Comparison

Protractor Edge vs Haldex.Flash

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

Haldex.Flash

Features
Read full description

Haldex.Flash turns your iPhone or iPad into a flashing, tuning and diagnostic tool for Haldex all-wheel-drive couplings and VAQ front differentials. No laptop, no cable, no trip to a workshop. Plug the Haldex.Flash adapter into your car's OBD port and pair it. The app reads your VIN, box code and controller software version automatically, then shows exactly what your licence allows. LIVE TUNING Change how the clutch engages without reflashing anything. The PWM duty map is laid out by road speed against throttle position - adjust any cell, apply it to the controller in seconds, and feel the difference on the next drive. Start from a preset and fine-tune from there: • OEM+ - a subtle gain over stock. Less understeer and more wet-weather confidence. A set-and-forget daily. • Street - noticeable all-wheel-drive feel, planted through corners. • Sport - aggressive corner-exit traction and strong mid-range. • Track - maximum safe engagement for consistent traction under power. • Drag -maximum coupling for straight-line launches. FLASHING Install a performance calibration, go back to the original factory calibration, or load a custom file. The whole procedure runs over Bluetooth with live progress on screen. Safety checks run before anything is written, you confirm with a deliberate press-and-hold, and an interrupted flash can be recovered. DIAGNOSTICS Read and clear fault codes from the Haldex or VAQ controller, with plain-English descriptions instead of raw hex. Stored and pending codes are shown separately. LOGGING Watch live data as you drive - pump duty, pump current, clutch and module temperature, wheel speeds, supply voltage and more. Export the whole run as a CSV file to analyse later or send to your tuner. SERVICE Run a clutch pump relearn and read back pump calibration values. BUILT FOR THE CAR PARK, NOT THE BENCH Everything happens over Bluetooth from the driver's seat. Progress is clear at every step, errors explain what to do next, and the app keeps working if you switch away mid-flash. WHAT YOU NEED • A Haldex.Flash Bluetooth adapter • A Haldex.Flash account • A licence for the vehicle you are working on A NOTE ON SAFETY Flashing modifies the control unit that manages your vehicle's drivetrain. Changes may affect how the car behaves, and may affect your warranty. Only use settings appropriate for the conditions you are driving in, and make sure modifications are permitted where you drive.

Screenshots

Protractor Edge2 screens
Haldex.Flash4 screens

Verdict

The call

The clearest difference is in-app purchases: Haldex.Flash at none against Protractor Edge's 2. Haldex.Flash also leads on ads (none vs shown) and update cadence (fortnightly vs every 43 months). Protractor Edge's advantage is iOS requirement (9.0 vs 16.4). 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. Haldex.Flash asks for nothing beyond the download.

UpkeepUpdate frequency

Protractor Edge ships an update every 43 months, Haldex.Flash fortnightly. Both last shipped on November 13, 2026.

Scorecard4 real differences · 6 level
Protractor Edge versus Haldex.Flash: the parameters behind the verdict, then further details
ParameterProtractor EdgeHaldex.Flash
PriceFreeFree
Rating4.2 (94 ratings) — better—
Positive reviews69.6% of reviews—
Number of ratings94 — better—
Update frequencyEvery 43 monthsFortnightly — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS9.0 — better16.4
Further details — not scored
Size21 MB33 MB
Age rating4+17+
Developer嵩 张Mobile Flash Solutions Ltd

In-app purchases

2 purchases

Protractor Edge

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

Haldex.Flash

No in-app purchases

Questions

Is Protractor Edge free?
Protractor Edge is free to download, with in-app purchases available.
Is Haldex.Flash free?
Haldex.Flash is free to download, with no in-app purchases.
Do Protractor Edge or Haldex.Flash have ads?
Protractor Edge shows ads; Haldex.Flash does not.
Which is updated more often, Protractor Edge or Haldex.Flash?
Protractor Edge ships an update every 43 months, and Haldex.Flash fortnightly. Most recently, Protractor Edge was updated on November 13, 2026 and Haldex.Flash on November 13, 2026.

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