Comparison

e vs Triangle3

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

Head to head
About

e

A powerful calculator app supporting scientific and engineering notation with a wide range of functions and constants. It offers features like calculation history, user-defined variables, and formula insertion for complex computations.

Highlights
  • Scientific and engineering notation
  • Calculation history
  • User-defined constants and variables
  • Advanced mathematical functions
  • Formula insertion
  • Autocomplete parentheses
Features
Read full description

This calculator can be used not only in scientific notation(e.g. 1E-6) but also using engineering multipliers(e.g. p,n,u,m,k,M). Features - Calculations History and reuse it - Calculation history is automatically saved when exit app,can also scroll. - Can use engineering multipliers,6 Special buttons - Four user-defined constant - Four interactive variable - Three buttons can be insert formula - interactive variable can have alias - Functions: √,log,ln,sin,cos,tan,sinh,cosh,tanh,asin,acos,atan,asinh,acosh,atanh,e^x - Built-in Constants:Ο€,bk,q,e0 and Operatorγ€€^ - Autocomplete parentheses - ON/OFF function key click sound - Mail transmission function of the calculation history - Built-in Online Help Viewer - Universal App There are also "e-calcFree" feature limited edition.

About

Triangle3

This app provides advanced calculation tools for field work, specializing in right and unequal triangles. It supports complex shapes like cones, pipes, and screw wings, with AR visualization for floor plans. It also includes standard calculator functions and memory features.

Highlights
  • Right and unequal triangle calculations
  • Complex shape development (cones, pipes, etc.)
  • Augmented Reality (AR) floor plan visualization
  • Standard calculator functions with memory
  • Trigonometric and cosine theorem calculations
  • PCD and screw wing calculations
Features
Read full description

This is a calculator application created by me, a canner, focusing on the functions of a calculator necessary for field work. Even if you don't understand trigonometric functions, you can easily calculate with this calculator. It can calculate right triangles and unequal triangles. It can calculate memory, answer memory, pi, repetition, parentheses, trigonometric functions, and cosine theorem. Develop cones (including misalignment), diagonal cuts, R-cuts, T-pipes, shrimp tubes, rounded corners, rounded corners (eccentricity), hopper eccentricity, pipes from mirror plates, connecting pipes to tapered pipes, screw wings, and calculate PCD. It is possible to display the development on the floor in full size with AR for a specific development. User's Manual ############################ Calculator section Press and hold the "ANS" button to display past calculation results. Tap the label of the calculation result (right after pressing =) to mark the value in the ANS list. Tap the white button to enter the value displayed on the label. Swipe the screen to the left or right to rotate the right triangle. Swipe the screen up and down to flip the right triangle. Enter two right triangles and three unequal triangles. Tap the "Cal" button to display the calculation result. Tap "Cl" button to clear the displayed value. You can also use the "0" label to erase only the specified locations. If you touch the button and slide it down, the numerical value of the calculation result will be displayed on the label, and can be used for the next calculation. Trigonometric calculations can be done with By sliding the [4] and [6] buttons, you can go back and forward. Pressing the CLR button once will erase the number. Press twice to reset the rotation. Press and hold to erase numbers, reset rotation, and erase memory. Press and hold to erase numbers, reset rotation, and clear memory. Automatic input of pipe outline Example 50A -> Input "5", "0", "1 slide". γ€€γ€€1ΒΌB -> Input "1", "4", "1" and "2 slides". Each slide twice in succession will reduce the value by half. Expansion section The input method is the same as in the calculator section. To expand a pipe, PCD, or mirror, slide the screen to the left or right to select the expansion diagram. Basically, all buttons need to be entered, but in some places "0" can be used. For round corners (eccentricity), double-tap the screen after entering the numerical value for round corners to switch to the input screen. Please enter the division of the circumference in multiples of 4. The calculation result is an image, so it may differ from the actual shape. Disclaimer Although every effort has been made to ensure the accuracy of the calculation results in this application, the accuracy is not guaranteed. Please note that we are not responsible for any damage, loss, or disadvantage caused by the use of this application.

Screenshots

e4 screens
Triangle34 screens

Verdict

The call

The clearest difference is review sentiment: Triangle3 at 40% against e's 0%. Triangle3 also leads on update cadence (every 5 weeks vs every 6 months). e's advantage is price ($0.99 vs $3.99) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases, monetization model and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

e costs $0.99 and Triangle3 $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

e ships an update every 6 months, Triangle3 every 5 weeks. The most recent releases landed on September 18, 2026 and September 13, 2026 respectively.

Scorecard4 real differences Β· 4 level
e versus Triangle3: the parameters behind the verdict, then further details
ParametereTriangle3
Price$0.99 β€” better$3.99
Positive reviews0.0% of reviews40.0% of reviews β€” better
Update frequencyEvery 6 monthsEvery 5 weeks β€” better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod β€” betteriPhone, iPod
Requires iOS12.0 β€” better15.0
Further details β€” not scored
Size10 MB7 MB
Age rating4+4+
Developere-skett Corp.ryo sasaki

Customer experience

e

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

Triangle3

Written reviews10 reviews
Positive40.0%
Neutral30.0%
Negative30.0%

In-app purchases

None

e

No in-app purchases

None

Triangle3

No in-app purchases

Questions

Is e free?
e costs $0.99, with no in-app purchases.
Is Triangle3 free?
Triangle3 costs $3.99, with no in-app purchases.
Do e or Triangle3 have ads?
Neither e nor Triangle3 shows ads.
Which is updated more often, e or Triangle3?
e ships an update every 6 months, and Triangle3 every 5 weeks. Most recently, e was updated on September 18, 2026 and Triangle3 on September 13, 2026.

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