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 in your pocket — 900+ USDA SNOTEL stations across the western United States, plus British Columbia snow pillows. Track snow conditions, avalanche forecasts, terrain, and weather for safer backcountry trips. Built for skiers, snowboarders, snowshoers, winter hikers, and anyone who needs accurate snowpack information. Free Features: • Maps of SNOTEL, SNOW, and SCAN sites, plus BC Automated Snow Weather Stations • Current and historical snow depth, with averages and last-year comparisons • Temperature and precipitation • Avalanche forecast overlays with current danger ratings • Terrain overlays: aspect, hillshade, and slope • Unlimited favorites with offline caching • Charts of snow depth trends, and shareable station cards • Light, dark, and Neon themes; metric or imperial units • Apple Watch: top 3 favorites with depth, temperature, and 24-hour change • Offline access when you are out of cell service Pro Features: • Hourly data instead of daily summaries • Point forecasts on each station, or long-press the map (NOAA in the US, Canada HRDPS for BC) • Save up to 10 weather spots and reopen their forecasts • Morning Brief: compare your top 3 favorites, with a daily notification at a time you choose • Snowfall Watch: flag favorites that gain an amount you set over 8, 12, or 24 hours • Storm totals: 24/48/72-hour depth change, plus daily high and low temperatures • Snowfall prediction gauges • Multi-model forecasts for precipitation and temperature • Nearby webcams to check ground conditions Reorder favorites, export a backup, and share a conditions card. Map clustering keeps hundreds of stations easy to browse. Your first three favorites refresh hourly and stay on Apple Watch. Perfect for backcountry skiers and snowboarders, winter campers, weather enthusiasts, and guides who want official station data before they leave the trailhead. • Coverage: 900+ SNOTEL stations, plus SNOW, SCAN, and BC snow pillows • Official networks used by avalanche forecasters and water managers • Smart caching for fast loads and offline use • No personal data collection. Location only centers the map and is never stored • Regular updates shaped by community feedback Data from USDA NRCS SNOTEL, BC Snow Survey / River Forecast Centre (ASWS), NOAA, Environment and Climate Change Canada (HRDPS), USGS 3DEP terrain, and regional avalanche centers via Avalanche.org. Plan a tour with snow depth and avalanche danger, check a trail before you go, compare this season with last year, and follow storms as they add up. SAFETY NOTICE Data from USDA NRCS, British Columbia, and other sources is for information only. Availability and accuracy vary. Check official forecasts from regional avalanche centers and use your own judgment. The developers are not responsible for decisions made from this app. Pro features require a 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). On update cadence, ads, 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

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 2 months. Both last shipped on October 24, 2026.

Scorecard2 real differences · 7 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 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS14.0 — better15.6
Further details — not scored
Size2 MB71 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 2 months. Most recently, Deflection Calculator was updated on October 24, 2026 and SnoTel Mapper on October 24, 2026.

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