# MillerTech vs RoyPow Fish.

The clearest difference is review sentiment: MillerTech at 100% against RoyPow Fish.'s 0%. MillerTech also leads on rating (4.3 vs 1.5). 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.

MillerTech holds the better App Store score, 4.3 against 1.5. Both are backed by a comparable volume of ratings — 6 and 4 respectively. Written reviews point the same way: 100% of MillerTech's written reviews are positive against 0% of RoyPow Fish.'s.

MillerTech ships an update every 2 months, RoyPow Fish. every 5 weeks. The most recent releases landed on June 10, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | MillerTech | RoyPow Fish. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/millertech/id1628834753/reviews)** | [1.5 (4 ratings)](https://appshunter.io/ios/app/roypow-fish/id6446618041/reviews) |
| Number of ratings | **6** | 4 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 42 MB | 27 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lester Miller](https://appshunter.io/developer/1646174937) | [深圳市环宇鼎鑫科技有限公司](https://appshunter.io/developer/1639662642) |

## What reviewers say

### MillerTech

[App page](https://appshunter.io/ios/app/millertech/id1628834753)

Monitor your lithium batteries with Bluetooth technology. Get instant access to key battery stats like voltage, state-of-charge, and real-time power usage. Enhance your experience and gain peace of mind with at-a-glance data.

**Highlights:** Bluetooth battery monitoring, Real-time power usage, Battery voltage display, State-of-Charge tracking, Design and remaining capacity

**Features:** macOS Compatibility

**In-app purchases:** none


### RoyPow Fish.

[App page](https://appshunter.io/ios/app/roypow-fish/id6446618041)

Monitor your battery management system (BMS) directly from your mobile device. Connect via Bluetooth to view battery status and parameters in real-time.

**Highlights:** Bluetooth connection, Battery BMS monitoring, Real-time parameter viewing, Mobile phone compatibility

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is MillerTech free?

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

### Is RoyPow Fish. free?

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

### Which has better reviews, MillerTech or RoyPow Fish.?

MillerTech is rated higher. MillerTech averages 4.3 out of 5 from 6 ratings, while RoyPow Fish. averages 1.5 from 4 ratings.

### Do MillerTech or RoyPow Fish. have ads?

Neither MillerTech nor RoyPow Fish. shows ads.

### Which is updated more often, MillerTech or RoyPow Fish.?

MillerTech ships an update every 2 months, and RoyPow Fish. every 5 weeks. Most recently, MillerTech was updated on June 10, 2026 and RoyPow Fish. on September 10, 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.*