Your jaw works harder than you think — and Masseter helps you notice.
Bruxism affects up to 31% of adults. Jaw clenching, teeth grinding, and TMJ tension often go unnoticed until the damage is done: headaches, worn enamel, chronic pain, disrupted sleep.
Masseter is a science-backed awareness tool that uses Ecological Momentary Assessment (EMA) — the gold standard in behavioral research — to help you catch clenching in real time, build mindful habits, and reduce jaw tension over time.
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HOW IT WORKS
- SMART REMINDERS — Random check-ins throughout your active hours. No predictable patterns. Based on the same stratified-random sampling used in clinical studies.
- ONE-TAP CHECK-IN — When prompted, simply log whether you're Relaxed, In Contact, Clenching, or Bracing. Takes 2 seconds.
- TENSION INDEX — See your daily jaw tension score on a beautiful radial gauge. Track progress over days and weeks.
- CONTEXT TAGS — Tag what you're doing when you clench (work, commute, sleep). Discover your personal triggers.
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INSIGHTS THAT MATTER
- Hourly tension heatmaps — see when you clench most
- Day-of-week analysis — discover your worst days
- Context correlations — find which activities drive tension
- 30-day trend charts — watch your progress unfold
- Peak tension alerts — identify your danger zones
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LEARN & UNDERSTAND
4 in-depth articles written in plain language:
- The Masseter Muscle — physiology of jaw tension
- The Spot Technique — awareness building method
- Relief Protocol — acute pain management
- Sleep Hygiene — nighttime bruxism strategies
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DESIGNED FOR YOUR LIFE
- Apple Watch — check in from your wrist
- Home Screen Widget — one-tap logging without opening the app
- Quick Actions — fast shortcuts for instant check-ins
- Lock Screen Notifications — respond directly from the notification
- iCloud Sync — seamless data across all your devices
- Baseline Pain Assessment — track jaw, temple, and neck pain over time
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PRIVACY FIRST
Your jaw data stays on YOUR device. No accounts required. No data sold. Optional iCloud sync is encrypted end to end. See our privacy policy for details.
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WHO IS MASSETER FOR?
- People diagnosed with bruxism or TMJ disorder
- Anyone who catches themselves clenching during stress
- Night guard users who want daytime awareness
- Dental patients tracking jaw habits between appointments
- Anyone experiencing jaw pain, headaches, or facial tension
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Masseter doesn't replace your dentist — it gives you the data to have a better conversation with them.
Download Masseter and start building jaw awareness today.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
This update improves reliability across Masseter.
• Fixed a rare crash in Insights.
• Improved Apple Watch settings sync.
• Made sleep data, purchases, and reminder scheduling more resilient when your device is offline, locked, or temporarily unavailable.
• Includes additional stability improvements.
Version 1.6.4
The developer, Mateusz Zajac, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Usage Data
Diagnostics
Privacy practices may vary based, for example, on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More
Supported Features
VoiceOver
Larger Text
Dark Interface
Information
Provider
Mateusz Zajac
Size
60.4 MB
Category
Health & Fitness
Compatibility
Requires iOS 26.0 or later.
iPhone Requires iOS 26.0 or later.
iPad Requires iPadOS 26.0 or later.
Mac Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
