Serene

macOS focus sessions combining goals, timers, and distraction blocking

YES · focused build

🪦 Serene is no longer sold; sereneapp.com now redirects to its maker Venture Harbour. The verdict below is now a post-mortem.

price historical · $4/moestimated build time one sittingreplaced by 0 people

Serene's solo core is compact: build a local desktop utility that captures the essential focus planning workflow with keyboard-first controls and local storage. A competent builder can reach a useful personal version in one sitting, while the paid product mainly wins on polish, OS integration.

Build verification: not recorded. How we judge buildability

What you give up

  • polished shortcuts and accessibility
  • vendor-maintained updates
  • cross-device sync
  • deep operating-system edge-case coverage

Why people still pay

Serene: People keep paying because a utility used dozens of times a day must be instant, predictable, and compatible with every OS update.

Your build guide

The stack, security requirements, and agent rules for a focused replacement.

Before you start

  • Node and the Rust toolchain, a supported desktop build environment and an explicitly selected data folder. Remote sync is outside the initial scope.
  • Implementation components: Tauri, React and TypeScript for the desktop interface with a narrowly scoped Rust filesystem bridge. SQLite for structured state and search; user-owned files for original documents and attachments.
  • Scope boundary: polished shortcuts and accessibility; vendor-maintained updates
01
Tauri, React and TypeScript for the desktop interface with a narrowly scoped Rust filesystem bridge.
02
SQLite for structured state and search; user-owned files for original documents and attachments.
03
Domain model: daily objectives, focus tasks, session deadlines, allowed blocking actions and completion reflections
engineering roadmap

Implementation plan

1

Phase 1

Scope and fixtures. Implement this bounded workflow: Choose one daily objective, break it into focus sessions and run a calm timer with an optional reviewed distraction blocklist. Record the user's own end-of-session reflection without grading their productivity. Record prerequisites, select representative user-owned fixtures and document the unsupported features: polished shortcuts and accessibility; vendor-maintained updates

2

Phase 2

Durable model. Model daily objectives, focus tasks, session deadlines, allowed blocking actions and completion reflections Add migrations or a versioned document format, explicit validation, stable IDs and a visible import-error report. Preserve this rule: A cancelled session is not recorded as completed; blocking rules must be reversible and never prevent emergency exit.

3

Phase 3

Complete the first useful path. Implement the workflow's input, review and output interface, with clear controls and explicit empty/error states. Save edits atomically with stable IDs and revision history. Detect external file changes and offer a conflict copy instead of last-write-wins data loss.

4

Phase 4

Permissions and integration failure. Limit Tauri capabilities to selected folders and commands. Render imported content without executable HTML, and never expose arbitrary shell execution to the webview. Request integration credentials and permissions only for the enabled feature; show a disconnected state instead of mock results.

5

Phase 5

Portable handoff. Provide a portable folder export with a JSON manifest and original files. Restore to a separate folder; rebuild disposable indexes from sources. Include setup, operating limits, fixture walkthrough and shutdown/restart instructions in the README.

6

Phase 6

Acceptance scenarios. Restart during a session and recover its true deadline; ending early restores only the network/app rules that session added. Repeat the workflow after restart and with a denied permission or unavailable dependency; show recoverable failure rather than a success placeholder.

the pro prompt
download AGENTS.md
WORKING SLICE
Choose one daily objective, break it into focus sessions and run a calm timer with an optional reviewed distraction blocklist. Record the user's own end-of-session reflection without grading their productivity.

Build this scoped Serene-inspired workflow with a documented data model and visible failure states.

Architecture
- Tauri, React and TypeScript for the desktop interface with a narrowly scoped Rust filesystem bridge.
- SQLite for structured state and search; user-owned files for original documents and attachments.

Prerequisites and limits
Node and the Rust toolchain, a supported desktop build environment and an explicitly selected data folder. Remote sync is outside the initial scope.
Outside this release: polished shortcuts and accessibility; vendor-maintained updates

Data model and correctness
daily objectives, focus tasks, session deadlines, allowed blocking actions and completion reflections
Invariant: A cancelled session is not recorded as completed; blocking rules must be reversible and never prevent emergency exit.
Save edits atomically with stable IDs and revision history. Detect external file changes and offer a conflict copy instead of last-write-wins data loss.

Security and privacy
Limit Tauri capabilities to selected folders and commands. Render imported content without executable HTML, and never expose arbitrary shell execution to the webview.

Recovery and export
Provide a portable folder export with a JSON manifest and original files. Restore to a separate folder; rebuild disposable indexes from sources.

