Pedal Builder vs Operational Amplifiers Guide
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pedal Builder
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This app is built to help you track your pedal builds and the inventory of parts. As you build pedals manually cross referencing your inventory is slow and tedious. With this app you can simply populate your inventory. Then add a pedal build and from the bill of materials add parts and you will be alerted if they are already in your inventory or not. Additionally, you can create a list of parts needed for that next order!
Operational Amplifiers Guide
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Operational Amplifiers Guide is your essential tool for designing and analyzing circuits using op-amps and comparators. 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 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 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-wave signal generators • Nonlinear Triangle-Wave Generator • Variable-Symmetry Sawtooth Generator • Linear Triangle-Wave Generator • Adjustable Linear Triangle-Wave Generator • Variable-Symmetry Ramp Generator Popular operational amplifiers: description and pinout Popular comparators: description and pinout Download now and power up your electronics work!
Screenshots
Verdict
The clearest difference is price: Operational Amplifiers Guide at Free against Pedal Builder's $1.99. Operational Amplifiers Guide also leads on update cadence (every 2 months vs every 19 months). Pedal Builder's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement 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
Operational Amplifiers Guide is free to download; Pedal Builder costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Pedal Builder ships an update every 19 months, Operational Amplifiers Guide every 2 months. The most recent releases landed on October 7, 2026 and October 1, 2026 respectively.
| Parameter | Pedal Builder | Operational Amplifiers Guide |
|---|---|---|
| Price | $1.99 | Free — better |
| Update frequency | Every 19 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 27 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | John Toms | ALG Software Lab |
In-app purchases
Pedal Builder
No in-app purchases
Operational Amplifiers Guide
No in-app purchases
Questions
Is Pedal Builder free?
Is Operational Amplifiers Guide free?
Do Pedal Builder or Operational Amplifiers Guide have ads?
Which is updated more often, Pedal Builder or Operational Amplifiers Guide?
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