Square to Round Developer app icon

Square to Round Developer

Sheet metal developing tool for square/rectangles to rounds

Gellis apps · appinventor.ai_1954gellis.Square_to_round_developer

Not rated yet 5K+ downloads vOctober 25 update 4.9 MB Android 4.0+ PEGI 3 · Everyone

Download APK 4.9 MB All versions
  • Signature matches the Google Play version Details

At a glance

Latest version
vOctober 25 update (9)
Updated
Jan 23, 2026 (8 months ago)
APK size
4.9 MB
Requires
Android 4.0+ (API 14)
CPU support
Any (no native code)
Category
Tools (app)
Listed since
Mar 23, 2023 (at least)
Permissions
2 (1 sensitive)
Developer contact
[email protected]

About this APK

Square to Round Developer is an app by Gellis apps in the Tools category, listed since at least March 2023. It has no native code, so it runs on any Android processor.

Since version Sept 23 update, the minimum Android version rose from 2.1 to 4.0. It asks for 2 permissions, 1 of them sensitive: read shared storage. It asks for the same permissions as version Sept 23 update.

Description

From the listing uploaded by “appupdater”.

As a fabricator of 40+ years, the last 30 or so as the workshop manager, I have constantly used trigonometry etc. to calculate cones, segmental bends and much more. Nowadays I am constantly asked by the fabricators to calculate developed lengths etc. to save them the time and effort of laying it out. I have developed this app so that they can do it for themselves and therefore save “MY TIME”. With this app you can quickly and easily develop patterns for square to rounds, rectangle to rounds, rounds to squares and round to rectangles. Simply choose the type of square to round you wish to develop, enter the required outside dimensions and material thickness then press develop. The developed pattern can then be marked onto the plate ready for cutting and shaping. Instructions on how to mark out completely by hand and how to mark developed pattern onto plate are included. I hope that from your feedback/comments I will be able to add extra relevant features and amendments in future editions.

Version history

2 versions are listed, going back to vSept 23 update. Since vOctober 25 update it requires Android 4.0+.

vOctober 25 update LATEST Jan 23, 2026 4.9 MB TRUSTED vSept 23 update Jun 27, 2026 4.7 MB TRUSTED

All 2 versions

Security & authenticity

Security rating: Trusted

Signing certificate

  • Signature matches the Google Play version Checked by the source store on Jan 23, 2026.
  • Certificate issued to “AppInventor for Android” This is the certificate of the Google Play version.
  • Same certificate as the other version checked

Store checks and file details

  • Developer signature verified Jan 23, 2026
  • Validated against Google Play Jan 23, 2026
  • Signed by[email protected], O=AppInventor for Android, C=US
  • Signing certificate (SHA-1)F7:48:7A:11:3C:52:AD:97:AD:6E:9C:6B:5E:57:EE:A7:CE:D2:FE:7D
  • File MD507653fb273af09767e97112a89252b82
  • Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (1 other version compared). AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (2)

Square to Round Developer requests 2 permissions, 1 of them sensitive.

Required hardware & features

Square to Round Developer APK: questions and answers

Is there a version of Square to Round Developer for older Android phones?

The current version needs Android 4.0 or later. Version Sept 23 update is the newest listed build that installs on Android 2.1 and later. Get version Sept 23 update · All versions

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the Square to Round Developer APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. It is signed with the same certificate as the other version checked. After downloading, check that the file's MD5 is 07653fb273af09767e97112a89252b82.

Tags

appinventor ai_1954gellis square_to_round_developer tools

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