My Solo App Journey: From ECharts to a $10k/Month Business

AI Summary · From the Perspective of a Serial Entrepreneur (The following content is distilled by AI; viewpoints belong to the original author; you may skip the original article after reading this)

Bilibili creator Xianzhe (former core developer of ECharts) shares his four-year indie dev journey. From a failed mood diary app to iterative releases like Typeface Calendar and Alien Focus, he recounts hands-on pitfalls in the transition from side hustle to full-time indie development.

• Side-hustle entry point: emotion/efficiency tools are ideal for a solo programmer starting out…
• Product iteration: Typeface Calendar and Alien Focus broke through via visual differentiation (animations/design)…
• Cold-start validation: Build first for yourself (a note-taking app), validate demand, then expand…
• Key inflection point: Once side income reliably covered living costs…
• Pitfall to avoid: Don't chase monetization early—ship an MVP to test user demand first.

1. What Kind of Opportunity Is This?

The core audience is individual users seeking emotional relief or productivity gains. The main pain point it addresses is the severe homogenization and flat experience of tool apps. Monetization comes through a one-time purchase on iOS, building a moat via visual differentiation (animations, design) while rejecting ads and subscription traps.

2. Independent Assessment

Worth doing, but the barrier is "aesthetic sense," not "technical skill." The source material confirms that while the former ECharts core developer backing caps the technical ceiling, the hit app Alien Focus succeeded on animation polish rather than code complexity. From an editor's perspective, a solo developer who can't deliver visually striking UI/UX will quickly get swallowed by the red ocean; distinctive visuals are the lever for low-cost user acquisition.

3. Cold-Start Path

Step one: build a tool you'd actually use yourself (e.g., a note-taking app), validate your own genuine need, then branch outward. Upfront costs are minimal—mostly time plus the Apple Developer Program fee. Timeline-wise, expect one to two months from kickoff to App Store launch to refine the MVP; the first three months should focus on establishing visual recognizability, not revenue.

4. Biggest Risks and Pitfalls

The fatal trap: premature monetization and feature bloat. Early on, Toothlaugh Mood Diary stalled because no business model was defined. The fix: ship an MVP to validate retention before discussing monetization; avoid "all-in-one" scope and zero in on a single scenario (focus, journaling). Another pitfall is ignoring the domestic Android ecosystem—current evidence shows the bulk of revenue comes from iOS; if you plan to rely on Android, reassess the development investment.

5. Case Review (How Others Did It)

• A rough start: In 2017 he built Toothlaugh Mood Diary to track his own emotions, but without a commercial path or promotion strategy the project stayed in a self-indulgent loop, never building a growth flywheel.
• Visual breakthrough: In 2021 he shipped Typeface Calendar, dropping conventional feature stacking and making "typeface display" the core selling point. Custom font rendering and interaction details created cognitive differentiation at the App Store screenshot stage, acquiring early seed users at low cost.
• Hit logic: Alien Focus went viral not because it had the most features, but because of a single "planet orbit" animation. He deliberately polished the animation curves and lighting effects, then amplified that visual highlight across Bilibili and Xiaohongshu to break out. Data shows visual wow-factor became the primary driver of both paid conversion and organic sharing.
• Self-use driven: When building Mountain View Notes, he insisted on "solving my own pain points first." He refined the experience around high-frequency scenarios like organizing books and highlighting passages, confirming sticky utility for vertical tool apps.
• Inflection signal: The decision to quit was grounded in financial security—he went full-time only after side income consistently covered living costs by a comfortable multiple. Until then he kept his day-job cash flow and iterated on products in evenings and weekends, lowering trial-and-error costs.

6. Dual-Track Feasibility

Cross-border: viable. Visual tool apps are naturally suited to global expansion—you can ship on iOS overseas without localized copy, reusing Figma/After Effects assets and launching with a "Calm/Visual" positioning for North America. Domestic China: viable but cutthroat. You need to lean on communities like Bilibili and Xiaohongshu, showcasing gorgeous UI details to capture long-tail traffic, while sidestepping head-on competition with big-tech tools on feature-release speed.

Original · Anyway.FM Design Chat: Read original →