Comparison

Task Rainbow vs Core

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

Head to head
About

Task Rainbow

Features
Read full description

Tasks take longer than you expect, and the rest of your day slips. You stay busy, but it is hard to tell where the time went. Get a clearer sense of how long your work takes, so you can plan a day that fits your pace. Task Rainbow helps you compare your estimates with the time you actually spend and use today's experience to plan what comes next. Track time as you work, see it against your estimate in rainbow rings and bars, and review your records when you are done. MAKE ROOM FOR TODAY'S TASKS Organize the tasks you want to work on today and save other tasks for later. Add time estimates to give each task a starting point. KEEP YOUR ESTIMATE IN SIGHT Rainbow rings and bars show elapsed time relative to your estimate. See an estimate of the time remaining while you are within your planned duration. When there is no estimate, or you go over it, the display shows elapsed time. You can keep tracking beyond your estimate. USE TODAY'S RECORDS TO PLAN WHAT COMES NEXT Start, stop, and resume as you work, then mark the task complete. Review your recorded work sessions to see how you used your time and inform your next estimate. MAKE EVERYDAY PLANNING EASIER Group routines into sets and reuse them in your daily plans. Keep familiar steps ready for regular preparation and recurring work. START WITH THE FREE FEATURES Basic planning, time tracking, and records are free. Save up to 5 routine sets, with up to 10 routines in each set. TASK RAINBOW PREMIUM Remove the limits on routine sets and routines per set. Save and share a PDF of your tasks and time records for a selected day. Premium is available as a monthly or annual auto-renewable subscription. Your subscription renews automatically unless canceled. See the in-app purchase screen for pricing and purchase terms. Privacy Policy: https://sites.google.com/view/studio-rainbow-terms/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Core

This writing application is designed for serious Japanese writers, offering vertical text, manuscript management, and AI-powered editing and research. It syncs seamlessly with its Mac counterpart, allowing for on-the-go work with reliable source citation.

Highlights
  • AI editing partner
  • AI research with real sources
  • Vertical and horizontal text layout
  • Export to multiple formats (PDF, DOCX, EPUB)
  • Project management (corkboard, outliner)
  • Syncs with Mac version
  • Quick notes via widget
Features
Read full description

A writing app for people who take Japanese writing seriously, now on iPhone and iPad. Vertical text, your manuscript, and the research, all in one place. Core brings drafting, reference, and revision into one workspace: an AI editing partner that has read your whole project, and reference search that returns only real sources. It opens the same projects as Core for Mac, so you can write at your desk and pick up where you left off on the go. β€” AI Editor β€” the partner that knows your work The AI has read your entire project. Ask it to evaluate an opening, sharpen a piece of dialogue, or test an idea against the rest of the manuscript. Unlike generic AI tools, it answers in the context of what you've actually written. β€” AI Research Agent β€” sources you can trust Ask the AI to find a citation. It searches scholarly databases such as the National Diet Library of Japan and returns only real sources, never fabricated references. β€” A real writing editor β€’ Vertical and horizontal layout β€’ Ruby (furigana), emphasis dots, and upright numbers in vertical text β€’ Word count, 400-character manuscript-page count, and word goals β€’ Add photos and images to your manuscript or notes β€” Export the way you want β€’ PDF with detailed control over page size, margins, and fonts, including spreads for binding and a colophon β€’ Copy in the formats of note, Kakuyomu, and Shosetsuka ni Naro, ready to paste β€’ Word (DOCX), EPUB, and plain text β€’ Preview before you export β€” Project management β€’ Manuscript, notes, and reference material in one project β€’ Corkboard for chapter overview β€’ Outliner for building the plot β€” Quick notes Start a note straight from the app icon or a widget. β€” The same projects as on your Mac Open a project kept in iCloud Drive or another cloud folder on Mac, iPhone, and iPad alike. When changes from two devices overlap, Core takes care not to lose what you wrote. β€” Your work stays with you Manuscripts are saved as files in a place you choose. Your text is never used to train AI models. β€” Who it's for β€” β€’ Japanese-language writers who need vertical typesetting that doesn't fight them β€’ Writers who want to keep going on their Mac manuscript while away from the desk β€’ Anyone who wants AI assistance without losing control of the manuscript β€” Pricing β€” Editing is free. AI features require a subscription. β€’ Pro plan: $7.99 / month, with a 14-day free trial β€’ Max plan: $26.99 / month If you already subscribe on Mac (App Store or direct), sign in with the same account and your plan carries over. β€” Requirements β€” β€’ iOS 17.0 / iPadOS 17.0 or later β€’ Internet connection required for AI features β€” Support β€” Email: contact@corewrite.app Privacy: https://corewrite.app/privacy Terms: https://corewrite.app/terms β€” About the developer β€” Core is built by a single developer who wanted a writing tool worth using session after session. Every feature ships only when it earns its keep in real writing sessions.

Screenshots

Task Rainbow4 screens
Core4 screens

Verdict

The call

Task Rainbow and Core are too close to call on the numbers: across 5 compared parameters β€” price, ads, in-app purchases and device support among them β€” neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Task Rainbow sells 2 in-app purchases, starting at $2.99 per month and Core sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

ScorecardNo meaningful differences
Task Rainbow versus Core: the parameters behind the verdict, then further details
ParameterTask RainbowCore
PriceFreeFree
Positive reviewsβ€”100.0% of reviews
Update frequencyEvery 2 weeksβ€”
AdsNoNo
In-app purchasesYesYes
Monetizationβ€”Freemium
DevicesiPhone, iPadiPhone, iPad, Mac β€” better
Requires iOS18.517.0 β€” better
Further details β€” not scored
Size85 MB11 MB
Age rating4+12+
DeveloperToshiaki NakamuraHukido

In-app purchases

2 purchases

Task Rainbow

Subscriptions2
  • Premium 1 month$2.991 Month
  • Premium 1 year$19.991 Year
2 purchases

Core

Subscriptions2
  • Pro14 Days trial$6.991 Month
  • Max$24.991 Month

Questions

Is Task Rainbow free?
Task Rainbow is free to download, with in-app purchases available.
Is Core free?
Core is free to download, with in-app purchases available.
Do Task Rainbow or Core have ads?
Neither Task Rainbow nor Core shows ads.

Other comparisons