Photokit is described as 'PhotoKit.com is integrated with a powerful online photo editor, smart brush, image quality enhancement, exposure repairment and image filters, splicing, cropping, transformation, painting, resizing, and can add text, shape, sticker, frame, round corners, etc' and is an app in the Photos & Graphics category. There are more than 50 alternatives to Photokit for a variety of platforms, including Windows, Mac, Online / Web-based, iPhone and Linux. The best alternative is GIMP, which is both free and Open Source. Other great apps like Photokit are Krita (Free, Open Source), Adobe Photoshop (Paid), Paint.NET (Free Personal) and Affinity Photo (Paid).
Photoshop in the browser? Photoshop ? Flattering, but not quite. BitMappery does however allow you to import photos, apply transformations, tweak filters and draw masks in a non-destructive manner. It has some overlap in functionality but is definitely a more simple product.
Fine-tune, watermark, resize, rotate, crop, convert and apply artistic effects to your photos using Image Plus. If you have photos on your Mac that need to be adjusted and watermarked then you are in luck.