# Braintrust vs Celestial Sleep

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

Both are free to download. Braintrust sells 2 in-app purchases, starting at $9.99 per month and Celestial Sleep sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Braintrust ships an update every 2 weeks, Celestial Sleep fortnightly. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Braintrust | Celestial Sleep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (10 ratings)](https://appshunter.io/ios/app/braintrust-memory-companion/id6476418361/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 42 MB | 32 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Blank Slate Technologies](https://appshunter.io/developer/1324776489) | [Celestial, Inc.](https://appshunter.io/developer/1733197371) |

## What reviewers say

### Braintrust

[App page](https://appshunter.io/ios/app/braintrust-memory-companion/id6476418361)

This app uses cognitive science and AI to help users remember important information. It provides daily review questions and tracks progress, aiding those concerned about memory loss or caring for someone who is.

**Highlights:** Daily review questions, Progress tracking, Research-backed methods, Mini-courses on topics, Templates and examples

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription | $9.99 | per month |
| Subscription | $9.99 | per month |


### Celestial Sleep

[App page](https://appshunter.io/ios/app/celestial-sleep/id6478527941)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Guardian (Month) | $0.99 | one-time |
| Guardian (Quarter) | $1.99 | one-time |
| Guardian (Year) | $9.99 | one-time |


## Frequently asked questions

### Is Braintrust free?

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

### Is Celestial Sleep free?

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

### Do Braintrust or Celestial Sleep have ads?

Braintrust shows ads; Celestial Sleep does not.

### Which is updated more often, Braintrust or Celestial Sleep?

Braintrust ships an update every 2 weeks, and Celestial Sleep fortnightly. Most recently, Braintrust was updated on October 24, 2026 and Celestial Sleep on October 27, 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.*