# bloomWatch vs ZEFNET Charge

The clearest difference is rating: bloomWatch at 3.6 against ZEFNET Charge's 2.0. ZEFNET Charge's advantage is review sentiment (10% vs 0%) and iOS requirement (11.0 vs 13.0). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

bloomWatch holds the better App Store score, 3.6 against 2.0. Both are backed by a comparable volume of ratings — 12 and 6 respectively. Written reviews complicate that: 0% of bloomWatch's written reviews are positive against 10% of ZEFNET Charge's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 4 months. The most recent releases landed on September 10, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | bloomWatch | ZEFNET Charge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (12 ratings)](https://appshunter.io/ios/app/bloomwatch/id1107300124/reviews)** | [2.0 (6 ratings)](https://appshunter.io/ios/app/zefnet-charge/id1470100874/reviews) |
| Number of ratings | **12** | 6 |
| Positive reviews | 0.0% of reviews | **10.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | Every 4 months |
| Monetization | Free | Free |
| Size | 216 MB | 19 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [United States Environmental Protection Agency (USEPA)](https://appshunter.io/developer/466052690) | [ZEF Energy Inc.](https://appshunter.io/developer/1470100873) |

## What reviewers say

### bloomWatch

[App page](https://appshunter.io/ios/app/bloomwatch/id1107300124)

This app allows users to document and track the occurrence of freshwater algae blooms. Your submissions help scientists and public health officials monitor water quality and manage resources for recreation and potable water.

**Highlights:** Document algae bloom occurrences, Track bloom location and frequency, Contribute to water quality monitoring, Support scientific research, Report potentially harmful blooms

**Features:** macOS Compatibility

**In-app purchases:** none


### ZEFNET Charge

[App page](https://appshunter.io/ios/app/zefnet-charge/id1470100874)

Find and use public electric vehicle charging stations. Monitor and control your home charging unit, with options to override utility program restrictions for emergency charging.

**Highlights:** Find public chargers, Start/stop charging sessions, Secure in-app payments, Monitor home charger usage, Control home charger, Override charging restrictions

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is bloomWatch free?

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

### Is ZEFNET Charge free?

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

### Which has better reviews, bloomWatch or ZEFNET Charge?

bloomWatch is rated higher. bloomWatch averages 3.6 out of 5 from 12 ratings, while ZEFNET Charge averages 2.0 from 6 ratings.

### Do bloomWatch or ZEFNET Charge have ads?

Neither bloomWatch nor ZEFNET Charge shows ads.

### Which is updated more often, bloomWatch or ZEFNET Charge?

bloomWatch ships an update every 4 months, and ZEFNET Charge every 4 months. Most recently, bloomWatch was updated on September 10, 2026 and ZEFNET Charge on September 23, 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.*