Aerzeit vs Drying Day
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Aerzeit
This app analyzes outdoor conditions for the next 48 hours to identify optimal times for ventilation. It allows customization of temperature ranges and environmental factors like rain, humidity, and pollen to help you decide when to open windows.
- 48-hour outdoor condition forecast
- Customizable temperature ranges
- Rain, humidity, wind, air quality, pollen filters
- UV and sun position tracking
- Apple Watch app and complication
- Home Screen widget
- Multi-language support
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Aerzeit watches the next 48 hours and tells you the stretches when the air outside is in the temperature range you chose — so you know when it's worth opening up instead of leaving the system running. When nothing in the next two days is worth it, it says so. Everything else is yours to switch on: rain, humidity, wind, air quality, pollen, UV, sun position, and the hours you'd actually consider opening. Set it once for your climate and your house, wherever in the country you are. WHAT IT DOES Pick the outdoor temperature range you'd be happy to let in. Aerzeit watches the local forecast and tells you when conditions match — once a day, at a time you choose. It can also tell you the moment a window opens, and the moment to close it again. Turn on the filters that matter where you live: rain, humidity, wind, air quality, pollen, UV, and the hours of the day you'd actually consider opening up. Set a shortest and longest opening, so you don't hear about gaps too brief to use or leave one open longer than you meant to. A 48-hour chart shows every condition in one place, so you can see where they agree and where they don't. Tap "Use current location" to set a spot to roughly 1 km precision, or search for a town. A companion Apple Watch app and complication show the same at-a-glance status on your wrist, and keep themselves current even when your phone is elsewhere. A Home Screen widget shows the next open-window period at a glance. Aerzeit runs in 50 languages, picked on the Locations page beside °C/°F. WHAT IT DOESN'T DO Aerzeit doesn't model your home — it reports the outdoor conditions and leaves the judgement to you. Opening, sizing and timing the actual airing is yours. It reports public weather and environmental data (including air quality, pollen and UV) as a comfort tool, not medical advice; if a health condition makes any of those matter for you, follow your clinician's guidance. PRIVATE BY DESIGN - Empty Privacy Manifest. The app calls none of Apple's required-reason APIs. - No language detection. Aerzeit never reads your phone's language setting — that's one of the required-reason APIs it avoids — so you pick from 50 languages in the app instead. - Minimal data. To fetch a forecast, the app sends a roughly 7 km grid cell to Aerzeit's server — no account, no identifiers, no raw GPS, no history. Your temperature range and all your filter settings stay on your device. The data export (Export my data) shows exactly what's held — it's all on your phone. - No accounts. No analytics. No tracking. No advertising. No third-party SDKs beyond a small geospatial maths library. MADE INDEPENDENTLY Aerzeit is built and published by Samuel Harrold, based in Indianapolis, Indiana, USA. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Drying Day
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Some days the clothesline does a full load in two hours. Some days everything hangs damp until dark, and some days the rain gets to your laundry before you do. Drying Day answers the only laundry question that matters, before you press start on the washer: is it worth hanging outside today? A verdict, not a weather chart No radar to squint at, no humidity graphs to interpret. One clear answer in plain words — great drying day, good day to line-dry, drying will be slow, risky with a chance of rain, or better dry indoors — with the reason in one warm sentence underneath. What you get • An estimated drying window for today, with suggested times to hang out and bring in: "9 am – 3:30 pm." • How fast the line will work — roughly when a full load should be dry. • A suggested bring-in time, and why: forecast rain, or dusk. • The next three days as laundry advice, with the best laundry day tagged — so "do a load today or Saturday?" takes one glance. • Quiet, useful alerts (all optional): a heads-up the evening before a good drying day, a nudge when the window opens, and a reminder to bring the laundry in before forecast rain. • A "play it safe with rain" switch for people who'd rather rewash nothing, ever. • Wind in mph, humidity as a percentage, times that follow your clock setting. • A last-checked note when you're offline, so you always know how fresh the advice is. Honest about forecasts A forecast is a guess, and Drying Day says so. It hedges where hedging is honest, tells you the main risk out loud, and leaves the final call where it belongs — with the sky over your own clothesline. Built for people who line-dry Whether it's a backyard clothesline, a retractable line on the porch, a rack on the balcony, or a drying rack by the window on the days the sky says no — if you hang laundry to dry, this is for you. Made in Australia, where a good drying day is a genuine household event, and it works anywhere in the world there's weather and wet laundry. Quietly respectful No accounts, no tracking, no laundry log. Your location is used to fetch the forecast and show your area’s name, and we run no servers of our own — the privacy policy explains the rest, including the single ad. Free with a single unobtrusive banner; one small one-time purchase removes it forever. No subscriptions, ever. Weather data by WeatherAPI.com. Drying Day is an informational tool — it reads forecasts, it doesn't control clouds.
Screenshots
Verdict
The clearest difference is ads: Aerzeit at none against Drying Day's shown. Aerzeit also leads on update cadence (every 3 days vs every 3 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Aerzeit sells 1 in-app purchase, starting at $9.99 per year and Drying Day sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Aerzeit ships an update every 3 days, Drying Day every 3 weeks. The most recent releases landed on November 5, 2026 and November 4, 2026 respectively.
| Parameter | Aerzeit | Drying Day |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 days — better | Every 3 weeks |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 16.4 | 15.0 — better |
| Further details — not scored | ||
| Size | 28 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Samuel Harrold | I OSTAPENKO & Y OSTAPENKO |
In-app purchases
Aerzeit
- Aerzeit Premium$9.991 Year
Drying Day
- Small thank-you2 variants$0.49
- Thank-you2 variants$1.99
- Big thank-you2 variants$2.99









