Readibu vs Cusp
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Readibu
Access a vast library of Chinese web novels, short stories, and children's tales. Enhance your learning with integrated dictionary lookups, text-to-speech, and pinyin display. Premium features offer advanced tools like sentence translation and offline reading for an immersive language learning experience.
- Explore Chinese web novels
- Tap for character definitions
- Reader mode for web pages
- Pinyin/zhuyin display
- Text-to-speech
- Offline reading (Premium)
- Sentence translation (Premium)
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Discover new stories and worlds in Chinese! Ready to move beyond flashcards and graded readers? Readibu is your portal to the world of popular Chinese web novels, short stories and children stories enjoyed by native readers — or bring your own books and read them the same way. From historical to sci-fi or romance to horror, there's always something good to read. Readibu is a Chinese reading app where you can: 1. Explore popular web novels, short stories, and children stories from native Chinese sites — browse by ranking, category, or search 2. Import your own EPUB, PDF, or TXT files and read them alongside your web library 3. Tap on characters for definitions 4. Open web pages in a reader for immersive reading 5. Absorb the language while you're immersed in gripping adventures Supported features: • Tap for dictionary • Text-to-speech • Simplified and traditional conversion • Pinyin/zhuyin display over words • Add custom url to display in reader • Import EPUB, PDF, and TXT files into your library • Organize your reading with collections, bookmarks, and history • Check the difficulty of any text with HSK-level breakdowns • Look up words in Pleco, MDBG, Yellow Bridge, Baidu Translate, and more • Export saved vocabularies • Auto-detect next chapter • Auto-save last page you were on • Back up and restore your library and vocabulary ================================ ENHANCE YOUR READING EXPERIENCE WITH READIBU PREMIUM • Cloud sync - Sync subscription, library, bookmarks, vocabs and reading progress between devices • Sentence Translation - Unlimited translation by Google Translate • Image Search - Display image search results for selected text • Offline Reading - Download pages for reading offline • Quiz Mode - Quiz your pinyin, tones, and definitions of words you looked up before • Smart Name Recognition - Detect names of people, orgs and places in content • Syntax Analysis - Analyze syntax of sentence Free trials included with all plans! 1-month subscription: $4.99 per month 3-month subscription: $9.99 per month 12-month subscription: $47.99 per year Payment will be charged to iTunes Account at the end of your free trial period. Your subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current billing period or trial. Your account will be charged for renewal within 24 hours before the end of the current period. You can manage and cancel subscriptions in your Itunes Account settings. Privacy Policy: https://www.readibu.com/privacy Terms & Conditions: https://www.readibu.com/terms Have questions? Feel free to contact us at support@readibu.com.
Cusp
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Most language apps tell you how many words you have learned today. Cusp tells you how many hours stand between you and the level you actually want — and turns that number into a plan you can log against. HONEST HOURS The estimate comes from Cambridge English guided-learning hours per CEFR level, scaled by how far your target language sits from English using the FSI difficulty categories. Japanese takes roughly three times as long as Spanish, and Cusp says so. Every number is computed, not generated. A REAL PLAN Answer five questions about what you can do today and Cusp estimates your level, then builds a plan sized to the time you actually have: four phases, a goal for every month, and a weekly template split across four kinds of study. THREE RINGS A DAY • Input — podcasts, shows, reading • Recall — spaced repetition • Production — lessons, writing, recording Roughly a third input, a sixth recall, half production. The split follows the instructed second-language-acquisition literature: comprehensible input, spaced retrieval, pushed output and corrective feedback. SEE WHETHER IT IS WORKING Your real pace against the plan. A projected finish date that moves as you do. Consistency, streaks, your strongest and weakest weekday, and where your balance has drifted. Monthly checkpoints prompt you to re-measure rather than guess. CARDS THAT COME FROM YOUR OWN MISTAKES Capture a correction from your tutor while it is fresh, then export your cards as a tab-separated text file that spaced-repetition apps such as Anki can import. A weekly cap keeps the review load from collapsing. BUILT PROPERLY • No accounts, no subscriptions, no adverts, no analytics and no third-party SDKs. • Your log stays on your device and, if you use iCloud, in your own private iCloud database. Nobody else can read it — including us. • Syncs across iPhone and iPad. • Full Dynamic Type, VoiceOver, Reduce Motion and Differentiate Without Colour support. • Optional daily reminder, scheduled on your device, that skips any day you have already logged. • Export everything as JSON or CSV whenever you like. Your data is yours to take. Cusp is a planning tool, not a promise. The hour bands are published estimates measured for English speakers, and your own progress will differ. Cusp does not test or certify your level, and it is not affiliated with, endorsed by, or sponsored by Cambridge University Press & Assessment, the Foreign Service Institute, or any exam provider or language-learning service.
Screenshots
Verdict
The clearest difference is in-app purchases: Cusp at none against Readibu's 3. Readibu's advantage is iOS requirement (13.0 vs 17.0). On price, 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. Readibu sells 3 in-app purchases, starting at $4.99 per month. Cusp asks for nothing beyond the download.
| Parameter | Readibu | Cusp |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (159 ratings) — better | — |
| Positive reviews | 91.9% of reviews | — |
| Number of ratings | 159 — better | — |
| Update frequency | Every 8 days | — |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 88 MB | 2 MB |
| Age rating | 17+ | 4+ |
| Developer | Lingyi Chen | Furkan Kizmaz |
In-app purchases
Readibu
- Readibu Monthly Premium14 Days trial$4.991 Month
- Readibu 3-Month Premium14 Days trial$9.993 Months
- Readibu Yearly Premium14 Days trial$47.991 Year
Cusp
No in-app purchases









