PDF Slim vs UnderLimit
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PDF Slim
Reduce the size of your PDF files with adjustable quality settings. Save or share compressed documents directly from the application. Access detailed information about each PDF.
- Compress PDF files
- Adjustable quality levels
- Save compressed PDFs
- Share instantly
- View PDF details
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A smart compression app that quickly and easily reduces PDF file size! • Every Feature, No Payment Use every feature right away — no payment required. • Your Choice of Compression Quality Choose from three quality levels — Low, Medium, and High — to control how much your PDFs are compressed. The lower the quality, the smaller the file. • Detailed PDF Information Check key details at a glance, including file name, page count, file size, and creation date. • Separate Save & Instant Sharing Your original PDF stays untouched — the compressed copy is saved separately and can be shared instantly from the app.
UnderLimit
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Make your files fit the limit. UnderLimit helps you reduce photos and PDFs to the file size you actually need. Choose your target size, and UnderLimit handles the compression while preserving the best quality possible. PERFECT FOR FILE SIZE LIMITS Need a photo under 1 MB? A PDF under 5 MB? An attachment small enough to upload or send? Set the target size and let UnderLimit do the work. PHOTO COMPRESSION • Compress photos to a target file size • Reduce image size in KB or MB • Keep the best quality possible • Quickly prepare images for uploads, forms, email, and sharing PDF COMPRESSION • Reduce PDF file size • Choose the maximum size you need • Prepare PDFs for upload limits and attachments • Simple, fast workflow SMART RECOMMENDATIONS Not sure which target size to choose? UnderLimit can help you select an appropriate size for your file. PRIVATE BY DESIGN Your files are processed directly on your device. Your photos and PDFs don't need to be uploaded to a remote server for compression. SIMPLE PRICING Start using UnderLimit for free. If you need more, unlock UnderLimit Unlimited with a one-time purchase. No subscription. No ads. No account required. UNDERLIMIT IS USEFUL FOR • Online forms and portals • Email attachments • Applications and document submissions • Websites with maximum upload sizes • Reducing photos before sharing • Compressing PDFs for size-restricted uploads Stop guessing compression levels. Choose the size you need and make your file fit the limit.
Screenshots
Verdict
The clearest difference is in-app purchases: PDF Slim at none against UnderLimit's 1. PDF Slim also leads on iOS requirement (15.0 vs 17.0). UnderLimit's advantage is update cadence (every 2 days vs weekly). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. UnderLimit sells 1 one-off in-app purchase. PDF Slim asks for nothing beyond the download.
PDF Slim ships an update weekly, UnderLimit every 2 days. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.
| Parameter | PDF Slim | UnderLimit |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Weekly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 4 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | MBG Studio | ALESSANDRO VINCENZO DEL BALZO |
In-app purchases
PDF Slim
No in-app purchases
UnderLimit
- UnderLimit Unlimited$2.99









