# TrendLens vs Reef Guard

The clearest difference is in-app purchases: TrendLens at none against Reef Guard's 2. Reef Guard's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Reef Guard sells 2 in-app purchases, starting at $1.99 per month. TrendLens asks for nothing beyond the download.

TrendLens ships an update weekly, Reef Guard fortnightly. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | TrendLens | Reef Guard |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Size | 2 MB | 40 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ZHIYI LIN](https://appshunter.io/developer/1783163574) | [宇 郭](https://appshunter.io/developer/1851353253) |

## What reviewers say

### TrendLens

[App page](https://appshunter.io/ios/app/trendlens/id6738962925)

**Features:** macOS Compatibility

**In-app purchases:** none


### Reef Guard

[App page](https://appshunter.io/ios/app/reef-guard/id6755100588)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reef Guard Pro Monthly | $1.99 | per month |
| Reef Guard Pro Yearly | $19.99 | per year |


## Frequently asked questions

### Is TrendLens free?

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

### Is Reef Guard free?

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

### Do TrendLens or Reef Guard have ads?

Neither TrendLens nor Reef Guard shows ads.

### Which is updated more often, TrendLens or Reef Guard?

TrendLens ships an update weekly, and Reef Guard fortnightly. Most recently, TrendLens was updated on October 28, 2026 and Reef Guard on October 25, 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.*