VERSION 1.5.1 * Fixed addition and selection of atoms on iOS 16.1.2 * Discontinued support for iOS 12

VERSION 1.5.0 * Added a file manager: now you can organize your library by creating folders and putting molecules inside * Added two-finger rotation and panning * Added "Add" menu item that allows to select a chemical element and then add it multiple times to the screen * Replaced a long-press gesture to insert a molecule with a "Molecule" button in "Choose element" popup, see help * Removed bond popup. To update or delete an existing bond select an atom and keep tapping the attached atom * Removed "Dragging" menu item * Removed double-tap that was used to switch between rotational and translational modes in favor of two-finger gestures * Fixed bond deletion when at least one of connected atoms has moved * Removed Delete button from New atom popup, pressing which was causing the app to crash * Added hydrogen addition to undo/redo history * Limited undo/redo history to 20 items * Added delete confirmation popup * Added molecule name to overwrite popups * Added Mn * Added Na-C bond * Increased maximum valence for boron to 4 * Fixed some bugs that caused app crashes * Discontinued support for iOS 9 and 10

VERSION 1.4.0 * Added undo and redo buttons * Added share molecule feature * Added automatic addition of hydrogen atoms (to C, N and O), tutor updated * Saved molecules can be now access outside the app (see Help) * Added approximate chemical formula * Added molar mass calculation * Added screenshot feature * Added rename molecule feature * Added Browse option to open externally stored MC molecules * Replaced Model menu with Tools menu and moved Model to Settings * Added multiple toasts (short messages 2 seconds long) to improve app feedback * Fixed app crashing when tutorial is finised * Removed "Make sp2/sp3" button for nitrogen, now app can decided automatically * Refactored menu * Axes and translucent plane are invisible by default (but still in Settings) * Added ethanol to examples (library) * Updated Help * Added new bonds: Mg-B, Mg-Mg, K-N, Fe-N, P-P, P=P, C#Al, Al=O, P-S, Fe-S, Fe=S, As-S, Fe-As * Increase maximum valence of Fe to 6 * Changed aluminum hybridization to sp2 * Added cobalt

VERSION 1.3.0 * Added molecule insertion: long press and choose from popup menu (most requested feature) * Fixed app crash when As and Se have more than four bonds * Fixed app crash when atom is changed * Added small hydrogens setting * Added tutorial on/off setting * Added text color setting * Added Info menu with What's new, Help, Rate! and About items * Increased maximum valence of Cl to 7 to allow ClO2 and ClO4. * Increased maximum valence of N to 4 to allow resonance structure of HNO3 with 2 single and 1 double bonds * Added new bonds: P-N, H-Cl, Cl-Cl, Na-O, K-O, Fe-C, Fe-O, K-I, Mg-I and Mg-N * Added iron * Added two app previews * Fixed thumb position on color sliders * Fixed occasional app crash when adding a bond