# Sparky vs VoltBook

The clearest difference is update cadence: VoltBook at every 4 days against Sparky's fortnightly. VoltBook also leads on iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Sparky sells 3 in-app purchases, starting at $3.99 per 7 days and VoltBook sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Sparky ships an update fortnightly, VoltBook every 4 days. The most recent releases landed on October 12, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Sparky | VoltBook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/voltbook/id6801197459/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 17 MB | 60 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [RAPHAEL MOMANYI](https://appshunter.io/developer/1884462424) | [Edward Anthony Whitfield](https://appshunter.io/developer/1836823655) |

## What reviewers say

### Sparky

[App page](https://appshunter.io/ios/app/sparky-electrical-calculators/id6761793929)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Oasic Pro Weekly | $3.99 | per 7 days |
| Oasic Pro Monthly | $9.99 | per month |
| Sparky Pro Annual | $79.99 | per year |


### VoltBook

[App page](https://appshunter.io/ios/app/voltbook/id6801197459)

This app provides electricians with a comprehensive digital toolbox, featuring numerous electrical calculators, searchable code references, and job documentation tools. It offers offline functionality for all calculators and tables, with AI assistance for calculations and field notes.

**Highlights:** 75+ electrical calculators, Searchable NEC code references (2020, 2023, 2026), Offline functionality, AI Assistant for calculations and notes, Nameplate Scanner for equipment data, Job documentation and material lists (Pro)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $4.99 | per month |
| Pro Annual | $39.99 | per year |


## Frequently asked questions

### Is Sparky free?

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

### Is VoltBook free?

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

### Do Sparky or VoltBook have ads?

Neither Sparky nor VoltBook shows ads.

### Which is updated more often, Sparky or VoltBook?

Sparky ships an update fortnightly, and VoltBook every 4 days. Most recently, Sparky was updated on October 12, 2026 and VoltBook on October 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.*