Date and Time Calculator vs Grabook!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Date and Time Calculator
Calculate the exact number of days, hours, and seconds between any two dates. This tool also allows you to find the date before or after a specified period, making it useful for tracking deadlines, events, or financial products.
- Calculate time between any two dates
- Second-level precision
- Calculate future dates
- Calculate past dates
- Period time calculation
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Want to know how many days you can receive the Christmas gift? Want to know how many days you will have the college entrance exam?Want to know how many days the 158-day wealth management product expired? This tool helps you to calculate the distance between any time, down to second. It can also calculate the day after that day between any time. This tool is not only for wealth management but also for period time. It can tell you the date before or after a certain period.
Grabook!
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Grabook! is a collection book for people who read physical books. Photograph the book in your hands and it becomes a cover sticker you can keep — and every line you read, thought you write down, and page you stop on stays with that book. [ Shoot a book, get a cover sticker ] Place the whole book inside the dashed frame and Grabook cuts it out along the cover edge into an outlined sticker. Book mode frames a rectangular cover; Free mode lifts objects of any shape. Photos from your library work too. Ten sticker edge colors, pick whichever looks right. Confirm the sticker, add a title, author and reading status (Want to Read, Reading, Finished, Paused), and the book is in. [ Tap the words on the page ] Photograph a page and select the sentence you want to keep right on the image, or let OCR read the whole page and edit the result, or just type it in. Excerpts carry their page number automatically — no re-typing. [ Reflections and Cards ] Jot down what came to mind mid-chapter; turn ideas worth remembering into a flashcard — question on the front, answer on the back, one flip away. A reflection can link to an excerpt, or remember where you were reading. [ Timeline: your reading history ] Books, excerpts, reflections and cards lined up in time order — scroll down and it reads like the road you travelled. Filter with #want-to-read, #reading, #finished, #excerpt, #reflection to see just that stretch. [ Sticker canvas and timeline canvas ] One canvas keeps your cover stickers stuck up, the other sorts everything by date; the home look switches with your mood. The camera button in the corner is always ready for the next book. [ Search, tags and bookmarks ] Search by title or author, tag books and filter by tag. Save a bookmark to know exactly how far you got — the page you stopped on shows right above the bookmark. [ Home screen widget ] Keep the book you are reading on your home screen, so every glance reminds you to open it. [ Export to Markdown ] Export a book with its excerpts, reflections and cards into one Markdown file with front matter, ready for Obsidian, Bear or any notes app. [ iCloud Sync ] Turn it on and the books, excerpts, reflections and reading progress merge across your devices; turn it off and Grabook uses only what is already on this device. [ Paper, themes and languages ] Four visual themes — Cream & Indigo, Sunshine Yellow, Ink Brown, Night Reading — with light and dark following the system; canvas paper in blank, dots or grid. Available in English, 简体中文, 日本語, Français, Español and 한국어. About Grabook Pro The free plan saves up to 3 books. Grabook Pro removes the limit and unlocks Markdown export. · Annual subscription: renews automatically through the App Store, cancel anytime in system settings · Lifetime unlock: one purchase, permanent access The subscription renews automatically unless auto-renewal is turned off 24 hours before the end of the current period; payment is charged to your Apple ID at confirmation of purchase. Manage or cancel in system settings. Your data stays with you No account required. With iCloud Sync off, your books, excerpts, reflections and reading progress live only on this device. Privacy Policy: https://www.pollito-function.com/grabook/legal/privacy-policy-zh.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Date and Time Calculator at none against Grabook!'s 2. Date and Time Calculator also leads on update cadence (every 4 weeks vs every 2 months) and iOS requirement (15.0 vs 17.0). Grabook!'s advantage is ads (none vs shown). On price and device support 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. Grabook! sells 2 in-app purchases, starting at $1.99 per year. Date and Time Calculator asks for nothing beyond the download.
Date and Time Calculator ships an update every 4 weeks, Grabook! every 2 months. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.
| Parameter | Date and Time Calculator | Grabook! |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (9.9K ratings) — better | — |
| Positive reviews | 81.0% of reviews | — |
| Number of ratings | 9.9K — better | — |
| Update frequency | Every 4 weeks — better | Every 2 months |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 18 MB | 103 MB |
| Age rating | 4+ | 4+ |
| Developer | 山 钟 | 迪 兰 |
Bugs and requests
Date and Time Calculator
Reported bugs
3 issues- Date/time calculations not always accurate
- Inability to close ads
- Compatibility issues on certain devices
Requested features
4 requests- Option to calculate business days
- Ability to save frequently used dates
- 24-hour time format
- Improved user interface
Grabook!
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Date and Time Calculator
No in-app purchases
Grabook!
- Grabook Pro Annual$1.991 Year
- Grabook Pro Lifetime$2.99
Questions
Is Date and Time Calculator free?
Is Grabook! free?
Do Date and Time Calculator or Grabook! have ads?
Which is updated more often, Date and Time Calculator or Grabook!?
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