Split — AI Scheduling App

Problem

Productivity apps solve the wrong problem. Most of them are good at capturing tasks and terrible at getting them done. The gap between "I have a list" and "I know exactly what I'm doing at 2pm Tuesday" gets bridged manually, which is itself a significant cognitive load that people either procrastinate on or skip entirely.

The users who feel this most acutely are builders juggling multiple projects and identities: too many commitments to track in their head, too many shifting priorities to maintain a static schedule, and too little time to maintain the productivity system that's supposed to save them time.

Approach

Split's core insight is that auto-scheduling, not better task capture, is what users actually need. The app ingests todos, habits, and calendar events into a unified model, then places them onto the calendar automatically using 8 prioritization frameworks (including Eisenhower, Action Priority, and Value vs. Complexity). Users choose their framework; Split builds the schedule.

The real-time sync layer (Convex) keeps todos, habits, and calendar state consistent across devices without manual refresh. Calendar integrations (Google Calendar, Outlook) are bidirectional. Events from the user's existing calendar are considered when scheduling new items.

The AI Daily Brief generates a prioritized morning summary using Gemini, giving users a single decision on how to orient their day instead of re-triaging a backlog. Message reminders surface check-ins and follow-ups for the relationship maintenance that gets dropped when work gets heavy.

The test suite, 505 tests across Vitest unit/integration and Playwright E2E, reflects a deliberate commitment to shipping without regressions, built adversarially with Codex-generated edge case probes against every new feature before it shipped.

Outcome

Split launched to early access with free web signup (no credit card, setup under 3 minutes). The auto-scheduling system places items onto the calendar in under 30 seconds on a warm session. The v0.1.4 release shipped 5 security fixes identified through adversarial code review, timezone hardening, a DST edge-case fix, and legal pages, with the 505-test baseline maintained throughout.

Technical highlights

• Real-time sync: Convex backend keeps todos, habits, and calendar state consistent across devices
• Auto-scheduling: 8 prioritization frameworks, no manual time-blocking required
• Calendar integrations: Google Calendar and Outlook (bidirectional), Apple Calendar planned
• AI features: Gemini-powered Daily Brief and auto-scheduling suggestions
• Test coverage: 505 tests (Vitest workspace + Playwright E2E), adversarially tested with Codex probes
• Observability: PostHog product analytics + Sentry error tracking from day one