ChatGPT desktop app, including Codex
Free, Go, Plus and Pro tiers · macOS 14+, Apple Silicon or Intel, plus Windows, web, iOS and Android · cloud
Frontier-scale capability, far beyond anything that fits in 16 GB of local memory. Codex is a mature agentic coder: it edits files and runs commands on your machine while the model stays remote, with a default of workspace-write and on-request approval, enforced on macOS by Apple's Seatbelt sandbox, no network access by default and writes limited to the active workspace. Separately, Work with Apps can read and edit inside coding apps, producing a diff you review, so you keep your own editor. It runs on Intel Macs and syncs across Windows, web and phones.
The difference from Kynd is where the thinking happens and what happens to it afterwards. OpenAI's own help page says ChatGPT “improves by further training on the conversations people have with it, unless you opt out”, and the pricing table's privacy row reads “Content is used to train our models — Opt-out available” for Free, Go, Plus and Pro alike. OpenAI also notes that Codex has separate controls for training on full environments, and that “adjusting your settings in the ChatGPT interface or privacy portal will not affect these full-environment Codex settings”. Codex is not selectable on web or mobile, and Work with Apps needs macOS Accessibility permission, with an extension on top for VS Code. On price: OpenAI's pricing page renders its figures in the visitor's own currency and they did not appear when the page was read on 31 July 2026, so no ChatGPT price is quoted here. The tier names are verified, and the Go plan carries the note “This plan may include ads”.
Claude desktop app, including Claude Code and Cowork
Free $0; Pro $20/mo or $17/mo annually; Max from $100/mo · macOS 11+, Windows, Linux in beta · cloud model, local execution
This is the closest direct competitor to Kynd's builder role, and it is ahead in several respects: visual diff review, an integrated terminal, a file editor, live app preview, parallel sessions each in its own git worktree, GitHub pull-request monitoring, scheduled tasks, plugins and MCP. The desktop app bundles Claude Code, so there is no Node or CLI install — download, sign in, click the Code tab, pick a folder. The default Manual permission mode means it proposes and waits: files are not modified until you accept. Cowork runs an agent in a VM and works across Word, PDF, spreadsheet, presentation, image, code, Jupyter and structured-data files, and can keep going with the laptop closed.
On privacy this is the best default of the four cloud vendors here, and it deserves saying plainly: training is opt-in. Your data is used only if you choose to allow chats and coding sessions to improve Claude, and incognito chats are never used even when that setting is on. The honest caveats are that conversations flagged for safety review may still be used or analysed regardless of the setting, and conversations with feedback attached are retained for up to five years. Against Kynd, the differences are structural rather than moral: inference is in the cloud, an account is mandatory, there is no offline mode, and the coding agent sits behind a subscription from $20 a month — roughly five months to break even against Kynd's $79 founding price (then $149). The Free tier is chat only, with no file access. There is no on-device voice or voice cloning documented in the desktop app, and no offline knowledge library over your own files.
Gemini app for macOS, including Gemini Spark
App is free; paid tiers not priced here · macOS 15+, Apple Silicon, 8 GB RAM, 200 MB disk · cloud
The easiest of the four to start with: download, sign in with a Google account, done. It has the smallest footprint on this page by a wide margin — 200 MB of disk and 8 GB of RAM, against Kynd's 919 MB download plus a multi-gigabyte model and a 16 GB floor. System-wide dictation types polished text straight at your cursor in any app, which is an OS-level integration Kynd does not match, and screen sharing lets you show it any window and ask about exactly what is on it. Higher tiers bundle real money in non-AI value such as cloud storage and YouTube Premium.
Google states that “a stable internet connection is required to use Gemini's features”, and nothing in the Mac app is documented as running on-device. On data, Google's help pages say it “uses your activity to provide, develop, and improve its services (including training generative AI models)”. Rather than characterise the default state of the Keep Activity setting, which Google does not spell out, here are the retention periods it does document: saved activity “is auto-deleted after 18 months” by default; chats seen by human reviewers “are retained for up to three years”; and “temporary chats and chats you have when Keep Activity is off are retained with your account for 72 hours”. Two other practical notes. Gemini's Mac app needs macOS 15 or later and Apple Silicon, which is a narrower window than Kynd's macOS 13 and up. And the only part that touches files on disk is Gemini Spark, which is gated to the top Google AI Ultra tier and which only reaches the specific directories you explicitly connect; at last check it was US-only and in beta. Google's subscription prices are shown in the visitor's local currency, so none are quoted here.
Perplexity Personal Computer for Mac, including the Comet browser
Free to download; Computer credits tied to a paid plan · macOS 14+, Mac only · cloud intelligence, cloud sandbox
The most ambitious automation story on this page. Connect any folder and Computer can read, write and search your files directly. It also drives native apps — Mail, Finder, Slack, Messages, Notes — and can control the Comet browser for web work, which is something Kynd does not attempt at all. It orchestrates teams of agents across more than twenty frontier models, chosen per task, with more than 400 app connectors and a voice mode that acts on your Mac. On a spare Mac mini it runs around the clock and keeps working with your laptop closed, steerable from your phone. Comet itself is a full Chromium-based browser on Mac, Windows, iOS and Android.
The privacy shape is the inverse of Kynd's: your files and personal context are orchestrated in a sandbox on Perplexity's servers, and the agent leans on third-party frontier models. Perplexity's help centre states that “for Free, Perplexity Pro and Perplexity Max users, AI Data Retention is enabled by default”, and that opting out is not retroactive — “opt-outs only apply to data collected after the opt-out date” and “previously collected training data cannot be deleted or removed”. Perplexity Enterprise is explicitly excluded from that: enterprise data is never used for AI training. Meaningful use of Computer requires paid credits, and the Free plan shows none. Perplexity's pricing page blocks automated reading and its current subscription figures could not be re-verified on 31 July 2026, so no figures are quoted here. There is also no agentic software builder in Kynd's sense: no project templates, code editor, live preview or visual page editor are documented.