# Sinonimos ES vs Flashka

The clearest difference is in-app purchases: Sinonimos ES at none against Flashka's 4. Sinonimos ES also leads on ads (none vs shown) and iOS requirement (12.0 vs 16.4). Flashka's advantage is update cadence (fortnightly vs every 11 months). On price and device support there is nothing between them.

Both are free to download. Flashka sells 4 in-app purchases, starting at $3.99 per month. Sinonimos ES asks for nothing beyond the download.

Sinonimos ES ships an update every 11 months, Flashka fortnightly. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Sinonimos ES | Flashka |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (398 ratings)](https://appshunter.io/ios/app/flashka-ai-flashcards-maker/id6748599950/reviews)** |
| Number of ratings | — | **398** |
| Positive reviews | — | 79.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 11 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 65 MB | 173 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Ivo Fernandes](https://appshunter.io/developer/1251123569) | [Flashka OÜ](https://appshunter.io/developer/1826494341) |

## What reviewers say

### Sinonimos ES

[App page](https://appshunter.io/ios/app/sinonimos-es/id6471038342)

**Features:** macOS Compatibility

**In-app purchases:** none


### Flashka

[App page](https://appshunter.io/ios/app/flashka-ai-flashcards-maker/id6748599950)

Transform notes, PDFs, and lecture slides into interactive flashcards and AI-powered quizzes. Utilize spaced repetition and a personal AI tutor to master material and ace exams.

**Highlights:** AI-generated flashcards from notes/PDFs, Spaced-repetition study algorithms, AI-powered mock quizzes, Personal AI tutor for explanations, Import handwritten notes and photos, 24/7 study assistance

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Wizard Subscription | $3.99 | per month |
| Wizard Subscription | $9.99 | per month |
| Black Friday Discount | $29.99 | per year |
| Wizard Subscription | $59.99 | per year |


## Frequently asked questions

### Is Sinonimos ES free?

Sinonimos ES is free to download, with no in-app purchases.

### Is Flashka free?

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

### Do Sinonimos ES or Flashka have ads?

Flashka shows ads; Sinonimos ES does not.

### Which is updated more often, Sinonimos ES or Flashka?

Sinonimos ES ships an update every 11 months, and Flashka fortnightly. Most recently, Sinonimos ES was updated on November 3, 2026 and Flashka on November 5, 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.*