A mature PDF editor with solid annotation tools, but it broke user trust by revoking already-paid features.
評価点：Precise text alignment with snap guides when adding text. Annotation for academic work with Apple Pencil. Users from 2017-2018 praise stability and speed under the old model.
不満点：The company revoked features from users who had paid for a lifetime license. PDF tabs close when switching between apps, and some articles fail to load fully.
向いている人：Those willing to subscribe who need a professional editor for annotation on iPad.
A PDF editor with powerful capabilities, but the interface is cluttered with AI features and annotations disappear.
評価点：Paid subscribers value PDF markup and form work on desktop. Basic PDF reading and document navigation are stable.
不満点：Markup (annotations) disappears on reopen for about half of users. Exporting a PDF with markup takes too many steps and often doesn't work as expected.
向いている人：People already in the Adobe ecosystem who work with PDF forms on desktop and use mobile as a fallback.
A feature-rich PDF toolkit with a wide range of operations but a rough UX in complex workflows.
評価点：Compression, merging, splitting, and JPG conversion all in one app. Users say it replaces Acrobat for everyday tasks.
不満点：Every action exports a new file to a new folder, so you can't chain multiple operations in sequence. The app crashes without auto-save, which means all work is lost.
向いている人：People who work with PDFs regularly and need a wide range of operations without Adobe.
A basic PDF editor for one-off form filling, an Adobe alternative without deep editing.
評価点：Quickly handles form filling without an Adobe subscription. The interface is simpler than professional editors.
不満点：Color images get converted to black and white during editing. Document formatting is not retained on re-open as the app doesn't recognize its own markup.
向いている人：People who fill a form once a month and don't want to pay for Adobe.
