Right Angle vs Angle Todo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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
Angle Todo
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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
Verdict
The clearest difference is iOS requirement: Angle Todo at 15.0 against Right Angle's 26.0. On price, update cadence, 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
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.
Right Angle ships an update every 5 days, Angle Todo every 4 days. The most recent releases landed on July 17, 2026 and September 11, 2026 respectively.
| Parameter | Right Angle | Angle Todo |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (30 ratings) — better | — |
| Positive reviews | 73.3% of reviews | — |
| Number of ratings | 30 — better | — |
| Update frequency | Every 5 days | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 29 MB |
| Age rating | 4+ | 9+ |
| Developer | Jerry Mayers | 国龙 赵 |
In-app purchases
Right Angle
- Renews Monthly14 Days trial$2.991 Month
- Renews Yearly1 Month trial$14.991 Year
- Small Tip$2.99
- Medium Tip$4.99
- Segments Calculator$5.99
Show 4 moreShow fewer
- Oblique Triangle Calculator$5.99
- Segment & Oblique Triangle$6.99
- Large Tip$9.99
- Huge Tip$29.99
Angle Todo
- Monthly VIP$0.991 Month
- Monthly VIP For Family$1.491 Month
- Yearly VIP$10.991 Year
Show 1 moreShow fewer
- Monthly VIP For Family$16.991 Year
Questions
Is Right Angle free?
Is Angle Todo free?
Do Right Angle or Angle Todo have ads?
Which is updated more often, Right Angle or Angle Todo?
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