SubFrenzy vs WordTrees
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SubFrenzy
Enhance language learning by looping audio or video with synchronized subtitles. Practice pronunciation, translation, and repetition with customizable playback options. Supports AI-powered text-to-speech for subtitle-only practice.
- Audio/video playback with synchronized subtitles
- Subtitle list with skip/rewind functionality
- Double-click subtitle to jump to segment
- Subtitle repetition for listening training
- Bookmark and batch-play favorite subtitles
- Word-by-word translation
- AI-powered American pronunciation for text
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Add audio files (MP3 or M4A format) with corresponding subtitle files. During playback, subtitles are displayed in a list, supporting skip-ahead or rewind based on subtitle cues. Add video files (MP4) with corresponding subtitle files. During playback, subtitles are displayed in a list, supporting skip-ahead or rewind based on subtitle cues. Double-click a subtitle in the list to jump to the corresponding segment in the audio or video playback. Set the number of repetitions (3–99 times) for a single subtitle line to enhance listening training, with adjustable intervals to customize the rhythm for shadowing practice. Bookmark subtitles during playback, and practice them efficiently by batch-playing from the favorites list. Click on a subtitle to trigger word-by-word translation (local translation). Even without audio or video files, upload subtitle files alone to play subtitles using authentic American pronunciation powered by AI-trained models. Supports playback speed adjustment, software interface language settings, and more, with continuous updates. The software includes a user guide with detailed instructions and screenshots.
WordTrees
This app uses AI to break down words into their roots, prefixes, and suffixes, revealing their origins and semantic connections. It builds a visual word network, expanding vocabulary through derivatives and related terms for efficient learning.
- AI-powered word dissection
- Root, prefix, suffix analysis
- Word relationship network
- Visual tree diagram display
- Vocabulary expansion tools
- Native iOS design
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WordTrees helps you understand English words and keep them close as you read. LOOK UP WITH CONTEXT Search the built-in offline dictionary for definitions, pronunciation, word structure, and related vocabulary. Explore roots and affixes to see how a word is formed. AI analysis is available as a separate, user-initiated option. MAKE VOCABULARY YOUR OWN Save words, organize personal libraries and folders, and review them in a focused study mode. Choose from built-in vocabulary lists or import your own words. READ AND LEARN Browse English articles in a clean in-app reader. Tap a word in the text for a quick explanation, then continue reading. Save articles and resume from your reading history. You can also add supported ebooks to your personal shelf. SEE CONNECTIONS Visual word maps and related-word views make it easier to discover how vocabulary connects. WordTrees combines lookup, reading, and review in one place for everyday English learning and exam preparation. Some AI features require network access and may have usage limits. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: WordTrees at none against SubFrenzy's 4. 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
Both are free to download. SubFrenzy sells 2 one-off in-app purchases. WordTrees asks for nothing beyond the download.
SubFrenzy ships an update every 9 days, WordTrees weekly. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.
| Parameter | SubFrenzy | WordTrees |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 9 days | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17 — better | 17.6 |
| Further details — not scored | ||
| Size | 202 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | 晓明 张 | 祖浪 吴 |
In-app purchases
SubFrenzy
- 小幕狂听2 variants$9.99
- 小幕狂听2 variants$14.99
WordTrees
No in-app purchases
