# VoltDo vs NonZero

The clearest difference is in-app purchases: NonZero at none against VoltDo's 2. NonZero also leads on update cadence (every 5 days vs every 5 weeks) and iOS requirement (17.6 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. VoltDo sells 2 in-app purchases, starting at $0.99 per month. NonZero asks for nothing beyond the download.

VoltDo ships an update every 5 weeks, NonZero every 5 days. The most recent releases landed on October 12, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | VoltDo | NonZero |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/voltdo-energy-to-do-list/id6757859325/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 5 days** |
| Monetization | Freemium | — |
| Size | 15 MB | 3 MB |
| Requires iOS | 26.0 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Johanna Hoppe](https://appshunter.io/developer/1869099620) | [Lewis Lee](https://appshunter.io/developer/1878587705) |

## What reviewers say

### VoltDo

[App page](https://appshunter.io/ios/app/voltdo-energy-to-do-list/id6757859325)

This app helps you manage your tasks by considering your personal energy levels. It filters tasks by effort and warns you against overcommitting to prevent burnout. Focus on what you can handle now and find your productive flow.

**Highlights:** Filter tasks by energy effort (Light, Medium, Heavy), Focus Mode to hide overwhelming tasks, Anti-burnout warnings for overcommitment, Smart widgets for home screen task visibility, Personalized energy management

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VoltDo Pro Monthly | $0.99 | per month |
| VoltDo Pro Yearly | $9.99 | per year |


### NonZero

[App page](https://appshunter.io/ios/app/nonzero/id6759438563)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is VoltDo free?

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

### Is NonZero free?

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

### Do VoltDo or NonZero have ads?

Neither VoltDo nor NonZero shows ads.

### Which is updated more often, VoltDo or NonZero?

VoltDo ships an update every 5 weeks, and NonZero every 5 days. Most recently, VoltDo was updated on October 12, 2026 and NonZero on October 25, 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.*