FOMO Sun
Build in public
Product notes, release updates, and architecture decisions behind fomosun.com.
28 Feb 2026 · Published
v1.0.6 shipped: curated stamps + analytics
We shipped v1.0.6 with a focused release package: new curated stamp assets, analytics instrumentation, and production cleanup.
28 Feb 2026 · Published
OJP token auth is now live
We switched FOMO Sun transit calls to support bearer token authentication for OJP/OpenTransportData-compatible endpoints.
21 Feb 2026 · 690 words · Published
Day 8: St. Moritz stamp evolution (v101 → 1.0.4)
St. Moritz became our most iterated stamp in this release window. This post now shows real screenshot snapshots for each phase and explai...
21 Feb 2026 · 450 words · Ready to Publish
Day 8: Why FOMO Sun is now 1.0.1
We just crossed v100, and that milestone triggered a versioning decision.
21 Feb 2026 · 420 words · Ready to Publish
Day 8: We hit 100 versions in 8 days
We crossed the line: 100 shipped versions in 8 days.
21 Feb 2026 · 520 words · Ready to Publish
Day 8: Inside the V101 stamp redesign
V101 focused on one thing: the destination stamps needed to feel closer to real Swiss vintage tourism posters.
21 Feb 2026 · Ready to Publish
Day 8: The Final Sprint to 100
94 versions shipped. 6 to go. Less than 24 hours left to hit 100 versions in 8 days.
20 Feb 2026 · Ready to Publish
Day 7: When Antigravity Took the Wheel
After 6 straight days of Claude + Codex relay sprints, I did something different: I handed the entire codebase to Antigravity (Google Dee...
18 Feb 2026 · Ready to Publish
Building with Two AIs: How Claude and Codex Ship Together
Most people use one AI. We use two. Here's why, and how it works.
18 Feb 2026 · Ready to Publish
Why 'Travel Joystick™' Could Define the Next Generation of Travel Apps
We filed for a trademark on "Travel Joystick™" today. Not because we're patent trolls. Because we think we've discovered a fundamental in...
18 Feb 2026 · Ready to Publish
89 Versions in 7 Days: How We Built FOMO Sun
Most startups talk about their launch day. We're going to talk about all 89 versions that came before it.
17 Feb 2026 · 430 words · Ready to Publish
Voice-only ship test: deployed from the couch in 6:25
I wanted to test a new workflow today: ship a real production hotfix to FOMO Sun using voice only.
17 Feb 2026 · 800 words · Published
Day 5: 75 versions, forecast trust, and building for agents
75 versions in 4 days. That number sounds absurd, and it is. But each one taught us something. Today's lesson: your data is only as good ...
16 Feb 2026 · 1150 words · Ready to Publish
Day 4: Vintage stamps, joystick physics, and why your travel app needs a soul
This is part of the FOMO Sun build-in-public series. The app is live at fomosun.com.
16 Feb 2026 · 1400 words · Ready to Publish
Day 3: 57 versions, a joystick, and the lesson every AI builder learns the hard way
We hit version 57 today. Three days. Two AI agents. One Notion workspace. 294 destinations across Switzerland, Germany, and France.
16 Feb 2026 · 500 words · Ready to Publish
How I made an app that LLMs can use: GEO for FOMO Sun
The thesis
15 Feb 2026 · 800 words · Ready to Publish
5 fog escapes within 2 hours of Basel that actually work
The problem everyone on the Swiss Plateau knows
15 Feb 2026 · 650 words · Ready to Publish
The weekend builder's playbook: shipping FOMO Sun in stolen hours
The reality of building a side project in 2026
15 Feb 2026 · 900 words · Ready to Publish
Live development log -- every version, every decision
This is the living development log for FOMO Sun. Every version shipped, every decision made, updated in real time as we build.
15 Feb 2026 · 850 words · Draft
Day 2: Two AIs, one codebase -- how Claude and GPT built FOMO Sun together
Yesterday we shipped 8 versions of FOMO Sun in a single day. Today the question changed: can two different AI agents collaborate on the s...
15 Feb 2026 · 700 words · Ready to Publish
The architecture behind a weekend MVP: FOMO Sun tech stack
TL;DR
14 Feb 2026 · 760 words · Ready to Publish
From V1 to V6: Turning FOMO Sun into a real decision tool
Today I audited every shipped snapshot of FOMO Sun and wrote down what actually changed between versions, based on code diffs instead of ...
14 Feb 2026 · 550 words · Ready to Publish
Day 1: From zero to working API in 8 hours
What I shipped today
14 Feb 2026 · 450 words · Ready to Publish
Day 0: Why I'm building a fog-escape app in one weekend
The hook