One Calendar vs Milestone
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
One Calendar
Consolidate all your digital calendars into a single, easy-to-read view. Manage appointments, events, and birthdays from various providers like Google, Outlook, iCloud, and more, all within one application.
- Integrates multiple calendar providers
- Easy-to-read overview
- Manage appointments and events
- View birthdays
- Cross-platform availability
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The most popular app to view all your calendars like Google, Live, Outlook, iCloud, Exchange, Office365, Yahoo, Nextcloud, Synology, GMX, Mailbox.org, ownCloud and more. OneCalendar integrates all your calendars into an easy-to-read overview. View and manage all your appointments, events and birthdays. OneCalendar is available on all platforms.
Milestone
Create personalized, fixed-length challenges with daily rules and consequences. Track your progress visually and generate shareable recaps upon completion. Your goals, your terms, all stored privately on your device.
- Customizable challenges
- Daily rule setting
- Configurable consequences
- Visual progress tracking
- Shareable completion recaps
- Private by design (no account needed)
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Milestone is a private, offline commitment tracker for people who want to actually follow through. Design your own challenge — 7 to 365 days — with the daily rules that matter to you. Wake before 6. No alcohol. Read ten pages. Move for thirty minutes. Whatever you're committing to, you set the terms. Each day, complete your actions and deliberately "keep" the day with a press and hold. Milestone records it. Watch your streak build, your milestones unfold, and your progress fill in — one kept day at a time. Choose how strict you want to be: • Strict — one missed day restarts the count. • Flexible — a couple of grace days absorb a slip, so a single off day doesn't erase your run. REQUIRES A ONE-TIME PURCHASE Milestone is a paid app. Starting a challenge is a one-time in-app purchase, priced by length (from $3.99 to $29.99) — there is no subscription and nothing auto-renews. You buy a challenge once; when it's finished you can start another (returning finishers get a reduced price). A purchase is required to create and run a challenge. Private by design. Everything stays on your device — no account, no login, no feed, no ads, and no data leaving your phone. Just you and the commitment you made to yourself. Make the promise. Keep your word. Prove you can follow through.
Screenshots
Verdict
The clearest difference is monetization model: Milestone at free against One Calendar's free with in-app purchases. Milestone also leads on review sentiment (100% vs 81%) and rating (5.0 vs 4.8). One Calendar's advantage is ratings volume (21K vs 1) and device support (4 vs 1). On price, update cadence, ads and in-app purchases 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
Both are free to download. One Calendar sells 1 one-off in-app purchase and Milestone sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
Milestone holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: One Calendar has 21K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 81% of One Calendar's written reviews are positive against 100% of Milestone's.
One Calendar ships an update fortnightly, Milestone every 4 weeks. The most recent releases landed on October 14, 2026 and October 11, 2026 respectively.
| Parameter | One Calendar | Milestone |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (21K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 80.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 21K — better | 1 |
| Update frequency | Fortnightly — better | Every 4 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 89 MB | 59 MB |
| Age rating | 12+ | 4+ |
| Developer | Code Spark | Levi Provance |
Customer experience
One Calendar
Milestone
Bugs and requests
One Calendar
Reported bugs
5 issues- Sync errors
- Unresponsive buttons
- Incorrect time zone display
- Duplicate events
- Inability to delete future occurrences of recurring events
Requested features
6 requests- Multiple reminders for events
- Ability to edit recurring events
- Option to change event calendar after creation
- Printing support
- More customization options
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- Widgets for better visibility
Milestone
Not enough reviews yet to summarise bugs or requests.
In-app purchases
One Calendar
- OneCalendar premium$5.99
Milestone
- Finisher Discount$3.99
- Challenge, up to 30 days$4.99
- Finisher Discount$7.99
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- Challenge, 31 to 75 days$9.99
- Finisher Discount$11.99
- Challenge, 76 days and up$14.99
Questions
Is One Calendar free?
Is Milestone free?
Which has better reviews, One Calendar or Milestone?
Do One Calendar or Milestone have ads?
Which is updated more often, One Calendar or Milestone?
Other comparisons
