Horolog review
A technical, self-hosted scheduler that turns priorities and deadlines into calendar blocks.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Horolog is an open-source AI calendar for people who want their tasks, habits, focus time, and meetings organized around existing commitments. It automatically places work into available calendar time, splits deadline-driven tasks across multiple sessions, and adjusts scheduled blocks when meetings or plans change. Natural-language task capture, P1–P4 priorities, recurring routines, time windows, multi-attendee scheduling, and productivity analytics make it suited to technical users who want planning logic they can run on their own machine.
The strongest fit is its scheduling depth. Horolog combines automatic scheduling with deadline-aware task splitting and priority-based replanning, rather than treating the calendar as a static list of appointments. Habit and routine scheduling adds recurrence and time windows, while productivity analytics covers workload and focus time. Google Calendar and Microsoft Outlook write-back, along with ICS and CalDAV synchronization, support multiple calendar environments. Optional connections include Linear, Todoist, GitHub Issues, Notion, ClickUp, Jira, and Zoom, while Ollama, vLLM, SGLang, and llama.cpp are listed for local model options.
The trade-off is operational scope. Horolog is a self-hosted, single-user service, so it is aimed at people comfortable running software on their own machine rather than buyers seeking a managed calendar product or a shared team workspace. Its web, API, and self-hosted platforms fit technical workflows, but users wanting a conventional hosted experience may prefer an alternative. Choose Horolog for control, open-source access, calendar write-back, and detailed automated planning; choose elsewhere if deployment ownership or team-oriented collaboration is the primary requirement.
Horolog pros and cons
- Where it wins
- Automatically schedules tasks around meetings, habits, and focus time
- Splits deadline-driven work and replans blocks when priorities change
- Supports Google, Outlook, ICS, CalDAV, and natural-language task capture
- Where it doesn't
- Self-hosting places deployment and maintenance responsibility on the user
- Designed as a single-user service rather than a shared team workspace
- Its verified platform options center on web, API, and self-hosting
Horolog fact sheet, pricing and score →
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