Comparison

Diary Calendar vs Project Time Tracker

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

Head to head
About

Diary Calendar

This calendar app supports the ICS standard for seamless integration with PC calendar software like Outlook and Lightning. It offers detailed date and monthly overviews, allows for time zone-specific appointments, and enables the creation of both one-off and recurring events.

Highlights
  • ICS standard compatibility
  • Date and monthly overviews
  • Time zone management
  • Recurring event creation
  • Searchable appointment list
  • External data storage
Features
Read full description

This app is suitable for calendars according to the ICS standard RFC 5545/5546,  which is used by most computer programs.  This is the prerequisite, so that you can also use your calendar from the PC  with Outlook, Lighting or other software. This calendar inherits the following functions: - Date Overview    All appointments are displayed time-dependent. The list can be searched. The list is kept on the iPhone and can be stored and loaded externally. Appointments can also be transferred from the iPhone - Monthly Overview    Monthly overview helps navigate through calendar dates quickly.  Appointments additional are listed separately.  An overview of appointments of the day couldt be called up on the screen. - Date    Appointments can include date and time or just the date.    These can be stored with or without time zone. So, for example    the date New Year should be used without time zone as the year    actually begins on earth at different times.    In contrast, a birthday with the time zone should be deposited, in    which the jubilarian lives. Thus, at the time of congratulation    nothing goes wrong. - Series date    One-off and serial appointments can be generated.    A recurring event is controlled by a rule by which the repetitive    appointments are generated. These rules fulfill the standard.    So you do not have to dive deeper into the rules, as most common rules could be created by key combination.

About

Project Time Tracker

This app helps freelancers and professionals meticulously track their work hours across various projects. It offers clear insights into where time is spent and includes features to prevent overworking. Data is stored locally and accessible offline.

Highlights
  • Project-based time tracking
  • Clear statistics and work hour insights
  • Offline functionality
  • Time Guard to prevent overworking
  • One-tap CSV export
Features
Read full description

TIME TRACKING WITHOUT A SIGN-UP – OPEN, START, DONE. No email, no password, no account. ProjectTimeTracker records your working hours per project, works completely offline, and turns your houres into a clean timesheet. Built for freelancers, contractors and anyone with flexible hours who has to prove or bill their time – without team software and without a learning curve. HOW IT WORKS: • Create a project, hit start – the timer keeps running even if you close the app or restart your device • Live Activity on the Lock Screen and in the Dynamic Island: project, elapsed time, status at a glance • Forgot to start it? Add the hours manually afterwards • Notes and tags per entry, so every hour has a reason TIME GUARD AGAINST OVERWORK: Set a daily limit, for one project or across all of them. A progress ring shows where you stand, and when you hit the limit the app reminds you to call it a day. Other apps optimise for more billable hours. This one doesn't. INSIGHTS: • Working time by day, week, month and year • Breakdown per project • Filter by project and by any date range you choose YOUR DATA STAYS YOURS: Everything lives on your device first. Sync between iPhone and iPad runs on an anonymous device ID – you never enter personal data. IPHONE AND IPAD: One app for both. On iPad you get a real split view instead of a stretched iPhone app, two-column charts and keyboard shortcuts (⌘N, ⇧⌘N, ⌘Space). FREE TO USE: Unlimited projects, every feature, all statistics and up to 250 time entries per calendar year – free forever. PREMIUM: • Unlimited time entries • PDF timesheets to send to your clients • Export to Excel, CSV or straight into your calendar • Full JSON backup Premium is a monthly or yearly subscription, cancel anytime. Track time. Analyze work hours. Invoice with confidence. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Diary Calendar4 screens
Project Time Tracker4 screens

Verdict

The call

The clearest difference is review sentiment: Project Time Tracker at 100% against Diary Calendar's 33%. Project Time Tracker also leads on price (Free vs $2.99) and update cadence (every 2 weeks vs every 3 months). Diary Calendar's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 18.0). On 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

Project Time Tracker is free to download; Diary Calendar costs $2.99 up front. Project Time Tracker sells 2 in-app purchases, starting at $1.00 per month. Diary Calendar asks for nothing beyond the download.

UpkeepUpdate frequency

Diary Calendar ships an update every 3 months, Project Time Tracker every 2 weeks. The most recent releases landed on September 10, 2026 and September 30, 2026 respectively.

Scorecard6 real differences · 4 level
Diary Calendar versus Project Time Tracker: the parameters behind the verdict, then further details
ParameterDiary CalendarProject Time Tracker
Price$2.99Free — better
Rating—5.0 (2 ratings) — better
Positive reviews33.3% of reviews100.0% of reviews — better
Number of ratings—2 — better
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better18.0
Further details — not scored
Size14 MB4 MB
Age rating4+4+
DeveloperHans Joachim GerhardtLukas Hummel

Customer experience

Diary Calendar

Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

Project Time Tracker

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Diary Calendar

No in-app purchases

2 purchases

Project Time Tracker

Subscriptions2
  • Monthly Subscription$1.001 Month
  • Yearly Subscription$9.001 Year

Questions

Is Diary Calendar free?
Diary Calendar costs $2.99, with no in-app purchases.
Is Project Time Tracker free?
Project Time Tracker is free to download, with in-app purchases available.
Do Diary Calendar or Project Time Tracker have ads?
Neither Diary Calendar nor Project Time Tracker shows ads.
Which is updated more often, Diary Calendar or Project Time Tracker?
Diary Calendar ships an update every 3 months, and Project Time Tracker every 2 weeks. Most recently, Diary Calendar was updated on September 10, 2026 and Project Time Tracker on September 30, 2026.

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