Comparison

VisuCaller vs LSI Calculator

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

Head to head
About

VisuCaller

Easily scan and call printed phone numbers directly from your device. Enhance functionality with an in-app purchase to scan contact details from images or the viewfinder, saving them to your contacts or custom lists. Manage information efficiently for various needs.

Highlights
  • Scan printed phone numbers
  • Scan contact info from images
  • Scan contact info from viewfinder
  • Save scanned contacts
  • Create custom contact lists
  • Automatic calling for detected numbers
  • Zoom control for scanning
Read full description

VisuCaller scans and calls printed phone numbers. An inapp purchases allows it to also scan contact information from the viewfinder or from a picture which can be saved to your device's contacts or an app list. For the phone tab, a viewfinder is used to enclose data to be scanned and phone numbers detected from the data are displayed in a list. If a number is detected multiple times quickly, the App will highlite it in green and can automatically initiate calling it (if enabled in settings). You can edit phone numbers in the list to add prefix codes or correct errors. Zoom control is provided using pinch gestures or double tapping. For the contacts tab (in app purchase), data can be detected by taking one or more pictures and/or using viewfinder for scanning smaller specific information. With either method, detected information is displayed in a list. The list shows hints of the types of contact information that can be scanned and you scan only the data you desire. If data is detected multiple times in succession, the App will highlite it in green, which is an indication the data has a high probability of being accurate. Specific list rows can be selected which will bias the viewfinder scanner to the particular data expected for the list row, which can improve detection ability. If you simply want to scan data but not save it, you simply tap the item once scanned to get map directions, email or browse a website. The list tab permits managing personal lists in the app. This is handy for information you may want to note but not necessarily save in your device's contacts to avoid cluttering. For example, you may take a trip once, need various pieces of contact information available but once the trip is finished, you may never need that information again. You can simply delete the list when the trip is done. This is much easier than going through your contacts and deciding what you need to delete. Common user interactions are : - tap viewfinder to refocus - swipe across viewfinder to clear list data and rescan - tap a camera button to take a photo for data to be processed for contact information - drag list handle up/down to stop/start camera scanning using the viewfinder - double tap viewfinder to cycle zoom levels ( 1.0, 1.5, 2.0, 1.0 ...) - pinch zoom control - tap a list item to action ( make a call, browse a website, email, get map directions) - tap a list item to add it to information in a contact row - hold a list item to edit Note that this app uses OCR technology and only works with printed English text (not handwritten text) and cannot guarantee information is always scanned without errors. If the printed text is clear, characters are not touching or overlapping, it will very often detect correctly.

About

LSI Calculator

This app provides tools and educational resources to help users manage water systems, focusing on eco-friendly treatments for pools and spas. It aims to make water maintenance accessible to everyone, regardless of their experience level.

Highlights
  • Water science education
  • Pool and spa water management
  • Eco-friendly treatment guidance
  • NSF/ANSI Certified product information
  • Tools for water system management
Features
Read full description

Next Generation Water Science makes water (and the people who maintain it) look great. Next Generation Water Science makes eco-friendly water treatments for pools, spas, industrial and agricultural water systems. All products are NSF/ANSI Certified for purity and safety. Through education and helpful tools like this mobile app, Next Generation Water Science has helped people of all aptitudes manage water better.

Screenshots

VisuCaller4 screens
LSI Calculator3 screens

Verdict

The call

The clearest difference is price: LSI Calculator at Free against VisuCaller's $1.99. LSI Calculator also leads on in-app purchases (none vs 1) and update cadence (every 2 months vs every 15 months). On rating, ratings volume, 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

LSI Calculator is free to download; VisuCaller costs $1.99 up front. VisuCaller sells 1 one-off in-app purchase. LSI Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

VisuCaller holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 12 and 5 respectively. Written reviews complicate that: 75% of VisuCaller's written reviews are positive against 100% of LSI Calculator's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

VisuCaller ships an update every 15 months, LSI Calculator every 2 months. The most recent releases landed on October 23, 2026 and October 5, 2026 respectively.

Scorecard6 real differences · 4 level
VisuCaller versus LSI Calculator: the parameters behind the verdict, then further details
ParameterVisuCallerLSI Calculator
Price$1.99Free — better
Rating4.6 (12 ratings) — better4.4 (5 ratings)
Positive reviews75.0% of reviews100.0% of reviews — better
Number of ratings12 — better5
Update frequencyEvery 15 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.011.0 — better
Further details — not scored
Size7 MB52 MB
Age rating4+12+
DeveloperiRead Solutions Inc.Pure Planet Science & Technology, Inc.

Customer experience

VisuCaller

All ratings12 ratings
Positive91.7%
Neutral8.3%
Negative0.0%
Written reviews32 reviews
Positive75.0%
Neutral3.1%
Negative21.9%

LSI Calculator

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

VisuCaller

One-time1
  • Contact Support$1.99
None

LSI Calculator

No in-app purchases

Questions

Is VisuCaller free?
VisuCaller costs $1.99, and also offers in-app purchases.
Is LSI Calculator free?
LSI Calculator is free to download, with no in-app purchases.
Which has better reviews, VisuCaller or LSI Calculator?
VisuCaller is rated higher. VisuCaller averages 4.6 out of 5 from 12 ratings, while LSI Calculator averages 4.4 from 5 ratings.
Do VisuCaller or LSI Calculator have ads?
Neither VisuCaller nor LSI Calculator shows ads.
Which is updated more often, VisuCaller or LSI Calculator?
VisuCaller ships an update every 15 months, and LSI Calculator every 2 months. Most recently, VisuCaller was updated on October 23, 2026 and LSI Calculator on October 5, 2026.

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