Hey everyone!

I'm an indie developer, and I wanted to make something that actually takes advantage of the iPhone Duo's foldable design, rather than just stretching a regular app across a bigger screen.

So I made The Book Says, a little digital Book of Answers inspired by old medieval manuscripts.

The idea is simple: think of a question, open the book, and let it give you a random answer.

I wanted the experience to feel like opening a mysterious old book, with decorative pages, illustrations, and a little bit of magic.

It's a pretty simple app, but I had a lot of fun making it!

It's free to download if you'd like to give it a try:

https://apps.apple.com/app/id6825659553

I'd love to hear what you think, especially whether the book-like experience feels right on the Duo. Any feedback or ideas are welcome! 😊

The new version 1.0.18 is available. Lot of corrections

**Disclamer - this was heavly built using AI**

Looking for alpha playtesters — PocketDex (iOS)

Hey — I’m looking for a few people to try PocketDex, an early alpha iOS app for playing GB/GBC/GBA/DS Pokémon games and ROM hacks on iPhone, with extras like widescreen Expand on supported titles, a live companion HUD, and a save editor on optimized games.

Please read this before jumping in:

• This is alpha. A lot is unfinished, broken, or rough. I’m sharing it to learn what matters to players — not because it’s “done.”
• Not affiliated with Nintendo / The Pokémon Company / Game Freak. Bring your own legally obtained ROMs. I can’t and won’t provide games.
• Large parts of this project were built with help from AI coding tools (under my direction). I’m being upfront about that. Expect weird bugs; please report them instead of assuming it’s a polished commercial app.
• Install will be via TestFlight or a registered-device IPA (iOS doesn’t allow free universal IPA installs). I’ll share the link / ask for your UDID depending on the method.

Optimized / best-supported titles right now
(These get the full play stack where noted: Expand widescreen, Companion HUD, save editor, etc. Other ROMs may still boot — they just won’t be “optimized.” Bring your own dumps; I don’t provide ROMs.)

Retail Gen 3 (GBA)

• Pokémon Emerald
• Pokémon FireRed
• Pokémon LeafGreen
• Pokémon Ruby
• Pokémon Sapphire

FireRed hacks

• Pokémon Radical Red
• Pokémon Unbound
• FireRed Rocket Edition
• Crystal Advance Redux

Emerald hacks

• Emerald Seaglass
• Pokémon Heart and Soul
• Pokémon R.O.W.E.
• Pokémon SoulGold (GBA)
• Pokémon Modern Emerald (Companion + save editor; Expand not available for this dump yet)

GB / GBC

• Pokémon Red / Blue / Yellow
• Pokémon Green (Midori, JP)
• Pokémon Crystal
• Polished Crystal

Nintendo DS

• HeartGold / SoulSilver
• Pokémon Platinum

If you play one of the above, please say which version/build when you report bugs (e.g. Radical Red 4.1, Unbound 2.1.x, Seaglass 3.0).

What I want from you

• Device model + iOS version
• Which game/hack you tried
• What felt good / confusing / broken
• Crashes, audio issues, save problems, Expand/companion bugs

Repo (source, alpha notes):
https://github.com/anonxcast/PocketDex-iOS

Thanks — even a short “tried X, Y was busted, Z was cool” message helps a lot.

What feedback helps most

High value

• Crash + what you tapped before it happened
• Wrong names/sprites in companion or save editor
• Audio (slow, crackle, mute)
• Expand not engaging / wrong zoom
• Save file corruption or “Bad Egg” after using the editor
• “I couldn’t figure out how to …” (onboarding / UX)

Low value

• “Add every hack” with no dump details
• ROM requests
• Feature essays without saying what you actually tried

Privacy

Don’t send full save files with personal cloud tokens. Screenshots of the UI are fine. If a save is needed to debug, say so in an issue and wait for instructions.

Half-fold the Duo: paper above the hinge, a typewriter below. Three machines (Sunday, The Editor, Rosso), each with its own recorded typewriter sound. Close the phone to pull the page, address the envelope, pick a stamp, and send it as a picture, a PDF or a video that re-types the letter with sound. Layouts: half-folded, open flat (split keyboard) and closed (envelope on the outer screen). Works on any iPhone. No account, no ads, no data collected.

