Second Brain vs Nagi Planner
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Second Brain
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Manage notes, to-dos, and your schedule in one app. Capture thoughts as notes, actions as to-dos, and anything with a date on the calendar. No more hopping between apps. ■ Notes Write fast, organize later. Sort into folders and find anything with search. Share only the notes you choose via a link, and unshare with a single tap. ■ To-Dos Set due dates and repeat rules. See what's left with D-Day countdowns, and group tasks by category. ■ Calendar See to-dos and events on the same screen. Switch between month and week views to check how full your week is. ■ Widgets Check today's tasks from your Home Screen and Lock Screen. See what's left without opening the app. ■ Notifications Get notified as deadlines approach. Start the day with a morning briefing and wrap up with a daily summary. ■ AI Organize Pull action items out of long text. Turn copied text into to-dos. Gather past records into a retrospective. AI features are free up to 3 times per month. To use more, connect your own AI API key. ■ Same content on every device Notes written on iPhone open on the web too. Sign in once and your content follows you across devices. ■ Privacy AI features only process text you explicitly send. See the privacy policy for details. https://docs.ainote.dev/legal/privacy
Nagi Planner
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Nagi Planner is a digital planner for organizing your days and moving forward in your own way. Set your values and personal rules, then break your goals down from 10 years ahead to this week, so that what you do this week connects to the future you truly want. ■ What you can do [Free plan] ・Journal time for reviewing and planning (morning, night, weekend, month-end, every 3 months, year-end) ・Answer journal time questions with the keyboard or by hand ・Schedule (Weekly, Monthly and Yearly; shows, adds and edits events in your iPhone calendar, and can notify you of events) ・To-do list (with dates, times, due dates and repeats) and routines (with a timer) ・Plan time (place to-dos on your day's timeline to plan it) ・Memo (handwriting and photos supported; write with Apple Pencil on iPad) ・Notes (organized in notebooks; templates, checklists, tables and cards, plus handwriting, photos and audio recordings) ・For reading notes, scan a book's barcode to fill in the title, author and cover ・Widgets (today's events, to-dos and routines, and buttons that open a screen; extra large sizes on iPad) ・On Apple Watch, check off and time to-dos and routines ・Part of Insights (how your records change over 1 day, 3 days and 1 week) ・Look back on your journal time [Paid plan] ・Values and personal rules (you can add photos; reviewed in each morning journal time) ・Goals from 10 years ahead down to this week (printable as a single table) ・Projects (in the Schedule, each period shown as a bar, grouped by category, with your calendar events alongside) ・Diary with photos (you can add handwriting too; look back at "today" over the past 10 years) ・A slideshow of your memories, to look back on your favorite photos ・Time-stamped notes, filterable by tag ・To-do and routine logs added to your diary automatically ・Logs for meals, drinks, exercise, medicine and meditation (meditation also works on Apple Watch) ・Plan and actual (compare the plan you made in the morning with the time measured by the timer; shown in night journal time, the diary and the TO-DO log) ・TO-DO log (look back on finished to-dos by date) ・Search in Log (search journal time records, to-dos including their notes, and your diary by text and date) ・Insights (2-week to 1-year periods, choosing dates and periods, and Balance) ・A wish list that brings your future to life (with slideshow) ・A map that colors the places you have been and want to go (with check-ins) ・16 color themes and 20 app icons ■ Your records ・No account required ・Your records are stored only on your device and in your own iCloud ・No ads, analytics or tracking ■ Pricing ・Monthly plan: first 3 days free ・Lifetime plan: buy once and use it forever *See the purchase screen in the app for prices. The monthly plan renews automatically. It renews at the same price unless canceled at least 24 hours before the end of the period. If you cancel at least 24 hours before the free trial ends, you will not be charged. To cancel: open Settings on your device > your name > Subscriptions. Terms of Use (EULA): https://mikiko-app.github.io/nagi/terms.html Privacy Policy: https://mikiko-app.github.io/nagi/privacy.html
Screenshots
Verdict
The clearest difference is in-app purchases: Second Brain at none against Nagi Planner's 2. Nagi Planner's advantage is update cadence (daily vs monthly) and device support (4 vs 2). On price and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Nagi Planner sells 2 in-app purchases, starting at $4.99 per month. Second Brain asks for nothing beyond the download.
Second Brain ships an update monthly, Nagi Planner daily. The most recent releases landed on October 31, 2026 and November 1, 2026 respectively.
| Parameter | Second Brain | Nagi Planner |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | Daily — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 26.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 37 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Dcode | MIKI SHOJI |
In-app purchases
Second Brain
No in-app purchases
Nagi Planner
- すべての機能(月額)3 Days trial$4.991 Month
- すべての機能(買い切り)$79.99








