Comparison

ViDiLabs Calc vs FlutterTime Timezone Converter

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

Head to head
About

ViDiLabs Calc

This app calculates necessary camera lens focal lengths and object distances for optimal pixel density, aiding in compliance with surveillance standards. It also estimates storage capacity for video recordings and helps analyze moving object blur for clearer image capture.

Highlights
  • Calculate required focal length and object distance
  • Determine required storage capacity
  • Pixel density calculation for identification and recognition
  • Database of commercially available sensors
  • Manual entry for custom variables
  • Moving object blur analysis
  • Pre-set pixel densities for common projects
Features
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The ViDi Labs calculator helps you calculate the required focal length lens on a camera, or suggested distance to an object, in order to achieve the required pixel density (read clarity), compliant with various standards. It also helps you calculate the required storage capacity for a given number of recording days or minutes (in case you need to export an incident on a USB flash drive). It consists of two sub-applications, one called Visual and the other Digital. Many surveillance standards or tenders would specify cameras in particular locations in a project so that facial identification or recognition is achieved at the particular area. To comply with such tenders is not easy because pixel density calculation depends on the sensor size, the focal length of the lens and the distance to the object, all interdependent. The ViDi Labs calculator has all the right formulas to do it for you.  It contains a database of all commercially available sensors, from the smallest up to the large format cameras (currently 102MP).  All you need to know is the sensor your camera uses. With the latest version 2.0 of this app we have introduced manual entry of any of the variables (by double-tapping a window), including distances or focal length that are not in the scrolling picker data-base, or perhaps you use an "unusual" or new sensor size. In the Pixel Density area of the pre-set buttons on the right hand-side we introduced the correct pixel densities for Face Identification (FI), Recognition (FR) and Inspection, as per the Australian Standard corrigendum document for the IEC 62676-4: 2015. In this version, the FI is now 350pix/m, instead of 250pix/m, and the FR is 175pix/m instead of 125pix/m. Similarly, for the Face Inspection we now have the value of 1400pix/m, instead of 1000pix/m.  These corrected numbers will help you design a better system. You can still enter, however, any value you desire by scrolling the window or manually entering by double-tapping. In addition to the "facial" pixel densities pre-set buttons, we have also introduced pixel densities pre-sets for common projects such as Licence Plates Recognition (LPR), money and playing cards. Please note that these values are from our own testing and experience, and they do not exist in any standard as such. The CCTV industry is not the only field of use for the ViDiLabs calculator, because this app can be used by anybody with a digital camera, be that in photography, cinematography, or in machine vision, as it can help find the best lens, distance and camera settings for the clearest image. In the same Visual section, the ViDi Labs calculator also calculates moving object blur as they are recorded with various exposures. Such calculations are first in the industry and could prove extremely useful in systems used for automatic face recognition, vehicles automatic licence plate reading, reading the roulette wheels winning numbers and all other moving objects that need to be seen more clearly. In the latest v.2.0 we introduced yet another new and unique calculations which considers the angle of the object motion relative to the optical axis. Under the Digital sub-application, the ViDi Labs calculator also calculates the recording storage capacity for a given number of cameras, chosen length of recording, percentage of VMD and compression. Users can also enter the type of storage required (RAID type) and the calculator will advise how many hard disks are required to achieve the chosen number of storage days. For the first time in the surveillance industry, it can also indicate the visual quality of the chosen compression by showing a simulation of the ViDi Labs test chart for the chosen compression (H.264 or JPG). Last, but not least, in the v.2.0 update, we have introduced calculating of the storage needed of a short event, typically lasting a few minutes, which needs to be exported to a USB flash drive for for further analysis by third party or Police for example.

About

FlutterTime Timezone Converter

Effortlessly manage global time zones with a visual timeline. This app simplifies scheduling for remote teams and travelers by showing time differences and availability at a glance. It offers precise time zone support and customizable labels without ads or tracking.

