# Span Calc vs ChargeRight

The clearest difference is rating: ChargeRight at 5.0 against Span Calc's 3.0. Span Calc's advantage is in-app purchases (none vs 1) and ratings volume (16 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ChargeRight sells 1 one-off in-app purchase. Span Calc asks for nothing beyond the download.

ChargeRight holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: Span Calc has 16 ratings behind it against 1, so its average is the more settled of the two.

Span Calc ships an update every 10 days, ChargeRight every 3 weeks. The most recent releases landed on October 23, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Span Calc | ChargeRight |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (16 ratings)](https://appshunter.io/ios/app/span-calc/id380481343/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/chargeright/id6755695416/reviews)** |
| Number of ratings | **16** | 1 |
| Positive reviews | 29.6% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 3 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 168 MB | 8 MB |
| Requires iOS | **14.2** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [American Wood Council](https://appshunter.io/developer/380481346) | [JASON LLOYD WALLS](https://appshunter.io/developer/1855640312) |

## What reviewers say

### Span Calc

[App page](https://appshunter.io/ios/app/span-calc/id380481343)

Calculate maximum horizontal spans for wood joists and rafters using various lumber species and grades. Compares multiple options for common loading conditions based on NDS® standards.

**Highlights:** Calculates joist and rafter spans, Supports all softwood and hardwood lumber, Uses 2021 NDS® for Wood Construction, Compares multiple species and grades, Handles common loading conditions

**Features:** macOS Compatibility

**In-app purchases:** none


### ChargeRight

[App page](https://appshunter.io/ios/app/chargeright/id6755695416)

Determine if your home's electrical panel can support an EV charger with a professional load calculation. Get a clear report based on NEC code, saving you money on unnecessary upgrades.

**Highlights:** EV charger sizing calculator, NEC 220.82 load calculation, AI-powered panel photo analysis, Electrician call script, Shareable assessment report, Homeowner-focused guidance

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EV Panel Assessment | $16.99 | one-time |


## Frequently asked questions

### Is Span Calc free?

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

### Is ChargeRight free?

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

### Which has better reviews, Span Calc or ChargeRight?

ChargeRight is rated higher. Span Calc averages 3.0 out of 5 from 16 ratings, while ChargeRight averages 5.0 from 1 ratings.

### Do Span Calc or ChargeRight have ads?

Neither Span Calc nor ChargeRight shows ads.

### Which is updated more often, Span Calc or ChargeRight?

Span Calc ships an update every 10 days, and ChargeRight every 3 weeks. Most recently, Span Calc was updated on October 23, 2026 and ChargeRight on October 11, 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.*