Infinite-canvas flowcharts, drag-and-drop wireframes for web and mobile, a rich notes editor, a JSON power-tool, a configurable tray launcher, and a whole extensions marketplace — in a single native app. Free, private, and yours to keep.
macOS, Windows (x64 & ARM64) · 122–130 MB on macOS · Linux still on the way
ReplacesMiroFigmaPostmanNotionJSONFormatter
Home
One window. Every tool a keypress away.
Flowcharts
Infinite-canvas diagramming with pan, zoom and templates.
Drag & drop shapes
Drop in pre-built nodes and connect with labeled arrows.
Mermaid code view
Flip any diagram to code and edit as text.
Web wireframes
1440×900 browser frame with a catalog of UI elements.
Mobile wireframes
375×812 phone frame for multi-screen app flows.
Notes editor
Rich text, Markdown preview and inline Mermaid diagrams.
JSON inspector
Collapsible tree view + type generation in 7 languages.
Dev news feed
Top dev.to articles, filterable by tag, bookmarkable.
Tray launcher
Pin URLs, terminal commands and scripts into your menu bar.
Extensions marketplace
Install first-party & community extensions, all AI safety-reviewed.
Apily REST client
A Postman-class extension that ships with DevHelper.
Why DevHelper
One app. Your whole dev side-stack.
Stop paying monthly for tools you open twice a week. DevHelper bundles the essentials into a single native app that runs on your machine.
5
Built-in tools
8
First-party extensions
100%
Local by default
$0
Forever. No seats.
Free forever
No trials, no feature paywalls, no seat pricing, no "upgrade for AI" upsells. Every tool, every template, every extension is unlocked from day one — forever.
Local-first & private
Every note, flowchart and wireframe lives on your disk in open formats. Works fully offline, zero telemetry by default, and your data never leaves your machine unless you opt in.
Replaces the SaaS stack
Miro, Figma, Postman, Notion, JSONFormatter, bookmark managers, scratchpads — consolidated into one fast, native app that lives quietly in your menu bar and is always a keypress away.
Features
Everything you reach for, in one window.
Built for developers, designers and makers who want their tools to feel like one coherent workspace — not a dozen browser tabs.
Miro replacement
Flowcharts with an infinite canvas
Diagram systems, architect APIs and map user flows on a zoomable infinite canvas. Drop in pre-built shapes, connect them with labeled arrows, group related nodes into sub-groups, or flip to a code view and edit the diagram as Mermaid text. Start from a ready-made template, then export as PNG or SVG — or copy straight to the clipboard.
Two purpose-built canvases — web (1440×900 browser frame) and mobile (375×812 phone frame) — each with a catalog of UI elements across Navigation, Inputs, Content and Website categories. Drag them onto the canvas, snap into place, group, duplicate and build out multiple screens per file.
Web canvasMobile canvasDrag & drop componentsSnappingMulti-screen filesGrouping & duplicationUndo / redoPNG export
Notion replacement
A rich notes editor with Markdown & diagrams
A full rich-text editor with a live Markdown preview, tab-based notebooks, inline images, and Mermaid diagrams rendered right inside your notes. Export any note to PDF when you need to share it.
Rich text editorMarkdown previewMermaid diagramsInline imagesMulti-tab notebooksPDF export
JSONFormatter replacement
JSON inspector & type generator
Paste JSON with Cmd/Ctrl+V and get an instant collapsible tree view. One click generates strongly-typed models in seven languages — TypeScript, Swift, Kotlin, Python, Java, Dart and C# — ready to drop into your project. Keep multiple payloads side-by-side in tabs.
Collapsible tree viewPaste & goTypeScriptSwiftKotlinPythonJavaDartC#Multi-tab
Curated
Dev news feed
A built-in reader pulling the top dev.to articles straight into the app. Filter by tag (JavaScript, TypeScript, React, webdev, and your own custom tags), search by keyword, and bookmark articles to read later — without juggling yet another browser tab.
dev.to top articlesTag filtersCustom tagsKeyword searchBookmarks
Configurable tray launcher
Tired of bookmarking everything?
