--- title: Hypercritical: Hyperspace | daily.dev description: Hyperspace is a macOS app that reclaims disk space by finding files with identical contents and converting duplicates into APFS space-saving clones — without... canonical: https://daily.dev/posts/hypercritical-hyperspace-bkxaixwd2 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Hypercritical: Hyperspace | daily.dev og:description: Hyperspace is a macOS app that reclaims disk space by finding files with identical contents and converting duplicates into APFS space-saving clones — without... og:url: https://daily.dev/posts/hypercritical-hyperspace-bkxaixwd2 og:image: https://api.daily.dev/og/posts/bKxAiXwD2.png og:image:alt: Hypercritical: Hyperspace og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Hypercritical: Hyperspace **[Hacker News](https://daily.dev/sources/hn)** · 53 min read · 0 upvotes · 0 comments ## Summary Hyperspace is a macOS app that reclaims disk space by finding files with identical contents and converting duplicates into APFS space-saving clones — without deleting any files. Version 1.7.1 (released August 9, 2026) brings improved clone operation recovery and UI fixes, while 1.7 added major reliability improvements including better reclamation efficiency, resource fork verification, and numerous bug fixes. The app uses a three-step workflow: Scan, Review, and Reclaim. It computes MD5, SHA-1, and SHA-256 hashes to confirm file identity, only works on APFS volumes, and requires files to be readable, writable, and owned by the current user. Pricing includes one-time purchases (one month, one year, or lifetime) and auto-renewing subscriptions, with Family Sharing supported for the Lifetime Unlock and auto-renewing plans. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How does Hyperspace determine if two files are identical before cloning them on macOS? Hyperspace compares file sizes first — files must match exactly to the byte. It then reads every byte of each file's data and resource fork and computes three hashes using MD5, SHA-1, and SHA-256. All six hashes (three for data, three for resource fork) must match exactly for two files to be considered identical. Files with no resource fork cannot match files that have one. _Mac developers managing large duplicate datasets track tools like Hyperspace on daily.dev._ ### What are the limitations of APFS space-saving clones used by apps like Hyperspace? APFS space-saving clones only work on APFS volumes — macOS can read other formats but cloning is not supported there. Clones also cannot cross volume boundaries; all files being cloned must reside on the same volume. A single physical storage device can contain multiple volumes, so even files on the same physical drive may be ineligible if they are on different volumes. _Engineers working with macOS storage internals find APFS deep-dives like this on daily.dev._ ### Which Hyperspace purchase options support Family Sharing on Mac? Hyperspace's Lifetime Unlock, Monthly Subscription, and Annual Subscription support Family Sharing. The one-month and one-year one-time purchases do not support Family Sharing because Apple does not provide a way to enable Family Sharing for non-renewing subscriptions, which is how those two purchase types are implemented. _Developers choosing between Mac App Store pricing models find comparisons like this on daily.dev._ ## Community take How the wider developer community reacted, aggregated from 1 discussion and 84 comments across hackernews (as of 2026-08-11). **TL;DR:** The community is split between debating whether the freemium scan-then-pay model is a dark pattern and discussing the underlying APFS clone/CoW technology — with many noting that open-source CLI alternatives like jdupes or fdupes already exist for free. **Sentiment:** 35% positive · 40% mixed · 25% skeptical **The case for** - The try-before-you-buy model lets users verify actual space savings before committing to a purchase, which is fairer than paying blind. - APFS clones are a genuinely useful CoW feature — changes to one clone don't affect others, unlike symlinks or hard links. - Real-world results can be impressive, with at least one reported case of nearly 4 TB reclaimed in a single run. **The pushback** - Scanning can take significant time before the paywall appears, which some see as a manipulative use of sunk-cost psychology. - Free CLI alternatives (jdupes, fdupes) and even a quick AI-generated script can replicate the core functionality at no cost. - The paid nature of the app is buried several screens below the fold on the landing page, making it easy to miss upfront. - The concept is considered trivially simple by some developers — essentially a UI wrapper around a few syscalls. **By community** - hackernews (mixed): Lively debate over whether the