Subly: Auto Captions & Subs

Caption, edit, and narrate short videos — all on your iPhone, all private. Try it free, then pay once and keep it forever.

No subscription. No credits that "run out." No account. Your video never leaves your device, so it even works in airplane mode.

• WORD-BY-WORD CAPTIONS — animated, karaoke-style highlight with a live preview.
• PAY ONCE — one purchase removes the watermark and unlocks unlimited, full-quality export. No monthly fees, no token meter.
• ON-DEVICE & PRIVATE — no servers, no uploads, no account. Cloud editors send your footage away and take broad rights to it; Subly never does.
• FULL EDITOR — combine clips, split, trim, and reorder on a scrub timeline with frame-accurate preview.
• TRANSITIONS — dissolve, fade to black, slide, and zoom between clips.
• B-ROLL & MUSIC — drop video overlays and a music bed with auto-ducking and per-clip volume.
• AI NARRATOR — type a script, pick a voice, get a natural voiceover generated entirely on your iPhone. Offline, unlimited, no per-character fees.
• CAPTIONS FROM YOUR SCRIPT — one script becomes both the narrator audio and word-synced captions.
• ENGLISH-FIRST, 90+ LANGUAGES — on-device Whisper transcription.
• PRO FORMATS — export SRT and VTT subtitle files.
• VERTICAL REFRAME — turn landscape clips into 9:16.

Built for Reels, Shorts, and TikTok creators who are done renting their tools.