Building Proofed in public
I'm Lucas — a backend dev building an offline grammar checker for iPhone. No cloud, no accounts, just Apple's on-device AI. This is where I document the process: technical decisions, mistakes, and everything in between.
What to Do After You Cancel Grammarly (Best iPhone Alternatives in 2026)
You have decided Grammarly is not worth $30 a month. Fair. Here is how to cancel it and what to actually use instead on your iPhone.
Grammar Checker for Lawyers: The One Tool That Does Not See Your Documents
Most grammar tools send your text to a server before returning suggestions. For lawyers, that is a problem. Here is what your options actually are.
Apple Intelligence vs Grammarly: What iPhone Writers Should Actually Use in 2026
Apple Intelligence is built into iOS now. Grammarly has been around for years. Here is an honest look at what each one actually does, who each one is for, and where both fall short.
Is Grammarly Safe for Confidential Documents? What Actually Happens to Your Text
Grammarly says they don't sell your data. That's true. But your text still leaves your device every time you paste it in. Here's what that actually means.
How to Check Grammar on iPhone Without an Internet Connection (2026 Guide)
A practical guide to offline grammar checking on iPhone — what iOS gives you natively, what it can't do, and how to get real grammar analysis without WiFi.
How Apple Foundation Models actually work for grammar checking
I dug into the Foundation Models framework to figure out what it can and can't do for a grammar app. Here's what I found.
The Best Private Grammar Checkers in 2026: No Cloud, No Account Required
A honest look at grammar tools that don't send your text to a server. What actually works, what's developer-only, and what to use on iPhone.
Day 0: Why I'm building an offline grammar checker
I pasted a sensitive email into Grammarly and then immediately felt sick about it. That's why I'm building Proofed.