Comparison

Flash Boom vs Flash Weather

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Flash Boom

This app estimates the distance to lightning strikes by timing the interval between seeing the flash and hearing the thunder. It provides a simple, quick way to gauge your proximity to a storm and advises taking cover if you are within 5 miles.

Highlights
  • Lightning distance estimation
  • Flash and thunder timing
  • Distance in miles and kilometers
  • Safety advisory for close lightning
  • Simple tap interface
Features
Read full description

Definition: The purpose of Flash Boom is simple. It will give you an estimate of how far away lightning is. The rule of thumb says to allow about 5 seconds for each mile (3 seconds for each kilometer). In reality it is more like 4.72 seconds per mile and 2.99 seconds per kilometer. For more details, please visit http://www.wikihow.com/Calculate-the-Distance-from-Lightning Control: Tap the FLASH button when you see the lightning. The button will change to BOOM. Tap the BOOM button when you hear the thunder. Thunder will usually not travel more than 15 miles (24 kilometers). Note: If you are less than 5 miles from the lightning, please take cover. Credit: The original Flash Boom program I knew of was writen by Kim Moelgaard for the Palm OS. I adapted the concept (without access to the code) to the iPhone. Enjoy!

About

Flash Weather

Get precise, AI-powered weather alerts for lightning, heat risk, and radar. Receive instant notifications tailored to your location, with customizable settings for safety and planning outdoor activities. Includes hourly and 7-day forecasts.

Highlights
  • AI lightning prediction
  • Real-time heat risk metrics
  • Current and future radar maps
  • Smart push notifications
  • Hourly and 7-day forecasts
  • Customizable warning settings
Features
Currently charting
Read full description

FLASH predicts lightning before the first strike. With a patented algorithm infused with Deep Learning, you'll always know when to head inside, and when it's safe to head back out. Whether you are outdoors for work, training, sports, or recreation, FLASH is your edge against the elements. LIGHTNING PREDICTION LIKE NEVER BEFORE Our patented algorithm, infused with deep learning, forecasts where lightning will be before it hits. - Live Activities let you track the storm from your Lock Screen - FirstStrike tells you when the strike will be in your backyard - All Clear gives a simple yes/no answer to "Can we go back outside?" - 5 Hour Lightning Forecast gives extra time to decide on afternoon & evening plans CURRENT AND FUTURE RADAR High resolution current and future radar with lightning, watches and warnings, plus Flash Weather's FirstStrike, All Clear, and Lightning Probability forecast maps. - Up to the minute current radar and current lightning - 18-hour future radar in 15-minute increments, updating hourly - FirstStrike, All Clear, and Lightning Probability maps updating every 2 minutes SMART PUSH NOTIFICATIONS Get alerted when lightning is detected or forecast near you. - Forecast-based warnings before a strike - Customizable lightning proximity alerts for every saved location NFHS-STANDARD, EXCLUSIVE HEAT AND WBGT FORECASTING Plan your day with real-time WBGT readings, critical for outdoor safety. FLASH also forecasts heat stress 7 days out so you can avoid dangerous conditions before they start. - Live WBGT values for your exact location - Heat risk color coding for easy interpretation - 7-day forward-looking heat stress outlook HOURLY AND 7-DAY FORECASTS High and low temperatures, precipitation chance and amount, wind, dew point, cloud cover, and UV index. - Hourly and daily forecasts out 7 days - Graphical temperature, precipitation, and wind outlooks Developed by Flash Weather. Learn more at flashweather.ai Questions or suggestions: support@flashweather.ai Some features require a Flash Premium subscription. After a 7-day free trial, Premium is $3.99/mo or $39.99/yr. Privacy Policy: https://flashweather.ai/privacy/ Terms of Service: https://flashweather.ai/legal/ Auto-renewable subscriptions are governed by Apple's standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Flash Boom4 screens
Flash Weather4 screens

Verdict

The call

The clearest difference is rating: Flash Boom at 5.0 against Flash Weather's 4.4. Flash Boom also leads on in-app purchases (none vs 2) and iOS requirement (10.3 vs 15.0). Flash Weather's advantage is ratings volume (105 vs 1) and update cadence (fortnightly vs every 6 weeks). On price, review sentiment, ads and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Flash Weather sells 2 in-app purchases, starting at $3.99 per month. Flash Boom asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Flash Boom holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Flash Weather has 105 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 60% of Flash Boom's written reviews are positive against 65% of Flash Weather's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Flash Boom ships an update every 6 weeks, Flash Weather fortnightly. The most recent releases landed on October 13, 2026 and October 25, 2026 respectively.

Scorecard6 real differences · 5 level
Flash Boom versus Flash Weather: the parameters behind the verdict, then further details
ParameterFlash BoomFlash Weather
PriceFreeFree
Rating5.0 (1 ratings) — better4.4 (105 ratings)
Positive reviews60.0% of reviews64.6% of reviews — better
Number of ratings1105 — better
Update frequencyEvery 6 weeksFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
Best chart rank—#129 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.3 — better15.0
Further details — not scored
Size17 MB72 MB
Age rating4+4+
DeveloperEdward DanleyFlash Scientific Technology

Customer experience

Flash Boom

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews10 reviews
Positive60.0%
Neutral0.0%
Negative40.0%

Flash Weather

All ratings103 ratings
Positive84.5%
Neutral3.9%
Negative11.7%
Written reviews48 reviews
Positive64.6%
Neutral6.3%
Negative29.2%

In-app purchases

None

Flash Boom

No in-app purchases

2 purchases

Flash Weather

Subscriptions2
  • Flash Premium Monthly7 Days trial$3.991 Month
  • Flash Premium Yearly7 Days trial$39.991 Year

Questions

Is Flash Boom free?
Flash Boom is free to download, with no in-app purchases.
Is Flash Weather free?
Flash Weather is free to download, with in-app purchases available.
Which has better reviews, Flash Boom or Flash Weather?
Flash Boom is rated higher. Flash Boom averages 5.0 out of 5 from 1 ratings, while Flash Weather averages 4.4 from 105 ratings.
Do Flash Boom or Flash Weather have ads?
Neither Flash Boom nor Flash Weather shows ads.
Which is updated more often, Flash Boom or Flash Weather?
Flash Boom ships an update every 6 weeks, and Flash Weather fortnightly. Most recently, Flash Boom was updated on October 13, 2026 and Flash Weather on October 25, 2026.

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