# SAS Flex vs HydroView by Gilkes

The clearest difference is update cadence: HydroView by Gilkes at weekly against SAS Flex's fortnightly. SAS Flex's advantage is iOS requirement (15 vs 17.0). 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.

SAS Flex ships an update fortnightly, HydroView by Gilkes weekly. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | SAS Flex | HydroView by Gilkes |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Free | — |
| Size | 55 MB | 63 MB |
| Requires iOS | **15** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Specialty Answering Service](https://appshunter.io/developer/922095753) | [Gilbert Gilkes and Gordon Ltd](https://appshunter.io/developer/922500434) |

## What reviewers say

### SAS Flex

[App page](https://appshunter.io/ios/app/sas-flex/id1532051532)

Manage your answering service from your phone. Listen to calls, read transcripts, text callers, and update schedules in real time. Improve customer relationships and ensure no calls are missed.

**Highlights:** Listen to call recordings, Read call transcriptions, Text callers directly, Manage on-call schedules, Review call activity, Block unwanted callers, Post operator alerts

**Features:** Apple Wallet, Vision Pro support

**In-app purchases:** none


### HydroView by Gilkes

[App page](https://appshunter.io/ios/app/hydroview-by-gilkes/id6747967120)

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

**In-app purchases:** none


## Frequently asked questions

### Is SAS Flex free?

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

### Is HydroView by Gilkes free?

HydroView by Gilkes is free to download, with no in-app purchases.

### Do SAS Flex or HydroView by Gilkes have ads?

Neither SAS Flex nor HydroView by Gilkes shows ads.

### Which is updated more often, SAS Flex or HydroView by Gilkes?

SAS Flex ships an update fortnightly, and HydroView by Gilkes weekly. Most recently, SAS Flex was updated on November 3, 2026 and HydroView by Gilkes on November 8, 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.*