# ButterDocs vs MindCastle

The clearest difference is in-app purchases: ButterDocs at none against MindCastle's 4. ButterDocs also leads on iOS requirement (16.4 vs 26.0). MindCastle's advantage is update cadence (every 3 weeks vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. MindCastle sells 4 in-app purchases, starting at $1.29 per month. ButterDocs asks for nothing beyond the download.

ButterDocs ships an update every 3 months, MindCastle every 3 weeks. The most recent releases landed on October 24, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | ButterDocs | MindCastle |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (3 ratings)](https://appshunter.io/ios/app/butterdocs/id6448757725/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Ad-supported | — |
| Size | 64 MB | 4 MB |
| Requires iOS | **16.4** | 26.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Arc Studio Labs, Inc.](https://appshunter.io/developer/1656256390) | [Code Maxima](https://appshunter.io/developer/1737735058) |

## What reviewers say

### ButterDocs

[App page](https://appshunter.io/ios/app/butterdocs/id6448757725)

This word processor helps you develop ideas, structure your work, and write without distraction. Collaborate seamlessly with others, with or without AI assistance, for ambitious writing projects.

**Highlights:** Idea development, Work structuring, Distraction-free writing, Frictionless collaboration, AI assistance option

**In-app purchases:** none


### MindCastle

[App page](https://appshunter.io/ios/app/mindcastle/id6758439688)

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $1.29 | per month |
| Annual Subscription | $10.99 | per year |
| Reset Password | $0.99 | one-time |
| Save Password | $0.99 | one-time |


## Frequently asked questions

### Is ButterDocs free?

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

### Is MindCastle free?

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

### Do ButterDocs or MindCastle have ads?

Neither ButterDocs nor MindCastle shows ads.

### Which is updated more often, ButterDocs or MindCastle?

ButterDocs ships an update every 3 months, and MindCastle every 3 weeks. Most recently, ButterDocs was updated on October 24, 2026 and MindCastle on October 5, 2026.

---

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