# Sunline Energy vs Keystone Connection

The clearest difference is rating: Sunline Energy at 3.1 against Keystone Connection's 1.4. Sunline Energy also leads on update cadence (every 6 days vs every 6 weeks) and iOS requirement (13.0 vs 16.0). Keystone Connection's advantage is ratings volume (59 vs 8). On price, review sentiment, ads and in-app purchases there is nothing between them.

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

Sunline Energy holds the better App Store score, 3.1 against 1.4. That said, the two scores are not equally well evidenced: Keystone Connection has 59 ratings behind it against 8, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.

Sunline Energy ships an update every 6 days, Keystone Connection every 6 weeks. The most recent releases landed on November 7, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Sunline Energy | Keystone Connection |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (8 ratings)](https://appshunter.io/ios/app/sunline-energy/id1613468189/reviews)** | [1.4 (59 ratings)](https://appshunter.io/ios/app/keystone-connection/id1643478570/reviews) |
| Number of ratings | 8 | **59** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 29 MB | 109 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SUNLINE ENERGY INC](https://appshunter.io/developer/1613468191) | [CINC Systems](https://appshunter.io/developer/673135886) |

## What reviewers say

### Sunline Energy

[App page](https://appshunter.io/ios/app/sunline-energy/id1613468189)

Connect directly with Sunline Energy for seamless communication and purchasing. Receive updates via push notifications and in-app messages to enhance your buying experience. Share your feedback through reviews after your purchase.

**Highlights:** Direct communication with Sunline Energy, User registration, Push notifications, In-app messaging, Product purchasing, Write reviews

**Features:** macOS Compatibility

**In-app purchases:** none


### Keystone Connection

[App page](https://appshunter.io/ios/app/keystone-connection/id1643478570)

This app facilitates community living for residents and board members of properties managed by Keystone. It allows users to pay balances, reserve amenities, access documents, and receive announcements, all from a single platform.

**Highlights:** Online balance payments, Amenity reservations, Access to important documents, Community announcements, Direct management team contact, Seamless living experience

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sunline Energy free?

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

### Is Keystone Connection free?

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

### Which has better reviews, Sunline Energy or Keystone Connection?

Sunline Energy is rated higher. Sunline Energy averages 3.1 out of 5 from 8 ratings, while Keystone Connection averages 1.4 from 59 ratings.

### Do Sunline Energy or Keystone Connection have ads?

Neither Sunline Energy nor Keystone Connection shows ads.

### Which is updated more often, Sunline Energy or Keystone Connection?

Sunline Energy ships an update every 6 days, and Keystone Connection every 6 weeks. Most recently, Sunline Energy was updated on November 7, 2026 and Keystone Connection on November 12, 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.*