# iKnow! vs Synth Brain

The clearest difference is price: iKnow! at Free against Synth Brain's $14.99. iKnow! also leads on device support (4 vs 2) and iOS requirement (14.0 vs 17.0). Synth Brain's advantage is in-app purchases (none vs 10). On ads there is nothing between them.

iKnow! is free to download; Synth Brain costs $14.99 up front. iKnow! sells 10 one-off in-app purchases. Synth Brain asks for nothing beyond the download.

## The numbers

| Metric | iKnow! | Synth Brain |
| --- | --- | --- |
| Price | **Free** | $14.99 |
| Rating | **[4.8 (490 ratings)](https://appshunter.io/ios/app/iknow/id417713473/reviews)** | — |
| Number of ratings | **490** | — |
| Positive reviews | 78.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 19 MB | 6 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DMM.com LLC](https://appshunter.io/developer/373765747) | [Code and DESIGN inc.](https://appshunter.io/developer/1172903960) |

## What reviewers say

### iKnow!

[App page](https://appshunter.io/ios/app/iknow/id417713473)

Master Japanese, Chinese, and English with this app's adaptive learning engine. It offers multiple study modes and synchronizes your progress across devices for flexible learning. Ideal for anyone looking to efficiently acquire new vocabulary and sentence structures.

**Highlights:** Adaptive learning engine, Spaced rehearsal pattern, Five study modes, Vocabulary and sentence mastery, Progress synchronization, Audio playback with speed control

**Features:** iMessage stickers, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 Month Plan | $23.99 | one-time |
| 12 Month Plan | $39.99 | one-time |
| 12+1 Month Plan | $39.99 | one-time |
| 6 Month Plan | $47.99 | one-time |
| 6+1 Month Plan | $47.99 | one-time |
| 12+3 Month Plan | $54.99 | one-time |
| 12 Month Plan | $59.99 | one-time |
| 12 Month Plan | $64.99 | one-time |
| 12+1 Month Plan | $64.99 | one-time |
| 12 Month Plan | $69.99 | one-time |

**What reviewers like**

- 🚀 Excellent for vocabulary learning
- 👍 Great for learning Japanese and Chinese
- 👍 Effective spaced repetition system
- 👍 Useful example sentences and audio
- 👍 Convenient for studying on the go

**What reviewers complain about**

- 🐛 Stability issues with recent updates
- 🐛 Crashes and freezes reported
- 🐛 Audio playback problems
- 🔒 Subscription-based model
- 👎 Limited customization options

**Reported bugs**

- Crashes on startup
- Blank screens during multiple-choice questions
- Issues with typing answers and registering input
- Audio not playing for some example sentences

**Requested features**

- Add more languages beyond Japanese and Chinese
- Improve community course integration
- Implement a dark mode
- Add more example sentences per word
- Provide an option to learn without kanji


### Synth Brain

[App page](https://appshunter.io/ios/app/synth-brain-learn-synthesis/id6799208817)

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

**In-app purchases:** none


## Frequently asked questions

### Is iKnow! free?

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

### Is Synth Brain free?

Synth Brain costs $14.99, with no in-app purchases.

### Do iKnow! or Synth Brain have ads?

Neither iKnow! nor Synth Brain shows ads.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*