Highlights
  • Visual timeline for time zone alignment
  • At-a-glance status indicators
  • Support for unlimited locations
  • UTC, GMT, and Military (Zulu) time
  • Customizable clock labels
  • Dark Mode and Liquid Glass design
Features
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Scheduling calls across timezones is frustrating. It's especially difficult if you are traveling or working with someone remote. Having family across timezones compounds the issue. FlutterTime allows you to add your cities, then move forward and back in time across timezones using an intuitive timeline. It's simple clean, and tackles one problem without extra bloat. No more Googling "PST to London time" or second-guessing meeting starts. Just a smooth, elegant interface that stays out of your way. DESIGNED FOR CLARITY • Gliding Timeline: Scroll forward or backward to instantly see how hours align across multiple cities. • At-A-Glance Status: Visual indicators show you who is sleeping, who is working, and where the "sweet spot" for a meeting lies. • True Minimalism: No ads, no tracking, no clutter, and no unnecessary permissions. Just the time you need, exactly when you need it. POWERFUL UTILITY • Unlimited Locations: Track as many cities as you need—from New York to Tokyo. • Technical Precision: Includes support for UTC, GMT, and Military (Zulu) time for pilots and developers. • Custom Labels: Rename your clocks. Tag a location as "Home," "HQ," or "Dev Team." • Beautiful Aesthetics: Fully optimized for Dark Mode with a Liquid Glass design that feels native to your iPhone. PERFECT FOR • Remote Teams: Find the perfect overlap for Zoom or Slack calls without the back-and-forth. • Digital Nomads: Plan your next flight or travel itinerary with confidence. • Finance & Trading: Keep track of market opening hours across London, New York, and Hong Kong. • Aviation: Quick access to UTC/Zulu time for flight planning. Download FlutterTime today and master your world clock.

Screenshots

ViDiLabs Calc4 screens
FlutterTime Timezone Converter4 screens

Verdict

The call

The clearest difference is price: FlutterTime Timezone Converter at Free against ViDiLabs Calc's $18.99. FlutterTime Timezone Converter also leads on rating (4.9 vs 3.0) and update cadence (fortnightly vs every 4 months). ViDiLabs Calc's advantage is iOS requirement (12.0 vs 18.0). On ads and in-app purchases 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

FlutterTime Timezone Converter is free to download; ViDiLabs Calc costs $18.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

FlutterTime Timezone Converter holds the better App Store score, 4.9 against 3.0. That said, the two scores are not equally well evidenced: FlutterTime Timezone Converter has 21 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

ViDiLabs Calc ships an update every 4 months, FlutterTime Timezone Converter fortnightly. Both last shipped on October 2, 2026.

Scorecard7 real differences · 3 level
ViDiLabs Calc versus FlutterTime Timezone Converter: the parameters behind the verdict, then further details
ParameterViDiLabs CalcFlutterTime Timezone Converter
Price$18.99Free — better
Rating3.0 (1 ratings)4.9 (21 ratings) — better
Positive reviews—88.9% of reviews
Number of ratings121 — better
Update frequencyEvery 4 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPodiPhone, iPad, Mac, Apple Watch — better
Requires iOS12.0 — better18.0
Further details — not scored
Size9 MB3 MB
Age rating4+4+
DeveloperViDi Labs Pty LtdDBElement, LLC

Customer experience

ViDiLabs Calc

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%

FlutterTime Timezone Converter

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews9 reviews
Positive88.9%
Neutral0.0%
Negative11.1%

In-app purchases

None

ViDiLabs Calc

No in-app purchases

None

FlutterTime Timezone Converter

No in-app purchases

Questions

Is ViDiLabs Calc free?
ViDiLabs Calc costs $18.99, with no in-app purchases.
Is FlutterTime Timezone Converter free?
FlutterTime Timezone Converter is free to download, with no in-app purchases.
Which has better reviews, ViDiLabs Calc or FlutterTime Timezone Converter?
FlutterTime Timezone Converter is rated higher. ViDiLabs Calc averages 3.0 out of 5 from 1 ratings, while FlutterTime Timezone Converter averages 4.9 from 21 ratings.
Do ViDiLabs Calc or FlutterTime Timezone Converter have ads?
Neither ViDiLabs Calc nor FlutterTime Timezone Converter shows ads.
Which is updated more often, ViDiLabs Calc or FlutterTime Timezone Converter?
ViDiLabs Calc ships an update every 4 months, and FlutterTime Timezone Converter fortnightly. Most recently, ViDiLabs Calc was updated on October 2, 2026 and FlutterTime Timezone Converter on October 2, 2026.

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