Comparison

Stair Calculator vs TriangleData

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

TriangleData

This utility app helps you calculate triangle angles and data. It can determine if a corner is 90 degrees by taking measurements and inputting them into the app. You can also use it to calculate right triangle data.

Highlights
  • Calculate triangle angles
  • Check for 90-degree corners
  • Input measurements for calculation
  • Calculate right triangle data
Features
Read full description

Do you need to check it if a corner has 90 degree? Just take a measuring from the corner to some point on the first side, then do the same on another side and then, take a measuring between these points and pull all 3 measuring in to this app, the app will calculate all angles for you. Or you can just calculate right triangle data. Feel free to use it as you want.

Screenshots

Stair Calculator3 screens
TriangleData3 screens

Verdict

The call

The clearest difference is in-app purchases: TriangleData at none against Stair Calculator's 2. TriangleData also leads on update cadence (every 8 days vs every 3 months) and iOS requirement (12.0 vs 15.0). Stair Calculator's advantage is review sentiment (21% vs 0%). On price, 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

Both are free to download. Stair Calculator sells 2 in-app purchases, starting at $9.99 per year. TriangleData asks for nothing beyond the download.

UpkeepUpdate frequency

Stair Calculator ships an update every 3 months, TriangleData every 8 days. Both last shipped on October 24, 2026.

Scorecard5 real differences · 5 level
Stair Calculator versus TriangleData: the parameters behind the verdict, then further details
ParameterStair CalculatorTriangleData
PriceFreeFree
Rating4.1 (740 ratings) — better—
Positive reviews21.4% of reviews — better0.0% of reviews
Number of ratings740 — better—
Update frequencyEvery 3 monthsEvery 8 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size1 MB25 MB
Age rating4+4+
DeveloperPhan Nhat ĐangKiryl Sabko

Customer experience

Stair Calculator

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

TriangleData

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

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

TriangleData

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
None

TriangleData

No in-app purchases

Questions

Is Stair Calculator free?
Stair Calculator is free to download, with in-app purchases available.
Is TriangleData free?
TriangleData is free to download, with no in-app purchases.
Do Stair Calculator or TriangleData have ads?
Neither Stair Calculator nor TriangleData shows ads.
Which is updated more often, Stair Calculator or TriangleData?
Stair Calculator ships an update every 3 months, and TriangleData every 8 days. Most recently, Stair Calculator was updated on October 24, 2026 and TriangleData on October 24, 2026.

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