A book cover on the outer screen of a foldable iPhone: how a reading app rode the iPhone Duo

Actually Read is a focused-reading app that launched in September. The same niche has a dozen similar products, most with only single-digit ratings. What pulled it out was a half-joking feature: when you read on the foldable iPhone Duo, the outer screen shows the book's cover, so from the outside the phone looks like an open book. The Duo went on sale in Oct 23, and this was one of the first apps creators and review articles used to demo what the outer screen can do. The pool is still small, though. What's worth learning is the playbook of riding new hardware. The product itself isn't worth copying.

A "book" on the subway

On the day the iPhone Duo went on sale in Oct 23, reading creator papernroses (410k followers) on TikTok posted a video captioned with one line: "well I had to try it lol, app is Actually Read!" In the shot she holds the Duo half-folded, with a full book cover facing outward. By Nov 6 the video had 136k views and 6,600 likes.

Six days later, tech blogger @jonathanjacobs_ posted "Performative reading mode on the iPhone Duo 😅" on Threads, which got 750k views and 32k likes. The developer replied: "Thank you for featuring my app!" In the UK's Independent review of the Duo, the author also wrote about reading on the subway with this mode on.

The feature is called Performative Mode, and the name is deliberate: there's a meme in English-speaking internet culture called "performative reading," which refers to reading in public to look the part. The developer's changelog says "Performative Mode with matcha optional :)", and matcha lattes are a standard prop in the meme too.

What it is

An iOS reading app, free to download, with an in-app purchase, Actually Read Plus, priced at $3.99 and $9.99 (App Store; I didn't check which billing period each corresponds to). It has four main features:

• Reader: imports EPUB and PDF, includes public-domain books, with highlights, bookmarks, and search;
• Reading log: tracks both e-books and paper books, and counts focus time;
• Blocking: starts a reading session and uses Apple's Screen Time to lock the apps and websites you choose;
• Ask the book: asks questions about the book you're reading; answers quote passages from the text, and you can tap to jump back to them. You can also limit answers to the parts you've already read to avoid spoilers. Indexing and search happen on-device. On Apple Intelligence-enabled devices, answers come from the on-device model for free, and only if you choose "Advanced AI" are questions and relevant excerpts sent to the cloud.

The developer, Prism32 LLC, is a small company registered 2023 years ago in Sacramento, California. Its other app is HookBook, a fertility-tracking app. Updates ship often, and by Nov 4 it had reached version 1.5.1.

Why it's trending now

Showed up early. Apple announced the Duo in Sep 9, and the app shipped in Sep 2 with the changelog line "Get ready for iPhone Duo." Almost every update since has focused on the Duo experience: Performative Mode, and "Improve iPhone Duo experience" has been revised several times.

A feature you get the moment you see it. The outer screen shows a book cover. No explanation needed, a three-second video makes the point, and it plugs straight into an existing meme. In the weeks after the Duo launched, tech and book creators were all looking for a clear example of what a foldable's two screens are good for, and this was it.

A clever workaround nobody else thought of. Normal apps can't show different content on the inner and outer screens of the Duo. Apple opened a camera accessory API, CameraCaptureAccessory, meant for things like showing a teleprompter to the person being filmed, as long as the app has a camera session running. Actually Read opened a tiny camera preview and used that opening to push the book cover to the outer screen (reported by Hong Kong's unwire.hk 10-25, paraphrasing the developer's post on r/iPhoneFold). The cost is that it needs camera permission and may drain more battery.

The inflection point shows in the numbers. Across all App Store regions, ratings totaled 46 in the first 8 weeks after launch; from Oct 28 to Nov 6, that rose by 41 over 9 days, to 87, roughly doubling the pace. The US store has 61 ratings at 4.9 stars. The Books free chart bounced between #107 and #145, with its best finish at #78 on Nov 1.

