GM Pro AF vs InchMMark
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GM Pro AF
This app instantly configures running parameters for machining cutters, calculating RPM, IPM, SFM, and Chimp-Loads for various materials. It provides confidence and swagger for shop floor operations and allows sharing of findings.
- Instant configuration of running parameters
- Calculates RPM, IPM, SFM, and Chimp-Loads
- Supports a wide variety of machining materials
- Quick calculations without lengthy questionnaires
- Share machining findings
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The Gorilla Machinist Pro App immediately configures running parameters to put you right in the wheelhouse of all the Gorilla Mill family of cutters. Accurate, dependable, and living on the hairy edge for those “other” end mill and drill lines. RPM, IPM, SFM and Chimp-Loads are calculated at the blink of an eye. A wide variety of machining materials, with no cumbersome long-winded questionnaire asking if all the planets are aligned or if your coolant stinks. And now it’s new and improved! WHAT you say? Yerp, it’s chalked full of calculations and formulas for everything machining so you too can be a “Rock Star” on the shop floor. Walk onto the shop floor with the confidence and swagger of Connor McGregor walking into the Octagon. Share your findings with friends, co-workers, and family…or DON”T and just tell folks it’s all in your noodle upstairs!
InchMMark
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InchMMark is a precision measurement conversion tool designed for makers, machinists, woodworkers, CNC operators, and tradespeople. Simply enter any measurement in fractional inches, decimal inches, millimeters, or centimeters and InchMMark instantly converts to all other formats. FEATURES: - Intuitive fraction wheel for quick selection down to 1/64th inch - Exact fraction calculator for decimal and metric conversions - Full reference chart for all standard fractional inch equivalents - Persistent history of your recent conversions - Copy any value to clipboard with one tap - Clean, simple interface designed for real world use Whether you're in the shop, on the job site, or at the workbench, InchMMark keeps your measurements accurate and at your fingertips.
Screenshots
Verdict
The clearest difference is update cadence: InchMMark at weekly against GM Pro AF's every 3 weeks. InchMMark also leads on iOS requirement (13.0 vs 15.0). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
GM Pro AF ships an update every 3 weeks, InchMMark weekly. The most recent releases landed on October 20, 2026 and October 14, 2026 respectively.
| Parameter | GM Pro AF | InchMMark |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 53 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Gorilla Tools, Inc | Kevin Holzmeyer |
In-app purchases
GM Pro AF
No in-app purchases
InchMMark
No in-app purchases
Questions
Is GM Pro AF free?
Is InchMMark free?
Do GM Pro AF or InchMMark have ads?
Which is updated more often, GM Pro AF or InchMMark?
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