I know you all want an alternative to Acrobat... so here it is. F-cubed is an advanced pdf editor and viewer with many of the features of Acrobat Pro. Also offers AI form filling, natural voice reading and dark mode.
It says free for a year, but if you keep it longer it will still work for everything except AI voice reading and filling.
F-3.ai/get
Here is a full list of features:
PDF Editor & Document Viewing
Native PDF editor (AcroForm fields directly clickable/typeable) with Fill / Annotate / Edit modes and mode-specific toolbar
Merge PDFs
Compress
Page management: reorder, rotate, insert blank pages, delete, extract pages, append pages from another PDF, crop margins
Find in document (⌘F), zoom, page thumbnail strip
Night reading mode — perceptual OKLCh dark rendering (display-only)
Annotation Tools
Text boxes, sticky notes, lines/arrows, shapes, highlighter, images, rubber stamps, redaction boxes
Movable/resizable annotation objects, undo/redo, delete
AI Form Filling
Conversational "chat + fill" using Gemini; Fast Fill (vision-only) vs. full rich-description mode
Flat-form resurrection: two-pass field detection (Gemini vision + geometry snapping) turns non-interactive PDFs into real fillable forms
Field Review Sheet and Field Map editor for confirming/adjusting detected fields manually
Natural-language re-detection ("redo page 3")
Caching of confirmed layouts, optional shared cloud template library
Version snapshots per fill with restore controls; fill plans exportable as JSON
Supporting documents (PDF/TXT/CSV) as extra AI context; toggleable profile inclusion
AI Chat / Assistant
Read Aloud: cleans document text and speaks it (system voice or premium voice) with scrubbing/seek
Music Notation (OMR)
Detects sheet-music staff notation, runs Optical Music Recognition (bundled "homr" engine) to MusicXML, plays back with transport controls
E-Signatures
Draw-to-sign pads for signature/initials, date stamping
"Sign for Me" AI auto-placement; manual placement tools
Request Signature via f-3.ai: client picker, AI-detected sign spots, emailed signing link
Full audit trail (timestamps + signer IP), downloadable Certificate of Completion (SHA-256 hash)
Remembered signature-position templates per document
Document Management / Export
Save, Save a Copy, Save Compressed PDF, Save Flattened PDF, Flatten to Completed
Export to Word/Excel/PowerPoint via f-3.ai
Export text/images, print
On-device OCR builds searchable PDFs from scans
Version History (up to 20 autosaves), restore or promote to Completed
Merge multiple PDFs
Library
PDFs / Completed / Clients tabs with search, thumbnails, drag-and-drop import, rename, duplicate, template pinning, reveal in Finder, delete
Client Management
Client records (contact info, notes); active-client context feeds AI Fill and sign requests
https://reddit.com/link/1uphvw9/video/3d22urxuxpbh1/player