Comparison

Callibri Biofeedback vs Serene Form

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

Head to head
About

Callibri Biofeedback

This system uses a sensor to measure muscle tone and visualizes your muscle activity in a game-like interface. It's designed for self-regulation training to improve muscle strength and bodily functions.

Highlights
  • Muscle tone evaluation (EMG signal)
  • Visualizes muscle activity in games
  • Muscle restoration for stroke/CP
  • Home fitness muscle strengthening
  • Increases physiological reserves
Features
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The "Callibri Biofeedback" system is designed for self-regulation training sets prepared by specialists with a goal of being able to manipulate the body's systems at will. The application works with "Callibri" sensor that instantly evaluates muscle tone level (the EMG signal) and the app visualizes muscle activity in the form of a game situation. The Callibri Biofeedback system is used for: • restoration of weakened muscles in stroke and cerebral palsy; • training, increasing the strength and functionality of muscles in the field of home fitness; • increasing and maintaining the physiological reserves of the body.

About

Serene Form

Features
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he application "Serene FORM" is designed to overcome the effects of stress. The application works in conjunction with an electronic device that registers physiological parameters from the user's body that objectively reflect his psycho-emotional arousal in real time. The training procedure is not associated with conscious or volitional efforts and occurs through a method known in science as operant conditioning (B.F. Skinner). In practice, the training procedure consists in watching a movie that the user chooses himself. At the same time, the screen with the film periodically turns on and off synchronously with changes in the user's psycho-emotional arousal. This kind of reward and punishment allows the brain to select its internal states and restructure its own work in order to resist the negative effects of stress on the body. 30 sessions of 20 minutes are required each to achieve a reliable result, which will be confirmed by independent testing. To control the result of the training, the application has a built-in test for assessing situational anxiety.

Screenshots

Callibri Biofeedback4 screens
Serene Form4 screens

Verdict

The call

The clearest difference is device support: Serene Form at 3 against Callibri Biofeedback's 1. On price, update cadence, ads and in-app purchases 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

Callibri Biofeedback ships an update every 4 months, Serene Form every 6 months. Both last shipped on November 3, 2026.

Scorecard1 real difference · 8 level
Callibri Biofeedback versus Serene Form: the parameters behind the verdict, then further details
ParameterCallibri BiofeedbackSerene Form
PriceFreeFree
Rating3.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 4 months — betterEvery 6 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.015 — better
Further details — not scored
Size269 MB119 MB
Age rating12+4+
DeveloperBRAINBIT INC.Advanced Yoga Therapy, Inc

In-app purchases

None

Callibri Biofeedback

No in-app purchases

None

Serene Form

No in-app purchases

Questions

Is Callibri Biofeedback free?
Callibri Biofeedback is free to download, with no in-app purchases.
Is Serene Form free?
Serene Form is free to download, with no in-app purchases.
Do Callibri Biofeedback or Serene Form have ads?
Neither Callibri Biofeedback nor Serene Form shows ads.
Which is updated more often, Callibri Biofeedback or Serene Form?
Callibri Biofeedback ships an update every 4 months, and Serene Form every 6 months. Most recently, Callibri Biofeedback was updated on November 3, 2026 and Serene Form on November 3, 2026.

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