Comparison

Bubble Days vs Cairn

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

Head to head
About

Bubble Days

Features
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Bubble Calendar is a fresh new way to visualize your schedule as bubbles. Each bubble holds your day. The inner dot represents morning events, the outer dot represents afternoon events. The bigger the bubble, the busier the day. Just type naturally and it recognizes the date and time automatically. Try "Dance class Thu 7:30pm" or "Dentist tomorrow" β€” it just works. A Monday-first week layout lets you see your entire schedule at a glance.

About

Cairn

Features
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Cairn (차곑차곑) is a calm, anonymous-first todo app β€” every core feature works without an account. Like the small stones stacked into a cairn on a quiet trail, line up today's tasks one by one with clarity. β–  Core features - Anonymous by default: no sign-up, no transmission. All data stays on your device. - Inline markers: type @, #, !, * to set date, time, importance, and repeat in one line. e.g. "@tomorrow #3pm meeting", "*every-monday run". - Two-way swipe: left for reschedule / favorite / repeat. Right for duplicate / move group / delete. - Groups and color labels: organize by work, personal, fitness β€” at a glance. - Notifications with quiet hours: push reminders that auto-defer to the next morning during quiet hours. - Stats dashboard: weekly / monthly / yearly completion, 14-day sparkline, average completion time. - Backup & restore: JSON / CSV / Markdown export and import. Move devices safely. - Dark mode and three themes (Tica, Tally, Nudge). - English / Korean auto-detected. β–  Tracks - Anonymous (default): full core, on-device only. - Pro: ad-free β€” one-time purchase, yours forever. β–  What we don't collect No location, contacts, photos, microphone, camera, or health data. In anonymous mode, not a single byte leaves your device. β–  About Sobok β€” building small tools that add quiet order to daily life. Contact: admin@sobok.kr Privacy / Terms: https://sobok.kr/carin/legal/terms

Screenshots

Bubble Days3 screens
Cairn4 screens

Verdict

The call

The clearest difference is in-app purchases: Bubble Days at none against Cairn's 3. Bubble Days also leads on ads (none vs shown) and update cadence (every 2 days vs every 5 days). On price, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Cairn sells 3 in-app purchases, starting at $1.99 per month. Bubble Days asks for nothing beyond the download.

UpkeepUpdate frequency

Bubble Days ships an update every 2 days, Cairn every 5 days. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

Scorecard3 real differences Β· 3 level
Bubble Days versus Cairn: the parameters behind the verdict, then further details
ParameterBubble DaysCairn
PriceFreeFree
Update frequencyEvery 2 days β€” betterEvery 5 days
AdsNo β€” betterYes
In-app purchasesNo β€” betterYes
DevicesiPhone, iPad, iPodiPhone, iPod, Apple Watch
Requires iOS15.015.0
Further details β€” not scored
Size3 MB41 MB
Age rating4+4+
Developereunju kangHeajung Yoo

In-app purchases

None

Bubble Days

No in-app purchases

3 purchases

Cairn

Subscriptions2
  • Cairn Pro Monthly$1.991 Month
  • Cairn Pro yearly$12.991 Year
One-time1
  • Cairn Pro - Ad-free forever$0.99

Questions

Is Bubble Days free?
Bubble Days is free to download, with no in-app purchases.
Is Cairn free?
Cairn is free to download, with in-app purchases available.
Do Bubble Days or Cairn have ads?
Cairn shows ads; Bubble Days does not.
Which is updated more often, Bubble Days or Cairn?
Bubble Days ships an update every 2 days, and Cairn every 5 days. Most recently, Bubble Days was updated on October 7, 2026 and Cairn on October 12, 2026.

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