Comparison

Deflection Calculator vs SnoTel Mapper

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

Head to head
About

Deflection Calculator

Calculate tube and roll straightener deflection with this app. Input key parameters like diameter and material properties to get accurate results in inches or millimeters. Access past calculations and machine-specific data.

Highlights
  • Deflection calculation
  • Input outside diameter, roll center, yield, and Young's modulus
  • Output in inches or millimeters
  • Unit selector (imperial/metric)
  • History of past calculations
  • Pre-set roll center values for over 50 machines
  • Pre-set Young's modulus for 6 metals
Features
Read full description

Easily calculate deflection for tube and roll straighteners with Deflection Calculator by Turner Machine. Deflection Calculator takes inputs for 4 parameters: outside diameter, roll center, yield, and Young's modulus. It outputs a deflection in inches or millimeters. A unit selector allows for easy transition between imperial and metric units. Past calculations can be viewed by pressing the History button. For the roll center, as an alternative to the user entering the value, a selector with over 50 machines will apply the correct value for that machine in the specified units. Similarly, the Young's modulus can be input by selecting one of 6 metals. The Machine Data tab shows minimum and maximum tube diameters for machines in the WS, 900, and A series in imperial or metric units. Deflection Calculator avoids the hassle of tables and number-crunching, guaranteeing an accurate result every time!

About

SnoTel Mapper

Features
Read full description

SnoTel Mapper puts real-time snow data from 900+ SNOTEL weather stations in your pocket. Track snow conditions, avalanche forecasts, and weather data for safer backcountry adventures. Perfect for backcountry skiers, snowboarders, snowshoers, winter hikers, and anyone who needs accurate snowpack information for winter recreation. Free Features: • Interactive maps with all SNOTEL stations across the United States • Current and historical snow depth data with 20-year averages • Temperature and precipitation tracking • Avalanche forecast overlays with current danger ratings • Unlimited favorite stations with smart offline caching • Beautiful charts and graphs showing snow depth trends • Light and dark themes for any viewing preference • Offline access for backcountry use without cell service • Historical data comparisons to last year and averages Pro Features: • Hourly data updates (vs. daily summaries) for precise tracking • 3-day NOAA point forecasts for each station location • Snowfall prediction gauges showing expected accumulation • Top 3 site SNOTEL alerts for your most-used stations • Multi-model weather predictions with precipitation and temperature • Nearby webcam feeds to verify actual ground conditions • Pin primary station to open automatically on launch BEAUTIFUL & INTUITIVE Modern design with smooth animations, customizable views, and dark mode support. Reorder your favorite stations, export favorites for backup, and pin your primary station for quick access. Smart clustering on maps makes it easy to navigate hundreds of stations. PERFECT FOR • Backcountry skiers and snowboarders planning safer trips with current conditions • Winter campers monitoring weather patterns and snow accumulation • Weather enthusiasts tracking snowpack development throughout the season • Mountain guides and avalanche professionals accessing official NRCS data KEY BENEFITS • Complete Coverage: Access over 900 SNOTEL stations plus SNOW and SCAN monitoring sites • Official Data: Direct access to USDA NRCS sources—the same data used by avalanche forecasters • Lightning Fast: Smart caching ensures instant load times and reliable access in poor connectivity • Privacy First: Zero personal data collection. Location used only for map centering, never stored • Continuously Improving: Regular updates bring new features and performance improvements • Community Input! TRUSTED DATA SOURCES Official data from USDA Natural Resources Conservation Service (NRCS) SNOTEL network, NOAA National Weather Service, and regional avalanche information centers via Avalanche.org. The same authoritative data sources used by avalanche forecasters, backcountry professionals, and water resource managers. USE CASES • Plan backcountry ski tours with current snow depth and avalanche danger ratings • Check conditions before snowshoeing or winter hiking trips • Monitor snowpack development for water resource tracking • Compare current season to historical averages and last year's conditions • Track temperature trends and precipitation patterns Whether you're planning a backcountry mission, tracking water resources, monitoring winter weather patterns, or just love snow data, SnoTel Mapper is your essential companion for mountain conditions. SAFETY NOTICE This application displays data from USDA NRCS and other sources for informational purposes only. Data availability and accuracy may vary. Always consult official sources, check current avalanche forecasts from regional avalanche centers, and use proper judgment when making decisions about backcountry travel and winter recreation. The developers assume no responsibility for decisions made based on information provided by this application. Pro features available via subscription. Terms apply. Privacy Policy: https://psithurismlabs.com/privacy.html Terms of Service: https://psithurismlabs.com/terms.html EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Deflection Calculator4 screens
SnoTel Mapper4 screens

Verdict

The call

The clearest difference is price: Deflection Calculator at Free against SnoTel Mapper's $2.49. Deflection Calculator also leads on in-app purchases (none vs 2) and iOS requirement (14.0 vs 17.6). On update cadence, ads and device support 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

Deflection Calculator is free to download; SnoTel Mapper costs $2.49 up front. SnoTel Mapper sells 2 in-app purchases, starting at $2.99 per month. Deflection Calculator asks for nothing beyond the download.

UpkeepUpdate frequency

Deflection Calculator ships an update every 3 months, SnoTel Mapper every 6 weeks. The most recent releases landed on September 19, 2026 and September 11, 2026 respectively.

Scorecard3 real differences · 6 level
Deflection Calculator versus SnoTel Mapper: the parameters behind the verdict, then further details
ParameterDeflection CalculatorSnoTel Mapper
PriceFree — better$2.49
Rating5.0 (4 ratings) — better—
Number of ratings4 — better—
Update frequencyEvery 3 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better17.6
Further details — not scored
Size2 MB82 MB
Age rating4+4+
DeveloperNeill MclachlanJason Flaherty

In-app purchases

None

Deflection Calculator

No in-app purchases

2 purchases

SnoTel Mapper

Subscriptions2
  • Premium Monthly Subscription7 Days trial$2.991 Month
  • Premium Yearly Subscription$24.991 Year

Questions

Is Deflection Calculator free?
Deflection Calculator is free to download, with no in-app purchases.
Is SnoTel Mapper free?
SnoTel Mapper costs $2.49, and also offers in-app purchases.
Do Deflection Calculator or SnoTel Mapper have ads?
Neither Deflection Calculator nor SnoTel Mapper shows ads.
Which is updated more often, Deflection Calculator or SnoTel Mapper?
Deflection Calculator ships an update every 3 months, and SnoTel Mapper every 6 weeks. Most recently, Deflection Calculator was updated on September 19, 2026 and SnoTel Mapper on September 11, 2026.

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