CampusGuard911 vs π Pi Challenge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CampusGuard911
This safety app provides a direct panic button for university faculty and staff during emergencies. It alerts local law enforcement and campus personnel, displaying the location of the incident. The app also notifies nearby protected locations.
- Mobile panic button
- Alerts law enforcement
- Campus-wide alerts
- Location mapping
- Notifies nearby locations
- AT&T FirstNet listed
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CampusGuard911 is a mobile panic button app for university and college faculty and staff. In the event of an active campus shooting emergency, a faculty or staff member presses the main CampusGuard911 panic button. As the app is dialing 911, an alert is immediately sent to the smartphones of all federal, state and local, ON and OFF duty, law enforcement officers who are in close proximity to the school and who belong to the Hero911 Network. Additionally, an intra-campus alert is simultaneously sent to the smartphones of all faculty and staff and a mapped location of the initial alert is displayed (mapping depends on cell coverage). CampusGuard911 also alerts all other protected locations within a 5 mile radius of the initial alert. CampusGuard911 is also listed in the AT&T FirsNet App Catalog as an emergency app for first responders. Please be aware that continued use of GPS running in the background can dramatically decrease battery life.
π Pi Challenge
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An app for memorizing the digits of Pi. It supports up to 30 million digits… totally unnecessary, but fun. Comes with a ranking feature! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: CampusGuard911 at none against π Pi Challenge's 1. CampusGuard911 also leads on ads (none vs shown). π Pi Challenge's advantage is update cadence (every 2 months vs every 6 months). On price, device support and iOS requirement 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. π Pi Challenge sells 1 in-app purchase, starting at $0.99 per month. CampusGuard911 asks for nothing beyond the download.
CampusGuard911 ships an update every 6 months, π Pi Challenge every 2 months. The most recent releases landed on October 24, 2026 and October 5, 2026 respectively.
| Parameter | CampusGuard911 | π Pi Challenge |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 58 MB | 73 MB |
| Age rating | 4+ | 4+ |
| Developer | Guard911, LLC | SIC Company Limited |
In-app purchases
CampusGuard911
No in-app purchases
π Pi Challenge
- Monthly Subscription$0.991 Month
Questions
Is CampusGuard911 free?
Is π Pi Challenge free?
Do CampusGuard911 or π Pi Challenge have ads?
Which is updated more often, CampusGuard911 or π Pi Challenge?
Other comparisons
