# Test Prep 2020 vs Derivative

The clearest difference is price: Test Prep 2020 at Free against Derivative's $1.99. Test Prep 2020 also leads on iOS requirement (10.0 vs 15.1). Derivative's advantage is in-app purchases (none vs 10) and update cadence (monthly vs every 3 months). On ads and device support there is nothing between them.

Test Prep 2020 is free to download; Derivative costs $1.99 up front. Test Prep 2020 sells 10 one-off in-app purchases. Derivative asks for nothing beyond the download.

Test Prep 2020 ships an update every 3 months, Derivative monthly. The most recent releases landed on October 19, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Test Prep 2020 | Derivative |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/test-prep-2020/id1464950421/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free | — |
| Size | 89 MB | 32 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Feraco media Inc.](https://appshunter.io/developer/497957884) | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) |

## What reviewers say

### Test Prep 2020

[App page](https://appshunter.io/ios/app/test-prep-2020/id1464950421)

Prepare for major exams and tests with practice questions and vocabulary flashcards. Covers a wide range of subjects including DSST, CLEP, AP, Regents, and career-specific certifications.

**Highlights:** Practice exams with randomized questions, Vocabulary flashcards, Covers DSST exams, Covers CLEP exams, Covers AP exams, Covers Regents exams, Career test preparation

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DSST Human Resource Management | $0.99 | one-time |
| DSST  Organizational Behavior | $0.99 | one-time |
| CLEP  American Government | $0.99 | one-time |
| CLEP Principles of Management | $0.99 | one-time |
| Police Exam | $0.99 | one-time |
| Macroeconomics Flash Cards | $0.99 | one-time |
| Criminal Justice Flash Cards | $0.99 | one-time |
| Global History Regents FC | $0.99 | one-time |
| realestappr fc | $0.99 | one-time |
| police flashcards | $0.99 | one-time |


### Derivative

[App page](https://appshunter.io/ios/app/derivative-calculus-pro/id1618965619)

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

**In-app purchases:** none


## Frequently asked questions

### Is Test Prep 2020 free?

Test Prep 2020 is free to download, with in-app purchases available.

### Is Derivative free?

Derivative costs $1.99, with no in-app purchases.

### Do Test Prep 2020 or Derivative have ads?

Neither Test Prep 2020 nor Derivative shows ads.

### Which is updated more often, Test Prep 2020 or Derivative?

Test Prep 2020 ships an update every 3 months, and Derivative monthly. Most recently, Test Prep 2020 was updated on October 19, 2026 and Derivative on October 11, 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.*