# CISSP Practice Test Prep vs Stacker

The clearest difference is review sentiment: Stacker at 86% against CISSP Practice Test Prep's 0%. Stacker also leads on update cadence (every 2 weeks vs every 6 months). CISSP Practice Test Prep's advantage is ads (none vs shown) and device support (3 vs 1). On price, in-app purchases and monetization model there is nothing between them.

Both are free to download. CISSP Practice Test Prep sells 1 one-off in-app purchase and Stacker sells 1 in-app purchase, starting at $69.99 per year. Whichever you choose, the download price is not the number that matters.

CISSP Practice Test Prep ships an update every 6 months, Stacker every 2 weeks. The most recent releases landed on October 10, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | CISSP Practice Test Prep | Stacker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (25 ratings)](https://appshunter.io/ios/app/stacker-peptide-tracker/id6776001253/reviews)** |
| Number of ratings | — | **25** |
| Positive reviews | 0.0% of reviews | **85.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 7 MB | 51 MB |
| Requires iOS | **9.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [MOON MOUNTAIN INC](https://appshunter.io/developer/1555760990) | [Above Capital LLC](https://appshunter.io/developer/6776001255) |

## What reviewers say

### CISSP Practice Test Prep

[App page](https://appshunter.io/ios/app/cissp-practice-test-prep/id1439071492)

Prepare for your Certified Information Security Professional (CISSP) exam with over 1000 practice questions. This app utilizes a proprietary learning technique based on cognitive psychology to aid memorization and understanding. Try 10 free questions daily before upgrading to the full paid version.

**Highlights:** Over 1000 practice questions, Proprietary Effective Learning Strategy (ELS™), Daily free questions, Upgrade to paid version, Pass or its free guarantee

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CISSP Practice Test Premium | $9.99 | one-time |


### Stacker

[App page](https://appshunter.io/ios/app/stacker-peptide-tracker/id6776001253)

This app helps you discover, dose, and track peptide protocols for various health goals. It offers curated stacks, personalized schedules, and progress tracking with reminders. Features include a reconstitution calculator and an AI assistant for protocol summaries.

**Highlights:** Personalized stack building, Curated stacks with dosage guides, Dose and progress tracking, Smart dosing schedules and reminders, Reconstitution calculator, Expert-vetted peptide library, AI peptide assistant (Pro)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stacker Pro | $69.99 | per year |


## Frequently asked questions

### Is CISSP Practice Test Prep free?

CISSP Practice Test Prep is free to download, with in-app purchases available.

### Is Stacker free?

Stacker is free to download, with in-app purchases available.

### Do CISSP Practice Test Prep or Stacker have ads?

Stacker shows ads; CISSP Practice Test Prep does not.

### Which is updated more often, CISSP Practice Test Prep or Stacker?

CISSP Practice Test Prep ships an update every 6 months, and Stacker every 2 weeks. Most recently, CISSP Practice Test Prep was updated on October 10, 2026 and Stacker on October 17, 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.*