Can I vibecode Amazing Marvin?

YES · one-shottable
price $8/moyou'd save $96/yrbuild time one sittingcategory ✅ tasksreplaced by 0 people

The core loop is small enough for a capable coding agent to produce a useful local version in one sitting. For Amazing Marvin, build a configurable personal task system from strategies, views, timers, and reviews. The hard boundary is very deep strategy library, cross-platform sync, and years of workflow experimentation, plus cross-device reliability and workflow polish.

the prompt
Build a personal replacement for Amazing Marvin in an empty repository.
Use Tauri 2, React, TypeScript, SQLite, and desktop notifications; do not offer alternative stacks.
The core loop is: capture tasks, schedule or repeat them using configurable strategies, views, timers, and reviews, work from a focused today view, and keep history locally.
Make the first run work locally with one documented command.
Store all user data locally by default and make export straightforward.
Put secrets in .env, ship .env.example, and never commit credentials.
Create inbox, today, upcoming, someday, and completed views with fast keyboard capture.
Support projects, tags, due dates, start dates, priorities, notes, subtasks, and attachments.
Implement robust daily, weekly, monthly, and custom recurring rules with tests.
Add a focus view with one active task, timer, and optional desktop notification.
Provide search, saved filters, undo, and a completed-task archive.
Export and import a documented JSON format and make automatic local backups.
Include clear empty, loading, success, and recoverable error states.
Add input validation, safe filenames, and graceful handling of unavailable APIs.
Write focused tests for the core transformation and one end-to-end happy path.
Create a README with setup, architecture, permissions, data location, and backup steps.
Do not add accounts, billing, telemetry, analytics, or a hosted control plane.
Deliberately leave out team assignment and comments.
Deliberately leave out two-way calendar or email synchronization.
Deliberately leave out native mobile apps and cloud accounts.
Finish by running the tests and listing the exact commands used.

$ open in your agent (prompt prefilled, you press enter) or copy it raw · this prompt is generated from the build plan · improve it via PR

why people still pay

People still pay for Amazing Marvin because task software is sticky because trust, speed, and ubiquitous capture matter more than the database schema. The recurring cost buys recurrence edge cases, notifications, sync conflicts, calendar APIs, mobile capture, and backups, not just the visible interface.

what you lose

xvery deep strategy library, cross-platform sync, and years of workflow experimentation

xperfect mobile sync

xcalendar and email integrations

xshared workspaces

xbehavioral coaching polish

share on X ↗"I just replaced Amazing Marvin ($8/mo) with one prompt"
the escape hatch

Don't feel like building it? These folks already made it free.

Super ProductivityA local task manager with timeboxing, Pomodoro, and no account begging to be created21kaug 2026open sourceLunataskTasks, seven habits, a daily calendar, and Pomodoro for free; external calendar sync is the upsell$0free

no votes, no pay-to-list · just what's real

the numbers

Amazing Marvin pricing

planmonthlyannual (per mo)what you get
marvin pro$8/user1 user; 100+ features; unlimited tasks and projects.

free tierno free tier

billingmonthly + annual (-33% advertised); exact monthly dollar amount not independently exposed

verified 2026-08-14 · source ↗

questions
Can I vibecode Amazing Marvin?

Yes. A competent AI coding agent (Claude Code, Codex, Cursor) can build a usable personal Amazing Marvin replacement in one session with the prompt on this page. It runs on your own machine or server with no subscription.

How much does Amazing Marvin cost?

Amazing Marvin costs about $8/month (Marvin Pro, checked 2026-08-14), which is $96 per year. That's what you save by replacing it with one prompt.

What do I lose by replacing Amazing Marvin?

Honestly: very deep strategy library, cross-platform sync, and years of workflow experimentation; perfect mobile sync; calendar and email integrations; shared workspaces; behavioral coaching polish. If any of those are load-bearing for you, keep paying.

Is there an open-source alternative to Amazing Marvin?

Yes: Super Productivity (A local task manager with timeboxing, Pomodoro, and no account begging to be created) Lunatask (Tasks, seven habits, a daily calendar, and Pomodoro for free; external calendar sync is the upsell) The prompt is for when you want it exactly your way.

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