NHD vs Keystone Connection
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NHD
This app helps participants navigate and stay updated on the National History Day - California State Contest. Create a personalized schedule for student projects like exhibits, documentaries, and websites, and use built-in maps and agendas to explore the competition.
- Create custom event schedules
- View student project details
- Access contest maps
- Check event agendas
- Stay updated on contest news
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The official National History Day - California (NHD-CA) app gives you the tools to navigate and stay up-to-date on the NHD-CA State Contest. The NHD-CA app allows you to create your own schedule of student-produced exhibits, documentaries, historical papers, performances, posters, and websites. The app also helps navigate the competition with maps, agendas, and much more!
Keystone Connection
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.
- Online balance payments
- Amenity reservations
- Access to important documents
- Community announcements
- Direct management team contact
- Seamless living experience
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Welcome to the Keystone Connect app, your all-in-one digital companion for effortless community living. Designed for homeowners, residents, and board members of properties managed by Keystone this app keeps you connected, informed, and in control, anytime, anywhere. With Keystone you can pay your balance online, reserve amenities, access important documents, stay updated with community announcements, and connect easily with your management team, and much more, all in one convenient place. Whether you’re at home or on the go, the Keystone app brings your community to your fingertips, making it easier than ever to manage your home, stay engaged, and enjoy a seamless living experience. Download now and experience a new way to live connected app, your all-in-one digital companion for effortless community living.
Screenshots
Verdict
The clearest difference is rating: NHD at 4.7 against Keystone Connection's 1.4. NHD also leads on iOS requirement (14.0 vs 16.0). Keystone Connection's advantage is ads (none vs shown) and update cadence (every 6 weeks vs every 11 months). On price, in-app purchases and device support 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.
NHD holds the better App Store score, 4.7 against 1.4. That said, the two scores are not equally well evidenced: Keystone Connection has 59 ratings behind it against 6, so its average is the more settled of the two.
NHD ships an update every 11 months, Keystone Connection every 6 weeks. The most recent releases landed on November 2, 2026 and November 12, 2026 respectively.
| Parameter | NHD | Keystone Connection |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (6 ratings) — better | 1.4 (59 ratings) |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 6 | 59 — better |
| Update frequency | Every 11 months | Every 6 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 44 MB | 109 MB |
| Age rating | 4+ | 4+ |
| Developer | Sacramento County Office of Education | CINC Systems |
Customer experience
NHD
Keystone Connection
In-app purchases
NHD
No in-app purchases
Keystone Connection
No in-app purchases
Questions
Is NHD free?
Is Keystone Connection free?
Which has better reviews, NHD or Keystone Connection?
Do NHD or Keystone Connection have ads?
Which is updated more often, NHD or Keystone Connection?
Other comparisons
