Comparison

Protractor Edge vs Trig Instruments Toolbox

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

Head to head
About

Protractor Edge

Measure angles directly on your device without taking photos or placing the angle on screen. This app offers a unique and efficient way to determine degrees, saving you time with its handy assistant functionality.

Highlights
  • Direct angle measurement on device
  • Intuitive line dragging interface
  • Measures angles in photos (Premium)
  • Measures from camera view (Premium)
  • Ad-free experience (Premium)
Features
Read full description

A simple protractor. Just put your device on the angle you want to measure. Then drag the two lines to align the both sides of the angle. The degrees will be there. It is different from other protractor apps. This is a new way to measure angles. It requires neither taking photo nor putting the angle above the screen. Now start using this handy assistant to measure angles which will save you a lot of time. ------------------------------------- PREMIUM ACCESS SUBSCRIPTION - Measure the world from camera - Measure angles in photos - No Ads - The subscription is $0.99 yearly with trial - Payment will be charged to iTunes Account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that service, where applicable - Terms of use: https://service.notationpad.com/terms_service.html

About

Trig Instruments Toolbox

This utility app provides a collection of essential field tools, including a ratio to angle converter, inclinometer, tally counter, and protractor. It leverages your device's sensors for accurate estimations and calculations, reducing the need to carry multiple physical instruments.

Highlights
  • Ratio to Angle converter
  • Inclinometer
  • Tally counter
  • Protractor
  • Uses device sensors for accuracy
  • New free tools added regularly
Features
Read full description

Each tool is designed to be useful in the field, so you don't need to bring a pile of equipment and notes with you to do estimations and calculations. Taking advantage of your device's built in gyro, compass and camera, to give the most accurate results. The Trig Tool Box contains: • Ratio to Angle converter • Inclinometer • Tally counter • Protractor With more free tools being added all the time. Download now to keep this tool box in your back pocket - you never know when they will come in handy.

Screenshots

Protractor Edge2 screens
Trig Instruments Toolbox4 screens

Verdict

The call

The clearest difference is rating: Protractor Edge at 4.5 against Trig Instruments Toolbox's 2.6. Protractor Edge also leads on review sentiment (70% vs 50%) and ratings volume (55 vs 5). Trig Instruments Toolbox's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, update cadence 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. Protractor Edge sells 2 in-app purchases, starting at $1.99 per year. Trig Instruments Toolbox asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Protractor Edge holds the better App Store score, 4.5 against 2.6. That said, the two scores are not equally well evidenced: Protractor Edge has 55 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 70% of Protractor Edge's written reviews are positive against 50% of Trig Instruments Toolbox's.

UpkeepUpdate frequency

Protractor Edge ships an update every 43 months, Trig Instruments Toolbox every 27 months. The most recent releases landed on October 16, 2026 and October 7, 2026 respectively.

Scorecard7 real differences · 3 level
Protractor Edge versus Trig Instruments Toolbox: the parameters behind the verdict, then further details
ParameterProtractor EdgeTrig Instruments Toolbox
PriceFreeFree
Rating4.5 (55 ratings) — better2.6 (5 ratings)
Positive reviews69.6% of reviews — better50.0% of reviews
Number of ratings55 — better5
Update frequencyEvery 43 monthsEvery 27 months — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS9.0 — better15.0
Further details — not scored
Size21 MB54 MB
Age rating4+4+
Developer嵩 张Stevens Marketing Limited

Customer experience

Protractor Edge

All ratings55 ratings
Positive85.5%
Neutral5.5%
Negative9.1%
Written reviews46 reviews
Positive69.6%
Neutral8.7%
Negative21.7%

Trig Instruments Toolbox

All ratings5 ratings
Positive40.0%
Neutral0.0%
Negative60.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

2 purchases

Protractor Edge

Subscriptions1
  • Premium Access7 Days trial$1.991 Year
One-time1
  • Remove Ads$0.99
None

Trig Instruments Toolbox

No in-app purchases

Questions

Is Protractor Edge free?
Protractor Edge is free to download, with in-app purchases available.
Is Trig Instruments Toolbox free?
Trig Instruments Toolbox is free to download, with no in-app purchases.
Which has better reviews, Protractor Edge or Trig Instruments Toolbox?
Protractor Edge is rated higher. Protractor Edge averages 4.5 out of 5 from 55 ratings, while Trig Instruments Toolbox averages 2.6 from 5 ratings.
Do Protractor Edge or Trig Instruments Toolbox have ads?
Protractor Edge shows ads; Trig Instruments Toolbox does not.
Which is updated more often, Protractor Edge or Trig Instruments Toolbox?
Protractor Edge ships an update every 43 months, and Trig Instruments Toolbox every 27 months. Most recently, Protractor Edge was updated on October 16, 2026 and Trig Instruments Toolbox on October 7, 2026.

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