Comparison

SISTER 進發 vs Helix Angle Calculator

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
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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.

About

Helix Angle Calculator

Features
Read full description

Precision Threading, Simplified Helix Angle Calculator is a fast, free solution for calculating helix angles and selecting the correct anvil (insert shim) for any CNC thread-turning operation. Key Features - One-step calculations – Enter thread diameter and pitch, tap “Calculate,” and you’re done. - Accurate anvil selection – Choose your threading insert type and instantly receive the recommended anvil part number. - Metric and imperial support – Switch effortlessly between mm and TPI. - Offline functionality – No internet required, ideal for shop floor environments. - Multilingual interface – Available in Bahasa Indonesia, Dansk, Deutsch, English, Español, Français, Italiano, Magyar, Nederlands, Polski, Svenska, 繁體中文, 简体中文, 日本語 and 한국어.   Completely free – No ads, no sign-up, just practical tooling knowledge. How It Works 1. Enter the thread’s diameter. 2. Specify the pitch. 3. Select your insert code (e.g., 16ER, 22IR). 4. Instantly view the calculated helix angle and recommended anvil. Expert Guidance Included The app includes safety notes, multi-start thread considerations, and a direct link to a detailed guide on helix angles in thread turning—perfect for both experienced machinists and apprentices. Disclaimer All calculations are provided for reference purposes only. Always verify tooling parameters before machining. SmiCut assumes no responsibility for application results. Enhance precision, extend tool life, and streamline production—download Helix Angle Calculator today.

Screenshots

SISTER 進發1 screens
Helix Angle Calculator4 screens

Verdict

The call

The clearest difference is update cadence: Helix Angle Calculator at weekly against SISTER 進發's every 5 weeks. SISTER 進發's advantage is iOS requirement (13.0 vs 16.6). 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

SISTER 進發 ships an update every 5 weeks, Helix Angle Calculator weekly. The most recent releases landed on November 2, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 4 level
SISTER 進發 versus Helix Angle Calculator: the parameters behind the verdict, then further details
ParameterSISTER 進發Helix Angle Calculator
PriceFreeFree
Update frequencyEvery 5 weeksWeekly — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better16.6
Further details — not scored
Size18 MB8 MB
Age rating4+4+
DeveloperGT MARKET CONSULTING CO., LTD.SmiCut AB

In-app purchases

None

SISTER 進發

No in-app purchases

None

Helix Angle Calculator

No in-app purchases

Questions

Is SISTER 進發 free?
SISTER 進發 is free to download, with no in-app purchases.
Is Helix Angle Calculator free?
Helix Angle Calculator is free to download, with no in-app purchases.
Do SISTER 進發 or Helix Angle Calculator have ads?
Neither SISTER 進發 nor Helix Angle Calculator shows ads.
Which is updated more often, SISTER 進發 or Helix Angle Calculator?
SISTER 進發 ships an update every 5 weeks, and Helix Angle Calculator weekly. Most recently, SISTER 進發 was updated on November 2, 2026 and Helix Angle Calculator on October 28, 2026.

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