Comparison

Serea Smart Lock vs Lineár Calendar

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

Head to head
About

Serea Smart Lock

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Replacing your physical keys, the Serea app is your digital platform to operate, manage and share your Serea lock. Simply register for free and log in into your account to either add a lock, share your lock or receive access to the lock of friend or family member. With Serea, this is all done in one place. Serea relies on the reliability and safety of Near Field Communication (NFC). With this technology, you can unlock your Serea lock without any physical key. Next to that, the app uses the NFC technology to transmit a small pulse of energy to open the lock, meaning that your lock does not require any battery. Features: - Pair and manage your lock - Share your lock with anyone for as long as you want - Offline feature – even if you have no internet connection, you can still open your lock - Track the locations where you have opened the lock (optional) - Your digital key safely secured via a cryptographic technology The Serea App is programmed in the heart of Europe: Austria. By using high security standards, while respecting our user’s privacy, we created a platform with the sole purpose of making it easier to lock your bicycle, scooter or anything you want. This app programmed and tested to work on iOS Version 12 or later. Please make sure your smartphone has an integrated NFC chip.

About

Lineár Calendar

Visualize your entire year in a single, elegant view. This app offers multiple perspectives and customization options to help you spot busy periods and find gaps instantly. Plan more effectively by seeing the bigger picture of your schedule.

Highlights
  • Full year view
  • Horizontal and vertical layouts
  • Linear and regular day alignments
  • Coloured event bars
  • Calendar filtering and custom colours
  • Sticky header/column
  • PDF export
Features
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Zoom Out. See the Bigger Picture. Lineár shows your whole year in a single view: all 365 days at once. Spot busy stretches, find free time, and see how everything fits without flipping through months. Events appear as coloured bars across the days they span. Tap any one for the details. Scroll Through the Years (New in 2.1) Keep scrolling past December into the next year, or back into the last one. No switching, no page breaks, just one continuous timeline. Four Ways to See Your Year Horizontal (months as rows) or vertical (months as columns, like a wall planner), each with two day arrangements: - Linear: days align by weekday, so overloaded days and free time stand out. - Regular: days align by date (1–31), every month's 1st in the same column. Edit Right on Your Calendar Create, edit, and delete events without leaving Lineár: times, locations, notes, links, reminders, and full repeating events. Move events between calendars and choose a default calendar for new ones. Your first 10 edits are free. Lineár Pro then unlocks unlimited editing as a one-time purchase, no subscription. Viewing always stays free. Your Calendars, Your Way Works with iCloud, Google, Exchange, and subscribed calendars in their own colours. Tap a calendar in the toolbar to show or hide it, long press to see only that one. Drag calendars in the sidebar to set which events come out on top, and give any calendar your own colour. Clean Design, Full Control Choose a preset (Yellow, Green, B&W, High Contrast) or customise colours, fonts, and layout. Pin the header or left column while scrolling, like freezing panes in a spreadsheet. Compact mode fits row heights to your events. Filter out timed or single-day events, and show week numbers and event times. Made for Every Screen Lineár runs on Mac, iPad, iPhone, and iPhone Duo. On Mac, hover over events for a quick preview and use keyboard shortcuts. On iPhone and iPad, pinch to zoom. An online manual is available from the app. Print It. Share It. Export your year as a PDF in A4, A3, Letter, Legal, Tabloid, or Square, portrait or landscape. Print directly on Mac. Features - Whole year in one view, horizontal or vertical - Continuous scrolling across years - Linear (weekday) and Regular (date) modes - Create, edit, and delete events, repeats included (Lineár Pro) - Calendar filters, custom colours, and drag-to-reorder priority - Colour presets, compact mode, week numbers, event times - Sticky header and left column - Zoom, pinch-to-zoom, and scroll to today - PDF export and printing (Mac) - Hover previews and keyboard shortcuts (Mac) - iCloud, Google, Exchange, and subscribed calendars - Dark mode Viewing your calendar is always free. Lineár Pro unlocks unlimited editing as a one-time purchase, no subscription.

Screenshots

Serea Smart Lock4 screens
Lineár Calendar4 screens

Verdict

The call

The clearest difference is in-app purchases: Serea Smart Lock at none against Lineár Calendar's 1. Serea Smart Lock also leads on iOS requirement (15.0 vs 17.0). Lineár Calendar's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads 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. Lineár Calendar sells 1 one-off in-app purchase. Serea Smart Lock asks for nothing beyond the download.

UpkeepUpdate frequency

Serea Smart Lock ships an update every 3 months, Lineár Calendar every 2 weeks. The most recent releases landed on November 4, 2026 and November 7, 2026 respectively.

Scorecard3 real differences · 7 level
Serea Smart Lock versus Lineár Calendar: the parameters behind the verdict, then further details
ParameterSerea Smart LockLineár Calendar
PriceFreeFree
Rating—4.0 (3 ratings) — better
Positive reviews—92.9% of reviews
Number of ratings—3 — better
Update frequencyEvery 3 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free
DevicesiPhone, iPodiPhone, iPad, Mac — better
Requires iOS15.0 — better17.0
Further details — not scored
Size53 MB8 MB
Age rating4+4+
DeveloperPEWAGTheMM

In-app purchases

None

Serea Smart Lock

No in-app purchases

1 purchases

Lineár Calendar

One-time1
  • Lineár Pro$4.99

Questions

Is Serea Smart Lock free?
Serea Smart Lock is free to download, with no in-app purchases.
Is Lineár Calendar free?
Lineár Calendar is free to download, with in-app purchases available.
Do Serea Smart Lock or Lineár Calendar have ads?
Neither Serea Smart Lock nor Lineár Calendar shows ads.
Which is updated more often, Serea Smart Lock or Lineár Calendar?
Serea Smart Lock ships an update every 3 months, and Lineár Calendar every 2 weeks. Most recently, Serea Smart Lock was updated on November 4, 2026 and Lineár Calendar on November 7, 2026.

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