Comparison

FDR Calculator vs FireSignal

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

FireSignal

Features
Read full description

FireSignal shows wildfires in Europe, detected by weather satellites. MOST OF THE APP WORKS WITHOUT AN ACCOUNT The map is free and needs no sign-in. Open the app, tap "Map", and you see all current fire detections in Europe. Tap any fire for details. WHY SIGN-IN EXISTS An account is only needed to follow a place (a campsite, a home address) and to receive notifications about it. Everything else is open. HOW TO SIGN IN WITH THE DEMO ACCOUNT 1. Tap "Account" in the tab bar, then "Sign in". 2. Enter the e-mail address below and tap "Send me a code". 3. On the next screen ("Code from your email"), enter the 6-digit code below and tap "Sign in". Normally that code is e-mailed to the user. For this account the code is fixed, so no mailbox is needed and the code does not expire. You will still see the message that a code was sent; that is expected. ADVERTISING AND TRACKING The free version shows a single banner ad at the bottom of the Map, Places and Account tabs (Google AdMob). No interstitials or other full-screen ads. Plus subscribers see no ads. Before any ad is requested, Google's consent message (UMP) is shown; on iOS the App Tracking Transparency request follows right after it. Both appear about 6 seconds after you open the Map tab on a device that has not answered them before; they are deliberately not shown at launch, so that someone opening a wildfire app in a hurry is not stopped by a dialog. The advertising identifier is only used if the user allows tracking. Consent can be changed at any time under Settings, "Privacy settings for ads". LOCATION The app never asks for location on launch. It asks only when you tap "Use my current location" while adding a place, and it requests reduced (coarse) accuracy only. The location stays on the device and is not sent to our servers. NOTIFICATIONS An alert requires a real wildfire to be detected within the radius of a saved place, so it cannot be triggered on demand during review. Notification settings are under Account. If you would like us to send a test notification to a device during the review, e-mail us and we will do so within the hour. SUBSCRIPTION FireSignal Plus is an auto-renewable subscription, EUR 5.99 monthly or EUR 29.99 yearly. It adds immediate alerts, up to five places, a wind warning and tomorrow's fire danger. The map and one place remain free. The demo account deliberately does NOT have Plus, so that you can see the free tier and the paywall exactly as a new user does, and so that you can test the purchase itself. To review the paid features, open "Account" and tap the Plus card. A sandbox purchase is accepted and unlocks Plus immediately on this account; our server verifies the signed transaction against Apple's root certificate. If the sandbox purchase does not go through for any reason, e-mail us and we will enable Plus on the demo account within the hour so you can still review those screens. SAFETY The app states clearly, in the description and in the app itself, that satellite detection is not an alarm system and does not replace emergency services.

Screenshots

FDR Calculator4 screens
FireSignal4 screens

Verdict

The call

The clearest difference is in-app purchases: FireSignal at none against FDR Calculator's 1. FireSignal also leads on update cadence (every 3 days vs every 4 months). FDR Calculator's advantage is ads (none vs shown). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. FDR Calculator sells 1 in-app purchase, starting at $1.99 per month. FireSignal asks for nothing beyond the download.

UpkeepUpdate frequency

FDR Calculator ships an update every 4 months, FireSignal every 3 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 5 level
FDR Calculator versus FireSignal: the parameters behind the verdict, then further details
ParameterFDR CalculatorFireSignal
PriceFreeFree
Positive reviews0.0% of reviews—
Update frequencyEvery 4 monthsEvery 3 days — better
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size35 MB7 MB
Age rating4+4+
DeveloperAlan RichertRutger Harder

In-app purchases

1 purchases

FDR Calculator

Subscriptions1
  • Weather Pro (Monthly)3 Days trial$1.991 Month
None

FireSignal

No in-app purchases

Questions

Is FDR Calculator free?
FDR Calculator is free to download, with in-app purchases available.
Is FireSignal free?
FireSignal is free to download, with no in-app purchases.
Do FDR Calculator or FireSignal have ads?
FireSignal shows ads; FDR Calculator does not.
Which is updated more often, FDR Calculator or FireSignal?
FDR Calculator ships an update every 4 months, and FireSignal every 3 days. Most recently, FDR Calculator was updated on November 6, 2026 and FireSignal on October 31, 2026.

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