Should I vibe code
Turn tasks into a visual daily timeline with reminders and simple recurring items
The timeline is an evening. A reminder that fires on a locked phone you last opened Tuesday is not.
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Their verdict, the Structured Pro (Monthly) price and the build-time estimate come from their entry, MIT-licensed. Checked 2026-08-04.
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Our verdict, the regret score and everything below it. Editorial and unsponsored — nobody can pay to be moved.
The honest answer
why the verdict is what it is
Of everything on this list, a day planner is among the few where the homemade version can honestly be better, because the entire value is that it matches how you personally think about a day and nobody else has to agree with you. Tasks with durations stacked on a vertical timeline is an evening's work. The parts that are not an evening are the ones no demo shows: recurrence rules that survive a month boundary and a clocks-change weekend, a cascade that pushes the rest of the afternoon down when the 10:00 overruns and knows which items refuse to move, and — the real one — a reminder that arrives on a locked phone at 14:55 whether or not you have opened the app since Tuesday. Structured ships on iPhone, iPad, Mac and Watch for exactly that reason: local notifications, widgets and a complication are the product, and a browser tab cannot deliver any of them. Build it, keep it on your own machine, enjoy the fact that it works the way you think. Just go in knowing that the moment you want it in your pocket you have started a native mobile project, and that is precisely the part the subscription is paying for.
What actually breaks
not "if". the specific failures.
- Nothing that lands on anyone else — this is your own day, on your own device, and that is the whole reason it is a green light
- Recurrence, which is a small calendar library you did not mean to write: "every second Tuesday" across a daylight-saving boundary is where the first real bug lives
- The cascade, when a task overruns and everything after it shifts — including the things that cannot shift, like the meeting other people are also attending
- Reminders, if you build this on the web: no reliable local delivery, no lock screen, no widget, no watch, and a planner you have to go and look at is a list
- Calendar import, the first time a recurring event with exceptions arrives and the parser flattens the exceptions into a repeating ghost
- Timezones, when you plan a day in one and live it in another and every start time is quietly an hour out
- Your own adherence, which is the real failure mode of every planner ever built and the one thing the code cannot fix
Is that you?
the verdict is a default, not a law
- It is yours, on your machine, and nobody else's day depends on it staying up
- You are scratching a specific itch the commercial planners refuse to scratch — a routine model, a particular view, an odd unit of time
- Calendar access stays read-only, so a bug can misdisplay an event but never delete one somebody else is going to
- You need it on the phone with reliable reminders, because that is a native app project rather than a weekend
- It writes back to a shared work calendar, where your recurrence bug becomes somebody else's cancelled meeting
- You are building the planner instead of planning the day, which is the oldest trap in this category
If you build it anyway
the checklist, then the prompt that enforces it
- Keep calendar scopes read-only until you have a concrete reason to widen them. Reading events gives you the entire planner; writing them gives you the ability to delete a colleague's meeting from a cron job.
- Use a real RRULE implementation rather than hand-rolled date arithmetic, and write the tests for the clocks-change weekend before you write the UI.
- Store the plan as plain files — one Markdown or JSON file per day — so an abandoned side project leaves behind a readable record of a year instead of an orphaned database.
- Decide before you build what a task that was never ticked does at midnight: roll forward, expire, or nag. Every planner is really an answer to that question, and deciding it later means deciding it in whichever direction hides the backlog.
- If you want reminders, prove the notification path on a locked device on day one, before any of the fun work. Everything else in this build is achievable; that is the part that decides whether the project is a web page or an app.
- Keep completed items with their timestamps rather than deleting them. The log of what you actually did is more useful than the plan, and it is the thing you will want in six months.
I am building a personal daily planner: tasks with durations laid out on a timeline,
with reminders. It is for me. Take these as constraints rather than suggestions.
1. Do the boring half first. Before any timeline UI, build the data layer: tasks,
durations, a day, and an export that writes each day to a plain file I can read
without the app.
