Appworthy

Right Angle

Triangles, trapezoids, circles

Jerry Mayers
Download on theApp Store
App Store rating3.9★30 ratings
PriceFreeIn-app $2.99–$29.99
Age4+Store age rating
Size3 MBiPhone download
CategoryProductivity
DeveloperJerry Mayers

What we found

Full report

Too little checked to say Store information only. We haven’t analysed this app or read its reviews yet.

Money

  • Free to download · in-app purchases $2.99–$29.99 (9 listed). Monthly plan $2.99 (about $36 a year); yearly plan $14.99. The other purchases’ names don’t say how often they bill.
  • If you subscribe through the store, cancel in iPhone Settings → your name → Subscriptions. Deleting the app doesn’t cancel a subscription.

Not yet tested.

The store currently lists version 6.2.0, updated 2026-10-15.

Preview

Screenshot 1Screenshot 2Screenshot 3Screenshot 4Screenshot 5Screenshot 6Screenshot 7Screenshot 8

Store screenshots supplied by the developer.

About this app

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.…

From the developer’s store description.

For developers and the curious

The full report

The evidence, sources, measurements and versions behind every label above.

Findings and evidence

Not yet tested
Not yet tested. No analysis has been published for this app. A missing label is not a clean bill of health.

What reviewers report

No review coverage

No review analysis published for this app.

Measurements

4 measured · 4 not assessed

“Not assessed” means we could not measure it. It is never a zero and never a pass.

From store data and reviews

Developer replies to reviews
Replies to fewer than 1 review in 20
Price in the store description
The store description doesn’t list prices (most don’t)
Cancelling, in the store description
The store description doesn’t say how to cancel (most don’t)
Themes reported by reviewers
Not assessed
This app's reviews have not been assessed yet
Five-star share of ratings
65–79% five-star
Arithmetic on the stores' own published rating counts. It says nothing about why the ratings fall where they do.

In the app package we scanned

No package has been scanned for this app, so nothing is published about what it ships. That is an absence of evidence, not a finding.

Sensitive permissions
Not assessed
No package has been scanned for this app
Analytics or tracking SDKs in the scanned package
Not assessed
No package has been scanned for this app
Advertising SDKs in the scanned package
Not assessed
No package has been scanned for this app
How we know

Supporting measurements: not a complete list of possible harms or positives. Measurement vocabulary 1.4 · how these are measured

Versions and dates analysed

Not yet tested

Not yet tested. No analysis has been run for this app, so there is no version or date to report.

Store update history

Each store’s release notes, as the developer wrote them. They are the developer’s words, not ours.

App Store

Version 6.2.0 · 2026-10-15
• See both answers: when your inputs fit two different triangles or segments, switch between them. • More ways to solve: a circle from its area, a segment from arc + chord or arc + height, a right triangle from angle C, and a trapezoid from both bases, one leg and the other leg's angle. • Clearer errors: the field that's off is outlined in red with the reason, and it's checked as you move between fields. • Values the app fills in are now labeled Calculated. • New Copy Results button. • Fixed rare crashes in the circle and trapezoid solvers.

Assessment record

Status
Not yet tested
App identifier
right-angle
Sources used
None recorded
Reviews read
None recorded
Package examined
No package scan
Human inspection
Not completed
How we know
Measurement vocabulary
1.4

Store facts

App Store

What the stores publish. Store ratings are the stores’ numbers, not Appworthy’s, and are never averaged across stores.

App Store

Store rating
3.93 ★ · 30 ratings
Version
6.2.0
Updated
15 Oct 2026
Price
Free · In-app purchases
Age rating
4+
Size
3 MB
Open in App Store
Developer
Jerry Mayers
Category
Productivity
Listing price
Free · In-app purchases

Purchases the store lists

 What this app sells

From the store listing. Billing terms are read from each purchase’s name — the stores don’t publish them — so treat them as a strong hint, not a disclosure.

Subscriptions2
Renews MonthlyMonthly$2.99
Renews YearlyYearly$14.99
Show 7 more purchases we couldn’t categorise

These are really on sale; we just can’t tell from the name whether they recur.

Oblique Triangle CalculatorTerm not stated$5.99
Segments CalculatorTerm not stated$5.99
Segment & Oblique TriangleTerm not stated$6.99
Small TipTerm not stated$2.99
Medium TipTerm not stated$4.99
Large TipTerm not stated$9.99
Huge TipTerm not stated$29.99

Method and limits

What this report can and cannot show

What a missing label means

Not yet tested. No analysis has been published for this app, so there is no method to describe for it yet. A missing label is not a clean bill of health: it means nothing has been read, not that nothing is wrong.

Limits of this report

  • A package scan is static. It identifies code and text in one Android build. It does not measure a live ad session, test a deletion request, or count the steps needed to cancel.
  • Reviews keep their sample. A review-only charge shows distinct reviewers, the share and the sample size, and is published only once it clears that label’s published threshold. Calibration labels are machine-drafted and not yet confirmed by a person.
  • Not assessed is a state. It is never a zero and never a pass.
  • A missing label is not a clean bill of health. It means the evidence did not support one, not that the app is problem-free.
Not yet human-reviewed. A human review gives an app hands-on, recorded measurements. None has been run for this app. Hands-on inspections are not yet open.
Review thresholds Read the methodology For developers

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