# CSI vs Sign Documents

The clearest difference is in-app purchases: CSI at none against Sign Documents's 5. CSI also leads on review sentiment (27% vs 0%). Sign Documents's advantage is update cadence (weekly vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Sign Documents sells 5 in-app purchases, starting at $4.99 per 7 days. CSI asks for nothing beyond the download.

CSI ships an update monthly, Sign Documents weekly. The most recent releases landed on October 4, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | CSI | Sign Documents |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (152 ratings)](https://appshunter.io/ios/app/sign-documents-esign-pdf/id6502787198/reviews)** |
| Number of ratings | — | **152** |
| Positive reviews | **26.9% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 16 MB | 33 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [MVM Ingenieria de Software S.A.S](https://appshunter.io/developer/1494519769) | [Julia Kucharska](https://appshunter.io/developer/1747807368) |

## What reviewers say

### CSI

[App page](https://appshunter.io/ios/app/csi/id1494519770)

This application is designed to collect information through surveys. It helps in segmenting consumers by gathering valuable data.

**Highlights:** Collect survey information, Consumer segmentation, Data gathering

**Features:** macOS Compatibility

**In-app purchases:** none


### Sign Documents

[App page](https://appshunter.io/ios/app/sign-documents-esign-pdf/id6502787198)

Easily sign and manage your documents with a built-in scanner. Digitize paper, add signatures and stamps, and share your finalized files. Supports various document types for a streamlined workflow.

**Highlights:** Add digital signatures, Insert stamps, Scan documents, Create documents from photos, Sign PDF, DOC, XLS, Share and print documents

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly PRO | $4.99 | per 7 days |
| Weekly PRO Subscription | $4.99 | per 7 days |
| Weekly Premium | $9.99 | per 7 days |
| Annual PRO | $29.99 | per year |
| Annual Premium | $49.99 | per year |


## Frequently asked questions

### Is CSI free?

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

### Is Sign Documents free?

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

### Do CSI or Sign Documents have ads?

Neither CSI nor Sign Documents shows ads.

### Which is updated more often, CSI or Sign Documents?

CSI ships an update monthly, and Sign Documents weekly. Most recently, CSI was updated on October 4, 2026 and Sign Documents on October 12, 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.*