# Sidekick vs 2sBrain

The clearest difference is iOS requirement: 2sBrain at 15.5 against Sidekick's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Sidekick sells 6 in-app purchases, starting at $3.99 per 7 days and 2sBrain sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Sidekick ships an update every 11 days, 2sBrain weekly. The most recent releases landed on September 29, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Sidekick | 2sBrain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (8 ratings)](https://appshunter.io/ios/app/sidekick-ai-chat-bot/id6479694651/reviews)** | — |
| Number of ratings | **8** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 11 days | **Weekly** |
| Monetization | Freemium | — |
| Size | 94 MB | 66 MB |
| Requires iOS | 18.0 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [SonderSpot OU](https://appshunter.io/developer/1671574323) | [Nguyen Nhu Vuong](https://appshunter.io/developer/1486864462) |

## What reviewers say

### Sidekick

[App page](https://appshunter.io/ios/app/sidekick-ai-chat-bot/id6479694651)

This AI assistant leverages advanced models like GPT-5.4 and Gemini to provide instant answers, engage in natural conversations, and act as a versatile virtual helper for work, study, and daily tasks. It offers interactive AI characters, voice input, and tools for writing, summarizing documents, and generating images.

**Highlights:** Advanced AI models (GPT-5.4, Gemini), Interactive AI characters, Virtual assistant for tasks, Voice input and speech recognition, AI writing and editing tools, Document summarization and OCR, AI image generation

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $3.99 | per 7 days |
| PRO Weekly Trial | $7.99 | per 7 days |
| PRO Monthly | $19.99 | per month |
| PRO Yearly | $29.99 | per year |
| PRO Yearly | $39.99 | per year |
| PRO Yearly | $59.99 | per year |


### 2sBrain

[App page](https://appshunter.io/ios/app/2sbrainai-pdf-document-reader/id6768344372)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP Monthly | $3.99 | per month |
| VIP Yearly | $19.99 | per year |
| VIP Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Sidekick free?

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

### Is 2sBrain free?

2sBrain is free to download, with in-app purchases available.

### Do Sidekick or 2sBrain have ads?

Neither Sidekick nor 2sBrain shows ads.

### Which is updated more often, Sidekick or 2sBrain?

Sidekick ships an update every 11 days, and 2sBrain weekly. Most recently, Sidekick was updated on September 29, 2026 and 2sBrain on October 8, 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.*