Comparison

Protractor Smart vs Pipe Math Pro

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

Head to head
About

Protractor Smart

This app acts as a smart instrument for measuring angles using your device's camera. It offers two free modes for measuring angles on screen or using a plumb bob for slopes, with an additional premium mode for polygon measurements.

Highlights
  • Camera-based angle measurement
  • Touch measure mode
  • Plumb bob measure for slopes
  • Polygon measurement (premium)
  • Screenshot functionality
Features
Read full description

Protractor - smart instrument to measure angles. Turn on the camera mode and measure the angle of buildings, mountains, or any other object around you. This app includes two free measuring modes: - Touch measure - touch the screen to set the angle (use camera view!). - Plumb bob measure - pendulum - use to determine the slope (remember to calibrate the plumb). In each mode, you can switch to camera view and take measurements of all objects around you. Additional Premium mode: Polygon measurement lets you draw any shape on your screen to check all its angles. Turn on the camera to see the real object through your phone and copy its shape. You can also pick a photo from your gallery or take a new picture to draw a shape on the image. In Premium mode, you can change colors, add helper lines, and switch between different angle units. All modes allows you to make a screenshot of anything on the screen. Enjoy !!!

About

Pipe Math Pro

Features
Currently charting
Read full description

Know your travel. Know your cut. Get back to the job. Pipe Math Pro puts practical plumbing calculations and clear pipe diagrams in your pocket. Enter your measurements, see where they belong on the picture, and read the result in familiar tape-measure fractions. Designed by a plumber for plumbers, with the measurements you need close to the diagram and explanations available when you need them. ONE PURCHASE. ALL THE TOOLS. No ads. No subscriptions. No yearly fees. No in-app purchases. The calculations work offline, with no account required. OFFSETS: 22½°, 45° AND 60° • Calculate travel from spread. • Enter the fitting allowance and choose one or two deductions. • See spread, travel, fitting allowances and finished cut length on the pipe. • Read travel and cut pipe as separate results. ROLLING OFFSETS • Enter horizontal and vertical offsets. • Calculate true offset, travel and cut length. • Follow a 3-D pipe diagram showing each measurement. • Choose 22½°, 45° or 60° fittings. SPREAD ALLOWANCE • Keep parallel offset runs equally spaced. • Enter the first pipe cut, spacing and number of pipes. • Calculate the next pipe lengths with fitting allowances. • Work with 22½°, 45° and 60° offsets. PIPE SLOPE • Calculate rise over the pipe run. • Choose 1/16, 1/8, 1/4, 1/2 or 5/8 inch per foot, or use the percentage wheel. • See the high-end rise above level ground. PLUMBING QUICK MATH • Pipe volume per foot, total volume and water weight. • Tank capacity and partial fill for rectangular, vertical cylinder and horizontal cylinder tanks. • Water weight, including an empty pipe or tank's weight. • Water head and pressure: feet, PSI and kPa. • Pipe pressure loss with optional elevation and fittings inputs. • Flow and velocity, in either direction. • Fill or drain time, or the flow needed for a chosen time. • Measurement diagrams, input guidance and formulas. CONVERSIONS THAT FIT THE WAY YOU WORK • Feet and inches to metres, centimetres, or metres plus centimetres. • Reverse the direction in a tap. • Litres, Imperial gallons and US liquid gallons, clearly labelled. • Decimal inches to tape-measure fractions. • A basic calculator for everyday arithmetic. Enter decimal inches, fractions or mixed fractions in supported measurement fields. Displayed tape measurements round to the nearest 1/16 inch; calculations retain their underlying precision. Pipe Math Pro is the new version of Pipe Math. If you already own Pipe Math, this update is included with your existing App Store purchase. Use the actual inside dimensions and fitting allowances for your materials. Water pressure-loss results use the Hazen–Williams model and the selected pipe coefficient.

Screenshots

Protractor Smart4 screens
Pipe Math Pro4 screens

Verdict

The call

The clearest difference is price: Protractor Smart at Free against Pipe Math Pro's $9.99. Protractor Smart also leads on device support (3 vs 1) and iOS requirement (14.0 vs 17.6). Pipe Math Pro's advantage is in-app purchases (none vs 1) and chart position (#178 vs unranked). On ads 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

Protractor Smart is free to download; Pipe Math Pro costs $9.99 up front. Protractor Smart sells 1 one-off in-app purchase. Pipe Math Pro asks for nothing beyond the download.

UpkeepUpdate frequency

Protractor Smart ships an update every 21 months, Pipe Math Pro every 10 months. Both last shipped on October 5, 2026.

Scorecard6 real differences · 5 level
Protractor Smart versus Pipe Math Pro: the parameters behind the verdict, then further details
ParameterProtractor SmartPipe Math Pro
PriceFree — better$9.99
Rating4.6 (242 ratings) — better—
Positive reviews40.4% of reviews—
Number of ratings242 — better—
Update frequencyEvery 21 monthsEvery 10 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
Best chart rank—#178 — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS14.0 — better17.6
Further details — not scored
Size11 MB4 MB
Age rating4+4+
DeveloperExaMobile S.A.Antonio Vitella

Bugs and requests

Protractor Smart

Reported bugs

8 issues
  • App loads indefinitely
  • App does not launch after iOS updates
  • Stuck on loading screen
  • Photo upload not possible in premium version
  • Upside-down protractor on iOS
Show 3 more
  • Phone locks during use
  • Camera mode is terrible and inaccurate
  • Poor calibration

Requested features

6 requests
  • Improve camera function (light, zoom)
  • Add automatic hold function
  • Increase digital readout size
  • Add more skins/cosmetics
  • Option to remove ads
Show 1 more
  • Fix upside-down protractor on iOS

Pipe Math Pro

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Protractor Smart

One-time1
  • AdBlock - Remove ads$1.99
None

Pipe Math Pro

No in-app purchases

Questions

Is Protractor Smart free?
Protractor Smart is free to download, with in-app purchases available.
Is Pipe Math Pro free?
Pipe Math Pro costs $9.99, with no in-app purchases.
Do Protractor Smart or Pipe Math Pro have ads?
Neither Protractor Smart nor Pipe Math Pro shows ads.
Which is updated more often, Protractor Smart or Pipe Math Pro?
Protractor Smart ships an update every 21 months, and Pipe Math Pro every 10 months. Most recently, Protractor Smart was updated on October 5, 2026 and Pipe Math Pro on October 5, 2026.

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