# Operational Amplifiers Guide vs Privela

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.

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.

## The numbers

| Metric | Operational Amplifiers Guide | Privela |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/privela-private-vault/id6773389987/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 17 MB | 48 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [浩鑫 庄](https://appshunter.io/developer/1602937604) |

## What reviewers say

### Operational Amplifiers Guide

[App page](https://appshunter.io/ios/app/operational-amplifiers-guide/id6467499897)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Privela

[App page](https://appshunter.io/ios/app/privela-private-vault/id6773389987)

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.

**Highlights:** 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)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Operational Amplifiers Guide free?

Operational Amplifiers Guide is free to download, with no in-app purchases.

### Is Privela free?

Privela is free to download, with no in-app purchases.

### Do Operational Amplifiers Guide or Privela have ads?

Both Operational Amplifiers Guide and Privela show ads.

### Which is updated more often, Operational Amplifiers Guide or Privela?

Operational Amplifiers Guide ships an update every 2 months, and Privela fortnightly. Most recently, Operational Amplifiers Guide was updated on October 1, 2026 and Privela on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*