NHD vs PDI Mobile
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!
PDI Mobile
This business application enhances functionality for canvassing projects. It offers seamless integration with existing workflows, improving efficiency for users involved in political data collection and management.
- Enhanced canvassing functionality
- Seamless integration
- Improved workflow efficiency
- Data management tools
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The new PDI Mobile App is an app with enhanced functionality that can be used seamlessly with existing canvassing projects.
Screenshots
Verdict
The clearest difference is rating: NHD at 4.7 against PDI Mobile's 3.5. PDI Mobile's advantage is ads (none vs shown) and update cadence (weekly vs every 11 months). On price, ratings volume, 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 3.5. Both are backed by a comparable volume of ratings — 6 and 10 respectively.
NHD ships an update every 11 months, PDI Mobile weekly. The most recent releases landed on September 15, 2026 and September 9, 2026 respectively.
| Parameter | NHD | PDI Mobile |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (6 ratings) — better | 3.5 (10 ratings) |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 6 | 10 — better |
| Update frequency | Every 11 months | Weekly — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Best chart rank | — | #127 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 14.0 |
| Further details — not scored | ||
| Size | 44 MB | 100 MB |
| Age rating | 4+ | 17+ |
| Developer | Sacramento County Office of Education | Political Data Inc. |
Customer experience
NHD
PDI Mobile
In-app purchases
NHD
No in-app purchases
PDI Mobile
No in-app purchases
