# Construction Calc vs Tether

The clearest difference is price: Tether at Free against Construction Calc's $7.99. Tether also leads on update cadence (daily vs weekly) and iOS requirement (17.0 vs 26.0). On ads, in-app purchases and device support there is nothing between them.

Tether is free to download; Construction Calc costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Construction Calc ships an update weekly, Tether daily. The most recent releases landed on October 5, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Construction Calc | Tether |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/tether-group-safety/id6771774490/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | **Daily** |
| Monetization | — | Free |
| Size | 27 MB | 15 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Snappy Appz Inc.](https://appshunter.io/developer/375591377) | [Tether Safety LLC](https://appshunter.io/developer/6771774492) |

## What reviewers say

### Construction Calc

[App page](https://appshunter.io/ios/app/construction-calc/id1551464972)

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

**In-app purchases:** none


### Tether

[App page](https://appshunter.io/ios/app/tether-group-safety/id6771774490)

This app creates temporary, location-aware groups for events. Hosts set a geofence and duration, and guests join easily via QR code. It provides a live map with alerts if anyone leaves the zone, and all data is automatically deleted when the event ends.

**Highlights:** Temporary group creation, Instant geofencing, QR code invites, Live group map, Zone alerts, Automatic data deletion, Battery-friendly

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

**In-app purchases:** none


## Frequently asked questions

### Is Construction Calc free?

Construction Calc costs $7.99, with no in-app purchases.

### Is Tether free?

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

### Do Construction Calc or Tether have ads?

Neither Construction Calc nor Tether shows ads.

### Which is updated more often, Construction Calc or Tether?

Construction Calc ships an update weekly, and Tether daily. Most recently, Construction Calc was updated on October 5, 2026 and Tether on October 13, 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.*