# Keyline HUB vs Perfumers Vault 2

The clearest difference is in-app purchases: Keyline HUB at none against Perfumers Vault 2's 2. Keyline HUB also leads on iOS requirement (12.0 vs 18.0). Perfumers Vault 2's advantage is update cadence (weekly vs every 6 months). On price, ads and device support there is nothing between them.

Both are free to download. Perfumers Vault 2 sells 2 in-app purchases, starting at $6.99 per month. Keyline HUB asks for nothing beyond the download.

Keyline HUB ships an update every 6 months, Perfumers Vault 2 weekly. The most recent releases landed on October 25, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Keyline HUB | Perfumers Vault 2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (1 ratings)](https://appshunter.io/ios/app/perfumers-vault-2-formula-lab/id6748814424/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | — | Freemium |
| Size | 63 MB | 133 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Keyline S.p.A.](https://appshunter.io/developer/1097748298) | [M24 Media Ltd](https://appshunter.io/developer/1843158778) |

## What reviewers say

### Keyline HUB

[App page](https://appshunter.io/ios/app/keyline-hub/id6511243490)

**Features:** macOS Compatibility

**In-app purchases:** none


### Perfumers Vault 2

[App page](https://appshunter.io/ios/app/perfumers-vault-2-formula-lab/id6748814424)

Design, blend, and track fragrance formulas with an AI assistant. Manage materials, ensure IFRA compliance, and weigh batches. Ideal for perfumers, brands, and students.

**Highlights:** AI-powered formula generation and analysis, IFRA compliance checking and reporting, Material database management, Batch weighing and tracking, Formula scaling and comparison, Import/export of formulas and materials, Biometric security and data hiding

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $6.99 | per month |
| Yearly | $59.99 | per year |


## Frequently asked questions

### Is Keyline HUB free?

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

### Is Perfumers Vault 2 free?

Perfumers Vault 2 is free to download, with in-app purchases available.

### Do Keyline HUB or Perfumers Vault 2 have ads?

Neither Keyline HUB nor Perfumers Vault 2 shows ads.

### Which is updated more often, Keyline HUB or Perfumers Vault 2?

Keyline HUB ships an update every 6 months, and Perfumers Vault 2 weekly. Most recently, Keyline HUB was updated on October 25, 2026 and Perfumers Vault 2 on October 30, 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.*