# Marvin vs UnitBloom

The clearest difference is in-app purchases: UnitBloom at none against Marvin's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Marvin sells 3 in-app purchases, starting at $2.99 per month. UnitBloom asks for nothing beyond the download.

Marvin ships an update fortnightly, UnitBloom weekly. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Marvin | UnitBloom |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/unitbloom/id6759544493/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Free |
| Size | 35 MB | 3 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [龙 陈](https://appshunter.io/developer/1680445870) | [RePrice LLC](https://appshunter.io/developer/1857807938) |

## What reviewers say

### Marvin

[App page](https://appshunter.io/ios/app/marvin-ai-chat-for-watch/id6743322375)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard Membership | $2.99 | per month |
| Pro Membership | $5.99 | per month |
| 50 Messages | $0.99 | one-time |


### UnitBloom

[App page](https://appshunter.io/ios/app/unitbloom/id6759544493)

This app offers fast and accurate unit conversions for everyday calculations. It supports a wide range of units including length, weight, temperature, and data, with a clean and intuitive interface. Designed for simplicity and speed, it's ideal for anyone needing quick conversions.

**Highlights:** Convert length, weight, temperature, area, volume, time, and data, Instant real-time calculation, Supports negative values, Clean gradient design, English and Chinese language support, Lightweight and easy to use

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Marvin free?

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

### Is UnitBloom free?

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

### Do Marvin or UnitBloom have ads?

Neither Marvin nor UnitBloom shows ads.

### Which is updated more often, Marvin or UnitBloom?

Marvin ships an update fortnightly, and UnitBloom weekly. Most recently, Marvin was updated on November 4, 2026 and UnitBloom 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.*