Comparison

Protractor Edge vs GhostLink

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

GhostLink

Features
Read full description

Share your location. Leave no trace GhostLink is a private location-sharing app that helps friends, family, and trusted connections find each other without requiring phone numbers, email accounts, social logins, or an unnecessarily detailed autobiography. Whether you’re meeting friends, checking that someone arrived safely, coordinating a trip, or locating the one person who said “I’m almost there” twenty minutes ago, GhostLink gives you a simple private map for sharing GPS location. WHY GHOSTLINK? • Private location sharing Send encrypted location updates only to people you choose. • Live GPS map View trusted connections and recent movement on a clean, easy-to-read map. • Location trails See where someone recently traveled, with adjustable trail durations. • Privacy radius Share an approximate location instead of your exact coordinates. Close enough to meet up, not close enough to identify your favorite couch cushion. • Expiring connections Location sharing can end automatically instead of becoming a permanent digital houseplant nobody remembers watering. • No phone number or email Your cryptographic identity is created on your device. A username helps friends find you without turning GhostLink into another social network. • Recovery phrase Restore your identity using a private recovery phrase—no “forgot password?” email required. GhostLink is useful as a friend tracker, family locator, travel companion, meetup map, safety check-in tool, private GPS tracker, and encrypted location-sharing app. Your location is personal. Share it deliberately, temporarily, and with fewer awkward group-chat directions.

Screenshots

Protractor Edge2 screens
GhostLink3 screens

Verdict

The call

The clearest difference is in-app purchases: GhostLink at none against Protractor Edge's 2. GhostLink also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 43 months). Protractor Edge's advantage is iOS requirement (9.0 vs 15.1). On price 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. GhostLink asks for nothing beyond the download.

UpkeepUpdate frequency

Protractor Edge ships an update every 43 months, GhostLink every 3 weeks. The most recent releases landed on October 11, 2026 and October 5, 2026 respectively.

Scorecard4 real differences · 6 level
Protractor Edge versus GhostLink: the parameters behind the verdict, then further details
ParameterProtractor EdgeGhostLink
PriceFreeFree
Rating4.5 (55 ratings) — better—
Positive reviews69.6% of reviews—
Number of ratings55 — better—
Update frequencyEvery 43 monthsEvery 3 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS9.0 — better15.1
Further details — not scored
Size21 MB136 MB
Age rating4+4+
Developer嵩 张Teo Udovcic

In-app purchases

2 purchases

Protractor Edge

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

GhostLink

No in-app purchases

Questions

Is Protractor Edge free?
Protractor Edge is free to download, with in-app purchases available.
Is GhostLink free?
GhostLink is free to download, with no in-app purchases.
Do Protractor Edge or GhostLink have ads?
Protractor Edge shows ads; GhostLink does not.
Which is updated more often, Protractor Edge or GhostLink?
Protractor Edge ships an update every 43 months, and GhostLink every 3 weeks. Most recently, Protractor Edge was updated on October 11, 2026 and GhostLink on October 5, 2026.

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