THOTH ECG vs HearTomo
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
THOTH ECG
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THOTH ECG (wearable dynamic electrocardiogram recorder software) can monitor heart rate for a long time, display dynamic electrocardiogram in real time, and also view heart rate in real time. When the heart rate exceeds the set expected value, there will be a sound reminder to inform, making it a good assistant for your daily life. Function: -View real-time electrocardiogram; -View real-time heart rate; -When the heart rate exceeds the set expected value, there is a sound reminder to inform; Note: This app does not replace seeking medical treatment at a hospital. If you experience any discomfort during the monitoring process, please consult a doctor or professional as soon as possible~
HearTomo
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HearTomo is an app that works with Apple Health to perform 1/f fluctuation slope, Lorenz plot, and emotion analysis from ECG data from Apple Watch. 1/f Fluctuation Slope Value The heartbeat interval RRI data is converted to power spectral density PSD and the 1/f fluctuation slope value is calculated. You can see the value change over time in a graph: day, week, month, 6 months, and 1 year. Lorenz Plot One of the time domain indicators of autonomic nerve activity, RRI(n) is the interval between the nth heartbeat and the heartbeat before it. The value of RRI(n) is plotted on the x-axis and the value of RRI(n+1) on the y-axis. Order-made Emotion Analysis The accumulated data of the user is learned and updated daily to estimate emotions that suit the individual. The activity status of the sympathetic and parasympathetic nerves is classified into four states: "Both nerves are high", "Only sympathetic nerves are high", "Only parasympathetic nerves are high", and "Both nerves are low". Emotions are estimated as "inner voice". HearTomo's basic technology HearTomo development is based on the heart rate data analysis system patent 6430729 in collaboration with ZMP and Mr. Osaka Motohisa (graduate of the Department of Mathematics, Faculty of Science, University of Tokyo and the Department of Medicine, Faculty of Medicine, Nippon Medical School, currently Professor Emeritus, Nippon Veterinary and Life Science University). Mr. Osaka Motohisa conducted heart rate fluctuation analysis using his own calculation formula and an algorithm for spectral analysis of heart rate variability developed by Professor Ronald Berger from Johns Hopkins University Hospital. To improve the accuracy of the analysis, let's capture a clean heart rate waveform. Fix your arm on a table or your knee, and keep your fingers still for 30 seconds. After scrolling down to see the measurement results and tapping 'Done,' perform another 30-second measurement. A total of 4 repetitions, requiring 2 minutes of data, is necessary, and compared to other apps' 30-second measurements, HearTomo offers 4 times higher accuracy. Try to perform 4 consecutive measurements without leaving too much time between them. Website: https://heartomo.com/?lang=en Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: THOTH ECG at none against HearTomo's 1. THOTH ECG also leads on iOS requirement (13.0 vs 17.0). HearTomo's advantage is update cadence (every 9 days vs every 8 months). On price, ads and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. HearTomo sells 1 in-app purchase, starting at $49.99 per year. THOTH ECG asks for nothing beyond the download.
THOTH ECG ships an update every 8 months, HearTomo every 9 days. The most recent releases landed on October 5, 2026 and October 19, 2026 respectively.
| Parameter | THOTH ECG | HearTomo |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 8 months | Every 9 days โ better |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPod โ better | iPhone |
| Requires iOS | 13.0 โ better | 17.0 |
| Further details โ not scored | ||
| Size | 5 MB | 29 MB |
| Age rating | 12+ | 4+ |
| Developer | ็ดขๆ(่ๅท)ๅป็็งๆๆ้ๅ ฌๅธ | ROBO-HI Corporation |
In-app purchases
THOTH ECG
No in-app purchases
HearTomo
- Premium Subscription$49.991 Year









