TL;DR: If you want a wind alarm that’s actually free and actually rings, WindUp is the pick — it’s the only one of the six that watches live stations and wakes you up even on Do Not Disturb, with no subscription. WindAlert and iKitesurf have alarms too, but you pay for them. Windy, Windfinder and PredictWind are excellent forecast apps with no live alarm at all.
Most “best wind app” lists rank forecasts. This one ranks the alarm — the feature that pings you the second your spot is on, so you stop refreshing a forecast all morning and actually catch the session.
That’s a narrower question, and the answers sort out fast. Three of the six don’t have a live alarm. Two have one but charge for it. One gives it away free. Here’s the honest breakdown.
What counts as a real wind alarm app?
There are two very different features people call a “wind alarm,” and conflating them is why most roundups are useless. A forecast notification pushes you a model prediction for later. A live alarm watches real anemometer readings and fires only when the wind crosses your threshold now. Public forecast models routinely miss by 5+ knots (ECMWF verification, 2024), so the two are not the same tool.
To make this list, an app has to do four things. One: trigger on live wind-station data, not a forecast. Two: let you set a real min/max range plus gust and direction filters, so you only get pinged when it’s rideable for you. Three: ideally ring through silent and Do Not Disturb. Four: not bury the whole thing behind a subscription if it claims to be free.
Only one of the six checks every box. Several check none.
Quick comparison
| App | Alarm type | Live or forecast | Cuts DND/Silent | Min/max/gust/direction | Alarm cost |
|---|---|---|---|---|---|
| WindUp | Live wind alarm | ✅ Live stations | ✅ Yes | ✅ All four | Free |
| WindAlert | Live alarm | ✅ Live (Tempest) | ❌ No | 🔒 Premium | 🔒 Paywalled |
| iKitesurf | Live alarm | ✅ Live (Tempest) | ❌ No | 🔒 Premium | 🔒 Paywalled |
| Windy | Forecast push only | ⚠️ Forecast | ❌ No | ❌ None | No live alarm |
| Windfinder | Forecast push only | ⚠️ Forecast | ❌ No | ⚠️ Limited | No live alarm |
| PredictWind | Forecast push only | ⚠️ Forecast | ❌ No | ❌ None | No live alarm |
The pattern jumps out once it’s in a grid: the alarm category really has three groups, free, paywalled, and absent. Let’s go through each app.
Which wind alarm apps are free, and which paywall the alert?
Only one of the six gives you a live wind alarm for free: WindUp. WindAlert and iKitesurf both have live alarms running on the Tempest network’s 65,000+ stations, but the actual alarm and the best live data sit behind a paid Premium tier. The remaining three apps have nothing to paywall, because they never built a live alarm to begin with.
This is the single most useful thing to understand before you download anything. An app being “free to install” tells you almost nothing. The question is whether the alarm is free, and for WindAlert and iKitesurf the honest answer is no. You download free, set up your spot, then hit a subscription wall on the one feature you came for.
WindUp inverts that. The live alarm, the gust ceiling, the direction filter, all free, no membership. The trade-off is fewer forecast bells and whistles, which is fine, because that’s not the job a wind alarm is for. See how a free alarm beats a paywalled one in the WindAlert comparison and the iKitesurf comparison.
WindUp - the free live alarm built to break through silent
WindUp is the only app here whose entire reason to exist is the alarm. You pick a live station from 10,000+ worldwide, set your wind range, add a gust ceiling and a direction filter, and it rings the moment real readings cross your line. The part that matters: it cuts through silent and Do Not Disturb using iOS time-sensitive and critical alerts, so a sleeping phone doesn’t cost you the window.
It’s on iOS and Android, free, no subscription, and built by Virtual Verse Studio. The App Store rating sits at 5.0 from a small but growing set of ratings, so it’s early, not yet a household name. We’re being straight about that.
What it doesn’t do: animated forecast maps, model comparison, webcams. That’s deliberate. The full walkthrough of the silent-phone problem is in Never miss the wind on silent, and kiters should read the kitesurfing app breakdown for spot-by-spot setup.
WindAlert and iKitesurf - real alarms, behind a paywall
WindAlert and iKitesurf are the two apps that genuinely compete on the alarm. Both run on WeatherFlow’s Tempest network, 65,000+ proprietary stations (Tempest by WeatherFlow, 2024), so when you’re near a station the live data is excellent. WindAlert pioneered this whole category. iKitesurf is its kite-tuned sibling. The catch is identical for both: the alarm is Premium-only.
So you get the right idea executed by people who’ve done it for years, wrapped in interfaces that feel a few seasons old, gated behind a subscription. Neither cuts through Do Not Disturb either, which means even after you pay, a silenced phone can still swallow the alert.
For an already-paying WindAlert or iKitesurf user with stations dialed in, there’s no reason to switch. For everyone deciding fresh, paying for an alarm that a free app also offers is a hard sell.
Why don’t Windy, Windfinder and PredictWind have a live alarm?
Because they’re forecast apps, and forecasting is a different job. Windy is loved by 800,000+ users for its animated map and four-model comparison (Windy on Google Play, 2024). Windfinder covers 160,000+ forecast spots. PredictWind runs proprietary offshore models. All three are genuinely excellent. None of them watches a live station and rings you when wind hits.
Here’s the thing most lists miss: a forecast notification and a live alarm fail in opposite directions. A forecast can promise 20 knots that never shows. A live alarm can only fire on wind that’s actually blowing. For deciding whether to drive to the beach right now, “is it on?” beats “might it be on?” every time. The forecast apps answer the night-before question beautifully and the 9-a.m. question not at all.
PredictWind earns its $190-330/yr for offshore passage planning, not for catching a local session. The honest stack: plan with a forecast app, then let a live alarm catch the window. The PredictWind vs Windy breakdown digs into the forecast side.
How to set up your wind alarm so it actually fires right
A good alarm is only as good as its filters, and most people set them too loose. The goal is zero false alarms and zero missed sessions. In our experience that takes four numbers, not one. Get them right and the app finds you instead of the other way around.
Pick a live station, not a forecast point
Choose the live wind station closest to your actual launch, not a generic forecast pin a few miles inland. Coastal wind drops fast over land, so an inland reading can be 5 knots off the water. If your home spot has a real anemometer feeding the app, use it.
Set min, max, gust and direction
- Min - your get-going wind. Most kiters run 15 kt; lighter riders and big kites, 12.
- Max - your ceiling, so you’re not alarmed into an overpowered mess.
- Gust - cap it so a gusty, unstable day doesn’t trigger a smooth-day expectation.
- Direction - on-shore or side-on only. Never alarm on offshore wind.
Then put the phone down. A properly filtered alarm should ring rarely and mean it every time. New to the app? Start at the download page and copy these settings for your first spot.
So which wind alarm app should you install?
For most people the decision is simple. If you want a live alarm and you don’t want to pay, WindUp is the only option that fits, free, live, and built to ring through a silenced phone. It’s a young app, not a famous one, but on the specific job of “wake me when it’s on,” it’s the cleanest answer of the six.
If you already pay for WindAlert or iKitesurf and it works, keep it. If you mostly want forecasts, Windy or Windfinder is your app, just know neither will ring you live. And if you sail offshore, PredictWind is worth its price, paired with a free alarm for your home spot.
The meta-point: stop expecting one app to forecast and alarm. Plan with a forecast tool, catch the session with a live alarm.
FAQ
The math is what settles it: of the six, three have no live alarm at all, two lock theirs behind a subscription, and one rings free straight through Do Not Disturb. Match the tool to the job — and stop being your own alarm clock.
