Sunset City: The Dark Tower
Sunset City
Free browser voxel parkour in a golden-hour port city: climb rooftops, vault alleys, ride ziplines, and sneak or fight toward the Dark Tower.
Francesco
Di Donato
I'm Francesco Di Donato, a senior fullstack engineer who writes, ships tools, and keeps a small corner of the web for the work that matters.
I build web systems, native utilities, tools, and writing from the same habit: make the useful thing clear, then remove the rest.
Base Italy / remote
Mode Fullstack systems
Material Writing / tools / products
Style Swiss poster archive
The product with its own gravity
Local Mac video editing: captions, silence removal, portrait crops.
Open Velocaption- Status
- Released
- Type
- mac-app
- Surface
- macOS app
- Proof
- Real interface
02 / Archive
Projects.
01
LinkPreview AI
Open Graph previews, metadata parsing, and link cards treated as infrastructure.
- Type
- web-app
- Status
- Released
Speech Studio AI
Speech tooling parked until the native workflow earns a sharper reason to exist.
- Type
- mac-app
- Status
- Coming Soon
EasyPageGo
A website builder that was too clever for its own good.
- Type
- Web App
- Status
- Lessons Learned
ISEMAILOK
An email validation API that nobody asked for.
- Type
- API Service
- Status
- Lessons Learned
01 
Sparse Attention Guide: What Should an LLM Ignore?
didof.dev 02 Sparse attention cuts full attention's n^2 graph, but every missing edge changes what an LLM can remember, route, cache, and safely ignore in long contexts.
Auto Captions Without Uploading Video: Mac Guide
Velocaption 03 Create auto captions without uploading video. Whisper trained on 680,000 hours of audio, and Velocaption runs it locally on Mac for private caption edits.
Face-Aware Portrait Crop for Vertical Video
Velocaption 04 Crop landscape video to 9:16 without losing the speaker. Learn 4 face-aware framing rules for portrait exports, Reels, TikTok, and Shorts with Mac tools.
Remove Silence from Video Automatically: Guide
Velocaption 05 Remove silence from video with 3 key settings: threshold, duration, and padding. Learn a cleaner workflow for tighter cuts without clipping spoken words.
SRT vs VTT: Which Subtitle Format Should You Use?
Velocaption 06 SRT is simple and widely accepted. VTT works with HTML5 video tracks and cue styling. Compare 2 subtitle formats and export the right file for each platform.
The Brain May Have Spoken a Dead Language. DMT Is Trying to Translate It.
didof.dev Andrew Gallimore's 2013 paper proposes DMT is not another psychedelic but an endogenous neuromodulator that once built parallel brain connectivities. What happens when the brain switches languages.
didof.dev
Velocaption
LinkPreview
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04 
05 
06 
07 
Free Carousel Editor
Design pro-grade Instagram and LinkedIn carousels in your browser. 16 templates, 4 packs, 12 themes, brand kit, PDF + PNG export. 100% free, zero sign-up.
WhatsApp Link Generator
Create a custom WhatsApp 'Click to Chat' wa.me link and QR code instantly. Pre-fill your message, copy the HTML snippet, and connect with customers for free.
Background Remover
Remove the background from any image instantly for free. Powered by AI, runs entirely in your browser — no uploads, no accounts, no watermarks.
Emergency (ICE) QR Code
Generate a secure, offline medical ID for your helmet, wallet, or keychain. Vital info for first responders, zero data stored on servers.
Luggage & Property Tag
Protect your bags without broadcasting your home address. Generate a secure 'If Found' QR code that works offline in airports anywhere.
Image to Offline QR Codes
Turn any photo into a sequence of secure, scannable QR codes. Share images across air-gapped devices without WiFi, Bluetooth, or the cloud.
Digital Business Card (vCard)
Generate a professional, privacy-first QR business card. No monthly fees, no tracking. Scans directly to phone contacts.
05 / Routes Notes from
Notes from
the
workshop.
A few places where I publish, test ideas, and keep the conversation going.
01 Newsletter The High-Signal Dev
Curated tech findings and dev explorations. Zero fluff.
02 Latest writing Sparse Attention Guide: What Should an LLM Ignore?Sparse attention cuts full attention's n^2 graph, but every missing edge changes what an LLM can remember, route, cache, and safely ignore in long contexts.
03 Code GitHubSource, experiments, and public workbench material.
04 Product VelocaptionLocal Mac video editing: captions, silence removal, portrait crops.