Polismart vs Let's Build Countdowns
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Polismart
This app monitors and controls radiation levels using compatible devices. It provides real-time data, alerts for exceeding thresholds, and various operational modes for users to understand and manage radiation exposure.
- Radiation control and monitoring
- Compatible with Polimaster detectors
- Real-time radiation level measurement
- Threshold exceeded alerts
- Dashboard, Track, History, World Map modes
- User-friendly operation
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Polismart® is a mobile app for radiation control and monitoring. Polismart is compatible with Radiation Detectors and Dosimeters designed and manufactured by Polimaster – RadFlash®, PM1703®, PoliPack™, PM1605BT, PM1904A – which continuously monitor and measure the level of ionizing radiation and warn the user (alarm) when the preset thresholds are exceeded Users do not need to be experts in health physics to operate the instruments together with Polismart; however, understanding of basic principles of ionizing radiation is desirable for proper operation. The Polismart app has five different modes: - Dashboard - Track - History - World Map - Settings Polimaster®, Polismart®, PoliPack™, and RadFlash® are trademarks and/or registered trademarks of Polimaster, Inc. and its licensors. Data safety Polimaster, Inc. Polismart® Flash Mobile Application Privacy Policy and End User License Agreement And Terms of Use are published at https://polimaster.us/terms-privacy-policy-us/ (POLISMART® FLASH MOBILE APP PRIVACY POLICY and POLISMART® FLASH MOBILE APP EULA respectively). Before you operate the product for the first time, please carefully read the EULA, as starting to operate the product constitutes your consent to be bound by and become a party to the EULA. By operating the product, you agree that the EULA is enforceable like any written negotiated agreement signed by you. If you do not agree to all of the terms of the EULA, you are not allowed to operate the product.
Let's Build Countdowns
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Let’s Build Countdowns helps you look forward to the Moments that matter. Add birthdays, holidays, school trips, family visits, Christmas, weekends away, or anything else you are excited about. Then keep your next Moment close with bright, friendly widgets for your Home Screen and Lock Screen. Built around anticipation, Let’s Build Countdowns makes it simple to see what is coming next without turning it into a calendar, planner, or complicated productivity tool. Features: • Add your own Moments in seconds • Start quickly with family-friendly Moment templates • See your Next Up Moment at a glance • Choose icons and colours for each Moment • Show selected Moments in widgets • Home Screen widgets in multiple sizes • Lock Screen widgets • Local-first design with no accounts required Whether it is a birthday, a holiday, a school break, a family visit, or a special day you cannot wait for, Let’s Build Countdowns helps make the waiting part feel fun.
Screenshots
Verdict
The clearest difference is in-app purchases: Polismart at none against Let's Build Countdowns's 1. Polismart also leads on iOS requirement (13.0 vs 17.0). Let's Build Countdowns's advantage is update cadence (every 8 days vs every 4 months). On price, ads 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. Let's Build Countdowns sells 1 one-off in-app purchase. Polismart asks for nothing beyond the download.
Polismart ships an update every 4 months, Let's Build Countdowns every 8 days. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.
| Parameter | Polismart | Let's Build Countdowns |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 4 months | Every 8 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 22 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Polimaster Inc. | Brian Leary |
In-app purchases
Polismart
No in-app purchases
Let's Build Countdowns
- Countdown Plus$2.99
Questions
Is Polismart free?
Is Let's Build Countdowns free?
Do Polismart or Let's Build Countdowns have ads?
Which is updated more often, Polismart or Let's Build Countdowns?
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