# Percent Error Calculator vs Null Fasting

The clearest difference is device support: Percent Error Calculator at 3 against Null Fasting's 1. Percent Error Calculator also leads on iOS requirement (13.0 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 3, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Percent Error Calculator | Null Fasting |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (2 ratings)](https://appshunter.io/ios/app/null-fasting/id6743633464/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Monetization | — | Free |
| Size | 40 MB | 21 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [STAGE CODING, Travnik](https://appshunter.io/developer/1637068135) | [YMMV](https://appshunter.io/developer/1224453829) |

## What reviewers say

### Percent Error Calculator

[App page](https://appshunter.io/ios/app/percent-error-calculator/id1619680411)

**Features:** macOS Compatibility

**In-app purchases:** none


### Null Fasting

[App page](https://appshunter.io/ios/app/null-fasting/id6743633464)

This app helps you track intermittent fasting with flexible protocols, detailed statistics, and motivational tools. It integrates with health platforms and offers personalized goal setting for a healthier lifestyle.

**Highlights:** Flexible fasting protocols (16:8, OMAD, custom), Intelligent tracking with timers and notifications, Comprehensive statistics and progress analysis, Apple Health integration, Milestone tracking and educational content, Personalized motivation and goal setting, Smart scheduling and reminders

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Percent Error Calculator free?

Percent Error Calculator is free to download, with no in-app purchases.

### Is Null Fasting free?

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

### Do Percent Error Calculator or Null Fasting have ads?

Neither Percent Error Calculator nor Null Fasting shows ads.

### Which is updated more often, Percent Error Calculator or Null Fasting?

Percent Error Calculator ships an update weekly, and Null Fasting weekly. Most recently, Percent Error Calculator was updated on October 3, 2026 and Null Fasting on September 29, 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.*