Comparison

Stair Calculator vs RedX Decks

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

Head to head
About

Stair Calculator

This app calculates essential parameters for stair construction, offering flexibility in input and providing multiple step set options. It supports various units and allows results to be easily copied.

Highlights
  • Calculate stair construction parameters
  • Flexible input for Run or Total Run
  • Determine largest and smallest step sets
  • Support for various units
  • Copy results to clipboard
Features
Read full description

Stair Calculator helps you calculate and compare staircase dimensions. FEATURES • Calculate using Run, Total Run, or Stair Angle • Enter a specific number of Runs or explore all calculated options • Support Metric and Imperial units • View detailed measurements and stair diagrams • Export results as a PDF or image • Copy results to the clipboard IMPORTANT Results are generated based on user-provided values and general calculation models. The app is intended for reference and educational purposes only. Please verify all measurements, local building requirements, and safety standards before actual construction. SUBSCRIPTION This subscription package offers unlimited access to all app features throughout the subscription period. • Payment will be charged to your Apple Account at confirmation of purchase. • The subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. • Your Apple Account will be charged for renewal within 24 hours before the end of the current period, and the renewal cost will be identified. • Subscriptions may be managed and auto-renewal may be turned off in your Apple Account Settings after purchase. • Any unused portion of a free trial period, if offered, will be forfeited when you purchase a subscription, where applicable. PRIVACY POLICY https://13520178.github.io/StairCalc/policy.html TERMS OF USE https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ CONTACT If you have any questions or suggestions, please contact us. Email: phannhatd@gmail.com

About

RedX Decks

Design and visualize complex deck structures, including roofs and stairs, with automatic framing and structural calculations. Generate professional, permit-ready blueprints and detailed material lists for efficient construction.

Highlights
  • 3D deck and roof design
  • Automatic framing layouts
  • Structural calculations
  • Permit-ready blueprints
  • Material and cut lists
  • 3D visualization and renders
Features
Read full description

Design decks. Add roofs. Generate permit ready blueprints. RedX Decks is powerful deck design software for contractors, designers, and serious DIY builders. Create structurally sound decks, add roof-over-deck systems with beams and posts, and generate professional construction drawings in minutes. Build straight, wraparound, gazebo, L-shaped, U-shaped, freestanding, multi-level, or fully custom decks with automatic framing layouts and structural calculations. Decks With Roof Structures Design: • Roof over deck systems • Post and beam covered decks • Gazebo roofs • Decks with integrated stairs and railings • Multi-level structural framing Create complete deck and roof framing plans including beams, joists, posts, and railing systems. Permit Ready Blueprints Generate professional PDF construction drawings: • Joist and beam layout plans • Elevation blueprints • Framing layouts • Post and railing layouts • Stair stringer plans • Structural load calculations • Detailed material and cut lists Perfect for permit applications, contractor submissions, inspections, and client presentations. Automatic Structural & Framing Layout RedX automatically calculates: • Deck tributary areas • Beam sizing logic • Joist and beam placement • Load distribution • Structural checks Automatically generate: • Beam layouts • Joist layouts • Divider boards • Joist blocking • Post spacing • Stair framing Adjust spacing, deck load, materials, and wood species to match your project requirements. 3D Visualization & High-Quality Renders View your deck and roof structure in realistic 3D. Rotate, zoom, and inspect every component before building. Export high-resolution render images for client presentations, marketing, social media, or permit documentation. Complete Material & Cut Lists Get accurate: • Lumber quantities • Cut lists • Fastener estimates • Material summaries Reduce waste and build with confidence. Built for decks attached to a house or fully freestanding structures — from simple backyard builds to covered roof-over-deck systems. Download RedX Decks and start creating permit ready deck and roof blueprints today. Terms of Use (EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ RedX Apps Terms of Service https://www.redxapps.com/terms-of-service In-App Purchases Available Premium Monthly and Yearly subscriptions unlock advanced features. Payment is charged to your iTunes account and renews automatically unless turned off at least 24 hours before the end of the current period. Manage subscriptions in your App Store settings. Current pricing starts at $6.99 USD/month or $59.99 USD/year. Prices may vary by region and are subject to change. Active subscriptions cannot be canceled during the billing period.

