Comparison

Extreme Calendar vs Clock In For Work

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

Head to head
About

Extreme Calendar

This powerful calendar app offers advanced views and flexible event management for busy individuals. It integrates with native calendar data and provides quick event entry, with options to expand functionality through in-app purchases.

Highlights
  • Advanced calendar views (Year, Month, Week, Day, Agenda)
  • Birthdays and Anniversaries from contacts
  • Advanced repeating event options
  • Move/Copy Events
  • Natural Language Entry
  • Event Templates
  • Syncs with native calendar data
Features
Read full description

One of the most powerful calendars on iOS. Advanced views with plenty of options all designed for speed and flexibility. You wont get this much information at a glance from any other calendar, and adding events in-line allows you to get in and out and on with your busy day. Based on Extreme Agenda, it gives you the powerful calendar based views you want at a low price, and allows you to purchase the other features of the full Organizer once you need them. Features Include: Great Calendaring • Powerful views including Year, Month, Week, Upcoming Agenda List, and Day. • Pull Birthdays and Anniversaries from your contacts with pictures. • Advanced repeating event options. • Move/Copy Events • Military time, ISO week, and week start options. • Uses and expands on your native calendar data. • Sync like you would with the default calendar(Google, iCloud, Exchange). • Next month preview option on Month View • Uses time bars and icons to keep you informed at a glance • Put event text right on calendar • Filter events based on iCal calendars. • Almost 200 professional icons to mark your events • Natural Language Entry • Event Templates • Email Events • Drag-n-Drop Events Power and Flexibility • Universal Support • TextExpander Support • Portrait and Landscape Support. • Retina and iPhone 5 Display Support. • Background and color theme choices. • Help System • Easily upgraded to Extreme Agenda Planner --------------------------------------- InApp Purchase When you are ready to upgrade just pay the difference and your Extreme Calendar becomes Extreme Agenda. Doing so adds powerful contact, task, note, and list views along with search, weather, private filtering, a status coloring choice, and over 800 more icons. And it adds categories for coloring, icons, and advanced filtering. Otherwise if you want it all now, look for 'Extreme Agenda' in the AppStore. ------------------------------------- Interface You can tap-h-hold in the main calendar days and in the time area of the timeline day view for an 'add and paste' toolbar. Copy/Move, used with the paste, are in the toolbar on each event in timeline day. ------------------------------------- Tech Support / Reviews Please email us with feature suggestions, bug reports, or you can't figure something out instead of using the reviews if you are rating low, its not good practice to get what you want. Or find Extreme Agenda on Facebook or give @birdsoft a shout out on Twitter and let us know there! We address most problems reported right away if they really are problems and will help you find a solution. We also list known problems on our site and how they are being resolved. If you like the app and it works fine for you and/or we worked to get in the features you requested please leave a review to let people know. We're working hard to give you everything you want in a calendar. -------------------------- Get Organized. Go Extreme!

About

Clock In For Work

Easily track your work hours for projects. This tool allows for simple administration of your time, including adding holidays and sick days. Export and import your working hours data in CSV format.

Highlights
  • Calculate working hours
  • Project time tracking
  • Add holidays and sick days
  • Export/import as CSV
  • Easy administration
Features
Currently charting
Read full description

A tool to calculate your working hours for a project.  Easy to administer your hours.  Add holidays or sickdays. Export and import your working hours as csv.

Screenshots

Extreme Calendar4 screens
Clock In For Work3 screens

Verdict

The call

The clearest difference is in-app purchases: Clock In For Work at none against Extreme Calendar's 1. Clock In For Work also leads on review sentiment (100% vs 73%) and price ($2.99 vs $7.99). Extreme Calendar's advantage is ratings volume (24 vs 5) and iOS requirement (12.0 vs 16.0). On rating, 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

Extreme Calendar costs $7.99 and Clock In For Work $2.99 up front. Extreme Calendar sells 1 one-off in-app purchase. Clock In For Work asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.3 for Extreme Calendar against 4.4 for Clock In For Work. Both are backed by a comparable volume of ratings — 24 and 5 respectively. Written reviews are what separate them: 73% of Extreme Calendar's written reviews are positive against 100% of Clock In For Work's.

UpkeepUpdate frequency

Extreme Calendar ships an update every 4 months, Clock In For Work every 5 weeks. Both last shipped on October 29, 2026.

Scorecard8 real differences · 3 level
Extreme Calendar versus Clock In For Work: the parameters behind the verdict, then further details
ParameterExtreme CalendarClock In For Work
Price$7.99$2.99 — better
Rating4.3 (24 ratings)4.4 (5 ratings) — better
Positive reviews73.0% of reviews100.0% of reviews — better
Number of ratings24 — better5
Update frequencyEvery 4 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank—#98 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size30 MB3 MB
Age rating4+4+
DeveloperBirdsoft LLCH Hubeek

Customer experience

Extreme Calendar

All ratings24 ratings
Positive83.3%
Neutral8.3%
Negative8.3%
Written reviews115 reviews
Positive73.0%
Neutral14.8%
Negative12.2%

Clock In For Work

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Extreme Calendar

Reported bugs

15 issues
  • App crashes on launch or during use
  • Events disappearing without explanation
  • Bouncy event creation window causing data loss
  • Syncing failures between iPhone and iPad
  • App becomes unresponsive with large contact lists
Show 10 more
  • Notifications interrupt and reset event creation
  • Recurring events not functioning properly
  • Cannot delete certain categories
  • Appointments not saving
  • Deleted items still appearing in calendar
  • Swipe navigation not working reliably
  • Copy/paste functionality slow and unreliable
  • App crashes when trying to edit recurring events
  • Categories not syncing across devices
  • Blank screen on iPad

Requested features

15 requests
  • More diverse icon options
  • Better alarm/reminder sound variety
  • Ability to display notes in monthly view
  • Drag-and-drop appointment editing
  • Double-tap to create appointments
Show 10 more
  • Larger icon display options
  • Geographic data integration for addresses
  • Contact integration with events
  • Last occurrence of month recurring option (e.g., last Wednesday)
  • Alphabetizable/sortable menus
  • UK date format support
  • Two-month detailed view option
  • Auto-scroll to current time in daily view
  • More color options
  • Picture/photo support in notes

Clock In For Work

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Extreme Calendar

One-time1
  • Extreme Agenda$3.99
None

Clock In For Work

No in-app purchases

Questions

Is Extreme Calendar free?
Extreme Calendar costs $7.99, and also offers in-app purchases.
Is Clock In For Work free?
Clock In For Work costs $2.99, with no in-app purchases.
Which has better reviews, Extreme Calendar or Clock In For Work?
Clock In For Work is rated higher. Extreme Calendar averages 4.3 out of 5 from 24 ratings, while Clock In For Work averages 4.4 from 5 ratings.
Do Extreme Calendar or Clock In For Work have ads?
Neither Extreme Calendar nor Clock In For Work shows ads.
Which is updated more often, Extreme Calendar or Clock In For Work?
Extreme Calendar ships an update every 4 months, and Clock In For Work every 5 weeks. Most recently, Extreme Calendar was updated on October 29, 2026 and Clock In For Work on October 29, 2026.

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