Comparison

Fibster vs Petschats

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

Head to head
About

Fibster

This app simulates a lie detector test using your phone's camera to analyze heart rate data. It's designed for entertainment, offering a quick, engaging experience to explore physiological reactions to questions.

Highlights
  • Heart rate analysis via camera
  • Simulated polygraph test
  • Question creation guide
  • Quick 80-second tests
  • Entertainment focused
  • iCloud authentication
Features
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Discover Fibster, the most advanced lie detector test app ever created. A leap beyond other lie detector test apps, utilizing the participant's real physiological (heart rate) data. As questions are asked and answered, Fibster analyzes real-time reactions, subtle changes in the intervals between heartbeats, to determine test results. Ideal for lively game nights or a playful peek into what a polygraph test feels like. Based on scientific principles used in professional polygraph practice, Fibster simplifies complex lie detection into an engaging user experience. With just four questions—two baseline, two relevant—dive into a quick, 80-second truth-seeking adventure. The app guides you on creating effective questions in the FAQs, enhancing your Fibster experience. FAQs are accessed by tapping the icon (?) on the top right of the Home Screen. How it works: Fibster uses technology that turns your camera/flash into a photoplethysmogram (PPG), which is what many wearable devices use to measure pulse. This app goes further than simply measuring pulse, beats per minute (BPM); it analyzes the micro time intervals between heartbeats, which is a key indicator for stress. Then by comparing the changes in stress levels between irrelevant and relevant questions, using our scoring algorithm, it determines test results.  The following is a guide to using the app: - Enable iCloud Authentication. - Tap the logo (button) to begin. - Agree to the acknowledgement. - Create two relevant questions, tap next. - Create two irrelevant questions, tap save. - Instructions on question creation are in the FAQs (“?”) section of the app, icon on the top right of the Home Screen. - Review questions, tap start test. - Calibrating message pops up on screen; participant places finger over camera/flash to begin acquiring heart rate data. - Go through all eight test questions. Each question is designed to be at least 10 seconds in order to analyze the required information. - After all questions are completed, the result screen displays the outcome of the test. Attention: - This app is not 100% accurate. - Do not make important decisions based on this app. - Do not force people to use this app (take tests). Disclaimer: This app is designed for entertainment purposes only and is not a substitute for professional polygraph examinations conducted by seasoned examiners with sophisticated instruments. Fibster is not an accredited/recognized polygraph or lie detection device. Heart rate data analyzed during tests is never saved or stored. By downloading and using this app, you agree to the Privacy Policy and Terms of Service: Privacy Policy: https://app.termly.io/document/privacy-policy/42bed339-306e-4d61-b5f3-38364946dd52 Terms of Service: https://app.termly.io/document/terms-of-service/a9202476-3c03-4f35-9764-95dad02fa842

About

Petschats

Features
Read full description

Petschats is a social and dating app for pets where pets are the true protagonists—plus built-in pet-sitting services with trusted Pet Nannies.

Screenshots

Fibster4 screens
Petschats3 screens

Verdict

The call

The clearest difference is price: Petschats at Free against Fibster's $6.99. Petschats also leads on in-app purchases (none vs 3) and device support (3 vs 1). Fibster's advantage is update cadence (every 6 days vs every 7 months). On ads 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

Petschats is free to download; Fibster costs $6.99 up front. Fibster sells 3 in-app purchases, starting at $0.99 per month. Petschats asks for nothing beyond the download.

UpkeepUpdate frequency

Fibster ships an update every 6 days, Petschats every 7 months. The most recent releases landed on October 25, 2026 and October 12, 2026 respectively.

Scorecard5 real differences · 4 level
Fibster versus Petschats: the parameters behind the verdict, then further details
ParameterFibsterPetschats
Price$6.99Free — better
Rating2.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 6 days — betterEvery 7 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaid—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS16.413.0 — better
Further details — not scored
Size2 MB16 MB
Age rating4+17+
DeveloperDrew SmithDIMARIS AQUINO

In-app purchases

3 purchases

Fibster

Subscriptions2
  • Monthly$0.991 Month
  • Annual$7.991 Year
One-time1
  • LifetimeFree
None

Petschats

No in-app purchases

Questions

Is Fibster free?
Fibster costs $6.99, and also offers in-app purchases.
Is Petschats free?
Petschats is free to download, with no in-app purchases.
Do Fibster or Petschats have ads?
Neither Fibster nor Petschats shows ads.
Which is updated more often, Fibster or Petschats?
Fibster ships an update every 6 days, and Petschats every 7 months. Most recently, Fibster was updated on October 25, 2026 and Petschats on October 12, 2026.

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