Comparison

P&ID vs Voltius

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

Head to head
About

P&ID

Master the art of reading and interpreting Piping and Instrumentation Diagrams (P&IDs) with this engaging trivia quiz. Test your knowledge of P&ID symbols and their applications through interactive quizzes with detailed explanations and real-world examples. Learn at your own pace with multiple difficulty levels and offline mode.

Highlights
  • Interactive P&ID symbol quizzes
  • Symbol categorization
  • Detailed explanations and examples
  • Multiple difficulty levels
  • Offline learning mode
Features
Read full description

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Master the art of reading and interpreting Piping and Instrumentation Diagrams (P&IDs) with P&ID Trivia! This engaging trivia quiz app is designed for engineers, students, and industry professionals looking to enhance their knowledge of P&ID symbols and their applications. Key Features: Interactive Quizzes: Test your skills with hundreds of questions on P&ID symbols, including valves, instruments, pumps, and more. Symbol Categories: Learn and identify symbols from various categories such as piping, process equipment, instrumentation, and control systems. Learn as You Play: Get detailed explanations and real-world examples after each question to deepen your understanding Multiple Difficulty Levels: Start as a beginner and advance to expert-level challenges. Offline Mode: Learn anytime, anywhere, without the need for an internet connection. Perfect for students, professionals, and anyone working in engineering, manufacturing, or process industries. With P&ID Trivia, you'll gain confidence in reading diagrams and understanding process flows like a pro. Download now and become a P&ID expert! Download Piping and Instrumentation Diagrams (P&IDs) today and see how many like you can identify like: Hand-Operated Gate Valve, Gate Valve, Closed Gate Valve, Hand-Operated Globe Valve, Globe Valve, Rotary Valve, Needel Valve, Control Valve, Piston-Operated Valve, Back Pressure Regulator, Plug or C**k Valve, Check Valve, Butterfly Valve, Flanged Valve, Angle Valve Hand-Operated, Angle Globe Valve, Relief Valve, Angle Valve, Angle Blowdown Valve, Ball, Normally Closed Ball, Diaghragm, Plug Valve, Check Valve, Solenoid Valve, Hydraulic Valve, Motor-Operated Valve, Pilot Gate Valve, Weight Gate Valve, Powered Valve, Float-Operated Valve, Needle Valve, 3-Way Valve, 3-Way Plug Valve, Diaphragm Valve, 4-way Plug Valve, 4-way Valve, Electro-Hydraulic Valve, Balanced Diaphragm Gate Valve, Spring Gate Valve, Ram Valve, Slide Valve, Metering Coke, Knife Valve, Excess Flow Valve, Post Indicator, Self Draining Valve, Pinch Valve, Minimum Flow Valve, Auto Recirculation, Gauge, Bleeder Valve, Integrated Block Valve, Maual Integrated Valve, Orifice, Rotameter, Quarter Turn Valve Double Acting, Quarter Turn Valve Spring Acting, Self-Operating Release Valve, Indicator, Behind Control, On Central Control, On Local Control Pane, Behind a Local Control, Odometer, Pressure Gauge, Flowmeter, Thermometer, Shared Indicator, Displayed Configurable, Computer Indicator, Programmable Indicator, Displayed Programmable Device, Computer, Unit Control Panel, Temp Indicator, Temp Transmitter, Temp Recorder, Temp Controller, Flow Indicator, Flow Transmitter, Flow Recorder, Flow Controller, Level Indicator, Pressure Indicator, Level Transmitter, Level Recorder, Level Controlle, Pressure Transmitter, Pressure Recorder, Pressure Controller, Pressure Indicator, Pressure Recording, Level Alarm, Flow Element, Temperature Element, Level Gauge, Analyzer Transmitter, Transducer, Specialty Item, Sampler, Straightening Vanes, Diaphragm Meter, Rotary Meter, Magnetic, Pitot Tube Type Flow, Pitot Tube, Wedge Meter, Target Meter, Weir Meter, Ultrasonic Meter, V-cone Meter, Venturi Meter, Quick Change, Turbine Meter, Rotometer, Double, Steam Traced, Venturi, Flowmeter, Vortex Sensor, And Gate, Or Gate, Not Gate, Correcting Element, Diamond, Pressure Gauges, Thermometers, Averaging Pitot Tube, Level Meter, Coriolis Flow Sensor, Flow Nozzle Meter, Flume Meter, Manhole, Socket Connection, Support Bracket, Support Leg, Support Ring, Support Skirt, Compressor, Reciprocating Compressor, Compressor silencers, Centrifugal, Rotary Compressor, Rotory Compressor and silencers, Liquid ring Compressor, Centrifugal Compressor, Centrifugal blower, Axial Compressor, Centrifugal pump, Gas blower, Vertical pump, Liquid ring vacuum pump

