# Constellation Survey vs Batch PDF Compressor SquashPDF

The clearest difference is in-app purchases: Constellation Survey at none against Batch PDF Compressor SquashPDF's 3. Constellation Survey also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.6). Batch PDF Compressor SquashPDF's advantage is update cadence (every 4 weeks vs every 6 months). On price and ads there is nothing between them.

Both are free to download. Batch PDF Compressor SquashPDF sells 3 in-app purchases, starting at $3.99 per month. Constellation Survey asks for nothing beyond the download.

Constellation Survey ships an update every 6 months, Batch PDF Compressor SquashPDF every 4 weeks. The most recent releases landed on October 5, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Constellation Survey | Batch PDF Compressor SquashPDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.5 (2 ratings)](https://appshunter.io/ios/app/batch-pdf-compressor-squashpdf/id6747497350/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 75.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 4 weeks** |
| Monetization | — | Freemium |
| Size | 21 MB | 27 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [CONSTELLATION MARINE SERVICES (L.L.C)](https://appshunter.io/developer/1435147894) | [Yash Mandhyan](https://appshunter.io/developer/1856960217) |

## What reviewers say

### Constellation Survey

[App page](https://appshunter.io/ios/app/constellation-survey/id1639057844)

**Features:** macOS Compatibility

**In-app purchases:** none


### Batch PDF Compressor SquashPDF

[App page](https://appshunter.io/ios/app/batch-pdf-compressor-squashpdf/id6747497350)

This tool efficiently reduces PDF file sizes without compromising quality. It allows users to select a target file size and offers batch compression for multiple documents. A preview feature helps verify quality before saving.

**Highlights:** Compress single or multiple PDFs, Select target file size, Batch compression, Side-by-side quality preview, Local history of compressions

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $3.99 | per month |
| Weekly Subscription | $4.99 | per 7 days |
| Yearly Subscription | $14.99 | per year |


## Frequently asked questions

### Is Constellation Survey free?

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

### Is Batch PDF Compressor SquashPDF free?

Batch PDF Compressor SquashPDF is free to download, with in-app purchases available.

### Do Constellation Survey or Batch PDF Compressor SquashPDF have ads?

Neither Constellation Survey nor Batch PDF Compressor SquashPDF shows ads.

### Which is updated more often, Constellation Survey or Batch PDF Compressor SquashPDF?

Constellation Survey ships an update every 6 months, and Batch PDF Compressor SquashPDF every 4 weeks. Most recently, Constellation Survey was updated on October 5, 2026 and Batch PDF Compressor SquashPDF 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.*