Comparison

SISTER 進發 vs GM Pro AF

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

Head to head
About

SISTER 進發

Features
Read full description

As a professional machine center supplier, we have held the business spirit of “High Speed Cutting, High Quality, Express Service, and Customer First” and it has made SISTER a trusted cutting partner since the founding of SISTER Machine Technology Co., Ltd. in October of 2006. We have carried a wide range of machining centers, such as high speed machine center, vertical machine center, CNC vertical machining center, double column high speed machine center, double column machine, graphite machine center… To help customers increase productivity and maximize their ability to compete, SISTER’s team continuously searches for new technology in the rapid developing Machine Tool Industry and strives to provide top-class quality and services.

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!

Screenshots

SISTER 進發1 screens
GM Pro AF4 screens

Verdict

The call

The clearest difference is iOS requirement: SISTER 進發 at 13.0 against GM Pro AF's 15.0. On price, update cadence, ads and in-app purchases 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

SISTER 進發 ships an update every 5 weeks, GM Pro AF every 3 weeks. The most recent releases landed on October 11, 2026 and October 20, 2026 respectively.

Scorecard1 real difference · 8 level
SISTER 進發 versus GM Pro AF: the parameters behind the verdict, then further details
ParameterSISTER 進發GM Pro AF
PriceFreeFree
Rating—4.5 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 5 weeksEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size18 MB53 MB
Age rating4+4+
DeveloperGT MARKET CONSULTING CO., LTD.Gorilla Tools, Inc

In-app purchases

None

SISTER 進發

No in-app purchases

None

GM Pro AF

No in-app purchases

Questions

Is SISTER 進發 free?
SISTER 進發 is free to download, with no in-app purchases.
Is GM Pro AF free?
GM Pro AF is free to download, with no in-app purchases.
Do SISTER 進發 or GM Pro AF have ads?
Neither SISTER 進發 nor GM Pro AF shows ads.
Which is updated more often, SISTER 進發 or GM Pro AF?
SISTER 進發 ships an update every 5 weeks, and GM Pro AF every 3 weeks. Most recently, SISTER 進發 was updated on October 11, 2026 and GM Pro AF on October 20, 2026.

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