# SISMO® vs i4cast

The clearest difference is device support: i4cast at 3 against SISMO®'s 1. i4cast also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, 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.

SISMO® ships an update monthly, i4cast every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | SISMO® | i4cast |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | — | Free |
| Size | 23 MB | 34 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | +4 |
| Developer | [Hidromares](https://appshunter.io/developer/1018949738) | [i4sea](https://appshunter.io/developer/1465314038) |

## What reviewers say

### SISMO®

[App page](https://appshunter.io/ios/app/sismo/id1260280220)

**In-app purchases:** none


### i4cast

[App page](https://appshunter.io/ios/app/i4cast/id1600695099)

This app provides automatic alerts for impact-risk events in your operations. It optimizes communication by notifying the right people at the right time, enhancing situational awareness and planning efficiency.

**Highlights:** Automatic impact-risk event alerts, Optimized communication, Targeted notifications, Situational awareness, Time saving, Planning efficiency

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

**In-app purchases:** none


## Frequently asked questions

### Is SISMO® free?

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

### Is i4cast free?

i4cast is free to download, with no in-app purchases.

### Do SISMO® or i4cast have ads?

Neither SISMO® nor i4cast shows ads.

### Which is updated more often, SISMO® or i4cast?

SISMO® ships an update monthly, and i4cast every 2 months. Most recently, SISMO® was updated on November 2, 2026 and i4cast 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.*