and forecast pollen, and leaves the interpretation to you. AllergyCast is built around exactly that prediction.

If air quality rather than pollen is your reason for installing anything, AirVisual's coverage and history are far deeper than what Respira shows.

And if a large, settled US user base is what makes you trust an app, Respira does not have one yet. It launched in the United States in August 2026 and has no US ratings so far.

Try Respira

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Pollen by allergen

Respira is an informational tool. It does not replace diagnosis or advice from a medical professional. Competitor details are taken from their public App Store listings on 2026-09-03 and may have changed since.