Where users come from

Nearly all of it is free exposure:

• Book and tech creators' trial videos. Besides papernroses, jackiesbooktally (62k followers) posted a "reading apps on the Duo" roundup in Oct 27 that got 141k views, along with a string of smaller accounts trying it out on their own. None of these videos are labeled as ads, so whether anyone was paid is unclear. The tone is consistent, too: "I came down to the outer screen specially to try this." One creator, anapearson_, put it bluntly: "I already have a Kindle and love paper books, I don't think I'll use it forever, but it's really cute."
• A seemingly official TikTok account. bing6j has just over 800 followers. Since Sep 10 it has kept posting #ActuallyRead, promoting only this app, with its top video at 37k views (likely run by the team itself; not verified).
• The developer posted on Reddit themselves, explaining how Performative Mode works, and tech outlets like unwire then rewrote it.
• Localized storefront. The listing is in 9 languages, with titles adapted by region; for example, the Traditional Chinese store calls it "Actually Read：專注閱讀". So it has appeared on the Books charts in 46 countries, but outside the US, ratings in each region are mostly 0 to 1. Rankings like #12 on Ghana's Books Top Grossing or #20 in Oman come from a few in-app purchases and don't say anything about revenue.

We found no discussion on Product Hunt, Hacker News, or X, and no evidence of paid ads.

Who it's competing with

Among the dozen or so new "focus reading" apps, it's already near the top, but it's still several orders of magnitude behind Opal and Goodreads. Copycats have already appeared: a duo-reading-app repo created on GitHub in Nov 5 has a PR that says outright, "This is how Actually Read's Performative Mode does it," copying the outer-screen cover. Duodecimo listed in Oct 22 and is also going after the "reading on the Duo" spot.

How long this heat lasts

Not for long. The Duo sells for $1,999, supply is limited, and few people see a book cover on the outer screen to begin with. The trick is already public, and any reading app could copy it. Between Nov 5 and 6, US ratings didn't rise at all. If Apple ever opens a proper outer-screen API, this workaround stops being special. How many users it keeps depends on how good the reader and book Q&A are. Rating 4.9; one user wrote, "I really hope it stays just like this," but the volume is too small to judge retention.

If it were you

Verdict: Don't copy the product, but do study the playbook. The focus-reading category is crowded, and everyone is stuck in single-digit ratings. What pushed this one up was a hardware launch. That window is now taken by it and a few copycats, and the Duo's user base is small.

Who it suits: indie iOS developers who move fast and watch Apple's new hardware and new APIs closely, and people who already have a decent app that lacks visibility.

Who it doesn't suit: people hoping to grow with "yet another focus-reading app"; and anyone wanting to compete head-on with it on the Duo outer-screen book cover. You're too late.

How to do it: apply this playbook to your own category. The Duo's outer screen is still empty in other contexts, such as workout timers, recipes, sheet music, or translated subtitles for the person across from you. Look for a use where "something on the outer screen that's instantly clear on camera" works (inferred; we didn't check whether anyone is doing these). The longer-term move is to watch for the next launch: list within a week of a new device or system API coming out, make the update notes clearly say it was built for that, and give the feature a name that connects to an internet meme. For AI features, copy its cost structure: local retrieval plus an on-device model for the free tier, with the cloud large model behind a subscription.

How to get users: during the launch and the weeks after, tech and niche creators look for demo material for new devices. Make your feature something they can film, and get it in front of them on launch day. Start a short-video account that only posts this one trick. Post on new-device communities like r/iPhoneFold and explain how you built it; tech outlets will pick it up.

When to move: for this Duo wave, aim to be in before the year-end shopping season ends. After the holidays, reviews of the new devices and "fun foldable apps" content dries up a lot. For the next hardware or API launch, the window is the week before and after.

Signs you've misjudged it: ① after the Duo buzz fades, its daily rating gains still hold at three to five or more, showing the reader itself retains users and brings in new ones, in which case this product might be worth a serious look; ② Apple opens a proper outer-screen API in a future iOS, so the "camera API workaround" stops being a barrier and the first-mover advantage shrinks faster than it does now; ③ a big account with an existing user base, like Readwise's Books, adds outer-screen book covers, showing this spot has been taken by a large company.