Operational Amplifiers Guide vs Privela
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!
Privela
Securely store photos, videos, files, notes, and links in an encrypted vault on your iPhone. Organize content with albums and folders, and quickly find items with powerful search. Unlock with a PIN or Face ID for enhanced privacy.
- Encrypted vault for photos, videos, audio, files, notes, links
- PIN and Face ID unlock
- Searchable content within the vault
- Import via Share sheet
- Organize into albums and folders
- In-app browser for links
- Encrypted backup and migration (Pro)
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Keep photos, videos, audio, files, notes, and links organized in an encrypted vault on your iPhone. Unlock with a six-digit PIN or optional Face ID. Find content fast Search file names, note titles and content, and saved link URLs. Search is limited to the vault you’re currently using. Import and organize Bring in content from Files, your camera, or other apps through the Share sheet. Review incoming items in Inbox, organize content into albums and folders, preview supported PDFs and Office documents, edit notes, save links for in-app browsing, and recover items from Trash. Choose your start screen Standard is free. Privela Pro unlocks the Calculator and Minimal PIN start screens, 14 alternate app icons (Default is free), and a separate Secondary Vault with its own PIN. Pro also includes unlimited albums and Files folders, encrypted backup and device migration, and an ad-free experience. Your vault is stored on your iPhone, and no Privela account is required. Privela Pro is available as an annual auto-renewing subscription or a one-time lifetime purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Privela at fortnightly against Operational Amplifiers Guide's every 2 months. On price, ads, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Operational Amplifiers Guide ships an update every 2 months, Privela fortnightly. The most recent releases landed on October 1, 2026 and October 24, 2026 respectively.
| Parameter | Operational Amplifiers Guide | Privela |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 17 MB | 48 MB |
| Age rating | 4+ | 4+ |
| Developer | ALG Software Lab | 浩鑫 庄 |
In-app purchases
Operational Amplifiers Guide
No in-app purchases
Privela
No in-app purchases
Questions
Is Operational Amplifiers Guide free?
Is Privela free?
Do Operational Amplifiers Guide or Privela have ads?
Which is updated more often, Operational Amplifiers Guide or Privela?
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