# VcfLookup vs Cognize

The clearest difference is in-app purchases: VcfLookup at none against Cognize's 2. VcfLookup also leads on iOS requirement (11.1 vs 15.0). Cognize's advantage is update cadence (weekly vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Cognize sells 2 in-app purchases, starting at $2.99 per month. VcfLookup asks for nothing beyond the download.

VcfLookup ships an update every 3 weeks, Cognize weekly. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | VcfLookup | Cognize |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/vcflookup/id1319259850/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Free | — |
| Size | 9 MB | 110 MB |
| Requires iOS | **11.1** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kah Seng Teo](https://appshunter.io/developer/1319259849) | [Andrea Tesoro](https://appshunter.io/developer/1799709221) |

## What reviewers say

### VcfLookup

[App page](https://appshunter.io/ios/app/vcflookup/id1319259850)

This app provides a quick way to find the Volume Correction Factor (VCF) for marine fuel oil calculations. It references ISO 8217 Specifications, commonly used for marine fuel bunkers on ships globally.

**Highlights:** Volume Correction Factor calculation, Marine fuel oil calculations, ISO 8217 Specifications reference, Handy tool for shipboard use

**Features:** macOS Compatibility

**In-app purchases:** none


### Cognize

[App page](https://appshunter.io/ios/app/cognize-habit-tracker-and-focus/id6742746066)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan — $3.99 per month | $2.99 | per month |
| Yearly Plan — $24.99 per year | $34.99 | per year |


## Frequently asked questions

### Is VcfLookup free?

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

### Is Cognize free?

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

### Do VcfLookup or Cognize have ads?

Neither VcfLookup nor Cognize shows ads.

### Which is updated more often, VcfLookup or Cognize?

VcfLookup ships an update every 3 weeks, and Cognize weekly. Most recently, VcfLookup was updated on October 5, 2026 and Cognize on October 7, 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.*