Kioku vs Prep the day
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Kioku
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Kioku is a personal knowledge library for Mac. Save articles, PDFs, websites, and your own Markdown notes into organized vaults you can read, search, annotate, and keep with you offline. Use Kioku to turn scattered research into a calm, durable library. Paste a URL to archive a single page, save a PDF from your Mac, or crawl more of a site when you want a deeper reference vault. Kioku stores your content as Markdown with downloaded assets, so your library stays portable and readable outside the app. Write your own notes with a focused Markdown editor, add images, create internal links, and keep authored notes separate from saved web pages. While reading, select passages to save excerpts and notes so important ideas do not disappear after the first pass. Kioku also includes optional local AI features for summaries, retrieval, chat, and study cards. Supported models run on your Mac, keeping those experiences local to your device. Features: Save articles, PDFs, pages, and websites into Markdown vaults Read saved content offline in a native Mac interface Write and edit Markdown notes Organize saved pages into vaults Search your library Annotate passages and save excerpts Generate summaries with optional on-device AI Create study cards from saved pages and notes Store content in a local or iCloud Drive-backed folder Keep your library portable with Markdown files and assets Kioku is for readers, researchers, students, builders, and anyone who wants a quieter place to collect what matters.
Prep the day
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Prep the Day is a morning ritual for getting your day in order. Every morning, open the app and type out everything you need to do today โ fast, messy, stream of consciousness. Don't think about order or priority. Just get it out of your head. Then the on-device AI takes over. It reads your dump, pulls out the real tasks, drops the routine "noise," and hands back a clean, prioritized list for the day. One brain dump in, one focused task list out โ every morning. ON-DEVICE & PRIVATE โข All AI runs on your device using Apple Intelligence. Your text never leaves your iPhone or iPad. โข No account, no sign-in, no servers, no tracking. โข Works without an internet connection. WHY IT WORKS โข A cluttered head makes for a scattered day. Writing it down clears it. โข The AI does the sorting so you don't have to organize before you've even started. โข Five minutes in the morning saves hours of "what was I supposed to do today?" FEATURES โข Brain dump input โ type everything on your mind โข On-device AI task extraction, powered by Apple Intelligence โข Noise filtering โ trivial, routine items are dropped โข Priority sorting โ the list comes back ordered โข Edit freely โ add, rename, complete, and delete tasks โข Session history โ every morning's prep is saved on-device โข English and Japanese Requires a device that supports Apple Intelligence, with Apple Intelligence turned on. Prep the day. Then go live it.
Screenshots
Verdict
Kioku and Prep the day are too close to call on the numbers: across 5 compared parameters โ price, ads, in-app purchases and device support among them โ neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Kioku | Prep the day |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days | โ |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone, iPad โ better |
| Requires iOS | 26.0 | 26.0 |
| Further details โ not scored | ||
| Size | 51 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Kai Kang | Mikoto Perut |
In-app purchases
Kioku
No in-app purchases
Prep the day
No in-app purchases