Stop hunting for that one URL you saved somewhere and scrolling past 300 Chrome tabs. Pin your most-used URLs, terminal commands and scripts right into the menu bar, organize them into nested submenus — accessible from anywhere, without focusing Chrome or opening Notes. Run any extension from the tray too.
Install first-party and community extensions from the built-in store — every one of them is scanned by an AI safety review before it goes live, and you can build your own with a simple, documented API.
Apily — Postman-class REST clientCommandly — terminals & scriptsClipboard Manager — copy historyQuick Notes — on-disk editorNetwork Info — IPs & systemStorage Cleaner — find big filesStopwatch — always-on-top timerURL Launcher — tray bookmarksAI safety-reviewedBuild your own via API
Built for power users
Local by default. Cloud when you want it.
DevHelper puts you in charge of your data and your updates.
Local-only, private by default
All your notes, flowcharts and wireframes sit on your disk in open file formats you can read with any editor. Fully functional offline on a plane, in a tunnel, or behind a corporate firewall — no telemetry, no forced accounts, no "enable cookies to continue".
100% offlineOpen file formatsZero telemetry
Optional cloud backup & sync — account required
Create a free account and sign in to back up your full workspace to our servers and sync seamlessly across machines. Roll back to any previous backup, restore to a fresh install in seconds, and sign out anytime — when you are not logged in, DevHelper falls back to local-only offline backups and data storage on your disk, and your local copy is always the source of truth.
Free account requiredOffline backups when signed outPoint-in-time restoreMulti-device sync
Automatic OTA updates
Every release is signed with a Developer ID and notarized by Apple, then delivered to your installed app automatically. The app checks on launch and every six hours after, shows a friendly "Update available" banner with a live download progress bar, and swaps in the new version on next relaunch — no manual downloads, no reinstalls, no "drag to Applications" again.
Signed & notarizedAuto-check every 6 hoursInstall on relaunch
Extendable — with a real SDK
Install community extensions from the in-app store, or build your own with a simple, documented API: HTTP, shell, filesystem, clipboard, notifications, system info and more. Every submitted extension is AI safety-reviewed before it ships to users.
Documented SDKAI safety reviewIn-app store
Download
Get DevHelper 2.0.5
Free and local-first on macOS and Windows. Linux is still on the way.
These builds are not code signed. Support (donations) helps us buy a Windows code-signing certificate so SmartScreen and installers can trust the app. For now, this is what we have—Windows may show a security prompt when you run the setup.
macOS updates are signed and notarized. Windows installers are unsigned for now; Linux is still in progress.
Why not the App Store?
We left the stores so DevHelper could stay useful.
DevHelper used to ship through the Mac App Store and Microsoft Store, but their Electron sandboxes block the things that make DevHelper actually useful — running shell commands from the tray, installing third-party extensions, reading and writing files outside the app container, and shipping our own auto-update pipeline.
So we moved to manual, signed & notarized distribution. You get every feature on day one, faster updates, and no 30% platform tax on a free app.
That said — if Buy Me a Coffee isn't your thing, grabbing the $1.99 build from either store is another way to support development. It goes to the same developer, and you can keep using the free manual build from this page afterwards with no feature locked behind a paywall.
Still prefer a store install?
The old 1.2.1 build is still listed for $1.99, but it's missing a lot of what's on this page:
DevHelper is free and maintained by one developer. If it saves you time — or a few SaaS subscriptions — fuel the next release, or reach out with feedback and bug reports.
Donors
Fuel the next release.
Every coffee goes straight into new features, new platforms and new extensions. Windows and Linux builds are funded this way, and every contribution keeps DevHelper free forever for everyone.
Not comfortable donating through Buy Me a Coffee? Buying the $1.99 build on the Mac App Store or Microsoft Store counts too — it goes to the same developer. You can keep using the free manual build from this page afterwards; it's the full version, with not a single feature locked behind a paywall.
Found a bug? Want a feature? Building an extension and stuck on the API? Drop a line — every message is read, and real feedback shapes the next release faster than anything else.
