Comparison

THOTH ECG vs HearTomo

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

THOTH ECG

Features
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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~

About

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

THOTH ECG3 screens
HearTomo4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences ยท 3 level
THOTH ECG versus HearTomo: the parameters behind the verdict, then further details
ParameterTHOTH ECGHearTomo
PriceFreeFree
Update frequencyEvery 8 monthsEvery 9 days โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPod โ€” betteriPhone
Requires iOS13.0 โ€” better17.0
Further details โ€” not scored
Size5 MB29 MB
Age rating12+4+
Developer็ดขๆ€(่‹ๅทž)ๅŒป็–—็ง‘ๆŠ€ๆœ‰้™ๅ…ฌๅธROBO-HI Corporation

In-app purchases

None

THOTH ECG

No in-app purchases

1 purchases

HearTomo

Subscriptions1
  • Premium Subscription$49.991 Year

Questions

Is THOTH ECG free?
THOTH ECG is free to download, with no in-app purchases.
Is HearTomo free?
HearTomo is free to download, with in-app purchases available.
Do THOTH ECG or HearTomo have ads?
Neither THOTH ECG nor HearTomo shows ads.
Which is updated more often, THOTH ECG or HearTomo?
THOTH ECG ships an update every 8 months, and HearTomo every 9 days. Most recently, THOTH ECG was updated on October 5, 2026 and HearTomo on October 19, 2026.

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