# Hydrawise vs SurvivalKnife

The clearest difference is in-app purchases: Hydrawise at none against SurvivalKnife's 2. Hydrawise also leads on ratings volume (67K vs 1). SurvivalKnife's advantage is rating (5.0 vs 4.7) and update cadence (every 10 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. SurvivalKnife sells 2 in-app purchases, starting at $19.99 per year. Hydrawise asks for nothing beyond the download.

SurvivalKnife holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Hydrawise has 67K ratings behind it against 1, so its average is the more settled of the two.

Hydrawise ships an update every 3 weeks, SurvivalKnife every 10 days. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Hydrawise | SurvivalKnife |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (67K ratings)](https://appshunter.io/ios/app/hydrawise/id1618847331/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/survivalknife/id6777308743/reviews)** |
| Number of ratings | **67K** | 1 |
| Positive reviews | 39.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 143 MB | 170 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Hunter Industries](https://appshunter.io/developer/710090127) | [Atherton Labs LLC](https://appshunter.io/developer/6777308745) |

## What reviewers say

### Hydrawise

[App page](https://appshunter.io/ios/app/hydrawise/id1618847331)

Optimize your irrigation with intelligent watering schedules based on local weather forecasts. This app helps conserve water while ensuring your landscape stays healthy and vibrant. Manage your irrigation system remotely for ultimate convenience.

**Highlights:** Predictive Watering™, Local weather insights, Water savings optimization, Lush landscape creation, Remote irrigation management

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to use
- 🚀 Improved performance
- 💡 Useful features like weather-based watering
- 🔒 Secure system

**What reviewers complain about**

- 🐛 Connectivity issues
- 👎 Confusing user interface
- 🔍 Difficult to find/access certain features
- 📉 Lack of important functionality from previous app

**Reported bugs**

- App crashes on launch
- Zones not starting as scheduled
- Incorrect flow rate and water usage data

**Requested features**

- Ability to pause/resume programs
- Customizable watering schedules
- Improved reporting and historical data
- Easier manual zone control


### SurvivalKnife

[App page](https://appshunter.io/ios/app/survivalknife/id6777308743)

This app helps you create personalized emergency preparedness plans for your household, considering individual needs and local hazards. It offers offline maps, routing, and inventory management, ensuring you're ready even without cell service.

**Highlights:** Personalized household emergency plans, Offline maps and turn-by-turn routing, Inventory tracking and readiness scoring, Household records and printable cards, Private encrypted vault for documents, Real-time local hazard notifications, Daily survival lessons and field guide

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Field Edition | $19.99 | per year |
| Family Edition | $39.99 | per year |


## Frequently asked questions

### Is Hydrawise free?

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

### Is SurvivalKnife free?

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

### Which has better reviews, Hydrawise or SurvivalKnife?

SurvivalKnife is rated higher. Hydrawise averages 4.7 out of 5 from 67K ratings, while SurvivalKnife averages 5.0 from 1 ratings.

### Do Hydrawise or SurvivalKnife have ads?

Neither Hydrawise nor SurvivalKnife shows ads.

### Which is updated more often, Hydrawise or SurvivalKnife?

Hydrawise ships an update every 3 weeks, and SurvivalKnife every 10 days. Most recently, Hydrawise was updated on November 1, 2026 and SurvivalKnife on October 29, 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.*