Comparison

Polismart vs Let's Build Countdowns

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Let's Build Countdowns

Features
Read full description

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

Polismart4 screens
Let's Build Countdowns4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Let's Build Countdowns sells 1 one-off in-app purchase. Polismart asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Polismart versus Let's Build Countdowns: the parameters behind the verdict, then further details
ParameterPolismartLet's Build Countdowns
PriceFreeFree
Rating3.0 (2 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 4 monthsEvery 8 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size22 MB2 MB
Age rating4+4+
DeveloperPolimaster Inc.Brian Leary

In-app purchases

None

Polismart

No in-app purchases

1 purchases

Let's Build Countdowns

One-time1
  • Countdown Plus$2.99

Questions

Is Polismart free?
Polismart is free to download, with no in-app purchases.
Is Let's Build Countdowns free?
Let's Build Countdowns is free to download, with in-app purchases available.
Do Polismart or Let's Build Countdowns have ads?
Neither Polismart nor Let's Build Countdowns shows ads.
Which is updated more often, Polismart or Let's Build Countdowns?
Polismart ships an update every 4 months, and Let's Build Countdowns every 8 days. Most recently, Polismart was updated on October 23, 2026 and Let's Build Countdowns on October 24, 2026.

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