# NVS Tsunami Evacuation vs Bontub

The clearest difference is update cadence: Bontub at every 5 weeks against NVS Tsunami Evacuation's every 3 months. Bontub also leads on iOS requirement (11.0 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.

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

NVS Tsunami Evacuation ships an update every 3 months, Bontub every 5 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | NVS Tsunami Evacuation | Bontub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (19 ratings)](https://appshunter.io/ios/app/nvs-tsunami-evacuation/id478984841/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 44.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Monetization | Free | — |
| Size | 7 MB | 52 MB |
| Requires iOS | 16.6 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [NANOOS-IOOSASSOCIATION](https://appshunter.io/developer/1792959921) | [Polygram Solution Co., Ltd.](https://appshunter.io/developer/1732614931) |

## What reviewers say

### NVS Tsunami Evacuation

[App page](https://appshunter.io/ios/app/nvs-tsunami-evacuation/id478984841)

This app displays tsunami evacuation zones along the Oregon and Washington coast. It allows users to map their home, work, or school to see if they are in a hazard zone and plan evacuation routes. It also shows critical locations like schools and government buildings.

**Highlights:** Tsunami evacuation zone maps, Location mapping (home, work, school), GPS and address-based route planning, Critical facility locations, Tsunami warning bulletins, State agency data

**Features:** macOS Compatibility

**In-app purchases:** none


### Bontub

[App page](https://appshunter.io/ios/app/bontub/id6443792923)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is NVS Tsunami Evacuation free?

NVS Tsunami Evacuation is free to download, with no in-app purchases.

### Is Bontub free?

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

### Do NVS Tsunami Evacuation or Bontub have ads?

Neither NVS Tsunami Evacuation nor Bontub shows ads.

### Which is updated more often, NVS Tsunami Evacuation or Bontub?

NVS Tsunami Evacuation ships an update every 3 months, and Bontub every 5 weeks. Most recently, NVS Tsunami Evacuation was updated on November 1, 2026 and Bontub on November 3, 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.*