Comparison

Right Angle vs Trigonometric Calculation

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

Head to head
About

Right Angle

This app calculates triangles and segments of circles. It supports various angle input formats and offers solutions for oblique triangles and circle segments with optional add-ons. A right triangle calculator is included for free.

Highlights
  • Triangle solver
  • Circle segment calculator
  • Multiple angle units (degrees, radians, DMS, grade, x/12)
  • Oblique triangle solver (add-on)
  • Circle segment solver (add-on)
  • Free right triangle calculator
Features
Read full description

Right Angle is a calculator built for carpenters, builders, surveyors, machinists, and engineers — anyone who needs to solve a triangle, a trapezoid, or a circle without reaching for a notepad and the law of sines. Enter any valid combination of sides and angles and Right Angle solves the rest, including perimeter and area. The right triangle calculator is included for free; every other shape unlocks with a one-time Pro purchase or subscription. SHAPES • Right triangle (free) • Oblique triangle • Isosceles, right, and general trapezoids • Full circle — enter radius, diameter, or circumference • Segment of a circle ANGLE FORMATS • Decimal degrees • Radians • Degrees / minutes / seconds (DMS) • Percent grade • Pitch (x-over-12) LENGTH FORMATS • Decimal — the original, unitless entry. Best for metric. • Feet, inches & fractions — type values like 2' 5 1/2". • Inches & fractions — type values like 40 1/2". Pick a fraction precision from 1/2 down to 1/64 inch. Inputs and outputs both use the format you choose, and you can switch any time from Settings. DESIGNED FOR THE JOB SITE • A custom on-screen keyboard puts the symbols you need — feet, inches, fraction slash, degree, prime, double-prime — one tap away. • Helpful errors when an input combination can't be solved, instead of silent failures. • Available in English and Spanish — iOS picks the language to match your device. • Full VoiceOver support across the keyboard, input fields, shape diagrams, and results. Animations respect the Reduce Motion setting. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy: http://rightangleapp.com/privacy.html

About

Trigonometric Calculation

Features
Read full description

This is a calculation application for finding angles and side lengths of triangles. 1 We would appreciate a review if there are any problems such as calculation glitches. 2 I hope you will use this application for simple calculations. Please understand that we cannot be held responsible for any impact or disadvantage related to the quality of production activities caused by the calculations in this application.

Screenshots

Right Angle4 screens
Trigonometric Calculation4 screens

Verdict

The call

The clearest difference is in-app purchases: Trigonometric Calculation at none against Right Angle's 9. Trigonometric Calculation also leads on iOS requirement (15.5 vs 26.0). Right Angle's advantage is ads (none vs shown) and update cadence (every 5 days vs every 6 weeks). On price 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. Right Angle sells 9 in-app purchases, starting at $2.99 per month. Trigonometric Calculation asks for nothing beyond the download.

UpkeepUpdate frequency

Right Angle ships an update every 5 days, Trigonometric Calculation every 6 weeks. The most recent releases landed on July 17, 2026 and September 27, 2026 respectively.

Scorecard4 real differences · 6 level
Right Angle versus Trigonometric Calculation: the parameters behind the verdict, then further details
ParameterRight AngleTrigonometric Calculation
PriceFreeFree
Rating3.9 (30 ratings) — better—
Positive reviews73.3% of reviews—
Number of ratings30 — better—
Update frequencyEvery 5 days — betterEvery 6 weeks
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPod
Requires iOS26.015.5 — better
Further details — not scored
Size2 MB5 MB
Age rating4+4+
DeveloperJerry MayersRisako Asai

In-app purchases

9 purchases

Right Angle

Subscriptions2
  • Renews Monthly14 Days trial$2.991 Month
  • Renews Yearly1 Month trial$14.991 Year
One-time7
  • Small Tip$2.99
  • Medium Tip$4.99
  • Segments Calculator$5.99
Show 4 more
  • Oblique Triangle Calculator$5.99
  • Segment & Oblique Triangle$6.99
  • Large Tip$9.99
  • Huge Tip$29.99
None

Trigonometric Calculation

No in-app purchases

Questions

Is Right Angle free?
Right Angle is free to download, with in-app purchases available.
Is Trigonometric Calculation free?
Trigonometric Calculation is free to download, with no in-app purchases.
Do Right Angle or Trigonometric Calculation have ads?
Trigonometric Calculation shows ads; Right Angle does not.
Which is updated more often, Right Angle or Trigonometric Calculation?
Right Angle ships an update every 5 days, and Trigonometric Calculation every 6 weeks. Most recently, Right Angle was updated on July 17, 2026 and Trigonometric Calculation on September 27, 2026.

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