About

Voltius

Features
Read full description

Voltius supports electrical conductor sizing using selected tables and criteria from the Brazilian NBR 5410 standard. It is intended for engineers, electricians and technicians working with low-voltage electrical installations. FEATURES • Installation methods A1, A2, B1, B2, C, D, E, F and G, with simplified selection for A and B. • Copper and aluminum conductors; PVC 70°C and EPR/XLPE 90°C insulation. • Ampacity-based conductor size preview. • Voltage-drop calculation when voltage and length are provided, with an option to recalculate conductor size. • Temperature and grouping correction factors. • Layers and parallel conductors for supported combinations, with messages when a specific engineering assessment is required. • Neutral conductor cross-section display. • Light and dark themes. • Interface available in Portuguese, English and Spanish. REFERENCE AND SCOPE NBR 5410:2004, corrected version 2008 — Low-voltage electrical installations. This app does not replace consultation of the official standard or assessment of a complete installation. The current-only preview does not check voltage drop. Results must be validated by a qualified professional. CALCULATION REPORT Export a PDF with inputs, formulas, calculation steps and assumptions. Compare sizing by current-carrying capacity, resistance-only voltage-drop resizing and resizing with estimated reactance. Set power factor, inductive or capacitive load and 50 or 60 Hz frequency in advanced parameters. The model uses resistance corrected for the assumed conductor temperature and approximate reactance. It does not verify actual cable temperature or current balance between parallel conductors; cases requiring these checks remain identified as unvalidated previews.

Screenshots

P&ID4 screens
Voltius4 screens

Verdict

The call

The clearest difference is in-app purchases: Voltius at none against P&ID's 3. Voltius also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads 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. P&ID sells 3 in-app purchases, starting at $9.99 per month. Voltius asks for nothing beyond the download.

UpkeepUpdate frequency

P&ID ships an update every 2 weeks, Voltius every 3 weeks. The most recent releases landed on October 4, 2026 and October 14, 2026 respectively.

Scorecard2 real differences · 8 level
P&ID versus Voltius: the parameters behind the verdict, then further details
ParameterP&IDVoltius
PriceFreeFree
Rating4.3 (6 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings6 — better—
Update frequencyEvery 2 weeks — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPod — better
Requires iOS17.015.0 — better
Further details — not scored
Size6 MB20 MB
Age rating4+4+
DeveloperForwa Elade WundeCaio Pinheiro

In-app purchases

3 purchases

P&ID

Subscriptions3
  • Month$9.991 Month
  • 6 months$19.996 Months
  • Year$29.991 Year
None

Voltius

No in-app purchases

Questions

Is P&ID free?
P&ID is free to download, with in-app purchases available.
Is Voltius free?
Voltius is free to download, with no in-app purchases.
Do P&ID or Voltius have ads?
Neither P&ID nor Voltius shows ads.
Which is updated more often, P&ID or Voltius?
P&ID ships an update every 2 weeks, and Voltius every 3 weeks. Most recently, P&ID was updated on October 4, 2026 and Voltius on October 14, 2026.

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