Comparison

Challenge Log vs GridDay

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

Head to head
About

Challenge Log

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Small wins, every day. Challenge Log is a gentle stamp-based app for recording your daily study, work, and habits. [Key Features] New Type x 3-Grade Stamps: Combine 6 types (Face, Hand, Aco, Hanamaru, Star, Flower) with 3 grades (Great, Good, A Little). You'll always find the right stamp for the day. Stamps From Your Photos: Turn a photo from your camera or photo library into a round stamp, give it a name, and use it again and again (sign-in required to create). Photo stamps appear in shared calendars, but are not posted to the community feed. Warm & Cool Themes: Switch between the warm-toned "Warm" and cool-toned "Cool" palettes to match your mood or the season. A Clear 4-Tab Layout: Home / Timer / Community / My Page. Tap any date on the calendar to open the record sheet directly. Inline Monthly Summary: Stamp and timer breakdowns are always visible on the Home screen. Onboarding for First-Timers: A six-page intro tour on first launch. Press a stamp yourself and get a feel for the app right away. Easy Login: Quick sign-in with Google or Apple. No tedious registration required. Record Without Sign-In: Save records locally without an account. Link to an account later to sync to the cloud. Larger Calendar Stamps: Each day's stamp is displayed larger, so your month's progress is easy to see at a glance. Timer Function: Set a time and focus. The screen stays on while running, with a reset confirmation dialog for peace of mind. Reminder Notifications: Set daily, weekly, monthly, or custom-interval reminders. Manage them all from Notification Settings on My Page. Calendar Sharing: Share challenges with friends and cheer each other on. Community: Turn on "Show my records to everyone" in Settings and the records you save from then on appear next to other people's stamps. No name and no date are shown, shared records remain visible until you make them private, and you can report or block anything you would rather not see. A badge on the Community tab lets you know when there's something new, and records you haven't seen are marked "Unread". The Community tab can be turned off in Settings. Cheers: Send a hanamaru, star, thumbs-up or heart to the people you share your calendar with. Share Your Stamp Book: Turn this month's calendar into a single image and share it in square or stories size. Rename Your Stamps: Customize stamp-type names to make them your own. Reorder Your Stamps: Rearrange stamp types from Settings and put your favorites right up front. Profile Setup: Set a username and avatar to personalize your experience. No Goals, No Penalties: No quotas, no deadlines. Focus on just showing up. Daily Memos: Freely jot down notes, insights, or how you feel. App Notices: Timely updates on app news and consistency tips. Cloud Backup: Sign up to save records securely in the cloud. Migration between devices is easy. Multi-language: available in 15 languages โ€” Japanese, English, Korean, Simplified Chinese, Traditional Chinese, German, French, Spanish, Portuguese (Brazil and Portugal), Italian, Dutch, Indonesian, Vietnamese and Thai. [Recommended if you...] - Want to quit being a "quitter" - Want a gentle-looking app you'll actually want to open - Want to build habits with friends - Want a little push from seeing how others are doing - Dislike strict goal management or penalties - Want to try the app first without signing in - Want a theme you can switch by mood Start today โ€” capture your "I did it" days with your favorite stamps.

About

GridDay

Features
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GridDay turns today into a small board of squares. Finish one thing, light up one square. Squares unlock from the centre outwards โ€” you have to finish what is in front before what is behind it opens. So you never face the whole list at once. You only look at the next square. WHY A BOARD, NOT A LIST Lists get longer, and the longer they get the less you want to open them. A board has nine squares. Full is full. It forces you to choose โ€” and choosing is the hard part. UNLOCKS FROM THE CENTRE The first thing you plan to do goes in the middle. Finish it and the four sides open; finish those and the corners open. You don't have to arrange the order yourself: the deadline you set decides which ring an item lands in. IT ASKS WHEN YOU'RE LATE Tap a square after your own deadline and it asks what you were doing during that time. Not to scold you โ€” so the time that slipped away has somewhere to be recorded. After a week you can see which reason you give most often. If you genuinely can't do something today, you can let it go. The square stays on the board rather than pretending it never happened. SIX WAYS OF BEING SPOKEN TO The same facts, told by a different voice: Gentle, Snark, Wuxia storyteller, Cat, Boss, and Mom. Gentle is the free default. Each of the other five can be tried for a day by watching a single ad first. A DIARY THAT WRITES ITSELF Every day leaves behind a small picture of your board: done on time, done late, planned but untouched. After a week you can see what your days actually look like, rather than what you assume they look like. YOUR DATA What you write โ€” your tasks, diary and moods โ€” stays on your device. No account, no cloud sync, and no way for us to see it. FULL VERSION No ads, 4ร—4 and 5ร—5 boards, all tones, planning suggestions, yearly review and data export. A one-time purchase, not a subscription. No countdown timers, no limited-time discounts, no red dots.

Screenshots

Challenge Log4 screens
GridDay4 screens

Verdict

The call

The clearest difference is in-app purchases: Challenge Log at none against GridDay's 2. Challenge Log also leads on iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

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. GridDay sells 2 one-off in-app purchases. Challenge Log asks for nothing beyond the download.

Scorecard2 real differences ยท 4 level
Challenge Log versus GridDay: the parameters behind the verdict, then further details
ParameterChallenge LogGridDay
PriceFreeFree
Update frequencyFortnightlyโ€”
AdsYesYes
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPad, iPod โ€” betteriPhone, iPad
Requires iOS15.0 โ€” better17.0
Further details โ€” not scored
Size91 MB17 MB
Age rating4+4+
DeveloperYOSHIKI KOKUBOGomiigo Games

In-app purchases

None

Challenge Log

No in-app purchases

2 purchases

GridDay

One-time2
  • Tone Pack$4.99
  • Full Version$9.99

Questions

Is Challenge Log free?
Challenge Log is free to download, with no in-app purchases.
Is GridDay free?
GridDay is free to download, with in-app purchases available.
Do Challenge Log or GridDay have ads?
Both Challenge Log and GridDay show ads.

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