Comparison

PaperDue vs Time Zone Difference Planner

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

Head to head
About

PaperDue

Never miss a crucial submission deadline for AI research conferences. This app provides live countdowns, smart notifications, and conference rankings to help academics stay organized and focused on their work.

Highlights
  • Live countdown tracker for hundreds of conferences
  • Smart reminder notifications
  • CORE & CCF conference rankings
  • Dynamic Island countdown ticker
  • Home & Lock Screen widgets
  • Timeline & calendar view
  • Multi-timezone support
Features
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PAPERDUE — NEVER MISS A SUBMISSION DEADLINE Your next breakthrough paper deserves a shot. Don't let it miss the deadline. PaperDue is the essential deadline tracker built for AI researchers, PhD students, and academics who live and breathe conference submissions. Track CVPR, NeurIPS, ICML, ICLR, ACL, AAAI, ECCV, and hundreds more — all in one beautiful, distraction-free app. ———————————————————— WHY RESEARCHERS CHOOSE PAPERDUE ———————————————————— Conference season is brutal. You're juggling abstract deadlines, full-paper windows, rebuttal periods, and camera-ready dates — across dozens of venues simultaneously. Missing a deadline doesn't just mean disappointment; it means waiting another year. PaperDue keeps every critical date front and center, so you can focus on the science. —————— FEATURES —————— - LIVE COUNTDOWN TRACKER — Browse hundreds of AI, CV, NLP, and ML conferences sorted by urgency. Real-time day countdowns, second-precise timers for your followed venues. - SMART NOTIFICATIONS — Custom reminder alerts at 14, 7, 3 days or the day of — configured independently for abstract and full-paper deadlines. - CORE & CCF RANKINGS — Every conference tagged with its CORE (A*, A, B, C) and CCF (A, B, C) ranking. Filter instantly to surface only the venues that match your impact target. - DYNAMIC ISLAND COUNTDOWN — When a deadline enters the final 24 hours, a live ticker activates in the Dynamic Island. The most urgent alert on your phone. - HOME & LOCK SCREEN WIDGETS — Glance at your next deadline without opening the app. Multiple sizes with live countdown bars. - TIMELINE & CALENDAR — Visualize your full submission roadmap in a scrollable timeline or monthly calendar, with one-tap export to Apple Calendar. - MULTI-TIMEZONE SUPPORT — Local time, UTC, AoE, or any fixed offset. Essential for international submissions. ———————————— DESIGNED FOR FOCUS ———————————— No clutter. No social feed. No noise. The dark navy interface keeps your eyes comfortable during late-night writing sessions. —————————————— YOUR COMPETITIVE EDGE —————————————— The researchers who get accepted aren't always the ones with the best ideas — they're the ones who submitted on time, without the last-minute panic. Download free. Upgrade when you're ready.

About

Time Zone Difference Planner

Features
Read full description

PREMIUM — PURCHASE REQUIRED: All features described below are part of Pro and require a purchase: a weekly or yearly auto-renewing subscription, or a one-time lifetime purchase. Stop doing time zone math before every call. TimezoneWorld lays your whole team on one 24-hour band, colors the hours when everyone is actually at their desk, and ranks the best meeting windows for you — so "does 9 AM my time work for Sydney?" is answered the moment you open the app. Most world clocks show you a row of times and leave the hard part to you. TimezoneWorld starts where they stop: you set each city's working hours, and its overlap engine walks the real calendar — daylight saving shifts, half-hour zones like India, even quarter-hour zones like Kathmandu — to find the hours when every city is inside its working day. Tap any hour on the band and see exactly what the clock reads in every city, and on which date. WHAT YOU GET • A 24-hour overlap band in your own local time — gold hours mean everyone is at their desk; tap one for the exact local time and day in every city • Best meeting windows ranked by length, so the longest shared stretch is always suggestion number one • Live clocks for up to 8 cities with an at-their-desk indicator, chosen from 400+ searchable time zones • Working hours per zone — set Berlin to 8–16 and Sydney to 10–18 and the overlap recalculates instantly • A daily reminder the moment your team's shared window opens, so you catch everyone while they are online • One-tap sharing that writes the proposed meeting out in every invitee's own local time and date PERFECT FOR • Remote teams spread across continents who lose the first ten minutes of every week to scheduling • Freelancers and agencies booking calls with the US, Europe, and Asia in the same week • Long-distance families and couples who want to ring while everyone is actually awake • Travelers who need home time, destination time, and the difference between them at a glance WHY NOT JUST USE A WORLD CLOCK? A world clock tells you it is 3 AM in Tokyo. It does not tell you when Tokyo, Berlin, and Chicago are all working at the same time — that is a search across 24 hours and every zone's own working day, with daylight saving moving the goalposts twice a year. TimezoneWorld runs that search for you and simply shows the answer. PRIVATE BY DEFAULT Everything is computed on your iPhone from the system's own time zone database. No account, no sign-in, no tracking — and the app works fully offline. PREMIUM (PURCHASE REQUIRED) TimezoneWorld is unlocked by a single purchase of your choice: a Weekly subscription, a Yearly subscription, or a one-time Lifetime purchase. Full access includes all 8 zone slots, the 24-hour overlap band, ranked meeting windows, per-zone working hours, the daily overlap reminder, and meeting-time sharing. Add your cities, set the working hours, and let your next "when works for you?" answer itself. Terms of Use: https://leanstudio.asia/terms-of-use Privacy Policy: https://leanstudio.asia/privacy-policy Support: support@leanstudio.asia

Screenshots

PaperDue4 screens
Time Zone Difference Planner4 screens

Verdict

The call

The clearest difference is update cadence: PaperDue at weekly against Time Zone Difference Planner's every 4 months. On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. PaperDue sells 1 one-off in-app purchase and Time Zone Difference Planner sells 3 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

PaperDue ships an update weekly, Time Zone Difference Planner every 4 months. Both last shipped on October 31, 2026.

Scorecard1 real difference · 8 level
PaperDue versus Time Zone Difference Planner: the parameters behind the verdict, then further details
ParameterPaperDueTime Zone Difference Planner
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyWeekly — betterEvery 4 months
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhone, iPad — betteriPhone
Requires iOS18.617.0 — better
Further details — not scored
Size3 MB5 MB
Age rating4+4+
Developer梓豪 朱LEAN ASIA CO., LTD

In-app purchases

1 purchases

PaperDue

One-time1
  • PaperDue Pro$1.99
3 purchases

Time Zone Difference Planner

Subscriptions2
  • World Clock Weekly$2.997 Days
  • Remote Work Yearly$14.991 Year
One-time1
  • UTC Converter Lifetime$29.99

Questions

Is PaperDue free?
PaperDue is free to download, with in-app purchases available.
Is Time Zone Difference Planner free?
Time Zone Difference Planner is free to download, with in-app purchases available.
Do PaperDue or Time Zone Difference Planner have ads?
Neither PaperDue nor Time Zone Difference Planner shows ads.
Which is updated more often, PaperDue or Time Zone Difference Planner?
PaperDue ships an update weekly, and Time Zone Difference Planner every 4 months. Most recently, PaperDue was updated on October 31, 2026 and Time Zone Difference Planner on October 31, 2026.

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