Comparison

Clerk App vs D

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

Head to head
About

Clerk App

This app is an adaptive study planner designed for medical students. It integrates question banks, flashcards, review materials, and practice exams into a real-time system that adjusts your daily study plan based on your progress and deadlines. It also offers tools for focus, productivity, and community interaction.

Highlights
  • Adaptive daily study planning
  • Unified resource tracking
  • Interactive study calendar
  • Study groups and community
  • Focus and productivity tools
  • Pomodoro timer
Features
Read full description

Clerk is an all-in-one study planner built specifically for medical students who juggle multiple resources, tight timelines, and high-stakes exams. Clerk brings everything together - your question banks, flashcards, content review, practice exams, and focus time - into one adaptive system that updates in real time as you study. Adaptive Daily Study Planning: - Clerk automatically adjusts your daily study requirements based on: - What you’ve already completed - Your target completion dates - Your remaining workload - Fall behind or get ahead? Clerk recalculates instantly so your plan always stays realistic and achievable. Unified Resource Tracking: - Track all of your external study resources in one place, including: - Question banks - Flashcards - Content review - Practice exams See progress at a glance and know exactly what you need to complete each day to stay on track. Interactive Study Calendar: - Plan smarter with a fully interactive calendar that updates automatically as your goals or output change. - Weekly and monthly views - Color-coded study tasks - Instant updates based on progress and deadlines - No more manual rescheduling - Clerk does the math for you. Study Groups & Community: - Stay connected and motivated with built-in study groups: - Private groups to study with friends and classmates - Public groups to discuss topics with medical students around the world - Ask questions, share insights, and learn collaboratively. You control what you share and who you share it with. Focus & Productivity Tools: - Turn intention into results with Clerk’s Focus tab: - Pomodoro timer for structured study sessions - Flip timer to track focus automatically by flipping your phone - Track total focus time and daily productivity - Optionally share study streaks and focus time with your groups for accountability and motivation. Designed for Medical Students: Whether you’re preparing for boards, shelf exams, or daily coursework, Clerk is designed to reduce planning friction so you can focus on what matters most - learning efficiently and consistently. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

D

Organize all your important dates, from exams and anniversaries to birthdays and deadlines. Track upcoming events with customizable countdowns and view them on your home screen or calendar. Stay motivated with progress tracking and enjoy a private, offline experience.

Highlights
  • Unlimited D-day creation
  • Customizable categories
  • Yearly repeating event support
  • Home screen widgets
  • Calendar view
  • Statistics and progress rings
  • Offline and private usage
Features
Read full description

Never miss a day that matters. D-day Counter keeps every countdown in your life — exams, anniversaries, birthdays, deadlines — organized in one clean app. ■ Made for you if… • You're a student counting down to a final exam, certification test, or interview • You want to celebrate your 100th or 1000th day together as a couple • You never want to forget a family member's or friend's birthday — even one kept on the lunar calendar • You're tracking a project deadline, trip departure, or any big day ahead ■ Key features 1. Unlimited D-days Create as many countdowns as you want — no limits. Pick an emoji and add a memo to make each one yours. Count down to upcoming days (D-35) or count up from past events (D+82). 2. Reminders Get notified on the day, or 1, 2, 3, 7 or 30 days before — at the time you choose. 3. Home screen widgets Check your D-days right from your home screen. Pick which D-day each widget shows; with a start date it shows a progress bar too. 4. Yearly repeating events Birthdays and anniversaries roll over automatically every year. Set it once and it always shows the next occurrence. 5. Lunar calendar dates Enter a date on the Korean lunar calendar and it repeats on that lunar date every year, with the solar date worked out for you. Leap months included. 6. Statistics Year progress, what's coming up, your next 100th or 1000th day, goals in progress and a by-month chart — all on one screen. 7. Calendar view See all your D-days laid out on a monthly calendar. Instantly know what's coming up this month. 8. Categories Exam, Anniversary, Birthday, Military and Other — rename them, change their icon and color, or create your own. 9. Progress ring Set a start date and watch the progress ring fill up as you approach your goal. 10. Backup & restore Export your D-days to a file and bring them back on a new phone. ■ Light and private • No sign-up — start using it the moment you install • All data stays on your device (nothing is sent to a server) • Works fully offline • Dark and light themes, English & Korean supported From exam countdowns to couple anniversaries and birthday reminders — start counting the days that matter with D-day Counter.

Screenshots

Clerk App4 screens
D4 screens

Verdict

The call

The clearest difference is in-app purchases: D at none against Clerk App's 3. Clerk App's advantage is ads (none vs shown) and update cadence (every 3 days vs every 2 months). On price, review sentiment, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Clerk App sells 3 in-app purchases, starting at $4.99 per month. D asks for nothing beyond the download.

UpkeepUpdate frequency

Clerk App ships an update every 3 days, D every 2 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

Scorecard4 real differences · 6 level
Clerk App versus D: the parameters behind the verdict, then further details
ParameterClerk AppD
PriceFreeFree
Rating5.0 (20 ratings) — better—
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings20 — better—
Update frequencyEvery 3 days — betterEvery 2 months
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.115.0 — better
Further details — not scored
Size47 MB28 MB
Age rating4+4+
DeveloperRobert ContentoSiU Ahn

Customer experience

Clerk App

All ratings19 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews14 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

D

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Clerk App

Subscriptions2
  • Clerk App Monthly Subscription$4.991 Month
  • Clerk App Yearly Subscription$19.991 Year
One-time1
  • Clerk App Lifetime Plan$29.99
None

D

No in-app purchases

Questions

Is Clerk App free?
Clerk App is free to download, with in-app purchases available.
Is D free?
D is free to download, with no in-app purchases.
Do Clerk App or D have ads?
D shows ads; Clerk App does not.
Which is updated more often, Clerk App or D?
Clerk App ships an update every 3 days, and D every 2 months. Most recently, Clerk App was updated on October 23, 2026 and D on October 24, 2026.

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