# effectLang vs Underline

The clearest difference is in-app purchases: Underline at none against effectLang's 2. Underline also leads on ads (none vs shown) and iOS requirement (10.0 vs 16.0). effectLang's advantage is update cadence (every 3 weeks vs every 2 months). On price and device support there is nothing between them.

Both are free to download. effectLang sells 2 in-app purchases, starting at $3.49 per month. Underline asks for nothing beyond the download.

effectLang ships an update every 3 weeks, Underline every 2 months. The most recent releases landed on June 24, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | effectLang | Underline |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (7 ratings)](https://appshunter.io/ios/app/effectlang-spaced-repetition/id1567070251/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 93 MB | 40 MB |
| Requires iOS | 16.0 | **10.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Dawid Wnukowski](https://appshunter.io/developer/1444193124) | [Damian Skoneczny](https://appshunter.io/developer/1571773061) |

## What reviewers say

### effectLang

[App page](https://appshunter.io/ios/app/effectlang-spaced-repetition/id1567070251)

Master new languages with an effective, free system. Create custom flashcards with images and audio, and utilize spaced repetition for optimal memorization. Learn at your own pace, even offline, with a fun, game-like approach to vocabulary building.

**Highlights:** Custom flashcard creator, Spaced repetition algorithm, Image and audio integration, Offline learning capability, Excel import/export, Text-to-speech pronunciation

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $3.49 | per month |
| Premium | $21.49 | 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 effectLang free?

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

### Is Underline free?

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

### Do effectLang or Underline have ads?

effectLang shows ads; Underline does not.

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

effectLang ships an update every 3 weeks, and Underline every 2 months. Most recently, effectLang was updated on June 24, 2026 and Underline on September 9, 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.*