# I/O Frog vs Lucid Mind

The clearest difference is in-app purchases: I/O Frog at none against Lucid Mind's 2. Lucid Mind's advantage is iOS requirement (15.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Lucid Mind sells 2 in-app purchases, starting at $12.99 per month. I/O Frog asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 months. Both last shipped on November 11, 2026.

## The numbers

| Metric | I/O Frog | Lucid Mind |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (4 ratings)](https://appshunter.io/ios/app/lucid-mind-brainstorm-ideas/id1603326488/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | — | Subscription |
| Size | 126 MB | 29 MB |
| Requires iOS | 18.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sigfrog s.r.o.](https://appshunter.io/developer/531682348) | [Kaan Yildiz](https://appshunter.io/developer/1473960483) |

## What reviewers say

### I/O Frog

[App page](https://appshunter.io/ios/app/io-frog/id1473247008)

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

**In-app purchases:** none


### Lucid Mind

[App page](https://appshunter.io/ios/app/lucid-mind-brainstorm-ideas/id1603326488)

This app provides a peaceful digital space for organizing thoughts, storing ideas, and receiving insights from others. It offers a calming interface designed for night use, allowing users to express themselves freely and anonymously.

**Highlights:** Organize thoughts and ideas, Anonymous idea sharing, Receive insights from competent users, Peaceful night-time interface, Thought visualization as stars, Mind area for concept mapping

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Night Thought Monthly | $12.99 | per month |
| Night Thought Yearly | $59.99 | per year |


## Frequently asked questions

### Is I/O Frog free?

I/O Frog is free to download, with no in-app purchases.

### Is Lucid Mind free?

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

### Do I/O Frog or Lucid Mind have ads?

Neither I/O Frog nor Lucid Mind shows ads.

### Which is updated more often, I/O Frog or Lucid Mind?

I/O Frog ships an update every 2 months, and Lucid Mind every 2 months. Most recently, I/O Frog was updated on November 11, 2026 and Lucid Mind on November 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*