# SkyMarks vs Lumo AI by Proton

The clearest difference is rating: SkyMarks at 5.0 against Lumo AI by Proton's 3.8. SkyMarks also leads on in-app purchases (none vs 2) and update cadence (every 5 days vs every 11 days). Lumo AI by Proton's advantage is ratings volume (560 vs 2). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Lumo AI by Proton sells 2 in-app purchases, starting at $12.99 per month. SkyMarks asks for nothing beyond the download.

SkyMarks holds the better App Store score, 5.0 against 3.8. That said, the two scores are not equally well evidenced: Lumo AI by Proton has 560 ratings behind it against 2, so its average is the more settled of the two.

SkyMarks ships an update every 5 days, Lumo AI by Proton every 11 days. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | SkyMarks | Lumo AI by Proton |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/skymarks/id6739005862/reviews)** | [3.8 (560 ratings)](https://appshunter.io/ios/app/lumo-ai-by-proton/id6746714949/reviews) |
| Number of ratings | 2 | **560** |
| Positive reviews | — | 45.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 11 days |
| Monetization | **Free** | Free with in-app purchases |
| Size | 13 MB | 103 MB |
| Requires iOS | 17.6 | 17.6 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Old Jewel Software](https://appshunter.io/developer/284830318) | [Proton AG](https://appshunter.io/developer/979659484) |

## What reviewers say

### SkyMarks

[App page](https://appshunter.io/ios/app/skymarks/id6739005862)

This app helps you save and organize posts from the Bluesky social media platform. It allows you to bookmark content from your browser and access it later across all your Apple devices. Features include searching by text, author, or image content, and organizing bookmarks with tags.

**Highlights:** Bookmark Bluesky posts, Cross-device synchronization, Search by text, author, or image, Tagging and filtering, Organize bookmarked content

**In-app purchases:** none


### Lumo AI by Proton

[App page](https://appshunter.io/ios/app/lumo-ai-by-proton/id6746714949)

This AI assistant prioritizes your privacy, offering help with productivity, curiosity, and staying informed. Developed by the team behind trusted encrypted services, it ensures your data remains secure.

**Highlights:** Privacy-first AI assistant, Boost productivity, Satisfy curiosity, Stay informed, Secure data handling

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lumo Plus (1 month) | $12.99 | per month |
| Lumo Plus (12 months) | $119.99 | per year |

**What reviewers like**

- 👍 Sophisticated knowledge base
- 🚀 Rapid evolution with quality
- 💡 Potential for vision-enabled model

**What reviewers complain about**

- 🐛 Inability to answer basic questions
- 🔒 Privacy concerns with data processing
- 🐛 Inconsistent responses
- 🐛 Frequent sign-outs
- 🐛 Dark mode issues

**Reported bugs**

- Slow sign-in page
- Lack of real-time data access

**Requested features**

- Dynamic Type support for adjustable font size
- Secure access to Proton Drive files
- Ghost mode to ensure no chat history is saved
- Intuitive history clearing option
- App mode


## Frequently asked questions

### Is SkyMarks free?

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

### Is Lumo AI by Proton free?

Lumo AI by Proton is free to download, with in-app purchases available.

### Which has better reviews, SkyMarks or Lumo AI by Proton?

SkyMarks is rated higher. SkyMarks averages 5.0 out of 5 from 2 ratings, while Lumo AI by Proton averages 3.8 from 560 ratings.

### Do SkyMarks or Lumo AI by Proton have ads?

Neither SkyMarks nor Lumo AI by Proton shows ads.

### Which is updated more often, SkyMarks or Lumo AI by Proton?

SkyMarks ships an update every 5 days, and Lumo AI by Proton every 11 days. Most recently, SkyMarks was updated on October 30, 2026 and Lumo AI by Proton on November 5, 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.*