Comparison

Operational Amplifiers Pro vs QR code

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

Head to head
About

Operational Amplifiers Pro

This app provides interactive calculators and reference information for designing and analyzing op-amp circuits. It offers step-by-step explanations and technical data on popular op-amp series, aiding students and engineers in circuit development and prototyping.

Highlights
  • Interactive op-amp circuit calculators
  • Step-by-step explanations and formulas
  • Reference data on op-amps and comparators
  • Support for 14 languages
  • Light and dark mode
  • Advanced calculators and circuit guides (Pro)
  • Full-text search (Pro)
Features
Read full description

Operational Amplifiers Pro is your essential tool for designing and analyzing circuits using op-amps. Whether you're a student, electronics enthusiast, or experienced engineer, this app helps you create, calculate, and understand a wide variety of op-amp–based circuits with ease. Use it as a practical reference when developing projects, building prototypes, or studying amplifier configurations. The app also includes technical data on popular operational amplifier and comparator series — making it a handy guide for both design and selection. Available in 14 Languages: • English, French, German, Indonesian, Italian, Japanese, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Turkish, Ukrainian, and Vietnamese — study in your native language! Key Features: • Interactive calculators for common op-amp circuits • Step-by-step explanations and formulas • Reference info on op-amps and comparators • Ideal for learning, prototyping, or quick checks • Light and dark mode support Pro Version Includes: • Advanced calculators and circuit guides • Full-text topic search • Save favorite circuits for quick access The application contains the following guides and calculators: Amplifiers • Non-inverting operational amplifier • Inverting operational amplifier • Inverting amplifier with T-bridge in OS • Differential amplifier • Differential amplifier with T-bridge in OS • Voltage repeater • Inverting voltage repeater • AC voltage amplifier • High Input Impedance AC Voltage Amplifier • AC voltage repeater ActiveFilters • Non-inverting low-pass filter • Inverting low-pass filter • Non-inverting high-pass filter • Inverting high pass filter • Bandpass filter • Gyrator Integrators and differentiators • Voltage integrator • Sum integrator • Integrator with signal amplification • Difference integrator • Double integrator • Voltage differentiator • Sum Differentiator • Differentiator with T-bridge • Differentiator with T-bridge made of capacitors • Difference differentiator Comparators • Comparator • Limiter • Limiter with zener diode at the input • RS trigger Attenuators • Non-inverting attenuator • Inverting attenuator Converters • Voltage-to-current converter with non-inverting input • Voltage to current converter with inverting input • Voltage to current converter with differential input Adders and substactors • Inverting adder • Addition-subtraction circuit • Non-inverting adder Logarithmic and exponential amplifiers • Diode-based logarithmic amplifier • Transistor-based logarithmic amplifier • Diode exponential amplifier • Exponential transistor amplifier • Popular operational amplifiers description and pinout Sine Wave generators • Op-Amp Oscillators • Oscillator with Diode in the Feedback Path • Twin-T Network Signal Generator Square-wave pulse generators • Op-Amp Square-Wave Generator • Adjustable Square-Wave Generator • Enhanced Square-Wave Generator • Duty-Cycle Adjustment • Triangle and Square-Wave Generator • Generator with Adjustable Slope and Duty Cycle Triangle-wave signal generators • Nonlinear Triangle-Wave Generator • Variable-Symmetry Sawtooth Generator • Linear Triangle-Wave Generator • Adjustable Linear Triangle-Wave Generator • Variable-Symmetry Ramp Generator Download now and power up your electronics work!

About

QR code

Easily scan, create, and manage QR codes and barcodes. Supports numerous formats and allows for effortless organization, export, and sharing of your codes.

Highlights
  • Effortless QR code and barcode scanning
  • Create various QR code types
  • Supports extensive format compatibility
  • Comprehensive code management
  • Export codes in TXT or CSV
  • Share codes easily
Features
Currently charting
Read full description

QR code - Scanner and Creator: Your All-in-One Solution. Discover the ultimate tool for scanning, creating, and managing QR codes and barcodes. FEATURES: Effortless Scanning: Scan QR codes and barcodes seamlessly using your device's camera or select from photos in the library Extensive Format Support: Read a variety of formats including Aztec, Code39, Code39Mod43, Code93, Code128, DataMatrix, QR, EAN-18, EAN-13, PDF17, Interleaved2of5, ITF14, UPC-E QR creator: Unleash your creativity with our QR code creator. Generate various types of QR codes, from simple text to links, contacts, and more Comprehensive Management: Organize and manage your QR codes and barcodes effortlessly. Store, search, view, delete, and share your codes with ease Export and Share: Export your list of QR codes and barcodes in TXT or CSV format, making it simple to share with others. Download now for a seamless and diverse app experience!

Screenshots

Operational Amplifiers Pro4 screens
QR code4 screens

Verdict

The call

The clearest difference is update cadence: QR code at every 6 days against Operational Amplifiers Pro's every 2 months. QR code also leads on price ($0.99 vs $4.99) and chart position (#190 vs unranked). On rating, ratings volume, ads and in-app purchases 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

Operational Amplifiers Pro costs $4.99 and QR code $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Operational Amplifiers Pro against 5.0 for QR code. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

Operational Amplifiers Pro ships an update every 2 months, QR code every 6 days. The most recent releases landed on October 1, 2026 and September 23, 2026 respectively.

Scorecard4 real differences · 6 level
Operational Amplifiers Pro versus QR code: the parameters behind the verdict, then further details
ParameterOperational Amplifiers ProQR code
Price$4.99$0.99 — better
Rating5.0 (1 ratings)5.0 (1 ratings)
Number of ratings11
Update frequencyEvery 2 monthsEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank—#190 — better
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS16.013.0 — better
Further details — not scored
Size14 MB1 MB
Age rating4+4+
DeveloperALG Software LabLe Vu

Customer experience

Operational Amplifiers Pro

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

QR code

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Operational Amplifiers Pro

No in-app purchases

None

QR code

No in-app purchases

Questions

Is Operational Amplifiers Pro free?
Operational Amplifiers Pro costs $4.99, with no in-app purchases.
Is QR code free?
QR code costs $0.99, with no in-app purchases.
Which has better reviews, Operational Amplifiers Pro or QR code?
Operational Amplifiers Pro and QR code are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Operational Amplifiers Pro or QR code have ads?
Neither Operational Amplifiers Pro nor QR code shows ads.
Which is updated more often, Operational Amplifiers Pro or QR code?
Operational Amplifiers Pro ships an update every 2 months, and QR code every 6 days. Most recently, Operational Amplifiers Pro was updated on October 1, 2026 and QR code on September 23, 2026.

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