# Instrument Test Prep vs knotecards

The clearest difference is price: Instrument Test Prep at Free against knotecards's $3.99. Instrument Test Prep also leads on rating (4.9 vs 4.5) and ratings volume (155 vs 2). knotecards's advantage is in-app purchases (none vs 4) and review sentiment (100% vs 88%). On ads, device support and iOS requirement there is nothing between them.

Instrument Test Prep is free to download; knotecards costs $3.99 up front. Instrument Test Prep sells 4 one-off in-app purchases. knotecards asks for nothing beyond the download.

Instrument Test Prep holds the better App Store score, 4.9 against 4.5. That said, the two scores are not equally well evidenced: Instrument Test Prep has 155 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 88% of Instrument Test Prep's written reviews are positive against 100% of knotecards's, so the app with the better star average is not the one people write more warmly about.

Instrument Test Prep ships an update fortnightly, knotecards every 6 weeks. The most recent releases landed on October 13, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Instrument Test Prep | knotecards |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[4.9 (155 ratings)](https://appshunter.io/ios/app/instrument-test-prep/id1456043080/reviews)** | [4.5 (2 ratings)](https://appshunter.io/ios/app/knotecards/id6748163448/reviews) |
| Number of ratings | **155** | 2 |
| Positive reviews | 87.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 122 MB | 1 MB |
| Requires iOS | **17.1** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 12+ |
| Developer | [Aeroapps Technology](https://appshunter.io/developer/923860276) | [altymytry](https://appshunter.io/developer/1824557021) |

## What reviewers say

### Instrument Test Prep

[App page](https://appshunter.io/ios/app/instrument-test-prep/id1456043080)

Prepare for your FAA Instrument Rating Knowledge Test with a comprehensive question bank and detailed explanations. Customize study sessions, take simulated exams, and track your progress. An optional upgrade unlocks full ground school lessons and advanced features.

**Highlights:** Over 900 FAA questions with explanations, Customizable study sessions, Simulated FAA exams, Review missed questions, Track progress across devices, Study resources library

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Instrument Ground School Trial | Free | one-time |
| Instrument Rating Test Prep | $49.99 | one-time |
| Upgrade to Ground School | $129.99 | one-time |
| Instrument Ground School | $179.99 | one-time |


### knotecards

[App page](https://appshunter.io/ios/app/knotecards/id6748163448)

Prepare for your Private Pilot Checkride with flashcards created by Certified Flight Instructors. This study tool covers ACS standards and includes sources for accurate information. Organize cards by knowledge level for efficient learning.

**Highlights:** Flashcards designed by CFIs, Covers ACS Standards, Includes sources for accuracy, Systematic and weighted card viewing, Covers 141 curriculum areas

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Instrument Test Prep free?

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

### Is knotecards free?

knotecards costs $3.99, with no in-app purchases.

### Which has better reviews, Instrument Test Prep or knotecards?

Instrument Test Prep is rated higher. Instrument Test Prep averages 4.9 out of 5 from 155 ratings, while knotecards averages 4.5 from 2 ratings.

### Do Instrument Test Prep or knotecards have ads?

Neither Instrument Test Prep nor knotecards shows ads.

### Which is updated more often, Instrument Test Prep or knotecards?

Instrument Test Prep ships an update fortnightly, and knotecards every 6 weeks. Most recently, Instrument Test Prep was updated on October 13, 2026 and knotecards on September 30, 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.*