Graycode vs Bulbul

This app is used to convert numbers among decimal, hex, binary and gray code. If a user changes any one of these numbers, the other ones will change accordingly. It is a handy calculator for engineers to obtain the binary or gray code values from a decimal, or vise versa. In addition, an animated solution of a Hanoi Tower with three disks is also demonstrated based on the input number.

When you have to hand over your phone, open only the space you are fine showing. Bulbul is a decoy folder and a vault in one: every code opens a different space, and every code opens a real one, so nothing looks hidden. Text codes, patterns, and numeric codes each open a separate space for photos, files, notes, links, and web research. Decoy by design - Keep a decoy code and a real code side by side. - No list of spaces is shown anywhere in the app, not even how many exist. - Nothing looks locked, so nobody asks you to unlock it. Code-addressed spaces - Text codes, patterns, and numeric codes can each open a different space. - There is no exposed list of every space in the app. - There is no master password that opens everything at once. - Decoy spaces are natural: every code opens a real, separate space. Capture into the right place - Share files, photos, and links into Bulbul from other apps. - Pick the code for the space where the item belongs. - Save YouTube and web links as shortcuts inside the right project. - Pin widgets to jump directly into a specific space and tab. Work inside each space - File manager for folders, documents, images, PDFs, and videos. - Markdown editor for private notes and read mode. - Camera that saves directly into the active space, not your camera roll. - Built-in browser with a separate session per space. - Per-space iCloud sync controls when you want a space to stay local. Made for people who - Keep work files, family photos, project notes, and receipts in separate contexts. - Share a device but do not want one visible folder of private material. - Prefer opening only the space they need, instead of unlocking everything. Important - Forgotten codes cannot be recovered. - Bulbul stores data on your device and in the iCloud account you explicitly enable. Requires iOS 26 or later. Universal app for iPhone and iPad.