# CNCW vs GreyStone Power

The clearest difference is review sentiment: CNCW at 69% against GreyStone Power's 12%. CNCW also leads on rating (4.8 vs 2.4). GreyStone Power's advantage is iOS requirement (12.0 vs 15.0). 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.

CNCW holds the better App Store score, 4.8 against 2.4. Both are backed by a comparable volume of ratings — 160 and 59 respectively. Written reviews point the same way: 69% of CNCW's written reviews are positive against 12% of GreyStone Power's.

CNCW ships an update every 8 months, GreyStone Power every 6 months. The most recent releases landed on October 13, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CNCW | GreyStone Power |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (160 ratings)](https://appshunter.io/ios/app/cncw/id779712424/reviews)** | [2.4 (59 ratings)](https://appshunter.io/ios/app/greystone-power/id983961601/reviews) |
| Number of ratings | **160** | 59 |
| Positive reviews | **68.8% of reviews** | 11.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 6 months** |
| Monetization | Free | Free |
| Size | 25 MB | 174 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Paymentus Corporation](https://appshunter.io/developer/779712427) | [GreyStone Power Corporation,an electric membership corporation](https://appshunter.io/developer/983961600) |

## What reviewers say

### CNCW

[App page](https://appshunter.io/ios/app/cncw/id779712424)

This application allows Contra Costa Water District customers to conveniently manage and pay their water bills directly from their iOS devices. It provides a secure platform for enrollment and payment processing.

**Highlights:** Bill payment, Account enrollment, Secure transactions, Mobile access

**Features:** macOS Compatibility

**In-app purchases:** none


### GreyStone Power

[App page](https://appshunter.io/ios/app/greystone-power/id983961601)

Manage your electricity account with ease. View bills, make payments, and track usage. Report outages and find office locations on the go.

**Highlights:** Account management, Bill viewing, Payment processing, Electricity usage tracking, Outage reporting, Office location finder, Alerts and reminders

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CNCW free?

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

### Is GreyStone Power free?

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

### Which has better reviews, CNCW or GreyStone Power?

CNCW is rated higher. CNCW averages 4.8 out of 5 from 160 ratings, while GreyStone Power averages 2.4 from 59 ratings.

### Do CNCW or GreyStone Power have ads?

Neither CNCW nor GreyStone Power shows ads.

### Which is updated more often, CNCW or GreyStone Power?

CNCW ships an update every 8 months, and GreyStone Power every 6 months. Most recently, CNCW was updated on October 13, 2026 and GreyStone Power on October 7, 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.*