Comparison

zero vs Countdown Pro

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

Head to head
About

zero

Features
Read full description

Anxious about climate change? Want to take action to manage your climate impact? Talk to zero. zero is an AI agent built to help you understand, reduce, and offset your climate impact. By estimating the carbon emissions associated with your activities and providing an extremely easy way to purchase vetted, high-quality carbon offsets, zero is here to be your trusted agent for climate action. Talk to zero. Protect the planet.

About

Countdown Pro

Track important upcoming and past events with customizable countdowns. Monitor days remaining or elapsed for birthdays, holidays, goals, and more. Organize your dates with tags and filters, and view them on your home screen.

Highlights
  • Unlimited countdowns
  • Days-left and days-since tracking
  • Emoji, photo, and color customization
  • Home Screen and Lock Screen widgets
  • Repeating events and reminders
  • Shareable countdown cards
  • Offline use
Features
Read full description

Countdown Pro helps you track every important day in one simple app. Create countdowns for birthdays, anniversaries, vacations, exams, deadlines, weddings, holidays, trips, milestones, personal goals, bills, subscriptions, and more. Check how many days are left, or how many days have passed. FEATURES • Unlimited countdowns • Track upcoming and past events • Days-left and days-since tracking • Emoji, photo, and color customization • Tags, search, filtering, and grouping • Repeating events and reminders • Shareable countdown cards • Offline use with no account required PRO FEATURES • Home Screen and Lock Screen widgets • Single-event and multiple-event widgets • Detailed time display • Lunar date support for birthdays and anniversaries • Archive past events USE COUNTDOWN FOR • Birthdays and anniversaries • Weddings and holidays • Vacations and trips • Exams, assignments, and deadlines • Meetings and work events • Fitness goals and personal milestones • Bills, renewals, and subscriptions Countdown is built to be fast, simple, and easy to check every day. Keep all your important dates organized and never miss what matters. SUPPORT & LEGAL • Contact: support@richsoft.app • Privacy Policy: https://richsoft.app/countdown/privacy • Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

zero3 screens
Countdown Pro4 screens

Verdict

The call

The clearest difference is in-app purchases: zero at none against Countdown Pro's 1. zero also leads on iOS requirement (13.4 vs 18.6). Countdown Pro's advantage is update cadence (every 4 days vs every 4 months). On price, ads 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. Countdown Pro sells 1 one-off in-app purchase. zero asks for nothing beyond the download.

UpkeepUpdate frequency

zero ships an update every 4 months, Countdown Pro every 4 days. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

Scorecard3 real differences · 7 level
zero versus Countdown Pro: the parameters behind the verdict, then further details
ParameterzeroCountdown Pro
PriceFreeFree
Rating—3.6 (5 ratings) — better
Positive reviews—81.3% of reviews
Number of ratings—5 — better
Update frequencyEvery 4 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS13.4 — better18.6
Further details — not scored
Size34 MB42 MB
Age rating4+4+
DeveloperCole Stites-ClaytonRich Soft Co., Ltd

In-app purchases

None

zero

No in-app purchases

1 purchases

Countdown Pro

One-time1
  • Widget Lifetime$6.99

Questions

Is zero free?
zero is free to download, with no in-app purchases.
Is Countdown Pro free?
Countdown Pro is free to download, with in-app purchases available.
Do zero or Countdown Pro have ads?
Neither zero nor Countdown Pro shows ads.
Which is updated more often, zero or Countdown Pro?
zero ships an update every 4 months, and Countdown Pro every 4 days. Most recently, zero was updated on October 25, 2026 and Countdown Pro on October 28, 2026.

Other comparisons