Comparison

Strflow vs Zapp Calendar

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

Head to head
About

Strflow

This app offers a unique chat-style interface for taking notes, organizing them with tags, and setting reminders. It integrates seamlessly with iOS features and ensures your data is secure and exportable.

Highlights
  • Chat-style note-taking
  • Timeline organization
  • Tagging system
  • Todo lists and reminders
  • Quick capture from anywhere
  • Rich text editor
  • iCloud sync and backup
Features
Read full description

Strflow adopts a chat-style timeline format for incredibly simple and beautiful note-taking. Experience the simplicity of note-taking in a texting-yourself style. # Build Your Timeline As you jot down notes, a personal timeline naturally forms. With tags, you can also create timelines focused on specific topics. Tags can be attached or created from anywhere, and you can easily reorder them with drag & drop in the sidebar. # Todo & Reminders, Naturally in Your Timeline Strflow turns your checklists into a dedicated Todo timeline, so you can easily review tasks, check them off, and add new ones from a single view. You can also set notes for future dates and use them as reminders. Scheduled notes stay hidden until the right time, then gently surface with notifications—right when you need them. # Quick Notes Anywhere Sync quickly and capture notes from anywhere. Open the app and start typing instantly, access Strflow from the share sheet — no need to switch apps. # Native on iOS Strflow is designed natively for iOS, blending perfectly with its look and feel. It also integrates with system features like Apple Shortcuts and the share sheet—making it easy to fit into your workflow. # Your Data, 100% Yours Your data is stored safely on your device and in iCloud. When saved to iCloud, it’s encrypted with your iCloud Keychain. For those using iCloud’s Advanced Data Protection, enjoy the added security of end-to-end encryption. All data can also be exported as Markdown, so you can take it anywhere with no lock-in. # A Powerful Editor Strflow supports a wide range of rich-text editing features, including: • Link previews • Checklists • Note links • Inline formatting (bold, italic, etc.) • Block-level formatting (lists, code blocks, quote blocks, etc.) • Images --- Strflow lets you take unlimited notes for free. By joining Strflow Plus, you’ll unlock encrypted sync and backup via iCloud. Prices may vary by location. Subscriptions will be charged to your credit card via your App Store account. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. Once activated, subscriptions cannot be canceled. Manage your subscriptions in your App Store Account Settings after purchase. Any unused portion of a free trial period, if offered, will be forfeited upon purchasing a subscription. The lifetime option is a one-time, non-renewing purchase that grants permanent access to Strflow Plus features. --- For any questions or feedback, please feel free to contact us at support@strflow.app. We are eager to assist and connect with you! Privacy policy: https://strflow.app/privacy-policy Terms of use: https://strflow.app/terms

About

Zapp Calendar

Features
Read full description

Type one sentence. Get one event. Zapp Calendar turns the way you talk into the way you plan. Tell it what's happening, tap save, done. HOW IT WORKS • Type the way you'd say it — "Dentist Friday 3pm at Dr. Smith." • Zapp recognizes the date, time, location, duration, and recurrence. • Tap to save directly into Apple Calendar. WHAT ZAPP UNDERSTANDS • Dates — "tomorrow", "next Friday", "march 12", "the 1st of every month" • Times — "3pm", "14:00", "half past ten", "from 2 to 4pm" • Locations — "at Mom's", "@office", "in Munich" • Durations — "for 2 hours", "30 minutes" • Reminders — "remind 30 min before" • Recurrence — "every Wednesday", "weekly", "monthly", "daily" BILINGUAL BY DESIGN Full German and English — including colloquialisms. "Jeden Mittwoch 18 Uhr Yoga" and "Every Wednesday 6pm yoga" both work. Zapp adapts to your device language. ZAPP PRO — €4.99 one-time, yours forever • Automatic calendar switching — say "Meeting Work 10am" and it lands in your Work calendar. • Pick any calendar per event. • Large home-screen widget. • Cross-calendar conflict detection — a heads-up before you double-book. PRIVACY-FIRST Zapp runs entirely on your iPhone. Your text never leaves the device. No servers, no accounts, no tracking. Your calendar stays yours. BUILT FOR iPHONE Home-screen widget for today's agenda. Share extension: send text from Mail, Safari, or Notes straight into Zapp. Direct EventKit integration with Apple Calendar — the calendar you already trust. ——— Terms of Use: https://zappcalendar.app/en/terms.html Privacy Policy: https://zappcalendar.app/en/privacy.html Support: hello@zappcalendar.app

Screenshots

Strflow4 screens
Zapp Calendar4 screens

Verdict

The call

The clearest difference is update cadence: Zapp Calendar at every 5 days against Strflow's fortnightly. Strflow's advantage is device support (3 vs 1) and iOS requirement (18.0 vs 26.2). On price, ads and in-app purchases 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. Strflow sells 4 in-app purchases, starting at $1.49 per month and Zapp Calendar sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Strflow ships an update fortnightly, Zapp Calendar every 5 days. The most recent releases landed on October 20, 2026 and October 8, 2026 respectively.

Scorecard3 real differences · 7 level
Strflow versus Zapp Calendar: the parameters behind the verdict, then further details
ParameterStrflowZapp Calendar
PriceFreeFree
Rating5.0 (50 ratings) — better—
Positive reviews97.1% of reviews—
Number of ratings50 — better—
Update frequencyFortnightlyEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPad, Mac — betteriPhone
Requires iOS18.0 — better26.2
Further details — not scored
Size73 MB3 MB
Age rating4+4+
DeveloperShingo EguchiMichael Becker

In-app purchases

4 purchases

Strflow

Subscriptions2
  • Strflow Plus (Monthly)7 Days trial$1.491 Month
  • Strflow Plus (Annual)14 Days trial$14.991 Year
One-time2
  • Strflow Plus (Lifetime, Subscriber)$27.99
  • Strflow Plus (Lifetime)$37.99
1 purchases

Zapp Calendar

One-time1
  • Zapp Pro$4.99

Questions

Is Strflow free?
Strflow is free to download, with in-app purchases available.
Is Zapp Calendar free?
Zapp Calendar is free to download, with in-app purchases available.
Do Strflow or Zapp Calendar have ads?
Neither Strflow nor Zapp Calendar shows ads.
Which is updated more often, Strflow or Zapp Calendar?
Strflow ships an update fortnightly, and Zapp Calendar every 5 days. Most recently, Strflow was updated on October 20, 2026 and Zapp Calendar on October 8, 2026.

Other comparisons