# NegaWATT vs Concretize

The clearest difference is in-app purchases: NegaWATT at none against Concretize's 1. Concretize's advantage is update cadence (every 4 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Concretize sells 1 in-app purchase, starting at $199.99 per 3 months. NegaWATT asks for nothing beyond the download.

NegaWATT ships an update every 2 weeks, Concretize every 4 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | NegaWATT | Concretize |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Size | 160 MB | 15 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Albatroz Digital, Lda.](https://appshunter.io/developer/1387867940) | [Silhueta Magnifica Unipessoal LDA](https://appshunter.io/developer/1822852516) |

## What reviewers say

### NegaWATT

[App page](https://appshunter.io/ios/app/negawatt/id6467116795)

**In-app purchases:** none


### Concretize

[App page](https://appshunter.io/ios/app/concretize/id6758898886)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Concretize Trimestral | $199.99 | per 3 months |


## Frequently asked questions

### Is NegaWATT free?

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

### Is Concretize free?

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

### Do NegaWATT or Concretize have ads?

Neither NegaWATT nor Concretize shows ads.

### Which is updated more often, NegaWATT or Concretize?

NegaWATT ships an update every 2 weeks, and Concretize every 4 days. Most recently, NegaWATT was updated on November 3, 2026 and Concretize on October 31, 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.*