# DuoCards vs Locked In

The clearest difference is ads: Locked In at none against DuoCards's shown. Locked In also leads on rating (5.0 vs 4.7) and update cadence (every 2 weeks vs monthly). DuoCards's advantage is ratings volume (1.4K vs 1) and iOS requirement (13.0 vs 17.0). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. DuoCards sells 10 in-app purchases, starting at $19.99 per month and Locked In sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Locked In holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: DuoCards has 1.4K ratings behind it against 1, so its average is the more settled of the two.

DuoCards ships an update monthly, Locked In every 2 weeks. The most recent releases landed on October 20, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | DuoCards | Locked In |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (1.4K ratings)](https://appshunter.io/ios/app/duocards-vocabulary-builder/id1508159917/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/locked-in-prep-for-data-plus/id6771492805/reviews)** |
| Number of ratings | **1.4K** | 1 |
| Positive reviews | 63.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 19 MB | 5 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DuoCards s.r.o](https://appshunter.io/developer/1508159916) | [OMAR DANIEL GRAZIANO](https://appshunter.io/developer/1896485759) |

## What reviewers say

### DuoCards

[App page](https://appshunter.io/ios/app/duocards-vocabulary-builder/id1508159917)

Master a new language with interactive flashcards and video courses. This app helps you build vocabulary, guess words, and track your progress across over 50 languages. Learn effectively through spaced repetition and integrated translation tools.

**Highlights:** Flashcard learning with spaced repetition, Video language courses with interactive subtitles, Integrated translator for over 50 languages, Vocabulary builder and progress tracker, Guess words and phrases to sharpen skills, Read foreign language articles

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DuoCards Premium | $19.99 | per month |
| DuoCards Plus | $33.00 | per 3 months |
| DuoCards Premium | $34.99 | per 3 months |
| DuoCards Premium | $49.99 | per year |
| DuoCards Premium | $64.90 | per year |
| DuoCards Premium | $67.99 | per year |
| DuoCards Premium | $107.99 | per year |
| DuoCards Premium | $109.00 | per year |
| DuoCards Premium | $113.99 | per year |
| DuoCards Premium | $162.99 | per year |

**What reviewers like**

- 👍 Easy to use
- 💡 Customizable flashcards
- 🚀 Efficient learning algorithm
- 🐘 Cute mascot (Memo the mammoth)

**What reviewers complain about**

- 🐛 Bugs and crashes
- ⚠️ Unreliable server connection
- 💰 Expensive subscription
- 🤔 Confusing interface

**Reported bugs**

- App freezes and crashes
- Issues with logging in and accessing content
- Inconsistent behavior when adding new words
- Problems with video playback and subtitles

**Requested features**

- Offline mode
- More customization options
- Improved spaced repetition system
- Better integration with other language learning tools


### Locked In

[App page](https://appshunter.io/ios/app/locked-in-prep-for-data-plus/id6771492805)

This app provides an offline historical study library for the retired CompTIA Data+ DA0-001 blueprint. It includes lessons, practice questions, interactive activities, flashcards, and progress tracking tools. A portion is free to explore, with a one-time purchase unlocking the full content.

**Highlights:** Historical coverage of Data+ domains, Short lessons with visual explanations, Hundreds of practice questions, Interactive PBQ-style activities, Flashcards with spaced repetition, Progress tracking and weak-spot review

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Data+ Full Unlock | $9.99 | one-time |


## Frequently asked questions

### Is DuoCards free?

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

### Is Locked In free?

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

### Which has better reviews, DuoCards or Locked In?

Locked In is rated higher. DuoCards averages 4.7 out of 5 from 1.4K ratings, while Locked In averages 5.0 from 1 ratings.

### Do DuoCards or Locked In have ads?

DuoCards shows ads; Locked In does not.

### Which is updated more often, DuoCards or Locked In?

DuoCards ships an update monthly, and Locked In every 2 weeks. Most recently, DuoCards was updated on October 20, 2026 and Locked In on October 2, 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.*