CNCW vs GreyStone Power
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CNCW
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.
- Bill payment
- Account enrollment
- Secure transactions
- Mobile access
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This is for Contra Costa Water District's customers to make payments. This application is created by Paymentus Corporation for customers to enroll and pay bills from an iOS device.
GreyStone Power
Manage your electricity account with ease. View bills, make payments, and track usage. Report outages and find office locations on the go.
- Account management
- Bill viewing
- Payment processing
- Electricity usage tracking
- Outage reporting
- Office location finder
- Alerts and reminders
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GreyStone’s mobile app gives you fast, secure account access so you can easily manage your account details, view your bill and account balance, make payments, and view your electricity use. You can also report outages, view our office and payment locations, schedule alerts and reminders, and connect to our social media pages. Nearly everything you can do from our web portal can now be handled instantly whether you’re at home, at work, or on the go.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | CNCW | GreyStone Power |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (160 ratings) — better | 2.4 (59 ratings) |
| Positive reviews | 68.8% of reviews — better | 11.8% of reviews |
| Number of ratings | 160 — better | 59 |
| Update frequency | Every 8 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 25 MB | 174 MB |
| Age rating | 4+ | 4+ |
| Developer | Paymentus Corporation | GreyStone Power Corporation,an electric membership corporation |
Customer experience
CNCW
GreyStone Power
In-app purchases
CNCW
No in-app purchases
GreyStone Power
No in-app purchases
