# Chat with PDF vs Lambda

The clearest difference is in-app purchases: Lambda at none against Chat with PDF's 4. Chat with PDF's advantage is update cadence (every 4 days vs every 5 weeks) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Chat with PDF sells 4 in-app purchases, starting at $4.99 per month. Lambda asks for nothing beyond the download.

Chat with PDF ships an update every 4 days, Lambda every 5 weeks. The most recent releases landed on October 25, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Chat with PDF | Lambda |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/lambda-retro-with-friends/id6785801114/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 5 weeks |
| Monetization | — | Free |
| Size | 28 MB | 23 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Fuad Hasanli](https://appshunter.io/developer/1856832329) | [笛 姜](https://appshunter.io/developer/1561507357) |

## What reviewers say

### Chat with PDF

[App page](https://appshunter.io/ios/app/chat-with-pdf-docmind-ai/id6757693350)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $4.99 | per month |
| Pro+ Monthly | $9.99 | per month |
| Pro | $35.99 | per year |
| Pro+ Yearly | $71.99 | per year |


### Lambda

[App page](https://appshunter.io/ios/app/lambda-retro-with-friends/id6785801114)

This application allows users to play supported games with others on the same local network. Create rooms and connect with nearby players for a direct, low-latency multiplayer experience. It functions as a multi-system game emulator.

**Highlights:** LAN multiplayer support, Create game rooms, Connect with nearby players, Low-latency gameplay, Multi-system emulation

**Features:** macOS Compatibility, Family Sharing

**In-app purchases:** none


## Frequently asked questions

### Is Chat with PDF free?

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

### Is Lambda free?

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

### Do Chat with PDF or Lambda have ads?

Neither Chat with PDF nor Lambda shows ads.

### Which is updated more often, Chat with PDF or Lambda?

Chat with PDF ships an update every 4 days, and Lambda every 5 weeks. Most recently, Chat with PDF was updated on October 25, 2026 and Lambda on October 15, 2026.

---

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