About V-SPER
Build and observe to come true with figures of repulsion, geometry, angles. V-SPER, free application, is a support for the teaching of the VSPER theory (Valence Shell Electron Pair Repulsion). This theory makes it...
Build and observe to come true with figures of repulsion, geometry, angles. V-SPER, free application, is a support for the teaching of the VSPER theory (Valence Shell Electron Pair Repulsion). This theory makes it possible to predict the geometry of molecules from the sole electrostatic repulsion of valence electron pairs. It is based on the Lewis model of distribution of the valence electrons of the atoms concerned. The latter is a prerequisite to take full advantage of V-SPER. The molecule is denoted AXnEm. The atoms (or portions of molecules) linked to the central atom A are denoted X (n: number of X, whether they are linked by single or multiple bonds). The non-bonding electron pairs belonging to the central atom A and not being involved in bonds are denoted E (m: number of E). V-SPER allows to build simple and 3D objects (molecules) and to display the repulsion figure in blue (FigREP), the molecular geometry in yellow (Geom) as well as the angles. Some angles are just modeled and do not always correspond to experimentally measured angles, such as the relative lengths of single or multiple bonds
Version History V-SEPR – A tool that allows you to model the geometry of molecules based on VSEPR theory (3D), now with the added ability to build Lewis structures directly within the application (2D) — a new feature. Build and observe to become familiar with Lewis structures, repulsion shapes, molecular geometry, and bond angles. You can now navigate between 3D and 2D representations. We look forward to your feedback! 2.0.0 11/02/2025 App update to meet the latest iOS requirements. 1.6.0 07/08/2025 - Added haptic feedback on button click - Fixed multiple bugs 1.5.1 11/04/2024 Update to the latest version of iOS 1.5.0 09/20/2024 Version 1.4.0: Update of the application to match the latest version of iOS. We would like to remind you that some angles are simply modeled and do not always correspond to experimentally measured angles, as well as the relative lengths of single or multiple bonds. This update fixes several bugs, including the issue of the status bar hiding the top of the application. We thank you for your constructive feedback. 1.4.0 04/09/2024 Update text of « About the app » 1.2 11/22/2022 Bug fixes and improved user experience 1.1 10/24/2022 1.0 10/06/2022
Previous Versions
Here you can find the changelog of V-SPER since it was posted on our website on 2024-06-01 10:29:34.
The latest version is 2.0.0 and it was updated on 2026-06-29 13:56:12. See below the changes in each version.
V-SPER version 2.0.0
Updated At: 2026-06-29
Changes: Version History V-SEPR – A tool that allows you to model the geometry of molecules based on VSEPR theory (3D), now with the added ability to build Lewis structures directly within the application (2D) — a new feature. Build and observe to become familiar with Lewis structures, repulsion shapes, molecular geometry, and bond angles. You can now navigate between 3D and 2D representations.
We look forward to your feedback! 2.0.0 11/02/2025 App update to meet the latest iOS requirements. 1.6.0 07/08/2025 - Added haptic feedback on button click
- Fixed multiple bugs 1.5.1 11/04/2024 Update to the latest version of iOS 1.5.0 09/20/2024 Version 1.4.0:
Update of the application to match the latest version of iOS.
We would like to remind you that some angles are simply modeled and do not always correspond to experimentally measured angles, as well as the relative lengths of single or multiple bonds.
This update fixes several bugs, including the issue of the status bar hiding the top of the application.
We thank you for your constructive feedback. 1.4.0 04/09/2024 Update text of « About the app » 1.2 11/22/2022 Bug fixes and improved user experience 1.1 10/24/2022 1.0 10/06/2022
V-SPER version 2.0.0
Updated At: 2025-11-02
Changes: V-SEPR – A tool that allows you to model the geometry of molecules based on VSEPR theory (3D), now with the added ability to build Lewis structures directly within the application (2D) — a new feature. Build and observe to become familiar with Lewis structures, repulsion shapes, molecular geometry, and bond angles. You can now navigate between 3D and 2D representations.
We look forward to your feedback!
V-SPER version 1.6.0
Updated At: 2025-07-08
Changes: Jul 8, 2025
Version 1.6.0
App update to meet the latest iOS requirements.
V-SPER version 1.5.1
Updated At: 2024-11-04
Changes: Nov 4, 2024
Version 1.5.1
- Added haptic feedback on button click
- Fixed multiple bugs
V-SPER version 1.5.0
Updated At: 2024-09-20
Changes: Sep 20, 2024
Version 1.5.0
Update to the latest version of iOS
V-SPER version 1.4.0
Updated At: 2024-04-09
Changes: Apr 9, 2024
Version 1.4.0
Version 1.4.0:
Update of the application to match the latest version of iOS.
We would like to remind you that some angles are simply modeled and do not always correspond to experimentally measured angles, as well as the relative lengths of single or multiple bonds.
This update fixes several bugs, including the issue of the status bar hiding the top of the application.
We thank you for your constructive feedback.
Disclaimer
Official App Store Link
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