Comparison

Converter Plus [paid] vs Operational Amplifiers Pro

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

Head to head
About

Converter Plus [paid]

This app offers a comprehensive unit and currency converter with a vast array of categories and calculators for everyday financial and scientific needs. It allows users to customize templates, download shared ones, and automatically refreshes currency exchange rates.

Highlights
  • Extensive unit and currency conversion
  • Multiple calculators (mortgage, loan, tip)
  • Customizable and downloadable templates
  • Automatic currency exchange rate refresh
  • Support for compound units
  • Full text search for categories and units
Features
Read full description

Converter+ is a unit converter with the most extensive list of currencies and units in hundreds of categories. Converter Plus also comes with many calculators like mortgage, loan, tip, fuel consumption and many others for everyday problems. You can edit existing templates, add your own or download templates contributed by other users. Exchange rates for all 167 world's currencies is refreshed automatically every 6 hours or on request. FEATURES - Converting multiple units/currencies simultaneously - Support for compound units like Pounds + Ounces or Feet + Inches - Full text search to quickly locate categories and units - Built-in standard calculator - Favorite list - Automatic currency exchange rate refresh - Ability to edit units/templates and sharing the templates via email - Ability to download templates from the Converter Plus catalog on the internet CONVERSIONS/CALCULATIONS: Converter Plus ships with more than 100 categories, including: * Area, Cooking, Coordinates, Energy and Work, Frequency, Gas Mileage, Length - Distance, Power, Pressure, Temperature, Velocity, Speed, Volume - Capacity, Weight - Mass... * Currency (167 currencies), Inflation 1980-2010 (US), Savings. Loan, Mortgage, Energy Expense, Fuel Economy, Sales Tax, Tip Calculators… * Computer Data (Bytes, MB, KB, GB), Data Transfer, Radix (Hex, Oct, Bin)... * Many scientific unit categories Notes: To learn about designing templates in Converter Plus, please visit: http://www.trancreative.com/go/CPDocs

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!

Screenshots

Converter Plus [paid]4 screens
Operational Amplifiers Pro4 screens

Verdict

The call

The clearest difference is ratings volume: Converter Plus [paid] at 202 against Operational Amplifiers Pro's 1. Converter Plus [paid] also leads on price ($1.99 vs $4.99) and iOS requirement (8.0 vs 17.0). Operational Amplifiers Pro's advantage is rating (5.0 vs 4.7). On update cadence, ads, in-app purchases and monetization model 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

Converter Plus [paid] costs $1.99 and Operational Amplifiers Pro $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Operational Amplifiers Pro holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Converter Plus [paid] has 202 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Converter Plus [paid] ships an update every 3 months, Operational Amplifiers Pro every 2 months. The most recent releases landed on November 10, 2026 and November 3, 2026 respectively.

Scorecard4 real differences · 6 level
Converter Plus [paid] versus Operational Amplifiers Pro: the parameters behind the verdict, then further details
ParameterConverter Plus [paid]Operational Amplifiers Pro
Price$1.99 — better$4.99
Rating4.7 (202 ratings)5.0 (1 ratings) — better
Positive reviews90.2% of reviews—
Number of ratings202 — better1
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS8.0 — better17.0
Further details — not scored
Size7 MB14 MB
Age rating4+4+
DeveloperTranCreative SoftwareALG Software Lab

Customer experience

Converter Plus [paid]

All ratings202 ratings
Positive94.6%
Neutral1.0%
Negative4.5%
Written reviews286 reviews
Positive90.2%
Neutral3.8%
Negative5.9%

Operational Amplifiers Pro

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

Bugs and requests

Converter Plus [paid]

Reported bugs

3 issues
  • Currency rates not working
  • App crashes on launch
  • Unable to download templates

Requested features

4 requests
  • Improved currency rate updates
  • Ability to use Bluetooth keyboard
  • More conversion units and categories
  • iCloud sync for custom settings

Operational Amplifiers Pro

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Converter Plus [paid]

No in-app purchases

None

Operational Amplifiers Pro

No in-app purchases

Questions

Is Converter Plus [paid] free?
Converter Plus [paid] costs $1.99, with no in-app purchases.
Is Operational Amplifiers Pro free?
Operational Amplifiers Pro costs $4.99, with no in-app purchases.
Which has better reviews, Converter Plus [paid] or Operational Amplifiers Pro?
Operational Amplifiers Pro is rated higher. Converter Plus [paid] averages 4.7 out of 5 from 202 ratings, while Operational Amplifiers Pro averages 5.0 from 1 ratings.
Do Converter Plus [paid] or Operational Amplifiers Pro have ads?
Neither Converter Plus [paid] nor Operational Amplifiers Pro shows ads.
Which is updated more often, Converter Plus [paid] or Operational Amplifiers Pro?
Converter Plus [paid] ships an update every 3 months, and Operational Amplifiers Pro every 2 months. Most recently, Converter Plus [paid] was updated on November 10, 2026 and Operational Amplifiers Pro on November 3, 2026.

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