GlossPage: AI Bilingual Side-by-Side Translation for Comics, Books and PDFs
GlossPage redefines translation reading with bilingual side-by-side layout and system-level text capture.
GlossPage is an iOS translation tool centered on reading original and translated text side by side for comics, books, PDFs and photos. It uses OCR plus machine translation and can capture non-copyable text in any app via Back Tap or the Action Button. Developed by Gleb Radchenko and iOS-only, its engine details and real-world quality remain unverified.
A Translation Tool That Makes Bilingual Reading Feel Natural
In a world already flooded with translation tools, most products still stick to a single model: input text, output translation. GlossPage, newly launched on Product Hunt, tries a different path: instead of translating for you, it lets you read the original and the translation side by side.
GlossPage's positioning is clear—translating comics, graphic novels, books, and PDF files. Its core idea is "Translate and Read," where translation and reading happen together. The product description says: "Read both languages together." This seemingly simple design choice actually addresses a real pain point for language learners and cross-language readers.
Currently the product has 12 upvotes on Product Hunt, ranking 19th for the day, and is listed under the iOS, Languages, and Books categories. Built by developer Gleb Radchenko, it is currently iOS-only. The numbers aren't impressive, but the problem it solves deserves a closer look.
Bilingual Side-by-Side: Smarter Than "Translate First, Read Later"
The workflow of traditional translation tools is: copy text → paste → read the translation. For an entire book or a full page of comics, this process is practically unworkable. GlossPage's approach presents the original and translation side by side, letting readers shift their gaze freely between the two languages—understanding the content while retaining a sense of the original text.
This design is particularly valuable for several groups. Language learners can reference their native language while reading foreign-language books without constantly looking up a dictionary; comic readers dealing with complex lettering layouts can reduce the cost of back-and-forth switching with bilingual comparison; and researchers who need to read foreign-language PDFs can quickly grasp information without losing the original context.
From a product logic standpoint, GlossPage redefines "translation" as part of the reading experience rather than a standalone tool action. This approach is uncommon among translation apps—most competitors emphasize translation speed and accuracy over the fluency of the reading experience.
System-Level Text Capture: Translating Even Non-Copyable Text
Another notable feature of GlossPage is system-level text capture. The product description mentions that users can capture and translate text in any app via Back Tap or the Action Button, including text that cannot be copied.
This means GlossPage isn't confined to its own app. When you see text in some app that you can't select—such as text in an image, protected content, or text in a game interface—GlossPage can capture and translate it through system shortcuts. For iPhone 15 Pro and later models, the Action Button provides a physical-button-level trigger; Back Tap is a more universally available accessibility solution.
This capability expands GlossPage from "a translation app" into "a layer of translation infrastructure." It doesn't require users to change their habits; instead, it embeds itself into existing workflows. For users who frequently handle foreign-language content across different apps, this low-friction capture method may matter more for retention than translation quality itself.
Back Tap is an accessibility feature introduced in iOS 14. Users can go to Settings > Accessibility > Touch > Back Tap and map a double-tap or triple-tap on the back of the phone to a system-level shortcut, such as taking a screenshot, opening Control Center, or running a Shortcut. It requires no physical button and works on all iPhones supporting iOS 14 or later.
The Action Button is the physical button that replaced the mute switch starting with the iPhone 15 Pro series. Users can long-press it to trigger custom actions, including running a Shortcut, opening the camera, or launching a translation app. Both mechanisms essentially expose third-party app features as system-level entry points through "Shortcuts," and GlossPage uses this mechanism to achieve cross-app text capture.
Photos, PDFs, and Comics: The Trade-offs of Multi-Format Coverage
According to the product description, GlossPage supports input formats including photos, books, comics, and PDFs. This combination covers most unstructured text reading scenarios, but it also hints at the product's technical path: relying on OCR (optical character recognition) plus machine translation rather than simple copy-and-paste.
Translating comics and photos is significantly harder than plain text. Comic text is embedded in artwork, with diverse fonts and irregular layouts, so OCR accuracy directly affects the final experience. PDFs face layout preservation issues—the translation must not break the original reading structure. By choosing "bilingual side-by-side" rather than "replacing the original," GlossPage somewhat sidesteps the complexity of layout reconstruction, but it also means the tool leans toward assisted reading rather than full localization.
Interestingly, public information does not disclose which translation engine or OCR solution GlossPage uses, and there is little user feedback to verify actual translation quality. A sample of 3 reviews and 12 upvotes is too small to judge the product's completeness in real-world scenarios.
OCR (optical character recognition) is the technology that converts text in images into editable, searchable text. In translation scenarios, OCR locates and extracts text regions from comic panels, photos, or PDF screenshots, then passes the results to a machine translation engine. Comic OCR is especially difficult because text often follows curved speech bubbles, uses stylized fonts, and has low contrast with the background—misrecognition directly leads to garbled translations.
Machine translation (MT) is typically handled through third-party APIs (such as Google Translate, DeepL, or LLM interfaces). If a product doesn't have its own engine, its translation quality, latency, and cost are all constrained by the supplier. GlossPage has not disclosed its specific approach, so the actual performance of its OCR and MT remains unknown.
A Small Product with Big Questions: Translation Quality and Ecosystem Barriers
GlossPage's product thinking is clear, but its challenges are equally obvious.
Translation quality is the lifeline of this kind of tool. Bilingual side-by-side reduces the damage of "translation errors"—readers can always refer back to the original—but it also raises the bar for accuracy, because any obvious mistranslation stands out sharply in side-by-side reading. If GlossPage doesn't have its own translation model and instead calls third-party APIs, its quality ceiling is locked in by the supplier.
Platform limitations are another variable. Being iOS-only means Android and desktop users are excluded. Back Tap and the Action Button are interactions unique to Apple's ecosystem, which is both a differentiation advantage and a ceiling on scale. For a product centered on "reading," the lack of a large-screen and desktop reading experience is a clear gap—reading PDFs and books on a phone is far less comfortable than on a tablet or computer.
Judging from the Product Hunt data, GlossPage is still in its early stages. 12 upvotes and 3 reviews indicate it has yet to attract broad attention, but that doesn't necessarily mean low product value—many utility products' PH performance doesn't correlate with long-term viability. The key question is: is bilingual side-by-side reading a need that's frequent enough and painful enough?
For language learners and cross-language content consumers, the answer may be yes. But this user group is relatively niche, and for GlossPage to break out of its niche positioning, it will need to keep investing in translation quality, format support, and platform coverage. What it shows now is a thoughtful starting point, not a mature answer.
One-line Summary
GlossPage redefines the translation reading experience with bilingual side-by-side layout and system-level text capture.
Paragraph Summary
GlossPage is an iOS translation tool built around "translation and reading in sync": it presents the original and translation side by side rather than replacing the original, serving language learners, comic readers, and researchers of foreign-language PDFs. It supports photos, books, comics, and PDFs, relies on OCR plus machine translation to handle unstructured text, and can capture non-copyable text in any app via Back Tap or the Action Button. Developed by Gleb Radchenko and currently iOS-only, it has not disclosed its translation engine or OCR solution; Product Hunt data is small and actual quality remains unverified. Its approach is clear, but it faces challenges around translation quality, platform limitations, and demand frequency.
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