Comparison

Master One vs One Line

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

Head to head
About

Master One

This app guides you in building habits by focusing on one at a time. You can set custom durations, track your progress and streaks, and review your completed habits. It offers a clean, distraction-free interface with options to archive or restart habits.

Highlights
  • One habit focus
  • Custom habit durations
  • Streak and history tracking
  • Mastered habits archive
  • Minimalist design
  • Archive and restart habits
  • Strict mode for perfect streaks
Read full description

Master One helps you focus on building habits one at a time. Set your own duration, track streaks, update your progress, and celebrate every success. Features: ◆ One Habit at a Time: Simplify your focus for better results. ◆ Custom Durations: Choose how long to work on each habit. ◆ Streak & History Tracking: Monitor progress, edit past entries, and stay on track. ◆ Mastered Habits: Reflect on your growth with a list of completed habits. ◆ Clean, Minimal Design: Beautiful, simple, and distraction-free. ◆ Archive & Restart – Pause habits anytime and pick them up later. ◆ Strict Mode – Only count progress with perfect streaks—no gaps allowed. ◆ Themes – Personalize your experience with different styles.

About

One Line

Features
Read full description

Type one line. That's the whole system. Most notes apps die the same way: organizing them becomes the work. Folders, projects, boards, tag syntax — a filing system you have to maintain before you're allowed to write anything down. One Line has none of that. You type a line and it stays exactly as you wrote it. Write "dentist tomorrow at 3pm" and the app offers "Tomorrow 3:00 PM · Add" — one tap sets the time and a reminder, or skip it and keep the line as written. The app never rewrites your words on its own. ■ Notes, tasks, and events in one stream Not three apps. Not three tabs you keep forgetting to open. One place you actually write to, with a Today view for what's in front of you and a calendar for what's coming. ■ Nothing leaves your device unless you ask No account is needed to use the app. Your writing is stored on your iPhone, and the app reads it on the device itself — nothing is sent anywhere to be processed. No ads, no tracking, no advertising identifier. Airplane mode changes nothing. Turn on Cloud sync and you sign in with Apple or Google; only then is anything you write stored on our servers. The separate, opt-in usage stats send counts of which features you used, once a week, plus a crash report if the app quits on you — never your notes. Turn on link previews and the request goes straight to that site — never through us, and we never learn what you looked at. It is off until you turn it on. ■ You don't have to open the app · A Home Screen widget shows today at a glance · Tap the widget once to capture straight into the app · Share from Safari and the page title and article are saved with it — add "todo read tomorrow" while sharing and it becomes a task for tomorrow · Share text or a screenshot from any other app and it's saved · Due dates and events arrive as notifications ■ Gets in without typing (Pro) · Share a screenshot and the text on it becomes a note — menus and status bars stripped, dates, phone numbers and amounts pinned to the top · Snap a photo or a document and the text inside is read · Record a voice memo and it is transcribed · Long articles shared from Safari can be summarized in a few lines (Apple Intelligence devices) · The reading happens on this device. Photos and voice are never sent anywhere to be read ■ Free, and actually complete · Unlimited notes, tasks, and events · Natural-language dates in English and Korean — "dentist tomorrow 3pm", "report by friday", "every monday gym" — offered, never forced · Polish — fixes only spelling and spacing, and shows you the change before it's applied (Apple Intelligence devices) · Sync across your devices — sign in and pick up where you left off. Photos, recordings and attachments come along too, up to 5 GB · Today view, calendar, notifications, widgets · Export a backup file and restore from it · Export everything as Markdown files No item caps. No ads. No trial that runs out. ■ One Line Pro · Yearly, with a discounted first year · Monthly · Lifetime — a launch price. Pay once and keep every Pro feature, including the ones that come later · Gets in without typing — Text from photos · Transcription · Article summary (Apple Intelligence devices) · Search what piled up — Semantic search: find "that hospital thing last month" without remembering the exact words · Keep it on your Home Screen — Pinned note widget Prices are shown in your local currency on the App Store. Cancel any time. Everything stays on your device. ■ Terms & Privacy · Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel any time in your App Store account settings. Lifetime is a one-time, non-consuming purchase and does not renew. · Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ · Privacy Policy: https://oneline.date/en/privacy

Screenshots

Master One4 screens
One Line4 screens

Verdict

The call

The clearest difference is ads: One Line at none against Master One's shown. One Line also leads on update cadence (daily vs every 2 months). Master One's advantage is iOS requirement (16.6 vs 18.0). On price, in-app purchases 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

Both are free to download. Master One sells 1 one-off in-app purchase and One Line sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Master One ships an update every 2 months, One Line daily. The most recent releases landed on November 4, 2026 and November 10, 2026 respectively.

Scorecard3 real differences · 6 level
Master One versus One Line: the parameters behind the verdict, then further details
ParameterMaster OneOne Line
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 2 monthsDaily — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhoneiPhone, iPad — better
Requires iOS16.6 — better18.0
Further details — not scored
Size3 MB37 MB
Age rating4+4+
DeveloperMary OgawaXTI Co.,Ltd.

In-app purchases

1 purchases

Master One

One-time1
  • LIFE_PURCHASE$0.99
2 purchases

One Line

Subscriptions2
  • One Line Pro (Monthly)$1.991 Month
  • One Line Pro1 Year trial$17.991 Year

Questions

Is Master One free?
Master One is free to download, with in-app purchases available.
Is One Line free?
One Line is free to download, with in-app purchases available.
Do Master One or One Line have ads?
Master One shows ads; One Line does not.
Which is updated more often, Master One or One Line?
Master One ships an update every 2 months, and One Line daily. Most recently, Master One was updated on November 4, 2026 and One Line on November 10, 2026.

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