For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Color Picker by RedKetchup.io - Pick colors from an image, sampler, or spectrum. Convert HEX, RGB, HSL, HSV, CMYK, HTML/CSS colors. Select colors from a PNG, JPEG, WEBP, HEIC, GIF, ICO, TIFF, BMP, or SVG image.
Dropbox - Online Sync and File Sharing
Image Color Picker by PineTools - Pick color from an image. Pinetools' online image color picker.
Google Drive - Access and sync your files anywhere
Bundler - Easy ZIP sharing for iPhone
Mega - Secure File Storage and collaboration