Comparison

Only Calendar 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

Only Calendar

Features
Read full description

Only Calendar is a simple, focused calendar for people who want to plan clearly without clutter. Create events with notes, locations, links, colors, reminders, durations, and repeating schedules. Switch between Month, Week, and List views to see your plans from the right angle. Use search, quick filters, color filters, archives, and undo actions to keep your calendar tidy as it grows. Only Calendar also supports basic ICS import and export, JSON export, text export, Home Screen and Lock Screen widgets, app language selection, local notifications, and private iCloud sync for Pro users. Only Calendar Pro is a one-time purchase with no subscription. Pro removes the 25 active-event limit and unlocks private iCloud sync through your personal iCloud account, including event details, reminders, repeats, colors, locations, links, notes, and archived events.

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 files itself — "buy milk" becomes a to-do, "dentist tomorrow at 3pm" becomes an event with a reminder, and everything else stays a note. If it reads a line wrong, one tap changes it, and it remembers the correction. ■ 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 and sorts 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" · 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

Only Calendar3 screens
One Line4 screens

Verdict

The call

Only Calendar and One Line are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. Only Calendar 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.

ScorecardNo meaningful differences
Only Calendar versus One Line: the parameters behind the verdict, then further details
ParameterOnly CalendarOne Line
PriceFreeFree
Update frequency—Every 2 days
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone, iPad — better
Requires iOS17.0 — better18.0
Further details — not scored
Size3 MB37 MB
Age rating4+4+
DeveloperLizzian LLCXTI Co.,Ltd.

In-app purchases

1 purchases

Only Calendar

One-time1
  • Only Calendar Pro$5.99
2 purchases

One Line

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

Questions

Is Only Calendar free?
Only Calendar 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 Only Calendar or One Line have ads?
Neither Only Calendar nor One Line shows ads.

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