# iMolecular Builder

> 3D molecular structure viewer, editor, and builder for scientific analysis. (iPhone/iPad app by song hyunsub.)

- Source: https://appshunter.io/ios/app/imolecular-builder/id299032255 (this page in markdown: same URL + `.md`)
- Developer: [song hyunsub](https://appshunter.io/developer/299032258)
- Category: Education, Productivity
- Price: $7.99
- Rating: 5.00/5 from 2 App Store ratings · 29 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 10 MB
- Languages: English
- Released: 2008-12-06
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/imolecular-builder/id299032255/reviews.md

## What is iMolecular Builder?

The IMoleBuilder is an application that can view, edit and build molecules in 3D. 
Users can easily analyze a molecular structure by rotating, moving, and zooming it.

[Support file format]
   PDB : Protein Data Bank format(*.pdb)
   MOL : MDL Mole files(.mol)
   XYZ : XYZ cartesian coordinates(*.xyz)
   MOL2: Sybyl Mol2 format(*.mol2)
   CIF : Crystallographic Information
   RES : ShelX format [Read-only] 
   SMO : Save all molecular information(include cell, surface, measure information) and view window information(scale, rotation, etc.) (*.smo)

[Open & Save] 
  Device
  FTP Server
  Web(Open only)
  Email(Open an email attachment)
  SMole:(iMoleBuilder for Windows - You can download from IMoleBuilder Support page for free.)
  
[View style]
  Line, Ball, Stick, Ball & Stick, Scaled Ball, Solvent.
Surface, Ribbon, Cartoon, Tube, Trace.

[Work Tool]
  Cursor tool, Info tool, Add tool, Delete tool, Measure tool. 

[Builder]
  Molecular Builder , Crystal Builder, Surface Builder, Carbon Nanotube Builder, Force Field.

[Measure]
  Coordinate, Length, Angle, Torsion information.

## Key features

- 3D molecular structure viewing and editing
- Molecular structure analysis (rotate, move, zoom)
- Support for PDB, MOL, XYZ, MOL2, CIF, RES, SMO formats
- Multiple view styles (Line, Ball, Stick, Surface, Ribbon, etc.)
- Builder tools for molecules, crystals, and nanotubes
- Measurement tools for coordinates, length, and angles

## Recent user reviews (10 of 29)

All indexed reviews: https://appshunter.io/ios/app/imolecular-builder/id299032255/reviews.md

### 5/5 — Hidden treasure

*2013-07-26*

There are many hidden treasure buried in thousands of apps in iTunes Store. This is definitely one of top hidden gem. 
There are a lot of people like me use this app everyday for chem related materials. Everyone speak up. Keep the good updates coming.

### 3/5 — Documentation

*2012-11-19*

I feel that this is an excellent program for the organic chemist. However, I am still trying to figure out how to use the program. For example, when "drawing" a molecule how do I adjust the bond angles? There seems to be NO documentation about the workings of this program, as it doesn't seem to be intuitive. I have a lot of questions on how to perform certain actions in the program. A Google search led me to a Chinese site with no info whatsoever. Some online documentation would be very helpful. It seems like an awesome program, but hard to understand.

### 4/5 — Stop changing my molecule!

*2012-10-05, version 3.1.0*

I'd give this app 5 stars if it didn't change the look of my molecule every time after I save it!

### 4/5 — Be better

*2012-08-17*

Does the software automatically adjusts the atomic distance?? Because I do it the atomic model shape is very strange, some computer software have this function. I hope I spend money to buy this software allow me to get the quality. Finally, I look forward to this software to support Chinese.

### 4/5 — Finally!!!

*2012-02-29*

They brought back the auto-optimization.

### 1/5 — Too hard to view your own files

*2012-02-22, version 1.7.0*

The only way to get your files on there is to use a FTP server, which is dumb. Until the developer implements a SIMPLE DRAG AND DROP feature from iTunes to get your own files on your phone, this is worthless.

### 1/5 — No more "find configuration"

*2011-10-07, version 1.5.0*

there was a time where this app did have automatic aligning tools for showing theoretical configuration but now this features seems gone... Paid 5 bucks for nothing

### 2/5 — Hmm...

*2010-02-25, version 0*

I really wish it could tell you the chemical formula ( or if it doesn't have one, gives the option to change it to one that extremly simmilar)

And if it has one a chemical name

It's just cos at the moment I'm just sticking atoms together not knowing what I'm making, this angers me, because I bought this as sorta an edjacational thing.

### 3/5 — Good job just needs an update

*2010-01-30, version 0*

Great but mabye add drag and drop atom control and the ability to stretch bond length manually

### 3/5 — Auto-Optimazation PLEASE!!!!!

*2009-10-07*

I miss it so.

## Frequently asked questions about iMolecular Builder

### What does iMolecular Builder do?

iMolecular Builder allows users to view, edit, and build molecules in 3D. It provides tools for analyzing molecular structures by rotating, moving, and zooming, and offers various visualization styles.

### What file formats does iMolecular Builder support?

The app supports several common scientific file formats including PDB, MOL, XYZ, MOL2, CIF, and SMO. It can also read RES files, though not edit them.

### How can I open and save files with iMolecular Builder?

Files can be opened and saved directly from your device, an FTP server, or via email attachments. It also supports opening files from the web and saving in the proprietary SMO format.

### What are the different viewing styles available?

iMolecular Builder offers a range of viewing styles to visualize molecules, including Line, Ball, Stick, Ball & Stick, Scaled Ball, Solvent, Surface, Ribbon, Cartoon, Tube, and Trace.

### Is iMolecular Builder free to use?

Yes, iMolecular Builder is a free application. There are no in-app purchases or advertisements mentioned in the provided description.

## Version history (last 5 releases)

### 3.7.1 — 2021-12-02

bug fix.

### 3.7.0 — 2018-10-03

Designing for iPhone X

### 3.6.0 — 2016-02-04

bug fix.
view option: view hydrogen.

### 3.5.0 — 2015-05-14

Designing for iPhone 6 and 6 Plus

### 3.4.0 — 2014-08-28

Designing for iOS 7

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## More apps by song hyunsub

- [iMolecular Draw](https://appshunter.io/ios/app/imolecular-draw/id316980870)
- [iMolecular Builder for iPad](https://appshunter.io/ios/app/imolecular-builder-for-ipad/id412126537)
- [iMolecular Draw for iPad](https://appshunter.io/ios/app/imolecular-draw-for-ipad/id533101604)
- [에스메모(S MEMO) : 클라우드 메모장](https://appshunter.io/ios/app/s-memo/id1168494080)

All apps by song hyunsub: https://appshunter.io/developer/299032258

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*