Comparison

GM Pro AF vs InchMMark

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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!

About

InchMMark

Features
Read full description

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

GM Pro AF4 screens
InchMMark4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 7 level
GM Pro AF versus InchMMark: the parameters behind the verdict, then further details
ParameterGM Pro AFInchMMark
PriceFreeFree
Rating4.5 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 3 weeksWeekly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size53 MB17 MB
Age rating4+4+
DeveloperGorilla Tools, IncKevin Holzmeyer

In-app purchases

None

GM Pro AF

No in-app purchases

None

InchMMark

No in-app purchases

Questions

Is GM Pro AF free?
GM Pro AF is free to download, with no in-app purchases.
Is InchMMark free?
InchMMark is free to download, with no in-app purchases.
Do GM Pro AF or InchMMark have ads?
Neither GM Pro AF nor InchMMark shows ads.
Which is updated more often, GM Pro AF or InchMMark?
GM Pro AF ships an update every 3 weeks, and InchMMark weekly. Most recently, GM Pro AF was updated on October 20, 2026 and InchMMark on October 14, 2026.

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