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.
SISTER 進發
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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.
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!
Screenshots
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
| Parameter | SISTER 進發 | GM Pro AF |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.5 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 5 weeks | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 18 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | GT MARKET CONSULTING CO., LTD. | Gorilla Tools, Inc |
In-app purchases
SISTER 進發
No in-app purchases
GM Pro AF
No in-app purchases









