Knowho vs Catchtype
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Knowho
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Knowho is a caller ID app built around your personal whitelist — not a spam database. Spam block Apps known spam numbers. But voice phishing numbers change daily. Unknown numbers slip right through. Knowho flips the approach. • You register only the numbers you trust. Everything else? Stay alert. • No matter how many times scammers change their number — they can't fool a whitelist. Features • Import numbers from Notes, SMS, messenger apps — anywhere with a share button • Completely separate from iOS Contacts • Registered names shown automatically on incoming calls • Fully offline · No data collection — Your contacts stay on your device and are never sent to any server
Catchtype
This keyboard automatically switches between Korean and English input without requiring manual language selection. It intelligently detects and corrects language shifts within words and sentences, offering a seamless typing experience. The app prioritizes user privacy with on-device processing and no network access.
- Auto-switching between Korean and English
- Intelligent word-by-word language detection
- Fixes mixed-language words and sentences
- Single layout with Dubeolsik jamo and English letters
- Splits words with internal language switches
- Undo changes with a dedicated key
- On-device processing for privacy
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Catchtype (캐치타입) is a Korean–English auto-switching keyboard (한영 자동 전환): type Korean and English without pressing the language key. It decides word by word whether you meant Korean or English and fixes it as you type: Korean typed in the English state (ㅋㅋㅋ, 넵), Korean attached to English words (deploy했는데, AI로), and English typed in the Korean state (review). When it becomes sure, it also fixes the words before. HOW TO USE 1. Go to Settings > General > Keyboard > Keyboards > Add New Keyboard and choose Catchtype. 2. In a text field, tap the globe key to switch to Catchtype. 3. Just type, without minding Korean or English. If spq typed in the English state gives 넵, it is on. You can also try the Catchtype keyboard inside the app before turning it on. WHAT IT DOES • One layout: each key shows its Dubeolsik jamo and its English letter. • Splits words that switch language inside them (AI로, API를, React에서). • Leaves text alone when unsure. It is built to avoid changing what should stay as typed. • Undo a change with the first slot of the bar above the keys, or with the language key (twice quickly after a space). • Hold delete to keep deleting. • iOS uses its own keyboard in some fields, such as passwords and phone numbers. PRIVACY • Allow Full Access is optional and used only for key vibration, syncing settings and learned words between the app and the keyboard, and pasting what you just copied from the suggestion bar. What you copied is read on the device only: when you tap Paste, or, if you set Paste from Other Apps to Allow in Settings, when the keyboard comes up, to show its start. The keyboard contains no network code and works fully without it. • Every decision is made on the device. What you type never leaves it. • "Learned Words" (words you undo), your "Always Convert" words, recent emoji and the Hanja you pick stay on this device. • No network access, and nothing leaves the device. To find dropped keys and to show the review prompt at a good moment, the keyboard keeps counts on the device (numbers only, no text), and these counts are not sent either. Contact: hebbianai@gmail.com
Screenshots
Verdict
The clearest difference is in-app purchases: Catchtype at none against Knowho's 1. Catchtype also leads on update cadence (daily vs fortnightly). On price, ads, device support and iOS requirement 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. Knowho sells 1 one-off in-app purchase. Catchtype asks for nothing beyond the download.
Knowho ships an update fortnightly, Catchtype daily. The most recent releases landed on October 25, 2026 and November 6, 2026 respectively.
| Parameter | Knowho | Catchtype |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.3 (3 ratings) — better |
| Positive reviews | — | 94.4% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Fortnightly | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Jae Hee SHIM | Hebbian AI Co., Ltd. |
In-app purchases
Knowho
- Knowho Pro$1.99
Catchtype
No in-app purchases









