# UDI Maps vs Viet EV

The clearest difference is rating: Viet EV at 3.0 against UDI Maps's 2.3. Viet EV also leads on update cadence (fortnightly vs every 2 months). UDI Maps's advantage is iOS requirement (9.0 vs 17.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Viet EV holds the better App Store score, 3.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

UDI Maps ships an update every 2 months, Viet EV fortnightly. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | UDI Maps | Viet EV |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/udi-maps/id1267260074/reviews) | **[3.0 (2 ratings)](https://appshunter.io/ios/app/viet-ev-ev-charging-map/id6749254230/reviews)** |
| Number of ratings | **3** | 2 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 62 MB | 23 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Urban Drainage Ho Chi Minh City Company Limited](https://appshunter.io/developer/1267260073) | [NEOLAB TECHNOLOGY COMPANY LIMITED](https://appshunter.io/developer/1829603265) |

## What reviewers say

### UDI Maps

[App page](https://appshunter.io/ios/app/udi-maps/id1267260074)

This app provides real-time flood information and navigation assistance for Ho Chi Minh City. Users can view current flood status, receive warnings, and find alternative routes to avoid flooded areas. It also allows users to report flood locations and provide feedback for app improvement.

**Highlights:** Real-time flood status updates, Navigation with alternative routes, Flood warnings and alerts, User reporting of flood locations, Traffic map integration, Emergency notifications

**Features:** macOS Compatibility

**In-app purchases:** none


### Viet EV

[App page](https://appshunter.io/ios/app/viet-ev-ev-charging-map/id6749254230)

This app helps electric vehicle owners in Vietnam locate and navigate to charging stations nationwide. It offers smart filters, real-time availability, and trip planning based on your vehicle and route. Users can also contribute data to improve the charging network.

**Highlights:** Nationwide charging station map, Smart filters for charger type and price, Seamless navigation integration, Automated trip planner, Real-time charger availability, User contributions and reporting

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

**In-app purchases:** none


## Frequently asked questions

### Is UDI Maps free?

UDI Maps is free to download, with no in-app purchases.

### Is Viet EV free?

Viet EV is free to download, with no in-app purchases.

### Which has better reviews, UDI Maps or Viet EV?

Viet EV is rated higher. UDI Maps averages 2.3 out of 5 from 3 ratings, while Viet EV averages 3.0 from 2 ratings.

### Do UDI Maps or Viet EV have ads?

Neither UDI Maps nor Viet EV shows ads.

### Which is updated more often, UDI Maps or Viet EV?

UDI Maps ships an update every 2 months, and Viet EV fortnightly. Most recently, UDI Maps was updated on October 24, 2026 and Viet EV on October 30, 2026.

---

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