Screenshots

Stair Calculator3 screens
RedX Decks4 screens

Verdict

The call

The clearest difference is update cadence: RedX Decks at every 10 days against Stair Calculator's every 3 months. RedX Decks also leads on rating (4.3 vs 4.1) and review sentiment (31% vs 21%). 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

Both are free to download. Stair Calculator sells 2 in-app purchases, starting at $9.99 per year and RedX Decks sells 9 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

RedX Decks holds the better App Store score, 4.3 against 4.1. Both are backed by a comparable volume of ratings — 738 and 521 respectively. Written reviews point the same way: 21% of Stair Calculator's written reviews are positive against 31% of RedX Decks's.

UpkeepUpdate frequency

Stair Calculator ships an update every 3 months, RedX Decks every 10 days. The most recent releases landed on September 18, 2026 and September 21, 2026 respectively.

Scorecard3 real differences · 7 level
Stair Calculator versus RedX Decks: the parameters behind the verdict, then further details
ParameterStair CalculatorRedX Decks
PriceFreeFree
Rating4.1 (738 ratings)4.3 (521 ratings) — better
Positive reviews21.4% of reviews30.8% of reviews — better
Number of ratings738 — better521
Update frequencyEvery 3 monthsEvery 10 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size1 MB177 MB
Age rating4+4+
DeveloperPhan Nhat ĐangRedX Technology Inc

Customer experience

Stair Calculator

All ratings738 ratings
Positive77.2%
Neutral5.0%
Negative17.8%
Written reviews28 reviews
Positive21.4%
Neutral7.1%
Negative71.4%

RedX Decks

All ratings521 ratings
Positive82.7%
Neutral3.1%
Negative14.2%
Written reviews39 reviews
Positive30.8%
Neutral5.1%
Negative64.1%

Bugs and requests

Stair Calculator

Reported bugs

2 issues
  • Subscription numbers don't add up
  • Doesn't provide promised features after purchase

Requested features

3 requests
  • Option to uninstall app
  • Ability to calculate run based on rise and landing space
  • Provide more detailed diagrams and visuals

RedX Decks

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Stair Calculator

Subscriptions1
  • Annual Premium Package7 Days trial$9.991 Year
One-time1
  • Unlock all features$5.99
9 purchases

RedX Decks

Subscriptions6
  • RedX Decks Pro$6.991 Month
  • RedX Apps Pro++ Monthly$9.991 Month
  • RedX Apps Pro++$59.991 Year
Show 3 more
  • RedX Decks Pro7 Days trial$59.991 Year
  • RedX Decks Pro7 Days trial$69.991 Year
  • RedX Apps Bundle1 Year trial2 variants$179.991 Year
One-time3
  • 20 Render Credits$9.99
  • 100 Render Credits$29.99
  • 200 Render Credits$44.99

Questions

Is Stair Calculator free?
Stair Calculator is free to download, with in-app purchases available.
Is RedX Decks free?
RedX Decks is free to download, with in-app purchases available.
Which has better reviews, Stair Calculator or RedX Decks?
RedX Decks is rated higher. Stair Calculator averages 4.1 out of 5 from 738 ratings, while RedX Decks averages 4.3 from 521 ratings.
Do Stair Calculator or RedX Decks have ads?
Neither Stair Calculator nor RedX Decks shows ads.
Which is updated more often, Stair Calculator or RedX Decks?
Stair Calculator ships an update every 3 months, and RedX Decks every 10 days. Most recently, Stair Calculator was updated on September 18, 2026 and RedX Decks on September 21, 2026.

Other comparisons