Comparison

Grindcalculator vs StampCam Watermark Camera

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

StampCam Watermark Camera

Easily add GPS timestamps, maps, weather, and custom logos to your photos and videos. Create branded collages, PDFs, or email-ready reports from multiple captures for professional documentation.

Highlights
  • GPS timestamp and location overlay
  • Weather and device information
  • Customizable watermark templates
  • Brand logo integration
  • Create collages, PDFs, and ZIP reports
  • Email-ready work reports
Features
Read full description

【StampCam Camera - GPS Timestamp Watermark App】 Add GPS timestamps, maps, addresses, weather, and brand-logo watermarks to work photos and videos. Turn up to 10 dated captures into branded collages, PDFs, ZIP files, or email-ready work reports. Built for site inspections, attendance, construction, and field evidence. 【Key Use Cases】 Perfect for work photos, team attendance check-ins, construction sites, property inspections, retail store management, field evidence collection, outdoor reporting, and capturing everyday life! 【Rich Watermark Options】 Includes time, date, location, GPS coordinates (latitude & longitude), altitude, weather, device info, custom titles, and notes—fully reconstructing the real story of the scene. 【Professional Watermark Templates】 * Industry-Specific Templates: Tailored watermark templates for construction sites, field inspections, attendance check-ins, property management, and retail store auditing. * Highly Customizable Watermarks: Toggle watermark fields on or off at will. Add multiple lines of custom text/notes and modify colors to design your unique watermark style. * Brand Logos & Work Reports: Choose a preset logo, upload and crop your own, or search for a brand logo. Select up to 10 captured photos by date, then share directly or export a branded collage, PDF report, ZIP, or email-ready record with the watermark details from each capture. * Trustworthy Evidence & Sharing: GPS and time details help keep field records organized. Features instant HD preview, seamless saving, and quick sharing. StampCam Camera: Making your photos and videos more than just images—they are complete, verifiable records of time, place, and ground-truth details.

Screenshots

Grindcalculator4 screens
StampCam Watermark Camera4 screens

Verdict

The call

The clearest difference is price: StampCam Watermark Camera at Free against Grindcalculator's $6.99. StampCam Watermark Camera also leads on rating (4.7 vs 1.0) and review sentiment (100% vs 85%). Grindcalculator's advantage is update cadence (every 4 days vs every 2 weeks). On ads, in-app purchases 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

StampCam Watermark Camera is free to download; Grindcalculator costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

StampCam Watermark Camera holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: StampCam Watermark Camera has 6 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 85% of Grindcalculator's written reviews are positive against 100% of StampCam Watermark Camera's.

UpkeepUpdate frequency

Grindcalculator ships an update every 4 days, StampCam Watermark Camera every 2 weeks. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

Scorecard7 real differences · 3 level
Grindcalculator versus StampCam Watermark Camera: the parameters behind the verdict, then further details
ParameterGrindcalculatorStampCam Watermark Camera
Price$6.99Free — better
Rating1.0 (1 ratings)4.7 (6 ratings) — better
Positive reviews84.6% of reviews100.0% of reviews — better
Number of ratings16 — better
Update frequencyEvery 4 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS26.015.0 — better
Further details — not scored
Size9 MB10 MB
Age rating4+4+
DeveloperRoWo UG辉全 钟

Customer experience

Grindcalculator

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

StampCam Watermark Camera

All ratings6 ratings
Positive83.3%
Neutral16.7%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Grindcalculator

No in-app purchases

None

StampCam Watermark Camera

No in-app purchases

Questions

Is Grindcalculator free?
Grindcalculator costs $6.99, with no in-app purchases.
Is StampCam Watermark Camera free?
StampCam Watermark Camera is free to download, with no in-app purchases.
Which has better reviews, Grindcalculator or StampCam Watermark Camera?
StampCam Watermark Camera is rated higher. Grindcalculator averages 1.0 out of 5 from 1 ratings, while StampCam Watermark Camera averages 4.7 from 6 ratings.
Do Grindcalculator or StampCam Watermark Camera have ads?
Neither Grindcalculator nor StampCam Watermark Camera shows ads.
Which is updated more often, Grindcalculator or StampCam Watermark Camera?
Grindcalculator ships an update every 4 days, and StampCam Watermark Camera every 2 weeks. Most recently, Grindcalculator was updated on October 24, 2026 and StampCam Watermark Camera on October 31, 2026.

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