# FDS Altis vs Waft

The clearest difference is update cadence: FDS Altis at every 3 weeks against Waft's every 2 months. Waft's advantage is iOS requirement (15.1 vs 26.2). 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.

FDS Altis ships an update every 3 weeks, Waft every 2 months. Both last shipped on October 19, 2026.

## The numbers

| Metric | FDS Altis | Waft |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (10 ratings)](https://appshunter.io/ios/app/fds-altis/id1254991988/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 16 MB | 37 MB |
| Requires iOS | 26.2 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Casey Mongoven](https://appshunter.io/developer/1254991987) | [Lavender Ink LLC](https://appshunter.io/developer/1896600055) |

## What reviewers say

### FDS Altis

[App page](https://appshunter.io/ios/app/fds-altis/id1254991988)

Access the instructional manual for your product and connect to the system. By using this application, you agree to the Terms of Service and Privacy Policy.

**Highlights:** Product instructional manual access, System connection, Terms of Service agreement, Privacy Policy agreement

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

**In-app purchases:** none


### Waft

[App page](https://appshunter.io/ios/app/waft-reed-diffuser-calculator/id6791036053)

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

**In-app purchases:** none


## Frequently asked questions

### Is FDS Altis free?

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

### Is Waft free?

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

### Do FDS Altis or Waft have ads?

Neither FDS Altis nor Waft shows ads.

### Which is updated more often, FDS Altis or Waft?

FDS Altis ships an update every 3 weeks, and Waft every 2 months. Most recently, FDS Altis was updated on October 19, 2026 and Waft on October 19, 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.*