Comparison

SlimSpace vs PDF Compress

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

SlimSpace

Free up device storage by reducing the size of photos and videos. This app offers offline compression with advanced algorithms to maintain quality. It supports various file formats and includes tools for cleaning up your photo library.

Highlights
  • Offline compression
  • No watermark or time limits
  • Advanced quality preservation
  • Supports major file formats
  • Customizable compression settings
  • Batch compression
  • Album and screenshot cleaner
Features
Read full description

Running out of storage space? Videos too large to send? Photos too big to share on WeChat or social media? Video & Photo Compressor is here to help! This app is your all-in-one solution for reducing file sizes without sacrificing quality. Whether it's videos, images, or other large files, you can compress them in just a few taps and save valuable storage on your device. 【Key Features】 • No watermark, no time limits • Offline compression — all processing happens locally on your phone. No internet needed, keeping your data secure • Advanced compression algorithms that preserve original quality while minimizing file size • Supports all major formats — MP4, MOV, AVI, MKV, 3GP, FLV, MPG, JPEG, PNG, and more • Customizable settings — choose compression priority: smaller size or better resolution • Preview results before saving • One-tap delete original files to save space instantly • Batch compression — process multiple files at once with ease 【More Space-Saving Tools】 • Album cleaner • Similar photo cleaner • Screenshot manager • Video splitter • File archiving and compression ========================== Compressor Pro Unlimited Subscription ========================== - Join Compressor Pro members, free to use all features, including all video & audio formats, ocr function, in addition, ads will be automatically removed. - Compressor Pro Unlimited subscription is billed monthly or annually at the rate correspnding to the selected plan. In addition, a one-time payment will be offered if needed, which is not one of the subscription plan. - Payment will be charged to Itunes Account at confirmation of purchase. - Subscriptions automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal. - Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. - Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. - Terms of use : https://www.jianshu.com/p/7b3c05310c93 - Privacy policy: https://www.jianshu.com/p/4a71bed09de0

About

PDF Compress

This tool allows you to significantly reduce the size of PDF files, making them easier to share. It offers multiple compression levels and a user-friendly interface for quick and efficient file management. You can also rename and preview files before sharing.

Highlights
  • Compress PDF files to desired size
  • Multiple compression levels
  • User-friendly design
  • Fast and easy-to-use interface
  • Achieve over 90% compression
  • Rename PDF files
  • Preview PDF files
Features
Read full description

With our PDF Compressor - Small PDF Size app, you can compress large PDF files by up to 95%, significantly reducing their size. Simply select the PDF you want to compress and let the app handle the rest. Key features of Compress PDF, Small PDF include: • Compress PDF files to the desired size for easier sharing. • Multiple compression levels to suit your needs. • Sleek, user-friendly design. • Fast and easy-to-use interface. • Achieve compression rates of over 90%. • Easily share compressed PDF files. • Rename PDF file before or after compression • Preview PDF file before sharing, The PDF Compressor - Small PDF Size tool makes it simple to reduce the size of your PDF files, ensuring they are more manageable and easier to share. Some features are pro features within the app purchase plan: Week : 1.99$, Month : 4.99$, year :14.99$ Note: * Each subscription will be automatically renewed unless auto-renew is turned off at least 24 hours before the end of the current payment period. * Your iTunes account will be automatically charged at the same price for renewal within the 24-hour period prior to the end of the current payment period unless you change your subscription preferences in your iTunes Account Settings. * Payment will be charged to iTunes Account at confirmation of purchase. Any unused portion of a free trial period, if offered, will be forfeited when the user purchases a subscription to that publication, where applicable. Terms & Privacy URL https://www.appcreativitylab.com/compress-pdf-privacy-and-terms

Screenshots

SlimSpace4 screens
PDF Compress4 screens

Verdict

The call

The clearest difference is review sentiment: SlimSpace at 67% against PDF Compress's 0%. SlimSpace also leads on rating (4.6 vs 2.0) and update cadence (every 2 weeks vs every 3 months). PDF Compress's advantage is ads (none vs shown). On price, in-app purchases, monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SlimSpace sells 4 in-app purchases, starting at $0.69 per 7 days and PDF Compress sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

SlimSpace holds the better App Store score, 4.6 against 2.0. That said, the two scores are not equally well evidenced: SlimSpace has 998 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 67% of SlimSpace's written reviews are positive against 0% of PDF Compress's.

UpkeepUpdate frequency

SlimSpace ships an update every 2 weeks, PDF Compress every 3 months. The most recent releases landed on October 13, 2026 and September 27, 2026 respectively.

Scorecard5 real differences · 5 level
SlimSpace versus PDF Compress: the parameters behind the verdict, then further details
ParameterSlimSpacePDF Compress
PriceFreeFree
Rating4.6 (998 ratings) — better2.0 (1 ratings)
Positive reviews67.3% of reviews — better0.0% of reviews
Number of ratings998 — better1
Update frequencyEvery 2 weeks — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better16.0
Further details — not scored
Size41 MB6 MB
Age rating4+4+
DeveloperHappyTimes Tech Co., Ltd.Mohamed Oufqir

Customer experience

SlimSpace

All ratings998 ratings
Positive90.5%
Neutral2.3%
Negative7.2%
Written reviews394 reviews
Positive67.3%
Neutral5.3%
Negative27.4%

PDF Compress

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

SlimSpace

Reported bugs

5 issues
  • Videos not resizing properly
  • Compressed photos not saving to album
  • Paid features not working as expected
  • App crashing on launch or during compression
  • Excessive data usage

Requested features

5 requests
  • Batch compression option
  • More compression quality settings
  • Ability to preview compressed files
  • Support for more file types
  • Improved error handling and feedback

PDF Compress

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

SlimSpace

Subscriptions3
  • Upgrade(1 Week)$0.697 Days
  • Upgrade(1 Month)$3.491 Month
  • Compressor Vip(1 Year)3 Days trial$6.491 Year
One-time1
  • Upgrade(Forever)$18.99
3 purchases

PDF Compress

Subscriptions3
  • Week$1.997 Days
  • Month$4.991 Month
  • Year$14.991 Year

Questions

Is SlimSpace free?
SlimSpace is free to download, with in-app purchases available.
Is PDF Compress free?
PDF Compress is free to download, with in-app purchases available.
Which has better reviews, SlimSpace or PDF Compress?
SlimSpace is rated higher. SlimSpace averages 4.6 out of 5 from 998 ratings, while PDF Compress averages 2.0 from 1 ratings.
Do SlimSpace or PDF Compress have ads?
SlimSpace shows ads; PDF Compress does not.
Which is updated more often, SlimSpace or PDF Compress?
SlimSpace ships an update every 2 weeks, and PDF Compress every 3 months. Most recently, SlimSpace was updated on October 13, 2026 and PDF Compress on September 27, 2026.

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