Comparison

CaptionFlow vs subMatik

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CaptionFlow

Features
Read full description

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Unlock real-time bilingual video captions & turn any video into language practice! CaptionFlow is the smartest way to learn languages naturally. Get instant AI-powered translations on video captions and text — perfect for immersion learning without ever leaving your favorite content. Watch & Understand • Load any video and follow along with live bilingual captions • Translate captions into your target language while you watch • Stay focused on meaning instead of constantly pausing Read with Confidence • Paste articles, news, or study material for easy dual-language reading • Great for essays, YouTube videos, podcasts, and daily content Free vs Pro Free: First 60 seconds per video + first 50 sentences per text Pro: Unlimited full videos & full text — no interruptions Made for Real Learning Practice listening + reading every day. Small moments add up to fluency. Perfect for language learners who want AI captions translator, bilingual subtitles for videos, real-time translation, and video subtitle translator all in one beautiful iOS app. Start learning smarter today — download CaptionFlow now! Subscriptions managed in Apple ID settings. Cancel anytime. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

subMatik

This app transforms your iPhone into a subtitle creation studio. It automatically generates accurate, timed captions for any video or audio file directly on your device, supporting over 70 languages. You can also translate existing captions or burn them directly into your video for easy sharing.

Highlights
  • On-device AI transcription
  • 70+ language support
  • Context-aware translation
  • Vertical-friendly subtitle placement
  • Burn-in subtitles to video
  • SRT and MP4 export
Features
Read full description

subMatik turns your iPhone into a complete subtitle studio. Drop in any video — vertical Reels, horizontal interviews, podcast audio — and get clean, timed captions in seconds. Transcription, burn-in, and export run on-device; translation is on-device with Apple Translation, or via Google/DeepL if you choose. WHAT MAKES SUBMATIK DIFFERENT • 100% on-device transcription via the Whisper speech model (WhisperKit). Your audio never touches a server. • 70+ languages supported, including Turkish, Chinese (Simplified + Traditional), Japanese, Korean, Thai, Khmer, Lao, Burmese, and more. • Context-aware translation. Each segment is translated alongside its neighbors so idioms and homonyms come out right. • Vertical-friendly subtitle placement. The Position Picker has a 3×3 anchor grid + drag-to-tune fine adjustment over a real frame from your video — no guessing. • Reels mode. Chops cues into 1–5 word bursts that read fast on phone screens. • Burn subtitles into the video pixels. Export an MP4 with captions baked in, ready for Instagram / TikTok / YouTube Shorts. Save directly to Photos. • Re-translate any existing SRT into a new language without re-running Whisper. • Files-app integration. Right-click any video → "Open in subMatik" → ready to caption. • No account, no ads, no analytics dragnets. Optional anonymous crash telemetry via Apple MetricKit only. WHY ON-DEVICE MATTERS Modern Whisper models run entirely on your iPhone. There's no reason to upload your private conversations, family videos, work recordings, or proprietary content to someone else's server just to get subtitles. subMatik proves that the highest-quality transcription can be the most private one too. OUTPUT FORMATS • SRT (universal, supported everywhere) • Burned-in MP4 (subtitles in pixels, no separate file needed) PRO TIPS • "Upper third" position preset keeps subtitles clear of TikTok / Reels bottom UI. • Long-press any file in the queue to set a custom subtitle anchor just for that clip. • DeepL users: paste your API key in Settings for higher-quality translations on European languages. • On first launch you choose a Whisper model — from a fast ~150 MB option up to the highest-accuracy one. It downloads once (use Wi-Fi). After that, transcription is fully offline. REQUIRES iOS 26.0 OR LATER. Works on iPhone 11 and newer. Best experience on iPhone 14 Pro and newer. PRIVACY POLICY: https://catheadai.com/submatik/privacy

Screenshots

CaptionFlow4 screens
subMatik4 screens

Verdict

The call

The clearest difference is in-app purchases: subMatik at none against CaptionFlow's 3. CaptionFlow's advantage is iOS requirement (18 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. CaptionFlow sells 3 in-app purchases, starting at $0.99 per 7 days. subMatik asks for nothing beyond the download.

UpkeepUpdate frequency

CaptionFlow ships an update every 10 days, subMatik every 3 weeks. The most recent releases landed on October 12, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 7 level
CaptionFlow versus subMatik: the parameters behind the verdict, then further details
ParameterCaptionFlowsubMatik
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 10 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhoneiPhone
Requires iOS18 — better26.0
Further details — not scored
Size10 MB7 MB
Age rating4+4+
DeveloperMehmet Erdem DevgeSevki Bugra Ozbek

In-app purchases

3 purchases

CaptionFlow

Subscriptions3
  • Pro Weekly$0.997 Days
  • Pro - Montly$2.991 Month
  • Pro Yearly$14.991 Year
None

subMatik

No in-app purchases

Questions

Is CaptionFlow free?
CaptionFlow is free to download, with in-app purchases available.
Is subMatik free?
subMatik is free to download, with no in-app purchases.
Do CaptionFlow or subMatik have ads?
Neither CaptionFlow nor subMatik shows ads.
Which is updated more often, CaptionFlow or subMatik?
CaptionFlow ships an update every 10 days, and subMatik every 3 weeks. Most recently, CaptionFlow was updated on October 12, 2026 and subMatik on October 24, 2026.

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