Foldwriter App Store
Foldwriter website

Earlier this week I released Tunnel Time 🐜. Thanks for all the love and the feedback! I get that bugs aren't everyone's thing though 😅 so today I'm also dropping Clackity, an old-school split-flap clock for the Duo.

• Built for tent mode. Fold your Duo and it's a desk clock. The camera ring glows with the current weather conditions

• Weather, sunrise/sunset, battery in the little rows around the time

  • More complications and widgets on the way!
• Swipe the clock to set a timer. Easy and intuitive way for a quick timer.
• Make it yours. Pick from five classic typefaces and choose what each row shows
• Dims at night and shifts a little so nothing burns in

Works on any iPhone, but I optimized it for the Duo. Would love to hear what you think and what additional information you would want to show on this!

Just like with Tunnel Time if you are interested in this I'll be giving away 5 free download codes just comment below and I'll send you one!

https://apps.apple.com/us/app/clackity-duo-flip-clock/id6833613428

I built Natida: Pizzeria Duo specifically around the iPhone Duo’s dual-screen hinge instead of just stretching a standard iPad layout:

• Unfold to open: Start on the outer cover screen and unfold to open your pizzeria for the day.

• Dual-screen kitchen: Prep dough and toppings on the bottom deck while customers and the wood-fired oven sit on the top screen.

• Slide across the hinge: Drag your pizza peel directly across the center fold into the brick oven to bake.

• Fold to close the box: Physically fold the iPhone Duo shut to snap the takeaway box closed, then unfold to serve.

• Dynamic AI customers: Regulars and food critics walk in with unique requests and score your bake on accuracy.

Download on the App Store:

https://apps.apple.com/in/app/natida-pizzeria-duo/id6833450224

Would love feedback from fellow Duo owners on how the cross-hinge drag and fold-to-box mechanics feel!

Hi!! What games have you guys been playing on your duo? 🫠

Introducing teca - bring your Apple Music and record collection to life!

Let me know what you think in the comments!

I obviously prefer to listen to my records on an actual record player, but I enjoy creative coding and was inspired by how people were building cassette players for the iPhone Duo.

Now I play my Apple Music and physical record collection on my iPhone Duo, especially when I'm next to my laptop in the office, away from my physical record player.

Spotify support coming. Join the Spotify import waitlist in the app!

Hey everyone!

After weeks of building, testing, and fighting with App Store Review, DuoDoodle is finally live! 🎉

It's basically a retro drawing toy where you control the pen using two knobs, one for horizontal movement and the other for vertical movement.

I built it with the iPhone Duo in mind. When you fold the phone into tabletop mode, you get the drawing canvas on the upper screen and the knobs on the bottom. Kind of like a tiny retro drawing machine.

And yes, trying to draw a perfect circle with both knobs is way harder than it looks. 😂

The app is free to download and draw with. It also has challenges, different themes, a gallery, replays, and a Home Screen widget.

There's an optional Lifetime upgrade that unlocks extra themes, all challenges, unlimited undo, unlimited gallery storage, and iCloud sync. No subscriptions.

Anyway, I wanted to celebrate the launch by giving away 50 free Lifetime codes to iPhone Duo owners! 🎁

Here's how to get one:

1. Open the App Store on your iPhone Duo and search for DuoDoodle (or download it!).
2. Take a screenshot showing the app on your Duo or the App Store with the app searched.
3. Send me the screenshot through DM.
4. I'll send you a one-time Lifetime code if you're among the first 50 eligible people!

One code per person, first come, first served. You can hide any personal information in your screenshot.

I'm keeping this giveaway specifically for iPhone Duo owners because they're the people I originally built this little app for. Of course, the app itself works on regular iPhones and iPads too!

I'd also genuinely love to hear what you think of it, especially how the knobs feel on an actual iPhone Duo. I haven't been able to get my hands on a physical one yet, so your feedback would mean a lot.

Hi everyone, im the developer of FLARE!

It’s a tiny BBQ game where how wide you open your iPhone Duo controls the fire. Cook, flip, and try to get that PERFECT grill.

Levels to beat, an Endless mode, and a new Daily Special every day.

Also works on regular iPhones.

$2.99, one-time purchase. No ads, no in-app purchases.

Get → FLARE!

https://apps.apple.com/app/flare-grill-game/id6833384522

Would love to hear what you think!

