Comparison

Snowtam vs ATSU

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

Head to head
About

Snowtam

This app assists pilots in cold weather by decoding SNOWTAM and MOTNE reports. It also offers a tool to calculate cold temperature altitude adjustments based on Transport Canada's charts.

Highlights
  • SNOWTAM decoder
  • MOTNE decoder
  • Cold temperature correction tool
  • ICAO airport code database
  • Runway condition code decoding
  • Altitude adjustment calculations
Features
Currently charting
Read full description

Snowtam provides pilots with the following useful collection of tools for cold weather conditions: SNOWTAM decoder, MOTNE decoder and a cold temperature correction tool. * SNOWTAM decoder A quick and easy decoder for any of the 16 fields provided in a Snow Notification Report. * An in-built database with over 12,000 ICAO airport codes, together with elevation data (please consult application help page) * MOTNE decoder Runway condition MOTNE codes, which are provided with METARs, can quickly be decoded with an intuitive spin dial interface, ensuring that invalid codes cannot be entered. * Cold temperature corrections Based on Transport Canada's widely available Altitude Correction Chart, this utility uses a formula to quickly calculate cold temperature altitude adjustments. The application comes with detailed help information for each utility.

About

ATSU

This app provides comprehensive aviation tools for flight planning and operational support. It features AI-driven decision assistance, detailed runway analysis, and weather decoding to enhance pilot situational awareness and safety.

Highlights
  • AI-assisted aviation decision making
  • Detailed runway and wind analysis
  • Airport information and offline notes
  • In-flight calculators and converters
  • SIGMET plotting and weather charts
  • NOTAM and METAR/TAF decoding
  • Hands-free audio weather updates
Features
Read full description

Plan smarter with ATSU — the AI-powered flight briefing and EFB companion built for pilots. Get instant METAR, TAF, NOTAM, and SIGMET decoding, AI-assisted dispatch guidance, and every essential flight tool in one app. Flight Planning & Operational Support • ADA- AI Supported Aviation Decision Assistant introduced • Auto-generated Part A flight planning suggestions • Detects short and narrow runways, calculates maximum crosswind limits • Identifies weather-related threats during planning • Built-in Threat module for enhanced situational awareness Runway Intelligence • Detailed wind component analysis (headwind & crosswind) • Runway slope, elevation, surface type (ASP, CON) • Runway length, width, displaced threshold data Airport Essentials • Airport frequencies and airport maps • Offline/online note sharing with voting system for pilot feedback • In-Flight Tools • Approach path and temperature correction • Wind component calculator, fuel uplift calculator, logbook summation, unit converters ADA Suite (Airmet Detection & Awareness) • SIGMET plotting (thunderstorm, icing, turbulence, volcanic ash, and more) • Great circle flight planner • Prognostic and significant weather charts NOTAM & Weather Decoder • Smart NOTAM classification • METAR/TAF decoding • Runway condition/braking action decoder (ICAO and Russian formats) Meteogram • Visual meteogram charts showing weather trends and forecasts Drive Mode • Listen to latest METARs and TAFs • Audio mode similar to ATIS • Designed for hands-free use Night Time Calculator • Automatically calculates night flight time • Based on great circle route Dangerous Goods Module • Dangerous goods risk evaluation • Firefighting and spill procedures • Drill codes and additional safety considerations

Screenshots

Snowtam4 screens
ATSU4 screens

Verdict

The call

The clearest difference is review sentiment: ATSU at 97% against Snowtam's 43%. ATSU also leads on rating (5.0 vs 1.8) and update cadence (every 3 months vs every 7 months). Snowtam's advantage is chart position (#27 vs unranked) and iOS requirement (6.0 vs 18.0). On price, ratings volume, ads and in-app purchases 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

Snowtam costs $3.99 and ATSU $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

ATSU holds the better App Store score, 5.0 against 1.8. Both are backed by a comparable volume of ratings — 5 and 3 respectively. Written reviews point the same way: 43% of Snowtam's written reviews are positive against 97% of ATSU's.

UpkeepUpdate frequency

Snowtam ships an update every 7 months, ATSU every 3 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

Scorecard5 real differences · 6 level
Snowtam versus ATSU: the parameters behind the verdict, then further details
ParameterSnowtamATSU
Price$3.99$3.99
Rating1.8 (5 ratings)5.0 (3 ratings) — better
Positive reviews43.5% of reviews97.4% of reviews — better
Number of ratings5 — better3
Update frequencyEvery 7 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#27 — better—
DevicesiPhone, iPodiPhone, iPad
Requires iOS6.0 — better18.0
Further details — not scored
Size3 MB52 MB
Age rating4+4+
DeveloperBrendan WholihanMehmet Tufan

Customer experience

Snowtam

All ratings5 ratings
Positive20.0%
Neutral0.0%
Negative80.0%
Written reviews23 reviews
Positive43.5%
Neutral0.0%
Negative56.5%

ATSU

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews38 reviews
Positive97.4%
Neutral0.0%
Negative2.6%

In-app purchases

None

Snowtam

No in-app purchases

None

ATSU

No in-app purchases

Questions

Is Snowtam free?
Snowtam costs $3.99, with no in-app purchases.
Is ATSU free?
ATSU costs $3.99, with no in-app purchases.
Which has better reviews, Snowtam or ATSU?
ATSU is rated higher. Snowtam averages 1.8 out of 5 from 5 ratings, while ATSU averages 5.0 from 3 ratings.
Do Snowtam or ATSU have ads?
Neither Snowtam nor ATSU shows ads.
Which is updated more often, Snowtam or ATSU?
Snowtam ships an update every 7 months, and ATSU every 3 months. Most recently, Snowtam was updated on November 6, 2026 and ATSU on November 7, 2026.

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