Comparison

Grindcalculator vs CutMatryx

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

Head to head
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.

About

CutMatryx

Features
Read full description

Turn your parts list into a clear cutting plan. CutMatryx plans one-dimensional cuts for bars, tubes and profiles — for metalwork, woodworking and your workshop. PLAN WITH YOUR MATERIAL Enter quantities, lengths, profiles and material grades. Include existing remnants, purchase lengths, kerf and allowances. See how your parts fit across the bars and what material remains. STRAIGHT AND MITER CUTS Set start and end angles and account for your saw’s capabilities. Clear cutting diagrams help you check orientation and cutting order. FROM JOB TO WORKSHOP Organize projects and parts lists. With Pro, compare purchasing options, plan material costs, release production plans and record your progress. Material, purchasing and workshop PDFs bring the key details together. BRING IN YOUR LISTS With Pro, import CSV, Excel (.xlsx), PDF, images and scans. Export from Numbers as an Excel file first. Check recognized details before accepting them. START FOR FREE Basic includes one saved project with one parts list, up to 10 items and 50 parts. Calculation, straight cuts, miter cuts, remnants and the full PDF preview are included. UNLOCK PRO ONCE A one-time in-app purchase raises project and quantity limits and unlocks imports, saving/sharing/printing PDFs, workshop progress, and purchasing and cost planning. Technical capacity limits still apply. The current price is shown before purchase. Purchases can be restored through Apple. ON IPHONE, IPAD AND MAC Enter data and calculate locally on your device. When iCloud sync is available, your projects stay connected across the same Apple Account. Choose millimeters, centimeters, meters or inches. CutMatryx supports planning and does not control machinery. Check dimensions, materials and saw settings before production. The app optimizes linear cuts, not surfaces or sheets.

Screenshots

Grindcalculator4 screens
CutMatryx4 screens

Verdict

The call

The clearest difference is price: CutMatryx at Free against Grindcalculator's $6.99. Grindcalculator's advantage is in-app purchases (none vs 1) and update cadence (every 4 days vs every 8 months). On ads, 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

CostPrice · In-app purchases · Ads · Monetization

CutMatryx is free to download; Grindcalculator costs $6.99 up front. CutMatryx sells 1 one-off in-app purchase. Grindcalculator asks for nothing beyond the download.

UpkeepUpdate frequency

Grindcalculator ships an update every 4 days, CutMatryx every 8 months. Both last shipped on November 3, 2026.

Scorecard3 real differences · 7 level
Grindcalculator versus CutMatryx: the parameters behind the verdict, then further details
ParameterGrindcalculatorCutMatryx
Price$6.99Free — better
Rating1.0 (1 ratings) — better—
Positive reviews84.6% of reviews—
Number of ratings1 — better—
Update frequencyEvery 4 days — betterEvery 8 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS26.0 — better26.6
Further details — not scored
Size9 MB30 MB
Age rating4+4+
DeveloperRoWo UGEugen Muehl

In-app purchases

None

Grindcalculator

No in-app purchases

1 purchases

CutMatryx

One-time1
  • CutMatryx Pro$4.99

Questions

Is Grindcalculator free?
Grindcalculator costs $6.99, with no in-app purchases.
Is CutMatryx free?
CutMatryx is free to download, with in-app purchases available.
Do Grindcalculator or CutMatryx have ads?
Neither Grindcalculator nor CutMatryx shows ads.
Which is updated more often, Grindcalculator or CutMatryx?
Grindcalculator ships an update every 4 days, and CutMatryx every 8 months. Most recently, Grindcalculator was updated on November 3, 2026 and CutMatryx on November 3, 2026.

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