Sentry vs PAAT
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sentry
Enhances situational awareness for law enforcement and first responders involved in alarm monitoring strategies. It supports partnerships with government and businesses to protect strategic assets globally.
- Elevates situational awareness
- Supports alarm monitoring strategies
- Partners with government and first responders
- Protects strategic assets globally
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Sentry-SECURE elevates situational awareness amongst law enforcement stakeholders that are critical to the alarm monitoring strategies being implemented by the Office of Radiological Security’s Protect strategy. The Office of Radiological Security uses these strategies to partner with government, first responders, and businesses to protect strategic assets around the world.
PAAT
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PAAT was developed to enhance the capabilities of States in assessing radiation alarms triggered by a person. In most cases, the reason the person will set off an alarm is a medical treatment or diagnostic procedure involving the administration of a radiopharmaceutical. When a radiation alarm is triggered by a person, PAAT can be used by the investigating officer to conduct a simple interview and measurement. The information in the App provides assistance for the investigating officers in States in the assessment of radiation alarms caused by persons to more effectively and efficiently combat the movement of nuclear and other radioactive materials out of regulatory control at points of entry and major public events (MPE). Note: • The App does not collect any identifying personal data. • The dose estimates in the App are for standard models and should not be considered patient-specific under any circumstances. • The assessment results shall be used only for nuclear security purposes. • The App has not been extensively tested on all platforms, under all conditions. As such, users of this tool must verify all results prior to decision making.
Screenshots
Verdict
The clearest difference is update cadence: PAAT at every 3 weeks against Sentry's every 3 months. PAAT also leads on iOS requirement (13.0 vs 16.6). On price, ads, 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.
Sentry ships an update every 3 months, PAAT every 3 weeks. The most recent releases landed on August 10, 2026 and September 9, 2026 respectively.
| Parameter | Sentry | PAAT |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (6 ratings) — better | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 56 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | VPI Engineering | IAEA |
In-app purchases
Sentry
No in-app purchases
PAAT
No in-app purchases







