# ESP Partner Go vs iSign

The clearest difference is in-app purchases: ESP Partner Go at none against iSign's 12. ESP Partner Go also leads on ads (none vs shown) and device support (3 vs 1). iSign's advantage is update cadence (every 3 weeks vs every 6 months). On price there is nothing between them.

Both are free to download. iSign sells 12 in-app purchases, starting at $4.99 per 7 days. ESP Partner Go asks for nothing beyond the download.

ESP Partner Go ships an update every 6 months, iSign every 3 weeks. The most recent releases landed on September 21, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | ESP Partner Go | iSign |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.4 (49 ratings)](https://appshunter.io/ios/app/isign-sign-documents/id6748340697/reviews)** |
| Number of ratings | — | **49** |
| Positive reviews | — | 81.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 17 MB | 27 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | +4 |
| Developer | [ESP GLOBAL SERVICES LTD](https://appshunter.io/developer/942906088) | [PRODEKS](https://appshunter.io/developer/1711040618) |

## What reviewers say

### ESP Partner Go

[App page](https://appshunter.io/ios/app/esp-partner-go/id6740903301)

**Features:** macOS Compatibility

**In-app purchases:** none


### iSign

[App page](https://appshunter.io/ios/app/isign-sign-documents/id6748340697)

Effortlessly sign and manage your digital documents with an AI-powered signature generator. This tool allows you to create custom electronic signatures, sign PDFs, fill forms, and add annotations directly from your device for a streamlined workflow.

**Highlights:** AI-generated electronic signatures, Sign and export PDF files, Capture and digitize handwritten signatures, Fill interactive PDF forms, Add custom stamps and annotations, Cross-device accessibility

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium features (Weekly) | $4.99 | per 7 days |
| Premium features (Weekly) | $6.99 | per 7 days |
| Premium features (Weekly) | $6.99 | per 7 days |
| Premium features (Month) | $9.99 | per month |
| Premium features (Month) | $14.99 | per month |
| Premium features (Month) | $14.99 | per month |
| Premium features (Month) | $19.99 | per month |
| Premium features (Annual) | $49.99 | per year |
| Premium Year Access | $69.99 | per year |
| Premium Year Access | $69.99 | per year |
| Lifetime Access | Free | one-time |
| Lifetime Access | $119.99 | one-time |


## Frequently asked questions

### Is ESP Partner Go free?

ESP Partner Go is free to download, with no in-app purchases.

### Is iSign free?

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

### Do ESP Partner Go or iSign have ads?

iSign shows ads; ESP Partner Go does not.

### Which is updated more often, ESP Partner Go or iSign?

ESP Partner Go ships an update every 6 months, and iSign every 3 weeks. Most recently, ESP Partner Go was updated on September 21, 2026 and iSign on September 4, 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.*