# Cairn: Focus & Study Timer — Pomodoro deep work & habits

> Pomodoro deep work & habits (iPhone/iPad app by Pham Van Hai.)

- Source: https://appshunter.io/ios/app/cairn-focus-and-study-timer/id6811870112 (this page in markdown: same URL + `.md`)
- Developer: [Pham Van Hai](https://appshunter.io/developer/6805783484)
- Category: Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.0 · 35 MB
- Languages: American English, Japanese, Vietnamese
- Released: 2026-09-19
- Data updated: 2026-09-23
- User reviews in markdown: https://appshunter.io/ios/app/cairn-focus-and-study-timer/id6811870112/reviews.md

## What is Cairn?

Focus that leaves something behind.Cairn is a calm Pomodoro and deep-work timer. Finish a focus session and it forges a small, one-of-a-kind keepsake — a piece of generative art that's yours to keep, forever.No streaks to guilt you. No trees that die. No ads, no subscription, no tracking. Buy it once.Plant a focus. Grow a garden of your work.Every completed session blooms into a unique keepsake and joins your terrarium — a quiet, growing record of the time you gave your attention. Each one is deterministic and permanent: the same focus always grows the same object, and it never withers.Why Cairn feels different• A keepsake, not a chore. Reward without the gamified guilt — nothing dies if you stop.• Buy once, keep forever. One purchase unlocks everything. No subscription, ever.• Private by design. 100% on-device. No account, no ads, no tracking, works offline.• Calm, not hustle. Built for deep work, study, and reading — not dopamine loops.Everything you'd want in a focus timer• Pomodoro and custom-length sessions for study, work, and reading• A living garden/terrarium of everything you've grown• A diary calendar and honest stats — hours, rhythm, materials• Home & Lock Screen widgets, Live Activity & Dynamic Island, Control Center• Apple Watch app with complications — start a focus from your wrist• Full iPhone + iPad, light & dark, and accessibility supportCairn Pro — one purchase, foreverUnlock every material, palette, and the full garden with a single buy-once purchase. No subscriptions, no upsells.Focus is fleeting. What you make of it doesn't have to be.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Cairn Pro · Lifetime Unlock | $1.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-09-19

No release notes.

## More apps by Pham Van Hai

- [ReSurface: ADHD Reminders](https://appshunter.io/ios/app/resurface-adhd-reminders/id6805783482)
- [即LiDAR 現場をすぐ計測・丁張り](https://appshunter.io/ios/app/lidar/id6807720748)
- [即見積 - LiDARで内装リフォーム見積・積算](https://appshunter.io/ios/app/lidar/id6809005387)
- [Homeko: Praise Parenting Log](https://appshunter.io/ios/app/homeko-praise-parenting-log/id6810564394)

All apps by Pham Van Hai: https://appshunter.io/developer/6805783484

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-23.*