# HappyKey vs FishLens AI

The clearest difference is rating: FishLens AI at 5.0 against HappyKey's 3.7. FishLens AI also leads on update cadence (every 10 days vs every 8 months). HappyKey's advantage is in-app purchases (none vs 9) and ratings volume (9 vs 1). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. FishLens AI sells 9 in-app purchases, starting at $7.99 per 7 days. HappyKey asks for nothing beyond the download.

FishLens AI holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: HappyKey has 9 ratings behind it against 1, so its average is the more settled of the two.

HappyKey ships an update every 8 months, FishLens AI every 10 days. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | HappyKey | FishLens AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (9 ratings)](https://appshunter.io/ios/app/happykey/id965705471/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fishlens-ai-fish-identifier/id6783878439/reviews)** |
| Number of ratings | **9** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 26 MB | 212 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Baratti](https://appshunter.io/developer/1264988386) | [懿峰 吕](https://appshunter.io/developer/1890054093) |

## What reviewers say

### HappyKey

[App page](https://appshunter.io/ios/app/happykey/id965705471)

This app offers a specialized keyboard for easily inputting a wide range of mathematical symbols. It includes numbers, operators, pi, infinity, and more, simplifying the process of writing math notation on your device.

**Highlights:** Specialized math symbol keyboard, Includes numbers and operators, Supports pi and infinity symbols, Simplifies math notation input, Customizable keyboard layout

**In-app purchases:** none


### FishLens AI

[App page](https://appshunter.io/ios/app/fishlens-ai-fish-identifier/id6783878439)

Instantly identify marine and freshwater fish species from photos. Get detailed profiles on habitat, edibility, and fishing tips. Log your catches and learn more about aquatic life.

**Highlights:** Instant fish identification, Detailed species profiles, Edibility and handling notes, Personal catch log, In-app educational guides, Offline identification support

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FishLens Pro Weekly | $7.99 | per 7 days |
| FishLens Pro Weekly | $7.99 | per 7 days |
| FishLens Pro Weekly | $9.99 | per 7 days |
| FishLens Pro Annual | $39.99 | per year |
| FishLens Pro Annual | $39.99 | per year |
| FishLens Pro Annual | $44.99 | per year |
| FishLens Pro Annual | $44.99 | per year |
| FishLens Pro Annual | $44.99 | per year |
| FishLens Pro Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is HappyKey free?

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

### Is FishLens AI free?

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

### Which has better reviews, HappyKey or FishLens AI?

FishLens AI is rated higher. HappyKey averages 3.7 out of 5 from 9 ratings, while FishLens AI averages 5.0 from 1 ratings.

### Do HappyKey or FishLens AI have ads?

Neither HappyKey nor FishLens AI shows ads.

### Which is updated more often, HappyKey or FishLens AI?

HappyKey ships an update every 8 months, and FishLens AI every 10 days. Most recently, HappyKey was updated on November 1, 2026 and FishLens AI on October 31, 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.*