# Echoes vs Sylvi

The clearest difference is review sentiment: Sylvi at 83% against Echoes's 38%. Sylvi also leads on rating (4.7 vs 3.3) and ratings volume (338 vs 24). Echoes's advantage is in-app purchases (none vs 10) and iOS requirement (10.0 vs 16.4). On price, ads and device support there is nothing between them.

Both are free to download. Sylvi sells 10 in-app purchases, starting at $2.99 per month. Echoes asks for nothing beyond the download.

Sylvi holds the better App Store score, 4.7 against 3.3. That said, the two scores are not equally well evidenced: Sylvi has 338 ratings behind it against 24, so its average is the more settled of the two. Written reviews point the same way: 38% of Echoes's written reviews are positive against 83% of Sylvi's.

## The numbers

| Metric | Echoes | Sylvi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (24 ratings)](https://appshunter.io/ios/app/echoes/id1529300249/reviews) | **[4.7 (338 ratings)](https://appshunter.io/ios/app/sylvi-language-penpals/id6478706305/reviews)** |
| Number of ratings | 24 | **338** |
| Positive reviews | 37.5% of reviews | **83.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 days |
| Monetization | **Free** | Free with in-app purchases |
| Size | 79 MB | 143 MB |
| Requires iOS | **10.0** | 16.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [King's Mobile](https://appshunter.io/developer/547238250) | [Sylvi Ltd](https://appshunter.io/developer/1733715535) |

## What reviewers say

### Echoes

[App page](https://appshunter.io/ios/app/echoes/id1529300249)

Visualize and record your heartbeat using your smartphone. Contribute to anonymized research at King's College London and Maastricht University to advance heart diagnosis technologies.

**Highlights:** Hear and visualize heartbeat, Save heart sound recordings, Observe heart sound evolution, Contribute to anonymized research, Understand heart diagnosis limits

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

**In-app purchases:** none


### Sylvi

[App page](https://appshunter.io/ios/app/sylvi-language-penpals/id6478706305)

Practice foreign languages with AI penpals who provide tutor-level feedback on every message. Learn essential phrases, build vocabulary, and stay motivated with friends. Offers a free trial before subscription.

**Highlights:** AI penpals for language practice, Real-time message correction and explanation, Vocabulary building and memorization tools, Practice with friends, Streak preservation, Flashcards and leaderboard

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sylvi Lite (Monthly) | $2.99 | per month |
| Monthly | $13.99 | per month |
| Monthly | $19.99 | per month |
| Monthly | $24.99 | per month |
| 3 months | $39.99 | per 3 months |
| 3 months | $39.99 | per 3 months |
| Annual | $59.99 | per year |
| Annual | $83.90 | per year |
| Annual | $89.99 | per year |
| Annual | $129.99 | per year |

**What reviewers like**

- 🚀 Excellent language learning tool
- 👍 Engaging and interactive
- 🤖 Helpful AI assistant
- 💬 Great for practicing conversations
- 📈 Noticeable improvement in language skills

**What reviewers complain about**

- 💰 Subscription required for full access
- 🔒 Limited free features
- 🌐 Lack of language options
- 🐛 Technical issues with speech recognition
- 🕰️ Repetitive lessons

**Reported bugs**

- Frequent app crashes
- Subscription issues
- Inconsistent user experience

**Requested features**

- Expand language options
- Improve free version features
- Implement more personalized learning
- Add more advanced conversation scenarios
- Improve speech recognition accuracy


## Frequently asked questions

### Is Echoes free?

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

### Is Sylvi free?

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

### Which has better reviews, Echoes or Sylvi?

Sylvi is rated higher. Echoes averages 3.3 out of 5 from 24 ratings, while Sylvi averages 4.7 from 338 ratings.

### Do Echoes or Sylvi have ads?

Neither Echoes nor Sylvi shows ads.

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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.*