# CableCalc BS7671 vs SAGE® by Armstrong

The clearest difference is price: SAGE® by Armstrong at Free against CableCalc BS7671's $149.99. SAGE® by Armstrong also leads on update cadence (every 2 months vs every 23 months). CableCalc BS7671's advantage is iOS requirement (9.0 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

SAGE® by Armstrong is free to download; CableCalc BS7671 costs $149.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CableCalc BS7671 ships an update every 23 months, SAGE® by Armstrong every 2 months. Both last shipped on November 6, 2026.

## The numbers

| Metric | CableCalc BS7671 | SAGE® by Armstrong |
| --- | --- | --- |
| Price | $149.99 | **Free** |
| Rating | — | **[4.4 (22 ratings)](https://appshunter.io/ios/app/sage-by-armstrong/id1030781134/reviews)** |
| Number of ratings | — | **22** |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 55 MB |
| Requires iOS | **9.0** | 16.6 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Castline Systems](https://appshunter.io/developer/561044559) | [Armstrong International, Inc.](https://appshunter.io/developer/1030781133) |

## What reviewers say

### CableCalc BS7671

[App page](https://appshunter.io/ios/app/cablecalc-bs7671/id665882941)

This application performs comprehensive electrical cable calculations compliant with BS7671:2018(2024) standards. It checks for voltage drop, disconnection time, fault current, and overload data, generating detailed PDF reports. Supports single and three-phase calculations for various circuit types and includes extensive cable databases.

**Highlights:** BS7671:2018(2024) compliant calculations, Voltage drop, disconnection time, fault current checks, Single and three-phase calculations, Radial, ring, and sub main circuits, Detailed PDF report generation, Extensive cable and protective device database, Correction factor application

**In-app purchases:** none


### SAGE® by Armstrong

[App page](https://appshunter.io/ios/app/sage-by-armstrong/id1030781134)

Manage steam traps and digital domestic hot water systems with this native Apple application. Perform surveys offline, connect directly to compatible devices via Bluetooth, and sync data to the cloud when a network is available.

**Highlights:** Steam trap surveys, Digital hot water system management, Offline data collection, Bluetooth (BLE) device communication, Real-time monitoring, Alarm configuration

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CableCalc BS7671 free?

CableCalc BS7671 costs $149.99, with no in-app purchases.

### Is SAGE® by Armstrong free?

SAGE® by Armstrong is free to download, with no in-app purchases.

### Do CableCalc BS7671 or SAGE® by Armstrong have ads?

Neither CableCalc BS7671 nor SAGE® by Armstrong shows ads.

### Which is updated more often, CableCalc BS7671 or SAGE® by Armstrong?

CableCalc BS7671 ships an update every 23 months, and SAGE® by Armstrong every 2 months. Most recently, CableCalc BS7671 was updated on November 6, 2026 and SAGE® by Armstrong on November 6, 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.*