# Flashside vs Underline

The clearest difference is in-app purchases: Underline at none against Flashside's 2. Underline also leads on iOS requirement (10.0 vs 18.6). Flashside's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Flashside sells 2 in-app purchases, starting at $2.99 per month. Underline asks for nothing beyond the download.

Flashside ships an update every 3 weeks, Underline every 2 months. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Flashside | Underline |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/flashside-flashcards/id1518971790/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Freemium | — |
| Size | 65 MB | 40 MB |
| Requires iOS | 18.6 | **10.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CQUELLE GmbH](https://appshunter.io/developer/1457513606) | [Damian Skoneczny](https://appshunter.io/developer/1571773061) |

## What reviewers say

### Flashside

[App page](https://appshunter.io/ios/app/flashside-flashcards/id1518971790)

This app uses spaced repetition to help you learn anything, from vocabulary to exam questions. It creates a personalized study plan based on your available time and exam dates, adapting to your progress. Study offline with rich media support and track your learning visually.

**Highlights:** Spaced repetition learning, AI-powered study planning, Exam preparation mode, Customizable flashcards with rich media, Offline study capabilities, Progress tracking and memory charts, Import and share decks

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flashside Plus Monthly | $2.99 | per month |
| Flashside Plus Yearly | $17.99 | per year |


### Underline

[App page](https://appshunter.io/ios/app/underline-language-learning/id1571773059)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Flashside free?

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

### Is Underline free?

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

### Do Flashside or Underline have ads?

Neither Flashside nor Underline shows ads.

### Which is updated more often, Flashside or Underline?

Flashside ships an update every 3 weeks, and Underline every 2 months. Most recently, Flashside was updated on November 3, 2026 and Underline on October 27, 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.*