# FormaMENTIS vs Cobalt

The clearest difference is in-app purchases: FormaMENTIS at none against Cobalt's 13. Cobalt's advantage is update cadence (weekly vs every 18 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Cobalt sells 13 in-app purchases, starting at $2.99 per month. FormaMENTIS asks for nothing beyond the download.

FormaMENTIS ships an update every 18 months, Cobalt weekly. The most recent releases landed on October 25, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | FormaMENTIS | Cobalt |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 18 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 127 MB | 132 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [FormaMENTIS](https://appshunter.io/developer/1803471572) | [Theo Rousseau](https://appshunter.io/developer/1814683681) |

## What reviewers say

### FormaMENTIS

[App page](https://appshunter.io/ios/app/formamentis/id6743567720)

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

**In-app purchases:** none


### Cobalt

[App page](https://appshunter.io/ios/app/cobalt-book-summaries/id6746136038)

This app transforms global bestsellers into concise 5, 10, or 15-minute summaries. It uses AI to customize summaries based on your preferences, offering actionable, scientific, or key takeaway formats. Access an elite library of over 300 titles across business, psychology, and biographies, with offline reading capabilities.

**Highlights:** Custom AI summaries, Actionable, Scientific, Key Takeaways formats, Elite library of 300+ titles, Business, Psychology, Biography categories, Offline reading mode, Reduced eye strain interface

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

**In-app purchases (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Abonnement Mensuel (-40%) | $2.99 | per month |
| Weekly Premium subscription. | $3.99 | per 7 days |
| Cobalt Abonnement Mensuel | $4.99 | per month |
| Abonnement Annuel (-40%) | $29.99 | per year |
| Cobalt Abonnement Annuel | $49.99 | per year |
| Influence & Communication | $3.99 | one-time |
| Parcours Vitalité & Santé | $3.99 | one-time |
| Moment Présent | $3.99 | one-time |
| Sport & Performance | $3.99 | one-time |
| Mindset & Psychologie | $3.99 | one-time |
| Entrepreneuriat & Business | $3.99 | one-time |
| Pack Complet - Tous Parcours | $22.99 | one-time |
| Cobalt Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is FormaMENTIS free?

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

### Is Cobalt free?

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

### Do FormaMENTIS or Cobalt have ads?

Neither FormaMENTIS nor Cobalt shows ads.

### Which is updated more often, FormaMENTIS or Cobalt?

FormaMENTIS ships an update every 18 months, and Cobalt weekly. Most recently, FormaMENTIS was updated on October 25, 2026 and Cobalt on October 8, 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.*