# altimeter professional vs LingGrid

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.

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.

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.

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.

## The numbers

| Metric | altimeter professional | LingGrid |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (20 ratings)](https://appshunter.io/ios/app/altimeter-professional/id1033563012/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/linggrid/id6774998894/reviews)** |
| Number of ratings | **20** | 1 |
| Positive reviews | 61.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 67 months | **Every 9 days** |
| Monetization | Free | Free |
| Size | 27 MB | 4 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [FFZ srl](https://appshunter.io/developer/533499912) | [华明 罗](https://appshunter.io/developer/1670053427) |

## What reviewers say

### altimeter professional

[App page](https://appshunter.io/ios/app/altimeter-professional/id1033563012)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium 1 Month | $1.99 | per month |
| Premium 6 Months | $6.99 | per 6 months |
| Premium 1 Year | $11.99 | per year |


### LingGrid

[App page](https://appshunter.io/ios/app/linggrid/id6774998894)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*