freemium model is a dark pattern, alongside genuine technical interest in APFS CoW cloning and comparisons to free alternatives. **Hottest debate:** Whether allowing a full disk scan before revealing the paywall constitutes a dark pattern or a user-friendly try-before-you-buy model. **Open questions** - Are there comparable open-source or free alternatives that also use APFS clones (not just hard links) on macOS? - How does Hyperspace compare in price and features to competitors like DiskDedupe? - Could the same APFS clone approach be leveraged to speed up Docker layer extraction on macOS? **Highlights** > If anything, it's the opposite of a dark pattern: you get to see if it'll provide any value for you without paying a dime. It's a far better proposition than paying up only to find out that it won't free up any space for you. The linked site is very clear about how the pricing works. > — [guywithabike on hackernews · 1 comments](https://news.ycombinator.com/item?id=49253316) > No, I'm complaining that it doesn't ask me to pay before it takes my time to perform a complete scan of my disk (ideally before it even gives me a download of the app). We both know it does so intentionally, and we also know exactly what the intent is. > — [sssilver on hackernews · 2 comments](https://news.ycombinator.com/item?id=49253810) > No, this uses a feature of the macOS file system. From the FAQ: > Q: Are clone files the same thing as symbolic links or hard links? > A: No. Symbolic links (“symlinks”) and hard links are ways to make two entries in the file system that share the same data. This might sound like the same thing as the space-saving clones used by Hyperspace, but there’s one important difference. With symlinks and hard links, a change to one of the files affects all the files. > The space-saving clones made by Hyperspace are different. Changes to one clone file do not affect other files. Cloned files should look and behave exactly the same as they did before they were converted into clones. > — [\_diyar on hackernews · 1 comments](https://news.ycombinator.com/item?id=49253435) > It's amazing that this is a product. In an earlier job we used to ask how to do this (discovery phase of deduplication) in the first interview screening. Once you have that list, it's straightforward to make a few syscalls that make it happen. > — [teiferer on hackernews · 1 comments](https://news.ycombinator.com/item?id=49253863) > Or use jdupes > — [odo1242 on hackernews · 1 comments](https://news.ycombinator.com/item?id=49253960) **Source threads** - [hackernews](https://news.ycombinator.com/item?id=49252493) · 48 points · 84 comments ## Similar posts on daily.dev - [Claude Opus 4.7: What Changed for Developers](https://daily.dev/posts/claude-opus-4-7-what-changed-for-developers-wouo0bhoh) · SitePoint · 0 upvotes · 0 comments - [Anthropic releases Opus 4.5 with new Chrome and Excel integrations](https://daily.dev/posts/anthropic-releases-opus-4-5-with-new-chrome-and-excel-integrations-o27v4qrok) · TechCrunch · 3 upvotes · 0 comments --- Tags: [#mac](https://daily.dev/tags/mac) [View this post on daily.dev](https://daily.dev/posts/hypercritical-hyperspace-bkxaixwd2) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Hypercritical: Hyperspace","url":"https://daily.dev/posts/hypercritical-hyperspace-bkxaixwd2","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/hypercritical-hyperspace-bkxaixwd2"},"datePublished":"2026-08-11T04:38:23.973Z","dateModified":"2026-08-11T09:35:24.103Z","description":"Hyperspace is a macOS app that reclaims disk space by finding files with identical contents and converting duplicates into APFS space-saving clones — without...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/25a8cb1fbe1415632e10b4cd90f3fc8c?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/25a8cb1fbe1415632e10b4cd90f3fc8c?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Hacker News","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Hacker News","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/hn","url":"https://daily.dev/sources/hn"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/hypercritical-hyperspace-bkxaixwd2","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"mac","timeRequired":"PT53M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Hacker News","item":"https://daily.dev/sources/hn"},{"@type":"ListItem","position":3,"name":"Hypercritical: Hyperspace"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/hypercritical-hyperspace-bkxaixwd2#faq","mainEntity":[{"@type":"Question","name":"How does Hyperspace determine if two files are identical before cloning them on macOS?","acceptedAnswer":{"@type":"Answer","text":"Hyperspace compares file sizes first — files must match exactly to the byte. 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