A guy just moved

@ai.samaritan

11.4K followers · usually 3.3K views a post

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Selling · SaaS › Other SaaS

Sender.fyi practically.ai ↗

Why it worked

The video highlights a novel and practical solution to a common problem (transferring files offline) using an innovative method (QR codes). The explanation of the underlying technology and the creator's relatable philosophy on side projects likely resonated with the audience.

Summary

This video showcases Sender.fyi, a tool that transfers files between devices using QR codes, eliminating the need for Wi-Fi, Bluetooth, cables, or internet. It explains the technology behind it, including fountain codes, and highlights its utility for offline file transfers, comparing its speed to old dial-up modems.

Structure

1Introduction to file transfer without connectivity
2Demonstration of Sender.fyi using QR codes
3Explanation of the technology (fountain codes)
4Comparison to old technology and limitations
5The creator's philosophy on building side projects
6Promotion of PracticallyAI

Original caption

A guy moved a file from his laptop to his phone. no wifi, no bluetooth, no cable, no internet the phone just looked at the screen 😭 The laptop flashes QR codes like 30x a second, phone camera reads them. it's morse code except the flashlight is your monitor 1️⃣ It's genuinely air-gapped. The data is light. Works on a plane, offline, anywhere — nothing to intercept because there's no network. 2️⃣ Fountain codes. Math that lets the phone miss frames from blur or glare and still rebuild the file perfectly. Point your camera at it halfway through and it catches up. 3️⃣ He didn't grind on this for months. He described it to AI and shipped it. Real talk: dial-up speed. Small files only, not your vacation footage. But a data-over-light protocol used to be a research project. Now it's one person's weekend joke. The cost of trying stupid ideas just hit zero. And stupid ideas are where the good ones hide. #learnai #aitips #aitools #vibecode

More from @ai.samaritan

Their other posts in the index, biggest breakout first.

On-screen text

through the Sender Camera. Choose a File Browse Files Send File Tune the channel File ID Sender Receiver Camera access allowed Edit Receiving RaptorQ symbols 12% Single QR Robust enough Effective File Rate 48 KB/s 48 KB/s native Incoming File 183 KB 25 symbols 20 KB JPG Modified 20.8 FPS 183 KB transferred in 3.500 seconds at 52.3 KB/s Receiver Single QR Robust enough Effective File Rate 47 KB/s 48 KB/s native Incoming File 135 KB 25 symbols Frames Received/Red 72/8/8 Block Len 2931 B Frames Received/Red 72/8/8 Block Len 2931 B Payload 365 KB Receiver Capture FPS 56 DROP LOCK DROP 7 ELAPSED 8 s SESSION e775 Payload 365 KB Transfer Complete! - 365 KB in 2.6s (140.42 KB/s) no network Sender Receiver Capture FPS 60 DROP LOCK DROP 7 ELAPSED 1 s SESSION e775 Payload 365 KB Transfer Complete! - 365 KB in 2.6s (140.42 KB/s) no network Meet the Tech Fanatic, Deedy DIM Deedy @deedyda s @MentolVentures, Investor. Anthropic, OpenRouter, Modal, Wispr, Pangram, Inception, Goodfire, PrimeIntellect prior: Glean, Google Search, Cornell CS. San Francisco Joined August 2011 6,159 Following 250.5K Followers Deedy @deedyda s @MentolVentures, Investor. Anthropic, OpenRouter, Modal, Wispr, Pangram, Inception, Goodfire, PrimeIntellect prior: Glean, Google Search, Cornell CS. San Francisco Joined August 2011 6,159 Following 250.5K Followers Follow Subscribe Vibecoded a silly little tool that transfers files from your computer to your phone air-gapped using your camera at ~50 KBps. Nice to have when you're offline or on a plane, or need to send something super duper securely. 9:56 AM Jul 31, 2025 1M Views 9:56 AM Jul 31, 2025 1M Views Sender Camera. Choose a File Browse Files Send File Tune the channel File ID Sender Receiver Receiver Capture FPS 57 DROP LOCK DROP 7 ELAPSED 8 s SESSION e775 Payload 365 KB Transfer Complete! - 365 KB in 2.6s (140.42 KB/s) no network Capture FPS 58.8 DROP 7 ELAPSED 1 s SESSION e775 Payload 365 KB Transfer Complete! - 365 KB in 2.6s (140.42 KB/s) no network Fountain Codes (a) Fountain Source K Source Data Redundancy bucket K PracticallyAI Get 1% Better at AI Every Single Day One 2-minute email, daily: AI stories that matter, actionable tips, a tool worth trying, and a prompt you can steal. Email Subscribe Join 10,500+ professionals & entrepreneurs. 100% free, unsubscribe anytime. THE 1% MATH 37.78x better at AI after 365 days of reading Day 365: 37.78x better. They're still "looking into AI". 1.01^365 = 37.78 - small daily gains compound. THE 1% MATH 37.78x better at AI after 365 days of reading Day 365: 37.78x better. They're still "looking into AI". 1.01^365 = 37.78 - small daily gains compound. THE 1% MATH 37.78x better at AI after 365 days of reading Day 365: 37.78x better. They're still "looking into AI". 1.01^365 = 37.78 - small daily gains compound.