TL;DR : After 60 days of running an indie iOS dev experiment, here's the literal template you can fork to run your own 100-day experiment. Phases, decision tree, public artifacts. Works for any indie product (SaaS / iOS app / Gumroad SKU / B2B service). Why 100 days Not 30 days (too short for compounding signal). Not 365 days (too long for early-stage tight feedback). Not 90 days (slightly too short for distribution channel maturation). 100 days is the sweet spot for cold-start indie experiments: Long enough for ~10 product/content iterations Short enough to keep urgency Long enough for at least 1 algorithmic breakthrough on dev.to / Substack Long enough for 2-3 cycles of customer feedback The template (5 phases × 20 days each) Phase 1 (Day 1-20): Setup + first ship [ ] Day 1-3: Pick ONE product. Specific niche, not "for everyone". [ ] Day 4-7: Set up infrastructure (GitHub repo, domain, lead capture, payment) [ ] Day 8-14: Build MVP. Ship publicly even if rough.…