Implementation order
1. Phase 1 — Scope and fixtures. Implement this bounded workflow: Choose one daily objective, break it into focus sessions and run a calm timer with an optional reviewed distraction blocklist. Record the user's own end-of-session reflection without grading their productivity. Record prerequisites, select representative user-owned fixtures and document the unsupported features: polished shortcuts and accessibility; vendor-maintained updates
2. Phase 2 — Durable model. Model daily objectives, focus tasks, session deadlines, allowed blocking actions and completion reflections Add migrations or a versioned document format, explicit validation, stable IDs and a visible import-error report. Preserve this rule: A cancelled session is not recorded as completed; blocking rules must be reversible and never prevent emergency exit.
3. Phase 3 — Complete the first useful path. Implement the workflow's input, review and output interface, with clear controls and explicit empty/error states. Save edits atomically with stable IDs and revision history. Detect external file changes and offer a conflict copy instead of last-write-wins data loss.
4. Phase 4 — Permissions and integration failure. Limit Tauri capabilities to selected folders and commands. Render imported content without executable HTML, and never expose arbitrary shell execution to the webview. Request integration credentials and permissions only for the enabled feature; show a disconnected state instead of mock results.
5. Phase 5 — Portable handoff. Provide a portable folder export with a JSON manifest and original files. Restore to a separate folder; rebuild disposable indexes from sources. Include setup, operating limits, fixture walkthrough and shutdown/restart instructions in the README.
6. Phase 6 — Acceptance scenarios. Restart during a session and recover its true deadline; ending early restores only the network/app rules that session added. Repeat the workflow after restart and with a denied permission or unavailable dependency; show recoverable failure rather than a success placeholder.

Acceptance
Restart during a session and recover its true deadline; ending early restores only the network/app rules that session added.
Use real source data or clearly labeled fixtures. Explain unsupported input and provider failures; do not fabricate analytics, delivery receipts, accuracy claims or security guarantees.

Optional agent guidance
Optional external skill: [vercel-react-best-practices](https://github.com/vercel-labs/agent-skills/blob/main/skills/react-best-practices/SKILL.md) — Improve React and Next.js data fetching, rendering, bundle size and server performance. Review its instructions and compatibility before use; it does not grant deployment, data-access or publication permission.
Optional external skill: [web-design-guidelines](https://github.com/vercel-labs/agent-skills/blob/main/skills/web-design-guidelines/SKILL.md) — Review web interfaces for accessibility, keyboard focus, forms, navigation and interaction quality. Review its instructions and compatibility before use; it does not grant deployment, data-access or publication permission.
Optional external skill: [sharp-edges](https://github.com/trailofbits/skills/blob/main/plugins/sharp-edges/skills/sharp-edges/SKILL.md) — Review security-sensitive APIs and configuration for dangerous defaults and easy-to-misuse interfaces. Review its instructions and compatibility before use; it does not grant deployment, data-access or publication permission.
Project rule — data model: daily objectives, focus tasks, session deadlines, allowed blocking actions and completion reflections
Project rule — preserve this invariant: A cancelled session is not recorded as completed; blocking rules must be reversible and never prevent emergency exit.
Project rule — acceptance evidence: Restart during a session and recover its true deadline; ending early restores only the network/app rules that session added.

$ open in your agent (prompt prefilled, you press enter), copy the prompt or copy or download AGENTS.md · generated from this app's build plan

prior art · use these instead of building, if you'd ratherActivityWatchLocal-first automatic time tracking with an extensible event model.↗
share on X ↗

Questions about Serene

Can you build your own Serene with AI?

The verdict is yes for the scoped workflow. Serene's solo core is compact: build a local desktop utility that captures the essential focus planning workflow with keyboard-first controls and local storage. A competent builder can reach a useful personal version in one sitting, while the paid product mainly wins on polish, OS integration.

What does the Serene build prompt cover?

The prompt starts with this scope: Choose one daily objective, break it into focus sessions and run a calm timer with an optional reviewed distraction blocklist. Record the user's own end-of-session reflection without grading their productivity. Full-product capabilities excluded from the comparison include: polished shortcuts and accessibility; vendor-maintained updates; cross-device sync. Follow the implementation plan and its prerequisites before expanding the build.

How do I use the prompt, AGENTS.md and agent skills?

Start with the Serene prerequisites and stack, then copy the prompt into your coding agent. Save the project rules as AGENTS.md in the project root. Linked skills are optional packages or source instructions for specific tasks; review their current contents and install only those matching the chosen stack. A skill does not supply API credentials or verify the finished app.

How long will this Serene project take?

The catalogue estimate is one sitting for the limited scope. Setup, integration approvals, debugging, deployment and ongoing maintenance can add time. This is an estimate, not a delivery guarantee.

What would I give up by replacing Serene?

polished shortcuts and accessibility; vendor-maintained updates; cross-device sync; deep operating-system edge-case coverage. Serene: People keep paying because a utility used dozens of times a day must be instant, predictable, and compatible with every OS update.

What price is this guide comparing against?

The recorded Personal plan is $4/mo (per month billed annually), checked 2026-07-31. Serene is no longer sold; sereneapp.com now redirects to its maker Venture Harbour; this is historical pricing. Building your own also has hosting, API and maintenance costs; the recorded amount is not a guaranteed saving.

What can I use instead of building Serene?

The prior-art section lists ActivityWatch as starting points. Review their current scope, license and maintenance before adopting one.

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