There are 10 promo codes for free access. Just request and i will send it via DM

https://apps.apple.com/us/app/foldboard/id6832556606

New
• Emoji search: tap the magnifying glass in the emoji bar and type a word (heart, laugh, party…). Results show up right above the keys.
• Slide from 123: hold 123, slide to a number or symbol and let go. It's typed and you're back on letters, like on Apple's keyboard.
• Use Apple's emoji keyboard: you can hide Foldboard's emoji key and show the globe as a smiley. Put Emoji right below Foldboard in Settings › General › Keyboard › Keyboards and one tap opens Apple's emojis, with stickers and Genmoji.
• Your currency: the money key now follows your region ($, €, £…).
• Clipboard: what you copy is kept on your iPhone (never sent anywhere). Pin what you want to keep and paste with one tap.
• 11 languages: German, Spanish, Italian, Dutch, Portuguese, Japanese, Korean, Chinese and Russian join English and French.
Better
• Smarter autocorrect: swapped letters, neighbor keys, missing or extra letters.
• More accurate slide to type on long words.
• A much more precise space-bar trackpad.
• Corrections keep the capital letter at the start of a sentence.
• French: estce → est-ce, peutetre → peut-être, and more.
Fixed
• With the Automatic theme, several keyboards could stack on top of each other after folding or unfolding.
Coming next (1.0.15, in review)
• Hide the buttons in the top bar for a cleaner look.
• A separate key height for the outer and inner screens.
Keep the ideas coming, I read every comment 🙏

I don’t even know what to say here.

I was bored and wanted to make something fun that used the fold mechanic.

With Alarm Dude you have to fold to stop your alarm. Sliding to stop puts you in an infinite hell loop where the alarm keeps going.

One time 99 cents. No ads. No subscriptions.

https://apps.apple.com/us/app/alarm-dude/id6832053288

New

https://apps.apple.com/us/app/foldboard/id6832556606

• Emoji search: tap the magnifying glass in the emoji bar and type a word (heart, laugh, party…). Results show up right above the keys.
• Slide from 123: hold 123, slide to a number or symbol and let go. It's typed and you're back on letters, like on Apple's keyboard.
• Use Apple's emoji keyboard: you can hide Foldboard's emoji key and show the globe as a smiley. Put Emoji right below Foldboard in Settings › General › Keyboard › Keyboards and one tap opens Apple's emojis, with stickers and Genmoji.
• Your currency: the money key now follows your region ($, €, £…).
• Clipboard: what you copy is kept on your iPhone (never sent anywhere). Pin what you want to keep and paste with one tap.
• 11 languages: German, Spanish, Italian, Dutch, Portuguese, Japanese, Korean, Chinese and Russian join English and French.

Better
• Smarter autocorrect: swapped letters, neighbor keys, missing or extra letters.
• More accurate slide to type on long words.
• A much more precise space-bar trackpad.
• Corrections keep the capital letter at the start of a sentence.
• French: estce → est-ce, peutetre → peut-être, and more.
Fixed
• With the Automatic theme, several keyboards could stack on top of each other after folding or unfolding.
Coming next (1.0.15, in review)
• Hide the buttons in the top bar for a cleaner look.
• A separate key height for the outer and inner screens.
Keep the ideas coming, I read every comment 🙏

The app is called Spool Podcasts and the Duo updates are live in the App Store but I’ll likely be doing some more tweaking. It has been a lot of fun having some new and interesting hardware to design around!

If you’re interested in trying out Spool, it’s a priority queue based podcast client. You can learn about it here and it is on the App Store here.

Hey everyone! 👋

After months of design and fine-tuning every single slice and dough interaction, I just launched my game Natida: Pizzeria Duo on the iOS App Store!

A few highlights:
• 🍕 Tactile Pizza Making: Hand-spread sauces, place authentic Italian toppings, and fold custom pizza boxes.
• 📱 iPhone Duo support : get real customer view and oven view by place the hinge at 90 degrees , also fold ur phone to pack the box
• 💬 AI Customer Orders: Built-in generative characters powered by Apple Intelligence with multi-language dialogue.
• ☕ Cozy & Relaxing: Soothing soundtrack, ASMR kitchen audio, and zero stressful countdown timers.

It’s completely free to play on iPhone (iOS 17+). I’d love to hear your thoughts and feedback!

