Comparison

Smooth Breath vs THOTH ECG

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

Head to head

About

Smooth Breath

Features

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A visual cue for smooth, deep breathing. Breathe in as the bar rises and out as it falls. Adjust the rhythm as desired.

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~

Screenshots

Smooth Breath2 screens

THOTH ECG3 screens

Verdict

The call

The clearest difference is update cadence: THOTH ECG at every 8 months against Smooth Breath's every 60 months. THOTH ECG also leads on iOS requirement (13.0 vs 17.6). On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Smooth Breath ships an update every 60 months, THOTH ECG every 8 months. The most recent releases landed on September 20, 2026 and September 18, 2026 respectively.

Scorecard2 real differences · 4 level

Smooth Breath versus THOTH ECG: the parameters behind the verdict, then further details
Parameter	Smooth Breath	THOTH ECG
Price	Free	Free
Update frequency	Every 60 months	Every 8 months — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPad	iPhone, iPod
Requires iOS	17.6	13.0 — better
Further details — not scored
Size	0 MB	5 MB
Age rating	4+	12+
Developer	Koral Oztan Schemel	索思(苏州)医疗科技有限公司

In-app purchases

None

Smooth Breath

No in-app purchases

None

THOTH ECG

No in-app purchases

Questions

Is Smooth Breath free?

Smooth Breath is free to download, with no in-app purchases.

Is THOTH ECG free?

THOTH ECG is free to download, with no in-app purchases.

Do Smooth Breath or THOTH ECG have ads?

Neither Smooth Breath nor THOTH ECG shows ads.

Which is updated more often, Smooth Breath or THOTH ECG?

Smooth Breath ships an update every 60 months, and THOTH ECG every 8 months. Most recently, Smooth Breath was updated on September 20, 2026 and THOTH ECG on September 18, 2026.