2. Use an established RRULE library for recurrence. Do not hand-roll date arithmetic.
Write tests for a daylight-saving weekend, a month boundary and a leap day before
the feature is considered done.
3. Calendar integration is read-only. Request the narrowest scope that works and tell
me which one you used. Do not implement writing events back unless I ask twice.
4. When you import a calendar, preserve recurrence exceptions rather than expanding
the series into flat instances. A cancelled Tuesday must stay cancelled.
5. Store and compare times as instants with an explicit timezone. Never store a naive
local time and never assume the planning timezone is the living one.
6. If reminders are in scope, build and verify the notification path on a locked
device before anything visual. If we are on the web and cannot deliver a reliable
local notification, say so plainly rather than shipping a bell icon that lies.
7. Overrun behaviour is a decision, not a default. Ask me what happens when a task
runs long: cascade, overlap, or leave it. Mark calendar events as immovable.
8. Keep completed tasks with their real start and end times. The history is the
valuable artefact; the plan is disposable.
9. Single user, local storage, no accounts, no server, no sync. If I ask for sync
later, treat it as a new project with its own conflict rules.
10. Out of scope unless I ask: teams, sharing, analytics dashboards, streaks and any
kind of productivity score.That one keeps you out of trouble. For the prompt that actually builds it, canivibecodeit.com has one.
their build prompt ↗Or don’t build it
the boring option, and the way back out
You want it in your pocket. That is the entire argument, and it is a good one — the App Store subscription runs a few dollars a month (currently $6.99 monthly, $29.99 a year, or $99.99 once for a lifetime unlock) and buys the half of this that is genuinely hard: reliable local notifications, home-screen widgets, a watch complication, and sync across a phone, an iPad and a Mac that somebody else keeps working through OS updates. Your version will be better at matching your head. Theirs will be better at interrupting you, and interrupting you is what a planner is for.
$6.99/mo is cheaper than your weekend.
Write each day out as a Markdown or JSON file as you go, and export tasks as an .ics feed if you ever want them somewhere else. A planner that dies leaving a folder of dated text files has left you a diary; one that dies leaving a SQLite file with no schema documentation has left you nothing. This costs about twenty lines and is the single highest-value thing in the build.
Mature open-source task and project manager with lists, kanban and recurring work.
Open-source todo app built around timeboxing and time tracking, which is most of the day-planner shape already.
Questions
Why is this a ship-it when the calendar entries near it are not?
Because nothing here leaves your machine or reaches anyone else. Sunsama and Morgen are rated on what they connect to — long-lived read-write tokens for Google Calendar, Gmail, Slack, Jira and the rest, held by a hobby process on a VPS you patched once. Strip the integrations and a day planner is a single-user list with times on it. The worst thing a bug can do is ruin your Tuesday, and you can delete the repo on Wednesday.
Can I not just build it as a web app and add a phone later?
You can, and you will discover that the phone is not a port, it is the product. The value of a day planner is that it tells you to stand up at 14:55 without you asking. On the web that means push notifications behind a service worker, no lock-screen presence on iOS worth having, no widget, no watch. Plan for a native build from the start or accept, honestly, that you are building a nice-looking desk planner.
What is the actual hardest part?
Recurrence and the cascade, in that order. "Every second Tuesday except in December" is a real specification and RRULE exists because it is harder than it looks. The cascade is worse because it is a judgement call rendered as an algorithm: when the 10:00 runs twenty minutes over, which of the next six items move, which compress, and which are meetings that cannot move at all? Every planner answers that differently, and the answer is most of the personality of the product.
Every week, someone ships something they shouldn’t have.
New verdicts, the worst thing that landed in the trap, and the occasional incident report. No other email, ever.
Tasks, habits, a timer. Three small features you will actually use because you chose them.
A personal task manager is the app every developer builds. Yours will fit your brain better.
A planner you don't fully trust is worse than no planner, and trust lives in the sync layer, not the UI.
last reviewed 2026-08-05 · verdict is editorial and unsponsored · shared entry data from canivibecodeit under MIT · not legal advice