Comparison

Sleek vs Grindcalculator

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

Head to head
About

Sleek

Organize your life with color-coded lists, priorities, and smart reminders. Capture ideas quickly and never forget important tasks with customizable notifications and widgets. Protect your private lists with biometric security.

Highlights
  • Color-coded task lists
  • Priority setting
  • Due dates and reminders
  • Notes and attachments
  • Quick task capture
  • Customizable themes and fonts
  • Biometric list locking
Features
Read full description

## Description Sleek helps you manage tasks with clarity and style. Organize everything into color-coded lists, set priorities, due dates, and reminders - then get notified right on time. GET THINGS DONE • Create lists for work, personal, shopping, anything • Set High, Medium, or Low priority for every task • Pick due dates on a beautiful built-in calendar • Attach notes to tasks for extra context • Quick Tasks: swipe to instantly capture ideas NEVER FORGET • Smart reminders: at time, 15 min, 1 hour, or 1 day before • Repeating reminders: daily, weekly, monthly, or yearly • Home Screen widgets: due count, today's list, and a completion ring • Lock Screen widgets keep your day next to the clock • Complete tasks directly from notifications MAKE IT YOURS • Give every list its own color • Two hand-crafted looks: warm light and deep dark (or follow your system) • Lock private lists with Face ID or Touch ID SLEEK PRO Unlock unlimited lists and tasks, private lists, moving tasks between lists, and an ad-free experience. Choose monthly or yearly. Free users get up to 5 lists with 5 tasks each — plenty to get started. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://kapps.us/privacy-policy

About

Grindcalculator

This tool simplifies knife sharpening by calculating the correct angle, eliminating the need for manual marking. Save custom sharpening angles and grinding wheel dimensions for consistent results across various brands and types of sharpening tools.

Highlights
  • Precise angle calculation
  • Eliminates manual marking
  • Save custom angles
  • Save grinding wheel dimensions
  • Supports all grinder brands
  • Offline functionality
Read full description

The sharpening calculator is the perfect tool for sharpening knives. Especially when sharpening knives, it is important that the correct angle is resharpened. Most manufacturers, such as Tormek, Einhell, Scheppach, Record Power and many others supply an angle gauge specially designed for the machine. It takes a lot of practice to set the machine correctly with the gauge in order to be able to sharpen the correct sharpening angle on the knife or any other sharpening piece. Professionals often mark their phase to adjust the toolbar to the correct height. We developed the sharpening calculator app to make it easier to sharpen or sharpen knives and, above all, to get a consistently good sharpening result. The annoying phase marking is no longer necessary. Just like the complicated application of the angle gauge to the clamped sanding pad and the adjustment of the toolbar. There is almost no limit to the detection of grinders, grinding wheels and grinding pieces. Grinding pieces are, for example, kitchen knives, wood chisels or planer knives. Everything that can be ground with a wet grinding machine. After the app has been installed, the basic dimensions for the top toolbar, the front bar and, if available, the front base must be entered as described in our tutorial. The values can be adjusted at any time if you have measured yourself. The grinding wheels can either be saved or adjusted again for each grinding process. Here it is important that CBN wheels, for example, always have the same diameter, but wet grinding stones lose diameter through use. This value must be adjusted before grinding. The grinding calculator is suitable for probably every grinding machine from all manufacturers. Even individual structures can be used. Many app users have bought various grinding wheels from, for example, grinding junkies. The grinding calculator also works perfectly for this. With some polishing wheels, an angle correction can be stored so that polishing works even better. If you have recurring sharpening pieces such as kitchen knives, it is possible to save them with the respective sharpening angle. This eliminates the need to measure the angle again when resharpening and everything goes much faster. The grinding calculator is now also available for the iPad. All functions can be used. If you allow access to the iCloud, then all entries are synchronized between the devices. This means that all devices, grinding wheels and grinding pieces are synchronized on all devices used such as iPhone and iPad. This process is also the only thing for which the grinding computer needs an internet connection. Otherwise, the app works anytime, anywhere, even without an active internet connection. With family sharing, each user has their own database. It is currently not possible to share your own devices between users. Further features are described on our website https://www.grindcalculator.de. The procedure is described in detail in the operating instructions, which can be found under the URL https://www.grindcalculator.de/tutorials/operation-manual.

Screenshots

Sleek4 screens
Grindcalculator4 screens

Verdict

The call

The clearest difference is price: Sleek at Free against Grindcalculator's $6.99. Sleek also leads on rating (5.0 vs 1.0) and ratings volume (6 vs 1). Grindcalculator's advantage is in-app purchases (none vs 4) and ads (none vs shown). On 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

Sleek is free to download; Grindcalculator costs $6.99 up front. Sleek sells 3 in-app purchases, starting at $1.99 per month. Grindcalculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Sleek holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: Sleek has 6 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Sleek ships an update every 2 months, Grindcalculator every 4 days. Both last shipped on October 24, 2026.

Scorecard8 real differences · 2 level
Sleek versus Grindcalculator: the parameters behind the verdict, then further details
ParameterSleekGrindcalculator
PriceFree — better$6.99
Rating5.0 (6 ratings) — better1.0 (1 ratings)
Positive reviews—84.6% of reviews
Number of ratings6 — better1
Update frequencyEvery 2 monthsEvery 4 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFreemium — betterPaid
DevicesiPhoneiPhone, iPad — better
Requires iOS17.0 — better26.0
Further details — not scored
Size23 MB9 MB
Age rating4+4+
DeveloperKapps LLCRoWo UG

Customer experience

Sleek

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Grindcalculator

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews13 reviews
Positive84.6%
Neutral0.0%
Negative15.4%

In-app purchases

3 purchases

Sleek

Subscriptions2
  • Monthly3 Days trial$1.991 Month
  • Yearly7 Days trial$17.991 Year
One-time1
  • Become a PRO Sleek user2 variants$4.99
None

Grindcalculator

No in-app purchases

Questions

Is Sleek free?
Sleek is free to download, with in-app purchases available.
Is Grindcalculator free?
Grindcalculator costs $6.99, with no in-app purchases.
Which has better reviews, Sleek or Grindcalculator?
Sleek is rated higher. Sleek averages 5.0 out of 5 from 6 ratings, while Grindcalculator averages 1.0 from 1 ratings.
Do Sleek or Grindcalculator have ads?
Sleek shows ads; Grindcalculator does not.
Which is updated more often, Sleek or Grindcalculator?
Sleek ships an update every 2 months, and Grindcalculator every 4 days. Most recently, Sleek was updated on October 24, 2026 and Grindcalculator on October 24, 2026.

Other comparisons