# Chat PDF Summary vs Sigmy

The clearest difference is update cadence: Sigmy at every 2 weeks against Chat PDF Summary's every 8 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Chat PDF Summary sells 6 in-app purchases, starting at $5.99 per 7 days and Sigmy sells 3 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Chat PDF Summary ships an update every 8 months, Sigmy every 2 weeks. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Chat PDF Summary | Sigmy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 weeks** |
| Size | 9 MB | 3.2 GB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jose Sapon](https://appshunter.io/developer/1833571607) | [SIGMY GROUP PTY LTD](https://appshunter.io/developer/1894404124) |

## What reviewers say

### Chat PDF Summary

[App page](https://appshunter.io/ios/app/chat-pdf-summary-ai-summarize/id6758478401)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Weekly | $5.99 | per 7 days |
| Plus Yearly | $49.99 | per year |
| Premium Version | $2.99 | one-time |
| Small Credits Pack | $4.99 | one-time |
| Medium Credits Pack | $6.99 | one-time |
| Large Credits Pack | $8.99 | one-time |


### Sigmy

[App page](https://appshunter.io/ios/app/sigmy/id6762498646)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $5.99 | per month |
| Pro Yearly | $39.99 | per year |
| Lifetime Pro | $79.99 | one-time |


## Frequently asked questions

### Is Chat PDF Summary free?

Chat PDF Summary is free to download, with in-app purchases available.

### Is Sigmy free?

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

### Do Chat PDF Summary or Sigmy have ads?

Neither Chat PDF Summary nor Sigmy shows ads.

### Which is updated more often, Chat PDF Summary or Sigmy?

Chat PDF Summary ships an update every 8 months, and Sigmy every 2 weeks. Most recently, Chat PDF Summary was updated on October 26, 2026 and Sigmy on October 28, 2026.

---

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