# Scrible Extension vs SA_agent

The clearest difference is in-app purchases: Scrible Extension at none against SA_agent's 4. SA_agent's advantage is update cadence (every 3 weeks vs every 17 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. SA_agent sells 4 in-app purchases, starting at $4.99 per year. Scrible Extension asks for nothing beyond the download.

Scrible Extension ships an update every 17 months, SA_agent every 3 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Scrible Extension | SA_agent |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/scrible-extension/id1633472220/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 2 MB | 6 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod, Mac | **iPhone, iPad, iPod, Mac, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Scrible, Inc.](https://appshunter.io/developer/1622074512) | [鹏帆 常](https://appshunter.io/developer/1895084625) |

## What reviewers say

### Scrible Extension

[App page](https://appshunter.io/ios/app/scrible-extension/id1633472220)

This browser extension allows users to save, highlight, and comment on web pages, PDFs, and articles. It integrates with a cloud-based research platform to organize and search saved content, offering features like automatic citation capture and bibliography creation for educational users.

**Highlights:** Save webpages, PDFs, and articles instantly, Highlight key passages, Add comments and thoughts, Tag articles for organization, Automatic annotation loading on revisited pages, Full-text search of saved library, Automatic citation capture (Edu Plan)

**Features:** Safari Extension

**In-app purchases:** none


### SA_agent

[App page](https://appshunter.io/ios/app/sa-agent/id6777446364)

**Features:** Safari Extension

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SA_agent Annual | $4.99 | per year |
| SA Agent Credits | $0.99 | one-time |
| SA Agent Credits | $4.99 | one-time |
| SA Agent Credits | $19.99 | one-time |


## Frequently asked questions

### Is Scrible Extension free?

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

### Is SA_agent free?

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

### Do Scrible Extension or SA_agent have ads?

Neither Scrible Extension nor SA_agent shows ads.

### Which is updated more often, Scrible Extension or SA_agent?

Scrible Extension ships an update every 17 months, and SA_agent every 3 weeks. Most recently, Scrible Extension was updated on November 3, 2026 and SA_agent on October 31, 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.*