Comparison

Right Angle vs Angle Todo

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 provides precise calculations for geometric shapes like triangles, trapezoids, and circles. It offers multiple angle and length formats, a custom keyboard for job site use, and helpful error messages. Designed for professionals in construction, engineering, and trades.

Highlights
  • Calculates triangles, trapezoids, and circles
  • Supports decimal degrees, radians, DMS, percent grade, and pitch
  • Handles decimal, feet/inches/fractions length formats
  • Custom on-screen keyboard with job site symbols
  • VoiceOver support for accessibility
  • Available in English and Spanish
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

Angle Todo

Features
Read full description

Todo can have conditions: time, place, weather, personal status, who stay with you, custom conditions, etc. Clone existing Todos, conditions, valid time group, etc. === Statement === Subscription: https://bitbucket.org/anglenow/anglewiki/wiki/VIP Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://bitbucket.org/anglenow/anglewiki/wiki/Privacy_Policy

Screenshots

Right Angle4 screens
Angle Todo3 screens

Verdict

The call

The clearest difference is update cadence: Angle Todo at every 4 days against Right Angle's every 11 days. Angle Todo also leads on iOS requirement (15.0 vs 26.0). On price, ads, in-app purchases 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 and Angle Todo sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Right Angle ships an update every 11 days, Angle Todo every 4 days. The most recent releases landed on November 10, 2026 and November 7, 2026 respectively.

Scorecard2 real differences · 8 level
Right Angle versus Angle Todo: the parameters behind the verdict, then further details
ParameterRight AngleAngle Todo
PriceFreeFree
Rating4.0 (31 ratings) — better—
Positive reviews73.3% of reviews—
Number of ratings31 — better—
Update frequencyEvery 11 daysEvery 4 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.0 — better
Further details — not scored
Size8 MB29 MB
Age rating4+9+
DeveloperJerry Mayers国龙 赵

Bugs and requests

Right Angle

Reported bugs

5 issues
  • App crashes after startup
  • Update caused app to crash
  • Loss of previously purchased unlocked app
  • Keyboard covers input fields
  • App changes mm to unspecified units

Requested features

9 requests
  • Restore fraction support
  • Restore feet and inches support
  • Provide both angles of a right triangle
  • Allow scrolling or hiding the keyboard
  • Bundling with other tools
Show 4 more
  • Add metric units (millimeters)
  • Option to choose metric inputs
  • Dark mode option
  • Advanced analytics dashboard

Angle Todo

Not enough reviews yet to summarise bugs or requests.

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
4 purchases

Angle Todo

Subscriptions4
  • Monthly VIP$0.991 Month
  • Monthly VIP For Family$1.491 Month
  • Yearly VIP$10.991 Year
Show 1 more
  • Monthly VIP For Family$16.991 Year

Questions

Is Right Angle free?
Right Angle is free to download, with in-app purchases available.
Is Angle Todo free?
Angle Todo is free to download, with in-app purchases available.
Do Right Angle or Angle Todo have ads?
Neither Right Angle nor Angle Todo shows ads.
Which is updated more often, Right Angle or Angle Todo?
Right Angle ships an update every 11 days, and Angle Todo every 4 days. Most recently, Right Angle was updated on November 10, 2026 and Angle Todo on November 7, 2026.

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