FDR Calculator vs Storm Distance Tracker
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FDR Calculator
Instantly calculate fire danger ratings with professional-grade algorithms. Offers real-time weather data integration, visual danger level displays, and detailed action recommendations for informed fire prevention and management.
- Instant Fire Danger Index calculations
- Real-time weather data integration
- Visual color-coded danger levels
- Detailed action recommendations
- Manual calculator for offline use
- Automatic location detection
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PROFESSIONAL FIRE RISK ASSESSMENT MADE SIMPLE Calculate Fire Danger Ratings instantly with precision and confidence. Designed for fire management professionals, land managers, and safety authorities who need accurate fire risk assessments in the field. WEATHER PRO SUBSCRIPTION UNLOCKS ◆ Real-time weather data integrated directly into FDR calculations ◆ Automatic location detection or search any location worldwide ◆ Complete weather history and forecasts for informed planning ◆ Automatic FDR ratings - weather data updates calculations instantly ◆ No more manual data entry - let Weather Pro do the work REAL-TIME FDR CALCULATION ◆ Instant Fire Danger Index calculations based on weather conditions ◆ Professional-grade algorithms for accurate risk assessment ◆ Visual color-coded danger levels (Blue, Green, Yellow, Orange, Red) ◆ Manual calculator always available for offline use INTERACTIVE GAUGE DISPLAY ◆ Beautiful visual gauge showing current fire danger level ◆ Intuitive interface with easy-to-read results ◆ Tap gauge for detailed action recommendations COMPREHENSIVE ACTION GUIDANCE ◆ Detailed recommendations for each danger level ◆ Fire behavior predictions and suppression strategies ◆ Prevention guidelines and aircraft management protocols ◆ Disaster management procedures for high-risk conditions FLEXIBLE WEATHER INPUT Weather Pro Mode (Subscription): ◆ Automatic real-time weather updates ◆ Current location or custom location search ◆ Historical data and multi-day forecasts ◆ Set-and-forget automated monitoring Manual Calculator: ◆ Temperature, humidity, and wind speed sliders ◆ Days since rain and rainfall amount tracking ◆ Precise manual input options for exact values ◆ Real-time calculation updates as you adjust parameters ◆ Works completely offline PERFECT FOR: ▶ Fire management authorities ▶ Emergency services personnel ▶ Land and forest managers ▶ Agricultural professionals ▶ Safety and risk assessment teams ▶ Anyone responsible for fire prevention planning PRIVACY-FIRST DESIGN: ▶ All calculations performed locally on your device ▶ Minimal data collection - only for weather services when using Weather Pro ▶ Manual calculator works completely offline with no data transmission ▶ Weather Pro data encrypted and secure
Storm Distance Tracker
Measure the distance to a storm by timing the interval between seeing lightning and hearing thunder. This tool uses the difference in the speed of light and sound to provide an estimated distance.
- Calculate storm distance
- Uses lightning and thunder timing
- Calculates based on speed of light and sound
- Simple tap interface
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Calculate the distance of lightning and find out how far away the storm is. This app calculates distance using the difference between the speed of light and sound. Tap a button when you see the lightning and then again when you hear the thunder and the app will tell you how far away it is using a time difference between the two.
Screenshots
Verdict
The clearest difference is ads: FDR Calculator at none against Storm Distance Tracker's shown. Storm Distance Tracker's advantage is review sentiment (33% vs 0%). On price, update cadence, in-app purchases 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
Both are free to download. FDR Calculator sells 2 in-app purchases, starting at $1.99 per month and Storm Distance Tracker sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
FDR Calculator ships an update every 4 months, Storm Distance Tracker every 7 months. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.
| Parameter | FDR Calculator | Storm Distance Tracker |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.7 (101 ratings) — better |
| Positive reviews | 0.0% of reviews | 33.3% of reviews — better |
| Number of ratings | — | 101 — better |
| Update frequency | Every 4 months — better | Every 7 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 35 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Alan Richert | DOUBLE U s.r.o. |
Customer experience
FDR Calculator
Storm Distance Tracker
In-app purchases
FDR Calculator
- Weather Pro (Monthly)3 Days trial$1.991 Month
- Enable Local WeatherFree
Storm Distance Tracker
- Remove ads$1.99
- Remove Ads$2.99
- Remove Ads$4.99
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- Remove Ads$9.99
Questions
Is FDR Calculator free?
Is Storm Distance Tracker free?
Do FDR Calculator or Storm Distance Tracker have ads?
Which is updated more often, FDR Calculator or Storm Distance Tracker?
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