Comparison

S3 Client vs Kumo Countdown Timer

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

Head to head
About

S3 Client

Access and manage your S3-compatible cloud storage directly from your device's file system. Files are downloaded on demand and synchronized automatically, with support for various S3 services and encryption methods.

Highlights
  • Direct S3 storage access
  • On-demand file downloading
  • Automatic synchronization
  • Support for multiple S3 services
  • System share sheet uploads
  • Pre-signed sharing link generation
  • Shortcuts automation support
Features
Read full description

Access your S3 storage directly from the Files app, Finder, and other applications on iPhone, iPad, and Mac. Developed by the creator of Working Copy, this application provides seamless integration with S3-compatible storage services. Once configured, S3 buckets appear alongside other cloud storage providers, with files available on demand. Files are downloaded as needed and automatically synchronized back to S3 when modified. The app supports a wide range of S3-compatible services, including AWS S3, BackBlaze B2, CloudFlare R2, DigitalOcean Spaces, MinIO, and others. Files and directories can be uploaded through the system share sheet on iOS and the Services menu on macOS. The app remembers preferred upload destinations for different file types, streamlining file management. Pre-signed sharing links can be generated directly from Finder and the Files app, allowing temporary access to files for up to seven days. Support for server-side encryption with customer-provided keys (SSE-C) and client-side AES-GCM encryption compatible with the Amazon S3 Encryption Client. Comprehensive support for Shortcuts automation enables operations such as listing, downloading, uploading, and moving files. The app is free to use with a single server. A Pro Unlock is required for multiple servers, available as a one-time purchase or a monthly subscription, with access shared across iPhone, iPad, and Mac. A one-week free trial allows users to evaluate Pro features before purchase.

About

Kumo Countdown Timer

This app visually displays the remaining time until your next scheduled event, helping you manage your focus and avoid being late. It syncs with your existing calendar and shows live countdowns on your lock screen and device.

Highlights
  • Live countdown display
  • Lock screen widget
  • Dynamic Island integration
  • Calendar sync (iCloud, Google, Outlook)
  • Automatic updates from calendar changes
  • No accounts or subscriptions required
Features
Read full description

An alarm tells you when you're already late. Kumo does the opposite: it shows the time you still have, counting down to your next event before it arrives. Pick events from your existing calendar. Kumo shows a live countdown at the top of your screen and on your lock screen. No math in your head, no surprises once your event arrives. Just a clear amount of focus time sitting in plain sight, so you can settle into what you're doing now with room to breathe. Made for people with time blindness, ADHD, or anyone whose sense of time doesn't run on a clock. How it works: Connect the calendar already on your iPhone Tap one event or several to start their countdowns Watch the time count down on your lock screen and the top of your phone (Dynamic Island) Pick as many events as you like, and Kumo keeps up as your calendar changes: add, move, or cancel something, and your countdowns follow. Works with iCloud, Google, Outlook, and any other calendar in the iOS Calendar app. Your calendar stays yours. Kumo reads your events on your device to show your countdowns. No subscriptions. No accounts.

Screenshots

S3 Client4 screens
Kumo Countdown Timer4 screens

Verdict

The call

The clearest difference is price: S3 Client at Free against Kumo Countdown Timer's $2.99. S3 Client also leads on ratings volume (56 vs 4) and device support (3 vs 1). Kumo Countdown Timer's advantage is in-app purchases (none vs 3) and review sentiment (100% vs 79%). On update cadence and ads 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

S3 Client is free to download; Kumo Countdown Timer costs $2.99 up front. S3 Client sells 3 in-app purchases, starting at $2.99 per month. Kumo Countdown Timer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Kumo Countdown Timer holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: S3 Client has 56 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 79% of S3 Client's written reviews are positive against 100% of Kumo Countdown Timer's.

UpkeepUpdate frequency

S3 Client ships an update every 9 days, Kumo Countdown Timer weekly. The most recent releases landed on October 10, 2026 and October 4, 2026 respectively.

Scorecard8 real differences · 2 level
S3 Client versus Kumo Countdown Timer: the parameters behind the verdict, then further details
ParameterS3 ClientKumo Countdown Timer
PriceFree — better$2.99
Rating4.8 (56 ratings)5.0 (4 ratings) — better
Positive reviews79.1% of reviews100.0% of reviews — better
Number of ratings56 — better4
Update frequencyEvery 9 daysWeekly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, Mac — betteriPhone
Requires iOS18.2 — better26.1
Further details — not scored
Size63 MB2 MB
Age rating4+4+
DeveloperAnders Borum ApSTiny Tools Studio LLC

Customer experience

S3 Client

All ratings56 ratings
Positive94.6%
Neutral1.8%
Negative3.6%
Written reviews86 reviews
Positive79.1%
Neutral10.5%
Negative10.5%

Kumo Countdown Timer

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

S3 Client

Reported bugs

17 issues
  • Files renamed randomly
  • High CPU usage
  • Stopped working in iOS 26
  • Can't set permissions
  • Fails to load S3 buckets properly
Show 12 more
  • Duplicating root folders
  • Folders missing
  • Failing to upload
  • No image/video thumbnails
  • EXIF option unreliable
  • No SSE-C encryption/decryption support
  • Does not support IAM policy roles
  • Short-lived keys needed
  • App locks up Files app
  • Requires reboot
  • Issues with S3 Minio
  • Update issues with older macOS

Requested features

14 requests
  • Support for WebDAV servers
  • Support for Google OAuth for GCS
  • Synchronous feature to backup photos automatically
  • Configurable AWS endpoint for non-.com endpoints
  • Allow import/export of configuration
Show 9 more
  • Show number of files in a directory
  • Option to clear app cache
  • Support for SSE-C encryption/decryption
  • Support for IAM policy roles
  • Support for S3 buckets with short-lived keys
  • Dark mode option
  • Advanced analytics dashboard
  • Duplicate Settings option for iOS
  • Support for public dataset anonymous configuration

Kumo Countdown Timer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

S3 Client

Subscriptions1
  • S3 Files Pro Monthly7 Days trial$2.991 Month
One-time2
  • Lifetime S3 Pro$14.99
  • Lifetime S3 Pro$17.99
None

Kumo Countdown Timer

No in-app purchases

Questions

Is S3 Client free?
S3 Client is free to download, with in-app purchases available.
Is Kumo Countdown Timer free?
Kumo Countdown Timer costs $2.99, with no in-app purchases.
Which has better reviews, S3 Client or Kumo Countdown Timer?
Kumo Countdown Timer is rated higher. S3 Client averages 4.8 out of 5 from 56 ratings, while Kumo Countdown Timer averages 5.0 from 4 ratings.
Do S3 Client or Kumo Countdown Timer have ads?
Neither S3 Client nor Kumo Countdown Timer shows ads.
Which is updated more often, S3 Client or Kumo Countdown Timer?
S3 Client ships an update every 9 days, and Kumo Countdown Timer weekly. Most recently, S3 Client was updated on October 10, 2026 and Kumo Countdown Timer on October 4, 2026.

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