Comparison

Kioku vs Prep the day

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

Kioku

Features
Read full description

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.

About

Prep the day

Features
Read full description

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 โ€ข All AI runs on your device using Apple Intelligence. Your text never leaves your iPhone or iPad. โ€ข No account, no sign-in, no servers, no tracking. โ€ข Works without an internet connection. WHY IT WORKS โ€ข A cluttered head makes for a scattered day. Writing it down clears it. โ€ข The AI does the sorting so you don't have to organize before you've even started. โ€ข Five minutes in the morning saves hours of "what was I supposed to do today?" FEATURES โ€ข Brain dump input โ€” type everything on your mind โ€ข On-device AI task extraction, powered by Apple Intelligence โ€ข Noise filtering โ€” trivial, routine items are dropped โ€ข Priority sorting โ€” the list comes back ordered โ€ข Edit freely โ€” add, rename, complete, and delete tasks โ€ข Session history โ€” every morning's prep is saved on-device โ€ข English and Japanese Requires a device that supports Apple Intelligence, with Apple Intelligence turned on. Prep the day. Then go live it.

Screenshots

Kioku4 screens
Prep the day3 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ScorecardNo meaningful differences
Kioku versus Prep the day: the parameters behind the verdict, then further details
ParameterKiokuPrep the day
PriceFreeFree
Update frequencyEvery 2 daysโ€”
AdsNoNo
In-app purchasesNoNo
DevicesiPhoneiPhone, iPad โ€” better
Requires iOS26.026.0
Further details โ€” not scored
Size51 MB2 MB
Age rating4+4+
DeveloperKai KangMikoto Perut

In-app purchases

None

Kioku

No in-app purchases

None

Prep the day

No in-app purchases

Questions

Is Kioku free?
Kioku is free to download, with no in-app purchases.
Is Prep the day free?
Prep the day is free to download, with no in-app purchases.
Do Kioku or Prep the day have ads?
Neither Kioku nor Prep the day shows ads.

Other comparisons