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Complete Guide to Sync Apple Reminders Between MacBook, MacBook Air, iPhone, and iCloud

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Below is a complete practical checklist for syncing Reminders between MacBook/MacBook Air, iPhone, and iCloud.

Apple Reminders Sync Checklist

For MacBook / MacBook Air + iPhone

Goal

Your reminders should sync like this:

Mac Reminders ↔ iCloud.com/reminders ↔ iPhone Reminders

If one device is not syncing, use iCloud.com/reminders as the middle point to find which side is broken.

Part 1: Check on MacBook / MacBook Air

1. Confirm Mac is using the correct Apple ID

On Mac:

System Settings → Your Name / Apple Account

Check that the Apple ID email is the same one used on:

  • iPhone
  • iCloud.com
  • Other Apple devices

If Mac and iPhone use different Apple IDs, Reminders will not sync.

2. Confirm Reminders is enabled in iCloud on Mac

On Mac:

System Settings → Your Name → iCloud → Show All → Reminders → ON

If it is OFF, turn it ON.

3. Open Reminders app and show sidebar

Open Reminders app on Mac.

Then go to:

View → Show Sidebar

The sidebar helps you see:

  • Today
  • Scheduled
  • All
  • Flagged
  • Completed
  • Your reminder lists

4. Check your Reminder lists

In Mac Reminders sidebar, check all list names.

Example:

  • Reminders
  • Work
  • Personal
  • Shopping
  • Your custom list, like icloud

Important: A list named “icloud” is only a list name if you created it manually. It does not automatically mean it is the real iCloud account.

5. Check Mac default Reminder list

On Mac:

Reminders app → Reminders menu → Settings

Check:

Default List

Choose the list where you want new reminders to go.

Example:

If your actual reminders are inside a list called Work Reminders, set that as default.

6. Create a Mac test reminder

On Mac Reminders app, create:

TEST FROM MAC

Then open:

https://www.icloud.com/reminders

Check whether TEST FROM MAC appears there.

Result

If it appears on iCloud.com, Mac is syncing correctly.

If it does not appear on iCloud.com, Mac is not uploading reminders to iCloud.

7. If Mac is not syncing, restart Reminders sync daemon

Quit Reminders app.

Open Terminal and run:

killall remindd

Then reopen Reminders and wait 1–2 minutes.

8. Refresh iCloud Reminders on Mac

If Mac still does not sync:

On Mac:

System Settings → Your Name → iCloud → Show All → Reminders → OFF

If asked, choose Keep a Copy.

Then:

  1. Restart Mac
  2. Go back to iCloud settings
  3. Turn Reminders ON
  4. Open Reminders app
  5. Wait a few minutes

Part 2: Check on iPhone

1. Confirm iPhone is using the correct Apple ID

On iPhone:

Settings → Your Name

Check the Apple ID email.

It must match the Apple ID used on Mac and iCloud.com.

2. Confirm Reminders is enabled in iCloud on iPhone

On iPhone:

Settings → Your Name → iCloud → Show All / See All → Reminders → ON

If it is OFF, turn it ON.

3. Check iPhone Reminders app properly

Open Reminders app on iPhone.

Tap:

Lists

Then check:

  • All
  • Scheduled
  • Reminders
  • Your custom list names
  • Any hidden or collapsed sections

Do not only check Today. Future reminders may not appear there.

4. Search exact reminder name on iPhone

Inside iPhone Reminders app, search for one exact reminder from Mac.

Example:

Pomerium Proxy

or

Management Interface

If search finds it, sync is working but the reminder is hidden inside another list/view.

5. Check iPhone Default List

On iPhone:

Settings → Apps → Reminders → Default List

On older iOS versions:

Settings → Reminders → Default List

Choose an iCloud-based list.

Avoid selecting Gmail, Outlook, Exchange, Yahoo, or local iPhone lists unless you specifically want reminders stored there.

6. Force close Reminders app

On iPhone:

  1. Swipe up from bottom
  2. Close Reminders app fully
  3. Wait 30 seconds
  4. Open Reminders again
  5. Wait 1–2 minutes on Wi-Fi

7. Restart iPhone

Restart iPhone completely.

Then open:

Reminders → Lists → All

Check again.

8. Refresh iCloud Reminders sync on iPhone

This is the fix that worked for you.

Because your reminders are already visible on iCloud.com, this is safe.

On iPhone:

Settings → Your Name → iCloud → Show All → Reminders → OFF

If asked, choose:

Delete from My iPhone

This removes only the local iPhone copy. Your reminders remain safe in iCloud because they are visible on iCloud.com.

Then:

  1. Restart iPhone
  2. Go back to iCloud settings
  3. Turn Reminders ON
  4. Open Reminders app
  5. Wait 2–5 minutes on Wi-Fi

9. Create iPhone test reminder

On iPhone, create:

TEST FROM IPHONE

Then open:

https://www.icloud.com/reminders

Check if it appears there.

Result

If it appears on iCloud.com, iPhone upload is working.

If it does not appear, iPhone Reminders is still not properly connected to iCloud.

Part 3: Use iCloud.com as the main sync test

Open:

https://www.icloud.com/reminders

This is the best way to identify the problem.

Test 1: Mac to iCloud

Create reminder on Mac:

TEST FROM MAC

Check iCloud.com.

If visible, Mac sync is working.

Test 2: iCloud to iPhone

Create reminder on iCloud.com:

TEST FROM ICLOUD

Check iPhone.

If not visible, iPhone download sync is broken.

Test 3: iPhone to iCloud

Create reminder on iPhone:

TEST FROM IPHONE

Check iCloud.com.

If not visible, iPhone upload sync is broken.

Part 4: Other important checks

1. Check internet connection

Make sure both Mac and iPhone are connected to the internet.

Prefer Wi-Fi while troubleshooting.

2. Check Date & Time

On iPhone:

Settings → General → Date & Time → Set Automatically → ON

On Mac:

System Settings → General → Date & Time → Set time and date automatically → ON

Wrong date/time can create sync issues.

3. Update iOS and macOS

On iPhone:

Settings → General → Software Update

On Mac:

System Settings → General → Software Update

Install pending updates if available.

4. Check iCloud storage

On iPhone:

Settings → Your Name → iCloud

Check if iCloud storage is full.

If iCloud storage is full, syncing may stop or become unreliable.

5. Check Low Power Mode / network restrictions

On iPhone:

Settings → Battery → Low Power Mode → OFF

Also avoid troubleshooting sync while using unstable mobile data, VPN, or restricted office Wi-Fi.

Best Troubleshooting Flow

Use this order:

  1. Confirm same Apple ID on Mac and iPhone
  2. Confirm Reminders is ON in iCloud on both devices
  3. Check iCloud.com/reminders
  4. Create TEST FROM MAC
  5. Create TEST FROM ICLOUD
  6. Create TEST FROM IPHONE
  7. If Mac works but iPhone does not, refresh iPhone sync:
    Reminders OFF → Delete from My iPhone → Restart → Reminders ON
  8. Wait 2–5 minutes on Wi-Fi

Your Case Summary

In your case:

  • Mac reminders were visible on iCloud.com
  • iPhone was not showing them
  • So Mac was working correctly
  • iPhone local Reminders sync cache was stuck
  • The fix was:

iPhone → Settings → Your Name → iCloud → Show All → Reminders → OFF → Delete from My iPhone → Restart iPhone → Reminders ON

That is the main fix to remember for future.

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