Our Story & Mission
If you have ever watched an intense sports final, a shocking television twist, or a hilarious comedy with family and friends, you know the feeling: something unforgettable happens, everyone in the room erupts, and a few seconds later someone says, "I really wish we recorded that!"
Historically, capturing those moments was exhausting. You had to prop your phone up, hit record, and leave the camera rolling for two to three hours. The result was predictable: a scorching hot phone, dead batteries, tens of gigabytes of wasted storage, and hours spent scrubbing through dead air just to find one 15-second reaction.
We created Fesi to eliminate that entire process. With Fesi, you set your phone down, sit back, and enjoy what you are watching. When you react naturally, Fesi automatically captures the moment, including the crucial two-second buildup that makes the reaction hilarious or emotional.
Our Core Principle: Zero storage waste and zero privacy compromise. You should never have to trade your home privacy or your phone's battery life to preserve genuine memories.
How Fesi Works Under The Hood
Fesi is engineered with a private, low-latency machine learning pipeline running directly on your phone's hardware. Nothing is sent to remote servers or cloud processing farms.
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Vision Landmark Detection
Local computer vision tracks facial expressions in real time, detecting eyebrow raises, jaw drops, laughter, and surprise.
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Acoustic Spike Classification
On-device audio analysis detects sudden spikes in volume and pitch, identifying genuine cheers, gasps, laughs, and screams.
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2-Second Pre-Roll RAM Buffer
A continuous rolling buffer in volatile memory ensures every saved clip includes the setup right before the reaction hits.
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Zero Cloud Transmission
All analysis runs exclusively on your phone's Neural Engine and GPU. Your camera stream is never uploaded anywhere.
When you are just sitting normally, video frames stay in temporary volatile RAM and are continuously overwritten. The moment a combined visual and acoustic threshold is triggered, Fesi stitches the buffered lead-up with the live reaction, saves the clip to your local library, and alerts you with a subtle haptic pulse.
Platform Compatibility & System Requirements
Fesi is optimized for modern mobile hardware to ensure minimal battery impact and maximum responsiveness.
Apple iOS & iPadOS
- Operating System: iOS 17.0 or later (iPadOS 17.0+ supported).
- Hardware: iPhone XR, iPhone XS, iPhone 11 series through iPhone 16 Pro Max. Optimized for the Apple Neural Engine (ANE).
- System Features: Siri Shortcuts ("Hey Siri, start reaction mode in Fesi"), Control Center tile, and Action Button quick trigger.
Android
- Operating System: Android 11.0 (API Level 30) or later.
- Hardware: Compatible with Google Pixel, Samsung Galaxy S and Z series, OnePlus, and all devices supporting CameraX and NNAPI hardware acceleration.
- Distribution: Direct APK installer available directly from our website and supported app stores.
Setup Tips & Troubleshooting
To get the best possible reaction clips while watching movies, sports, or gaming, keep these quick tips in mind:
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Device Angle & Height: Place your phone upright or slightly tilted back on a coffee table, shelf, or desk facing you. Keep it roughly 2 to 4 feet away, centered at chest or eye level.
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Ambient Room Lighting: Fesi works best when your face is reasonably illuminated. If you are watching in a dark home theater, the light coming from your TV screen or a soft side lamp is usually sufficient for facial tracking.
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Sensitivity Adjustment: In Fesi Settings, you can choose between Low, Medium, and High sensitivity. If you are in a loud room with friends, try Medium or Low. If you are watching alone in a quiet room, High sensitivity will catch even subtle chuckles and gasps.
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Hands-Free Siri Voice Control: Eating snacks or lying on the couch? Enable Siri in your iPhone Settings, then simply say: "Hey Siri, start reaction mode in Fesi" to start hands-free.
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Exporting & Sharing: Every saved clip in your Fesi library can be trimmed, favorited, or exported with a single tap directly to TikTok, Instagram Reels, YouTube Shorts, WhatsApp, or your device Photos roll.
Contact & Customer Support
We pride ourselves on responsive, human customer support. If you have questions, run into an issue, or want to suggest an improvement, reach out to our team:
Company Address & Details:
Ruth Technologies, LLC
United States
Official Website: https://fesiapp.com