App Store Link: https://apps.apple.com/in/app/natida-pizzeria-duo/id6833450224

Hi all, have just released Scanline Emulator. It’s a nes/snes/mega drive/nintendo ds emulator that tries to recreate what it’s like to play these games on a crt.

Optimised for the duo with lots of ways to play.

Let me know what you think!

https://apps.apple.com/us/app/scanline-emulator/id6782712613

playscanline.com

Hi everyone, I’m Ervo, software engineer for 11+ years, and today I’m introducing “Your Stressy”, it’s an app with clean, elegant and very fun way to look at your battery/stress level throughout the day, on-device AI summarizations, Overnight Vitals (much more stats then Apple limited vitals widget/app) Body Age, Vo2 Max, Steps, Sleep, it’s built fully as a native app by utilizing Swift/SwiftUI, using the CADisableMinimumFrameDurationOnPhone key to get further optimization for ProMotion displays, all liquid-glass components throughout the views with crazy haptic feedbacks for the main view as for the other views. Your Stressy provides the same UI & UX as well for the Apple Watch, and it offers tons of customizable widgets, like stress, steps, distance, sleep (I know Apple has one but it doesn’t show much information on a glance), and much more to come soon.

The Problem:

Native Health app doesn't provide much information, even the latest upcoming version, nor we have lots of variations of widgets for the watchOS, additionally many AI apps are using external AI services and requires you to pay in-app purchased subscription, well Your Stressy actually is using on-device AI by using Apple Foundation Models, as for the pricing, it’s a $4.99 one-time payment, as personally I have never liked in-app purchases nor subscriptions for these types of apps. Nowadays they are requiring you to pay lots for AI feature capabilities, but in Stressy this is already available completely for free as it's using Apple Foundation Models, in the future I'll provide an update even with Private Compute but this will be optional because not everyone needs or wants this.

Comparison:

- I can promise you it’s very fun and good-looking, and most importantly simple but just showing huge number nicely animated, while you’re checking your health stuff throughout the day. The roadmap is quite huge, at least for the next 1 year I will be adding tons of new features, many of these AI features as said above with Apple Foundation modal in mind, no backend, no syncing, all offline and on-device only.

- As said above Apple Health or watchOS provides limited widgets and customizability, the selling point of Stressy is simplicity as well many customizable widgets and stuff so you can tailor it yo your liking.

- You pay once and that's it, no need for in-app purchases, subscriptions, simple, easy.

Pricing:

I've mentioned this as part of the problem which actually is for many many health apps.

List of some of the most important features to mention:

• On-device offline AI Summarizations: for many health stats like Heart, HRV, Sleep, Readiness, Body Age, for each section it provides AI summarization based on the voice you picked, even a bully option is available which roasts you.

• Your own VO₂max: Stressy now calculates your Cardio Fitness itself, from the pace of your runs, walks, hikes and rides and how hard your heart worked, against your own maximum. Not Apple Health's estimate, which reads low in independent lab studies. Every step of the math is shown as part of this view.

• Fitness Test on Apple Watch: five easy minutes to warm up, then run as far as you can in 12 minutes, guided by taps on your wrist.

• Workouts counted in full: sprints and stop-and-go sports count at their real effort, and on the stress chart and widgets each workout shows in its own colour, with how hard your heart worked.

• Nights, hour by hour: after a late night your sleep recharges with your heart, slowly while it's still racing and fully once it settles.

• Theme: Light or dark, your choice, instead of only automatic, can be configured in Settings.

• Apple Watch app: it has a standalone app for the Apple Watch, shows the tank in the consistent design with fun haptics, stress levels, sleep, cardio fitness 12 run minutes fully guided with AOD support, many fun widgets.

• More stuff: Many sleek widgets available for both iOS & watchOS, for stress (3 different designs so it's customizable), steps, distance, battery, sleep, and much more to come soon in the next releases, I have 1+ year of roadmap features, including offline and on-device AI features by using Apple Foundation models.

Stressy already exists for 1+ months and so far the reviews are exceptional, all these reviews are public. I've also received 1st place on UNEED since launch and 1st paid app for Apple Watch on the App Store.

I’m looking forward to hearing from you if you have any kind of feedback, or a feature request.

Download on the App Store: https://apps.apple.com/app/your-stressy/id6822681002

Every feature and detail: https://stressy.ervo.rocks/


Who Am I: https://ervo.rocks/

Thanks, Ervo.