Clockwise vs SLS Exercises
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Clockwise
Easily track time zones for friends, family, and colleagues worldwide. Features dynamic backgrounds, personalized photos, and home-screen widgets for at-a-glance updates. Supports over 200k locations, even offline, and syncs across devices via iCloud.
- Automatic time zone detection
- Time scrubbing for planning
- Dynamic sky backgrounds
- Personalized contact photos
- Home-screen widgets
- Daylight Saving Time alerts
- Offline location database
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Tired of calculating time zone differences? Meet Clockwise, the ultimate app for tracking the time of friends, family, and colleagues around the world! • Simple Setup Just enter someone’s name (or select from your contacts), choose their location, and we’ll automatically detect their time zone! • Time Scrubbing Easily shift the time forwards or backwards to plan and coordinate across time zones. • Dynamic Sky Backgrounds Watch the sky come to life with beautiful colors that change in real-time, reflecting the actual sunrise and sunset of each person’s location. • Personalized Photos Add a personal touch by uploading photos of your loved ones. You can scale and crop images to get the perfect fit! • Widgets Stay connected at a glance with home-screen widgets that display the local time of your friends and family without even opening the app! • Daylight Saving Time Never miss a time change again! Stay informed of upcoming daylight saving time changes around the world. • Contact Linking Import your contacts and call or text them directly from the app. Getting in touch with your friends and family abroad has never been easier! • Clock Customization Select from a variety of clock display options, including both analog and 24-hour formats. • Extensive Location Database Choose from over 200k locations worldwide, even offline. Whether it’s a big city or a small town, we’ve got you covered. • iCloud Sync Sync your contacts and their time zones across all your devices via iCloud. Clockwise is available on both iPhone and iPad.
SLS Exercises
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Speech Level Singing Exercises is a voice training tool for singers with various vocal exercises. It has below exercises that are commonly used in Speech Level Singing. - Five Tone Scale - Descending Arpeggio - Descending Octave Repeat - Octave Repeat - Octave More Repeat - Octave Broken - One Half Scale - One Half Scale With Gallop - One Half Scale in Triplets The exercises are grouped by vocal bridges; - Female First Bridge A4 Bb4 B4 C5 C#5 - Female Second Bridge E5 F5 F#5 - Female Full Range - Male First Bridge E4 F4 F#4 - Male Second Bridge A4 Bb4 B4 C5 C#5 - Male Full Range The exercises for the bridges are around the specific bridge areas. In full range sections the exercises cover F3 to F6 for female voices and E2 to F5 for male voices. Exercise ranges can be adjusted within the range of the current bridge. All exercises can be played at any tempo between 40 and 270 (for fast riffs and runs) bpm. Exercises can be bookmarked for quicker reference. The playing note of the scale is shown as text and bridge notes are colored. Colored bridge notes can be turned on and off in the settings.
Screenshots
Verdict
The clearest difference is price: Clockwise at Free against SLS Exercises's $4.99. Clockwise also leads on update cadence (every 6 weeks vs every 6 months). On ads, in-app purchases, device support and iOS requirement 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
Clockwise is free to download; SLS Exercises costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Clockwise ships an update every 6 weeks, SLS Exercises every 6 months. The most recent releases landed on October 8, 2026 and September 29, 2026 respectively.
| Parameter | Clockwise | SLS Exercises |
|---|---|---|
| Price | Free — better | $4.99 |
| Rating | 4.6 (8 ratings) — better | — |
| Positive reviews | 92.9% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 6 weeks — better | Every 6 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.1 | 16 — better |
| Further details — not scored | ||
| Size | 35 MB | 3 MB |
| Age rating | 4+ | 9+ |
| Developer | Brittany Petrova | Altug Basaran |
In-app purchases
Clockwise
No in-app purchases
SLS Exercises
No in-app purchases









