# Realtime Altimeter vs 古迹寻声

The clearest difference is price: Realtime Altimeter at Free against 古迹寻声's $0.99. Realtime Altimeter also leads on iOS requirement (13 vs 15.2). 古迹寻声's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Realtime Altimeter is free to download; 古迹寻声 costs $0.99 up front. Realtime Altimeter sells 1 one-off in-app purchase. 古迹寻声 asks for nothing beyond the download.

Realtime Altimeter ships an update every 2 weeks, 古迹寻声 every 2 days. The most recent releases landed on October 19, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Realtime Altimeter | 古迹寻声 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.7 (403 ratings)](https://appshunter.io/ios/app/realtime-altimeter/id1039285626/reviews)** | — |
| Number of ratings | **403** | — |
| Positive reviews | 76.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 42 MB |
| Requires iOS | **13** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zhenlai Xia](https://appshunter.io/developer/1435731218) | [恩粉 杨](https://appshunter.io/developer/1853709407) |

## What reviewers say

### Realtime Altimeter

[App page](https://appshunter.io/ios/app/realtime-altimeter/id1039285626)

This app provides real-time altitude readings, even without an internet connection. It also includes a compass, velocimeter, and a camera that can watermark photos with location data, making it ideal for travelers and outdoor adventurers.

**Highlights:** Offline altimeter, Real-time altitude, Integrated compass, Velocimeter for speed, Watermark camera with GPS data

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |

**What reviewers like**

- 📸 Captures photos with altitude watermark
- ✈️ Useful for travel and outdoor activities
- 🆓 Free to use
- 👍 Very practical and useful
- 📍 Provides location and altitude information

**What reviewers complain about**

- 🧭 Compass missing East/West points
- 📉 Barometric pressure inaccurate
- ⚖️ Altitude readings fluctuate
- 📷 Cannot take landscape photos
- 📶 Not always immediate altitude reaction without network

**Reported bugs**

- Compass missing cardinal points
- Inaccurate barometric pressure readings
- Fluctuating and inaccurate altitude readings
- Watch app not installing after purchase
- Altimeter not working during flight

**Requested features**

- Announce current altitude based on time or altitude
- Larger font size for speed readout
- Option to switch altitude and speed display positions
- Convert camera location address to text
- Add barometric pressure display


### 古迹寻声

[App page](https://appshunter.io/ios/app/id6755434708)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Realtime Altimeter free?

Realtime Altimeter is free to download, with in-app purchases available.

### Is 古迹寻声 free?

古迹寻声 costs $0.99, with no in-app purchases.

### Do Realtime Altimeter or 古迹寻声 have ads?

Realtime Altimeter shows ads; 古迹寻声 does not.

### Which is updated more often, Realtime Altimeter or 古迹寻声?

Realtime Altimeter ships an update every 2 weeks, and 古迹寻声 every 2 days. Most recently, Realtime Altimeter was updated on October 19, 2026 and 古迹寻声 on October 16, 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.*