I wrote a diary for
twenty years.
Then I couldn't anymore.

I kept a diary for over 20 years. Almost every day, I sat down and wrote about my life. It wasn't discipline — it was just something I did. Like brushing my teeth.

Then, in recent years, I started missing days. One day missed. Then a week. Then I'd look back and realize I hadn't written anything in a month. The habit that had been part of my life for two decades was disappearing, and I could feel it happening but couldn't stop it.

I tried different apps. Different formats. Different routines. Nothing stuck. Writing every day had become a chore. And when something becomes a chore, you stop doing it.

Then I tried speaking instead of writing. And everything changed.

When you speak, you don't worry about grammar. You don't edit yourself. You don't stare at a blank page wondering what to say. You just talk. About your day. About what's on your mind. It flows — naturally, honestly, quickly.

Two minutes of talking captures more than ten minutes of typing. And it feels nothing like a chore.

The problem was: there was no good tool for voice journaling I could trust with my most private thoughts. Every app I found either sent my audio to cloud servers for processing, or charged a subscription, or both.

I'm a developer. So I built my own.

DailyVox is simple at its core: open the app, press record, talk about your day — and SFSpeechRecognizer transcribes everything on-device with requiresOnDeviceRecognition = true. No cloud. No servers. No account. No subscription. Your voice literally never leaves your phone.

AI tools made this possible as a solo developer. What would have taken a team and months a few years ago, I shipped from idea to the App Store in a fraction of the time. That's the power of this moment in technology — one person with the right tools can build something real.

After I started building DailyVox, I realized it could go far beyond just recording voice entries.

If you talk to this app every day — about your thoughts, your decisions, how you react to things, what makes you happy, what frustrates you — it builds a picture. A detailed, honest picture of who you are.

That's when I built the Twin. A multi-dimensional model of communication style, emotional signature, a personal knowledge graph of people and topics, and temporal mood predictions. All derived on-device from NLTagger signals. All serialized as Codable JSON in a single Core Data entity. All yours.

We already leave digital traces everywhere — social media, messages, emails. But all of that is scattered across platforms owned by other companies. None of it is organized. None of it is truly yours.

What if you had one place where you deliberately stored the most honest version of yourself? Not the curated version you put on social media. The real version.

I believe keeping a digital version of yourself will be an important part of the near future. Not science fiction — practical. And DailyVox is built to make that happen.

DailyVox is on iPhone and iPad only. There's no Android version — yet.

That's a deliberate choice. Apple gives me strong security guarantees — the Secure Enclave, the Neural Engine, the privacy frameworks. The whole promise of DailyVox is that your data never leaves your device. I need to be absolutely sure I can keep that promise before putting it on another platform.

I'd rather be on one platform and keep your data safe than be on two platforms and compromise.

Android will come — after iOS is solid, after the user base grows, and after I'm confident the same privacy guarantees can hold.

I'm Karthikeyan. I built DailyVox because I needed it. Turns out other people need it too.

If you have questions, feedback, or just want to say hi —