Lockoon vs Duet
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Lockoon
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Lock in on something for a set number of days, and watch a caterpillar become a butterfly as you do the work. Lockoon is a focus tracker for seasons, not forever. You choose what you will do, how long you will do it, and what counts as done. Then you tick things off each day, and the transformation moves through five stages: caterpillar, spinning, cocoon, emerging, butterfly. A SEASON ENDS A habit app that runs forever has no finish line. Lockoon gives you one. Either you reach your goal and collect a butterfly, or the days run out and you keep credit for what you actually did. Both go into your album. PERFECTION IS NOT THE BAR You decide what share of your scheduled steps counts as done β 80% by default. One bad week does not end a season. REST DAYS DO NOT BREAK STREAKS A goal can run every day, or only on the days you choose. A day that was never on the schedule never counts against you, and the consistency grid shows rest days as rest, not as misses. HOME SCREEN WIDGET Small, medium and large. Tick today's goals straight from the home screen without opening the app. Once everything due is done, the widget shows where your season stands instead β streak, steps against your goal, and the stage you have reached. ONE NOTE A DAY Leave a face β rough, okay or good β and a few lines about the day. Written once, then the day is closed. It is meant to capture how the day actually felt, not to be polished afterwards. YOUR HISTORY, YOURS Finished seasons are archived as butterflies, each in its own colour, with the numbers that produced it. Export everything as CSV or JSON whenever you like. EVERYTHING STAYS ON YOUR PHONE No account. No sign-up. Your goals, ticks and notes are stored only on your device and never uploaded. FREE AND PRO Lockoon is free for seasons of up to 9 days with one goal. Lockoon Pro unlocks seasons of any length up to a year and as many goals as you like, for one small payment a year. Pro renews automatically; cancel anytime in Settings βΊ Apple Account βΊ Subscriptions. Available in English, TΓΌrkΓ§e, EspaΓ±ol, Italiano and Ψ§ΩΨΉΨ±Ψ¨ΩΨ©. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Duet
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Read closed. Think open. Duet is a PDF reader for people who need to make sense of what they read. Highlight a passage and it becomes a card on a Canvas beside the page. Group your cards, connect them, add notes and questions, and work out what you think. Leave and come back later, and you're on the line you left. Now on iPhone, iPad and iPhone Duo. FREE TO START Your first two PDFs are free, each with its Canvas, Apple Pencil, private AI and the iPhone Duo layouts. No trial clock and no account. DUET PRO One purchase unlocks: β’ Unlimited PDFs, each with its own Canvas β’ All six themes β’ Home Screen and Lock Screen widgets Pay once and keep it. No subscription. Pro works on every iPhone, iPad and iPhone Duo signed in to the same Apple Account. THE CANVAS Every highlight arrives as a card, linked to its page. On the Canvas you can: β’ Clip passages straight from your PDF β’ Add sticky notes and text β’ Group and connect ideas with shapes and arrows β’ Lay out numbers in tables β’ Add photos from your library β’ Draw with your finger, or with Apple Pencil on iPad β’ Record voice notes, transcribed on your device so you can search them PRIVATE AI Ask about a passage, a card or a group of cards, and pin the answer to your Canvas. Answers come from your document and show the pages they came from. Duet uses Apple Intelligence on your device, so it works without internet, even on a flight, and your document stays with you. For bigger questions across a whole report, you can let Duet use Apple's Private Cloud Compute in Settings. It's only used when you're online. AI features need a device that supports Apple Intelligence. ON IPHONE DUO Read with the phone closed. Open it, and the page and its Canvas sit side by side. Half-folded like a book or flat on a table, the layout changes and every feature stays. Close it and you're back on the line you left. ON IPAD AND IPHONE iPad gives the Canvas the most room. Write and draw with Apple Pencil, and use Scribble to turn handwriting into text. On iPhone, the page and its Canvas are one tap apart. On iPad and iPhone Duo, open two reports side by side in Split View. WIDGETS (DUET PRO) For your Home Screen and Lock Screen: β’ Continue Reading opens the line you left. The larger sizes show your latest highlights too. β’ Recents shows your latest documents. β’ Latest Highlights shows recent passages from all your PDFs. SIX THEMES Ink & Paper is free. Studio Green, Studio Black, Tapestry, Cyanotype and Dawn come with Duet Pro. Each one changes the background, cards, highlight colour and app icon. YOUR LIBRARY Each PDF shows its page count and how many highlights you've made. Import from Files, Mail and Safari. Free to download. Duet Pro is a one-time in-app purchase. No subscription, no account, no ads. If anything's unclear, or something isn't working, get in touch: deepanshi@consciousengines.com Privacy Policy: https://duetreader.app/privacy Terms of Use: https://duetreader.app/terms
Screenshots
Verdict
The clearest difference is ads: Duet at none against Lockoon's shown. Lockoon's advantage is iOS requirement (16.4 vs 27.0). On price, update cadence, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Lockoon sells 1 in-app purchase, starting at $1.99 per year and Duet sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Lockoon ships an update every 3 weeks, Duet every 10 days. Both last shipped on November 10, 2026.
| Parameter | Lockoon | Duet |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 10 days β better |
| Ads | Yes | No β better |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad β better |
| Requires iOS | 16.4 β better | 27.0 |
| Further details β not scored | ||
| Size | 44 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Erdem Ege Eroglu | Conscious Engines |
In-app purchases
Lockoon
- Lockoon Pro$1.991 Year
Duet
- Duet Pro Lifetime$9.99








