# Tierzero Voice vs HydroCalc Basic

The clearest difference is in-app purchases: Tierzero Voice at none against HydroCalc Basic's 1. HydroCalc Basic's advantage is update cadence (every 11 days vs every 12 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. HydroCalc Basic sells 1 one-off in-app purchase. Tierzero Voice asks for nothing beyond the download.

Tierzero Voice ships an update every 12 months, HydroCalc Basic every 11 days. The most recent releases landed on October 3, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Tierzero Voice | HydroCalc Basic |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (7 ratings)](https://appshunter.io/ios/app/tierzero-voice/id1253650880/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 11 days** |
| Monetization | Free | — |
| Size | 106 MB | 35 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tierzero](https://appshunter.io/developer/890617304) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### Tierzero Voice

[App page](https://appshunter.io/ios/app/tierzero-voice/id1253650880)

This app provides a unified communications solution, extending business phone features to mobile devices. It allows users to maintain a consistent identity across devices, manage calls, contacts, and voicemail from a single interface.

**Highlights:** Unified Communications solution, Maintain same identity across devices, Seamless call transition, Contact management, Voicemail access, Call history, Answering rules and presence management

**Features:** macOS Compatibility, Siri integration

**In-app purchases:** none


### HydroCalc Basic

[App page](https://appshunter.io/ios/app/hydrocalc-basic/id6752577110)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium - Flow Units & Ad-Free | $1.99 | one-time |


## Frequently asked questions

### Is Tierzero Voice free?

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

### Is HydroCalc Basic free?

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

### Do Tierzero Voice or HydroCalc Basic have ads?

Neither Tierzero Voice nor HydroCalc Basic shows ads.

### Which is updated more often, Tierzero Voice or HydroCalc Basic?

Tierzero Voice ships an update every 12 months, and HydroCalc Basic every 11 days. Most recently, Tierzero Voice was updated on October 3, 2026 and HydroCalc Basic on October 4, 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.*