Operational Amplifiers Guide vs VoltSize
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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!
VoltSize
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VoltSize is a complete calculation and planning toolkit for anyone building a solar power system. CALCULATORS - Panel Sizing: how many watts of panels you need based on your daily consumption - Battery Capacity: compare LiFePO4, AGM, Gel and other battery types - Inverter Sizing: find the right inverter power with a safety margin - Cable Gauge: pick the right wire thickness based on voltage drop - Daily Consumption: pick from a ready device library to total your Wh/day WIZARDS Step-by-step guided wizards for Home, Caravan and Boat setups: pick your system voltage and battery type, add your devices, enter your sun hours, see results instantly. PANEL ANGLE & DIRECTION Pick your location on the map or use GPS; VoltSize suggests the optimal panel tilt angle and direction. Then use your phone's camera and compass to measure the panel's real angle and direction live. SHARE Export your wizard results or device list as a PDF and share it via WhatsApp, email, or any app you choose. All data stays on your device. Calculations in VoltSize are estimates; always consult a licensed electrician or solar installer before any real installation.
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Verdict
Operational Amplifiers Guide and VoltSize are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Operational Amplifiers Guide | VoltSize |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | — |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 17 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | ALG Software Lab | Emin Burak YILDIRIM |
In-app purchases
Operational Amplifiers Guide
No in-app purchases
VoltSize
No in-app purchases
Questions
Is Operational Amplifiers Guide free?
Is VoltSize free?
Do Operational Amplifiers Guide or VoltSize have ads?
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