Comparison

altimeter professional vs LingGrid

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

Head to head
About

altimeter professional

This app provides highly accurate altitude and position detection using GPS and barometric sensors. It features a graphical analog display with digital readings, tracks maximum altitude reached, and allows users to calibrate readings. You can also take and share photos with location data or send emergency SMS messages with GPS coordinates.

Highlights
  • Accurate altitude and position detection
  • Analog and digital display
  • Maximum altitude tracking
  • Photo capture with altitude and location
  • Emergency SMS with GPS coordinates
  • Altitude calibration
  • Meters or feet display
Features
Read full description

The professional altimeter with automatic altitude detection that works even without an internet connection! With the professional altimeter app, you can find out the actual altitude of the place where you are. The app automatically displays the altitude using a complex algorithm that combines three measurement methods: * Through satellite triangulation (also works without an internet connection) * Through map altitude, retrieving the terrain elevation for your location * Through the pressure sensor (if available), calibrated using the nearest weather station Carefully designed from a graphical perspective, the app recreates an analog altimeter (in meters or feet) with a digital measurement display. Here are some of the features: * Automatic altitude measurement (with the option to manually select one of the three measurement methods: [Map Altitude, Flight Altitude, GPS Altitude]) * History function with route tracking on the map and elevation-change graphs [works even when the app is closed], with indicators for speed, average speed, and elevation gain * Photo gallery of your routes with data overlaid on the photos * Alert system for sending your location by message or SMS in case of need * Weather forecast with trend information, temperature, and humidity measurements * Photos with overlaid data, location, and altitude * Custom widget to add to your Home Screen With the additional Premium feature, you can: * Remove advertisements * Remove the branding from photos OPTIONAL SUBSCRIPTION Only if you want to, you can activate the Premium version to remove ads and the watermark from photos: 1 month, 6 months or 1 year. Payment will be charged to your Apple Account upon confirmation of purchase. The subscription automatically renews unless cancelled at least 24 hours before the end of the current period; you can manage or turn it off in your account settings. Privacy Policy: https://www.mailant.it/privacyapp/privacyAltimetro.htm Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

LingGrid

This app provides a secure digital backup for physical dynamic password cards used for the Jiangsu Gaokao. It allows users to scan or import card images, save encrypted data locally, and quickly look up codes by selecting coordinates. Designed to reduce stress during critical post-exam processes.

Highlights
  • Scan physical password cards
  • Import photos from album
  • Recognize 8x8 password grid
  • Save encrypted data locally
  • Quick code lookup by coordinates
  • Digital backup for password cards
Features
Read full description

LingGrid is a local security app designed for Jiangsu Gaokao dynamic password cards. It currently focuses on the 8×8 physical password card used for the Jiangsu Gaokao. You can scan the card with your camera or import a photo from your album. LingGrid recognizes the 8×8 password grid and lets you review every cell before saving. When you need to look up a code, simply select the coordinates shown on the website or system page, and LingGrid will combine them into the corresponding dynamic password. LingGrid was created by the parent of a 2026 Jiangsu Gaokao student. The idea came from a very real moment at home. That small physical password card quietly accompanies students and parents through some of the most important moments after the exam: checking scores, submitting college preferences, and confirming admission results. It may not be noticed every day, but when it is needed, it matters deeply. If the card is lost, it can be reissued, but every minute of waiting can feel heavy. So I wanted to create a safe digital backup for the physical card, giving it a reliable companion on the phone. Not to replace the card, but to offer one more layer of preparation and a little more calm when it matters. All password card data is encrypted and saved locally by default. LingGrid does not upload original images, coordinates, or password contents. It is built to make lookup faster while respecting privacy and security. LingGrid is dedicated to every student and parent going through the Gaokao journey. It will always be free, with no fees. May every lookup bring a little less panic and a little more confidence. Please note: LingGrid is not an official app and does not replace the official channels of the Jiangsu Provincial Education Examination Authority. Please continue to keep your physical password card and login password safe.

Screenshots

altimeter professional4 screens
LingGrid4 screens

Verdict

The call

The clearest difference is rating: LingGrid at 5.0 against altimeter professional's 4.0. LingGrid also leads on review sentiment (100% vs 61%) and in-app purchases (none vs 3). altimeter professional's advantage is ratings volume (20 vs 1). On price, monetization model, device support and iOS requirement 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. altimeter professional sells 3 in-app purchases, starting at $1.99 per month. LingGrid asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

LingGrid holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: altimeter professional has 20 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 61% of altimeter professional's written reviews are positive against 100% of LingGrid's.

UpkeepUpdate frequency

altimeter professional ships an update every 67 months, LingGrid every 9 days. The most recent releases landed on October 17, 2026 and October 8, 2026 respectively.

Scorecard6 real differences · 4 level
altimeter professional versus LingGrid: the parameters behind the verdict, then further details
Parameteraltimeter professionalLingGrid
PriceFreeFree
Rating4.0 (20 ratings)5.0 (1 ratings) — better
Positive reviews61.0% of reviews100.0% of reviews — better
Number of ratings20 — better1
Update frequencyEvery 67 monthsEvery 9 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.017.0
Further details — not scored
Size27 MB4 MB
Age rating4+4+
DeveloperFFZ srl华明 罗

Customer experience

altimeter professional

All ratings20 ratings
Positive65.0%
Neutral20.0%
Negative15.0%
Written reviews59 reviews
Positive61.0%
Neutral8.5%
Negative30.5%

LingGrid

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

altimeter professional

Subscriptions3
  • Premium 1 Month$1.991 Month
  • Premium 6 Months$6.996 Months
  • Premium 1 Year$11.991 Year
None

LingGrid

No in-app purchases

Questions

Is altimeter professional free?
altimeter professional is free to download, with in-app purchases available.
Is LingGrid free?
LingGrid is free to download, with no in-app purchases.
Which has better reviews, altimeter professional or LingGrid?
LingGrid is rated higher. altimeter professional averages 4.0 out of 5 from 20 ratings, while LingGrid averages 5.0 from 1 ratings.
Do altimeter professional or LingGrid have ads?
altimeter professional shows ads; LingGrid does not.
Which is updated more often, altimeter professional or LingGrid?
altimeter professional ships an update every 67 months, and LingGrid every 9 days. Most recently, altimeter professional was updated on October 17, 2026 and LingGrid on October 8, 2026.

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