# DSST Technical Writing Prep vs Asap Calculus

The clearest difference is price: Asap Calculus at Free against DSST Technical Writing Prep's $1.99. DSST Technical Writing Prep's advantage is in-app purchases (none vs 1) and iOS requirement (10.0 vs 15.6). On update cadence, ads and device support there is nothing between them.

Asap Calculus is free to download; DSST Technical Writing Prep costs $1.99 up front. Asap Calculus sells 1 one-off in-app purchase. DSST Technical Writing Prep asks for nothing beyond the download.

DSST Technical Writing Prep ships an update every 4 months, Asap Calculus every 3 months. The most recent releases landed on September 23, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | DSST Technical Writing Prep | Asap Calculus |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[4.2 (87 ratings)](https://appshunter.io/ios/app/asap-calculus/id1271201984/reviews)** |
| Number of ratings | — | **87** |
| Positive reviews | — | 60.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | — | Free with in-app purchases |
| Size | 50 MB | 18 MB |
| Requires iOS | **10.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Feraco media Inc.](https://appshunter.io/developer/497957884) | [Mohammed Hassan Aljanahi](https://appshunter.io/developer/1219637605) |

## What reviewers say

### DSST Technical Writing Prep

[App page](https://appshunter.io/ios/app/dsst-technical-writing-prep/id959410743)

**Features:** macOS Compatibility

**In-app purchases:** none


### Asap Calculus

[App page](https://appshunter.io/ios/app/asap-calculus/id1271201984)

Learn calculus concepts and problem-solving techniques rapidly. This app offers shortcuts to tackle difficult problems instantly, covering both college-level and AP Calculus curricula.

**Highlights:** Learn calculus quickly and efficiently, Discover problem-solving shortcuts, Solve hard problems instantly, Covers college and AP Calculus

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Access | $0.99 | one-time |


## Frequently asked questions

### Is DSST Technical Writing Prep free?

DSST Technical Writing Prep costs $1.99, with no in-app purchases.

### Is Asap Calculus free?

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

### Do DSST Technical Writing Prep or Asap Calculus have ads?

Neither DSST Technical Writing Prep nor Asap Calculus shows ads.

### Which is updated more often, DSST Technical Writing Prep or Asap Calculus?

DSST Technical Writing Prep ships an update every 4 months, and Asap Calculus every 3 months. Most recently, DSST Technical Writing Prep was updated on September 23, 2026 and Asap Calculus on September 13, 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.*