VisuCaller vs LSI Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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 descriptionHide 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.
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.
- Water science education
- Pool and spa water management
- Eco-friendly treatment guidance
- NSF/ANSI Certified product information
- Tools for water system management
Read full descriptionHide 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
Verdict
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
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.
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.
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.
| Parameter | VisuCaller | LSI Calculator |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.6 (12 ratings) — better | 4.4 (5 ratings) |
| Positive reviews | 75.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 12 — better | 5 |
| Update frequency | Every 15 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 52 MB |
| Age rating | 4+ | 12+ |
| Developer | iRead Solutions Inc. | Pure Planet Science & Technology, Inc. |
Customer experience
VisuCaller
LSI Calculator
In-app purchases
VisuCaller
- Contact Support$1.99
LSI Calculator
No in-app purchases
Questions
Is VisuCaller free?
Is LSI Calculator free?
Which has better reviews, VisuCaller or LSI Calculator?
Do VisuCaller or LSI Calculator have ads?
Which is updated more often, VisuCaller or LSI Calculator?
Other comparisons















