# Sign Docs vs Solution Calculator

The clearest difference is in-app purchases: Solution Calculator at none against Sign Docs's 9. Solution Calculator also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Sign Docs sells 9 in-app purchases, starting at $7.99 per 7 days. Solution Calculator asks for nothing beyond the download.

Sign Docs ships an update every 11 days, Solution Calculator every 6 days. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Sign Docs | Solution Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (72 ratings)](https://appshunter.io/ios/app/sign-docs-ai-sign-and-scanner/id6503045218/reviews)** | — |
| Number of ratings | **72** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 11 days | **Every 6 days** |
| Monetization | Free with in-app purchases | — |
| Size | 153 MB | 2 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Jayshri Pipaliya](https://appshunter.io/developer/1728178841) | [XING WU](https://appshunter.io/developer/1896624836) |

## What reviewers say

### Sign Docs

[App page](https://appshunter.io/ios/app/sign-docs-ai-sign-and-scanner/id6503045218)

Easily sign PDF documents, create e-signatures, and fill forms directly on your mobile device. This app eliminates the need for printers and scanners, allowing you to securely sign contracts, invoices, and other official documents in seconds.

**Highlights:** Sign PDFs instantly, Create reusable digital signatures, Fill and sign PDF forms, Scan documents to PDF, Convert images to PDF, Secure document encryption

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Signature PRO - Weekly Exp | $7.99 | per 7 days |
| Signature PRO - Weekly | $7.99 | per 7 days |
| Signature PRO - Monthly | $14.99 | per month |
| Signature PRO - Monthly Exp | $17.99 | per month |
| Signature PRO - Yearly Offer | $19.99 | per year |
| Signature PRO - Yearly | $44.99 | per year |
| Signature PRO - Yearly Exp | $54.99 | per year |
| Signature PRO - Lifetime | $19.99 | one-time |
| Signature PRO Exp - Lifetime | $19.99 | one-time |


### Solution Calculator

[App page](https://appshunter.io/ios/app/solution-calculator/id6769040029)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sign Docs free?

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

### Is Solution Calculator free?

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

### Do Sign Docs or Solution Calculator have ads?

Sign Docs shows ads; Solution Calculator does not.

### Which is updated more often, Sign Docs or Solution Calculator?

Sign Docs ships an update every 11 days, and Solution Calculator every 6 days. Most recently, Sign Docs was updated on October 24, 2026 and Solution Calculator on October 6, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*