Arnau P

Building 💜 an app for teens with ADHD: plan the day, check in with how you feel, focus. In beta on iPhone & Android.

[Arnau P @arnau_vira]

Vira started as my university final project. Today it's in beta on iPhone and Android, built for teens with ADHD. Here's how it got here 🧵

[Arnau P @arnau_vira]

Day 4 (a day late)

Yesterday's update never went out. Nobody had scheduled it, and I only noticed this morning.

Lesson for building in public: the daily post needs to be queued before the day starts, not written when you remember.

Do you batch your posts or write them same day?

#BuildInPublic

[Arnau P @arnau_vira]

@megsfrompluto fair. solo founder, no team, so AI helps me keep up. but you’re right that it shows, i’ll tone it down

[Arnau P @arnau_vira]

@noahkagan “The send button stays mine” is the right rule. I do the same with my X replies: AI drafts, I press send.

[Arnau P @arnau_vira]

@Bober_smart Haiku for scanning and Opus only for review is a smart split. With a long rules file, does Sonnet keep the rules as well as Opus?

[Arnau P @arnau_vira]

@MistralAI Managed agents plus evals in one place is what most teams end up building by hand. Can the agents run on a schedule, or only on demand?

[Arnau P @arnau_vira]

@WongUpdates AI didn’t remove the work, it moved it to cleanup. Same in software: the agent writes fast, someone still has to check it.

[Arnau P @arnau_vira]

@mark_k @AnthropicAI Taking Claude Code from internal tool to something people use daily is a rare track record. Curious whether Codex starts feeling more like Claude Code in a few months.

[Arnau P @arnau_vira]

@Angaisb_ That’s why I keep the rules in a file the agent rereads, not in the chat. Anything that only lives in the conversation gets lost at some point.

[Arnau P @arnau_vira]

@kapilansh_twt No. I’m not a developer and I’m shipping an iPhone app with Claude Code. What you need is to know exactly what you want, and the patience to check every screen.

[Arnau P @arnau_vira]

Good question, a screenshot only proves the screen. Two more checks: about 886 automated tests run on a Mac before every build, and then I install the build from TestFlight on my own iPhone and use it before it goes to beta testers. The screenshot is the first filter, not the last.

[Arnau P @arnau_vira]

I'm not a developer. My setup: one Claude Code session per feature, each on its own branch. One more session merges them into a single PR. A Mac builds it and sends it to TestFlight. I approve screenshots, never code.

[Arnau P @arnau_vira]

My one rule for building with AI without being a developer: no code until I've seen the screen. In light mode, dark mode and the biggest text size. Otherwise I end up approving things I can't judge.

[Arnau P @arnau_vira]

@akshaj_kasliwal Really useful, thanks. I went from 13 to 18 doing roughly the same, so I’ll space mine out too. Did the more specific replies bring follow-backs, or mostly conversations?

[Arnau P @arnau_vira]

Day 2

X followers: 13
Replies I wrote today: 20+

Best thing I learned: a founder who went from 0 to 500 followers in 18 days did it with about 70 replies a day. I'm at 20. Going up.

Vira, my app for ADHD, is in beta on iPhone and Android.

How many replies a day do you write?

#BuildInPublic

[Arnau P @arnau_vira]

@aksenHQ Too early to tell. The first one with real screens goes out today. With 18 followers it’s a tiny sample, but I’ll share the numbers in a Day post either way.

[Arnau P @arnau_vira]

Day 3

X followers: 18 (+5)

Today I redid four post images. The old ones were a headline on a flat color, easy to scroll past. The new ones use real screens from Vira, my ADHD app.

Real screenshots or polished mockups: which makes you stop?

#BuildInPublic

[Arnau P @arnau_vira]

@AzrianoY1 Good call. Behaviour is covered by tests first: around 850 run on every merge. Past that, testers and I catch things by using the app every day. Purchases aren’t in the beta yet, so a written TestFlight checklist is next on my list.

[Arnau P @arnau_vira]

@ClaudioSonnet The tests. Around 850 of them run on every merge before the Mac builds anything, and if one fails, it doesn’t ship. Screenshots cover what tests can’t judge: whether it looks and feels right.

[Arnau P @arnau_vira]

@suraj_sharma14 Number 3. I’m a non-dev with an app in beta, and building was the easy part. Where the first users hang out is the question that actually keeps me up.

[Arnau P @arnau_vira]

@MusawirRaji A founder crediting the builder publicly says a lot about her. Congrats on the CTO seat.

[Arnau P @arnau_vira]

@RoundtableSpace 50 product videos from 50 photos is the line that sells it. How much editing do they still need before they’re usable?

[Arnau P @arnau_vira]

@vikktorrrre Two big models in one week means my rules file gets tested twice. For a non-dev, the upgrade that matters is following instructions, not benchmarks.