# Inequality Calculator vs StudyDeck

The clearest difference is review sentiment: StudyDeck at 100% against Inequality Calculator's 0%. StudyDeck also leads on price (Free vs $5.99) and update cadence (every 2 weeks vs every 15 months). Inequality Calculator's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 26.0). On ads and device support there is nothing between them.

StudyDeck is free to download; Inequality Calculator costs $5.99 up front. StudyDeck sells 2 in-app purchases, starting at $12.99 per year. Inequality Calculator asks for nothing beyond the download.

Inequality Calculator ships an update every 15 months, StudyDeck every 2 weeks. The most recent releases landed on October 13, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Inequality Calculator | StudyDeck |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 weeks** |
| Monetization | Paid | **Freemium** |
| Size | 13 MB | 13 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Intemodino Group s.r.o.](https://appshunter.io/developer/557849644) | [Frederic Bacro](https://appshunter.io/developer/1482824795) |

## What reviewers say

### Inequality Calculator

[App page](https://appshunter.io/ios/app/inequality-calculator/id869888172)

This app solves linear and quadratic inequalities with detailed, step-by-step solutions. It supports fractions, parentheses, and presents answers in interval notation. Users can also access a history of up to 25 solved inequalities and email results.

**Highlights:** Solves linear and quadratic inequalities, Step-by-step solutions, Supports fractions and parentheses, Interval notation for solutions, Calculation history, Email results

**Features:** Vision Pro support

**In-app purchases:** none


### StudyDeck

[App page](https://appshunter.io/ios/app/studydeck-ai-flashcards/id6760428575)

Transform notes, PDFs, or photos into AI-powered flashcards instantly. Offers seven study modes, including spaced repetition and practice tests, to help you learn smarter and ace exams. On-device AI ensures your study materials remain private.

**Highlights:** AI-powered flashcard generation, Import notes, PDFs, and photos, Seven distinct study modes, Spaced repetition (FSRS algorithm), On-device AI for privacy, Progress tracking and analytics, Share decks with classmates

**Features:** Safari Extension, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StudyDeck Premium Annual | $12.99 | per year |
| Lifetime Pass | $39.99 | one-time |


## Frequently asked questions

### Is Inequality Calculator free?

Inequality Calculator costs $5.99, with no in-app purchases.

### Is StudyDeck free?

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

### Do Inequality Calculator or StudyDeck have ads?

Neither Inequality Calculator nor StudyDeck shows ads.

### Which is updated more often, Inequality Calculator or StudyDeck?

Inequality Calculator ships an update every 15 months, and StudyDeck every 2 weeks. Most recently, Inequality Calculator was updated on October 13, 2026 and StudyDeck on October 3, 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.*