Yomibuddy vs ECG Vector
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Yomibuddy
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Yomibuddy turns any printed page in front of you into a tappable, translatable, AI-assisted reading experience. Photograph a page from a book, a comic, a magazine, or a sign. Yomibuddy uses Google Cloud Vision to detect every sentence on the page — including vertical Japanese (tategaki), handwritten fonts, and dense textbook layouts with furigana. Each sentence becomes a tappable region on the photo. Tap a sentence to instantly see its translation in your target language. Need more help? Open a chat thread tied to that exact sentence and ask anything — grammar breakdowns, alternate translations, cultural context, vocabulary, kanji readings. Each sentence keeps its own chat history. Highlights: • On-photo translation overlay — tap any sentence on the original page. • Powered by Google Cloud Vision OCR + your choice of frontier LLM (Gemini, Claude, or GPT) for translation and chat. • Built-in trial keys so you can start immediately, no setup required. • 20-page rolling library — captured pages and chat threads persist locally on your device. • Vertical Japanese, handwritten typography, picture books, and densely typeset textbook pages all work. • Pre-translates the whole page on capture so tapping a sentence is instant. Designed for language learners reading native-language content who want help without losing the joy of reading the original.
ECG Vector
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ECG Vector is an educational simulator for exploring how electrical activity in the heart relates to ECG waveforms. Switch between six learning workspaces on Mac, iPhone, and iPad. ECG Mechanism Observe 3D activation and repolarization, the cardiac source vector, and lead-axis projections in sync with the ECG. Use single-lead decomposition, two-lead comparison, and the 12-lead view to understand differences in polarity and shape. Ion & ECG Explore educational approximations linking Na⁺, K⁺, Ca²⁺, H⁺ (pH), and major ion currents to action potentials, ECG measures, and clinical conditions. See differences from the reference alongside explanations. Ventricular Action Potential Numerically simulate a single ventricular cell using Luo–Rudy I (1991). View membrane voltage, Na⁺/Ca²⁺/K⁺ currents, conductances, and gates together. Pause at the peak sodium current and compare with the membrane diagram. Cardiac Rhythm View representative regional action potentials on a shared timeline. Adjust the sinus cycle, conduction speed, and AV delay, and explore schematic examples of normal rhythm, bradycardia, tachycardia, and AV block. ECG & Conditions Compare normal and representative clinical patterns in single-lead or 12-lead views, with explanations of waveform features and their mechanisms. Learn & Quiz Identify patterns from the 12 leads and rhythm strip, then deepen your understanding with explanations. Free access includes Adult Normal and Right Bundle Branch Block, all standard 12 leads, fixed electrode placement, four guided Ion & ECG examples, and comparison and quiz samples. The standard ventricular-cell model, stimulus adjustment, playback, current and gate inspection, and all Cardiac Rhythm features are also free. The one-time ECG Vector Pro purchase unlocks unrestricted Ion & ECG adjustment and its synchronized 12-lead response; ventricular-cell conductance adjustment, suppression presets, and comparison with the standard trace; additional pediatric and clinical patterns; custom leads; electrode editing; and the complete comparison and quiz libraries. This is not a subscription. For education only—not diagnosis, treatment decisions, or patient-specific prediction. Ion & ECG uses educational response approximations; the ventricular-cell model is based on guinea-pig ventricular muscle; Cardiac Rhythm uses waveform templates and activation timings. A single-cell membrane potential is not a surface ECG or a QT interval. No sign-in or external hardware is required.
Screenshots
Verdict
The clearest difference is in-app purchases: Yomibuddy at none against ECG Vector's 1. Yomibuddy also leads on update cadence (every 3 days vs every 9 days). 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. ECG Vector sells 1 one-off in-app purchase. Yomibuddy asks for nothing beyond the download.
Yomibuddy ships an update every 3 days, ECG Vector every 9 days. The most recent releases landed on October 11, 2026 and October 14, 2026 respectively.
| Parameter | Yomibuddy | ECG Vector |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 days — better | Every 9 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad | iPhone, iPad, Mac — better |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 84 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | ENSHIN K.K. | Takashi Nakano |
In-app purchases
Yomibuddy
No in-app purchases
ECG Vector
- ECG Vector Pro$6.99









