Open-Source Task Management App for Freelancers

There are plenty of open-source task management apps. There are also open-source time tracking tools and open-source invoice tools.

The awkward part for a freelancer is keeping three separate systems consistent.

A task says what you meant to do. A time entry says what happened. An expense records what it cost. An invoice turns selected work into a client document. If those records live in disconnected apps, the weekly admin does not disappear; it moves into copying, reconciling, and checking.

TaskTime Pro is an open-source task management app built around the whole freelancer workflow: projects, tasks, timers, expenses, invoices, and reports in one local-first PWA.

What to look for in open-source task management software

“Open source” answers an important question: can you inspect, run, modify, and contribute to the software under its license?

It does not answer every product question.

Before choosing an open-source task manager, also ask:

• Does it work for the way I organize client projects?
• Can tasks connect to actual time entries?
• Can I keep working offline?
• Is an account required for core use?
• Where is my work data stored?
• Can I export or back up the data?
• Does the tool also cover expenses, invoices, and reports?
• Can optional integrations be enabled without making them mandatory?
• If it supports AI agents, what can the agent access and approve?

TaskTime Pro’s source is public on GitHub under the AGPL-3.0-only license for the app and bridge. Its core app is free and does not require a TaskTime account or cloud sync.

Task management that reaches the invoice

TaskTime Pro organizes work through clients, projects, tasks, and subtasks. Projects can include notes, planning details, deadlines, budgets, task estimates, list or Kanban views, and weekly planner attachments.

That is the planning layer.

The same task can then anchor a timer. Stopping the timer creates a time entry tied to the task and project. Eligible unbilled time can later appear in an invoice preview and draft.

The result is a simple chain:

Client → Project → Task → Timer → Time entry → Invoice

Expenses can join the project and invoice workflow too. Reports can then summarize hours, invoices, payments, expenses, tax details, outstanding balances, and uninvoiced work from the same underlying records.

This is what makes “open source time tracking and invoicing” more than two features on a list. The records remain connected.

Local-first is not the same as self-hosted

People often search for open-source task management software because they want control over their data. Self-hosting is one way to get that control, but it is not the only architecture.

TaskTime Pro is local-first. The production app stores work records in the browser through IndexedDB and remains usable offline after the PWA is loaded or installed. You do not need to operate a task-management server for core use.

Optional Google Drive or Dropbox sync is available in manual, backup, and bidirectional modes. Routine sync files move directly between the browser and the selected provider; the TaskTime Pro sync service handles OAuth and short-lived token issuance rather than becoming the storage location for ordinary sync file contents.

TaskTime Pro does send limited aggregate usage metrics on the production origin, but not project, task, client, invoice, expense, note, or time-entry content.

That makes the tradeoff more precise:

• Open source lets you inspect and run the code.
• Local-first keeps the working copy on your device.
• Offline support keeps core work available without a network.
• Optional sync adds another device or backup path when you choose it.

If your requirement is specifically a multi-user, always-on, self-hosted server, TaskTime Pro may not be the shape you want. If you are a freelancer or solo professional who wants browser-local work management without running infrastructure, it may be a better fit.

An open-source AI task manager without a hidden data owner

TaskTime Pro also includes an optional same-device MCP bridge for AI agents.

An MCP-capable agent can use structured tools to help with:

• Projects, clients, tasks, and planner work
• Timers and time entries
• Expenses and recurring expenses
• Invoice previews and drafts
• Reports and exports
• Navigation to the right app screen

The bridge is open source, loopback-only, and requires explicit pairing in the visible TaskTime Pro app. It exposes business actions rather than raw browser storage. Permissions are divided into scopes, and sensitive billing, email, export, restore, and destructive actions require approval.

The agent is optional. TaskTime Pro does not bundle a model, require an AI subscription, or send the work ledger to a TaskTime-hosted AI service. You choose the compatible agent host and decide what access to grant.

For setup, use the TaskTime Pro MCP quickstart. There are also dedicated paths for Claude Code and OpenClaw.

A realistic open-source freelancer workflow

Imagine a small client project.

1. Create the client and project.
2. Break the deliverable into tasks and subtasks.
3. Plan the next task for this week.
4. Start its timer when work begins.
5. Stop the timer into a reviewable time entry.
6. Record a client-specific expense.
7. Find unbilled project work.
8. Preview and create an invoice draft.
9. Review, finalize, export, or send the invoice deliberately.
10. Use reports to check payment, expenses, and remaining uninvoiced work.

You can perform every step in the UI. If you pair an agent, it can help maintain the same workflow through structured tools.

That combination is useful for people searching for an AI task manager that is open source: the AI support is an interface to the app, not a replacement for a dependable record.

Why no-signup core use matters

A free task tracker often becomes less free when you need another project, more history, exports, or basic privacy.

TaskTime Pro’s core workflow does not require a TaskTime login. You can open the app, create projects and tasks, track time, add expenses, and work with invoices without first creating a vendor account.

That does not remove the need for your own backup habits. Browser-local data is still data you should protect. TaskTime Pro provides portable backup and optional cloud-sync modes so you can choose an appropriate recovery path.

For a shorter introduction, see a free task tracker that does not require sign-up and the guide to local-first software for freelancers.

Quick answers

Is TaskTime Pro an open-source task management app? Yes. The TaskTime Pro app and agent bridge source are public under AGPL-3.0-only.

Does it include open-source time tracking and invoicing? Yes. Tasks connect to project timers and time entries, while eligible tracked work and billable expenses can be used in invoice previews and drafts.

Do I need to self-host TaskTime Pro? No. Core use runs as a local-first browser PWA. Developers can also inspect and run the public source, but ordinary users do not need to operate a server.

Does it work offline? Yes, after the PWA is loaded or installed. Core work data is stored in the browser.

Does it require an account? No TaskTime account is required for core use. Optional integrations such as Google Drive or Dropbox have their own connection steps.

Can an AI agent manage TaskTime Pro? Yes, through the optional local MCP bridge after explicit same-device pairing. You choose the agent host, scopes, and approvals.

One open workflow instead of several disconnected tools

Open-source software is valuable because it gives users and contributors more visibility and control. For day-to-day freelance work, it also has to be practical.

TaskTime Pro keeps the chain from task to time, expense, invoice, and report in one place. It works without a TaskTime account, stays useful offline, and can optionally expose that same workflow to a locally paired AI agent.

That is the point: not open source as a badge, but an open-source task management app that can carry real work through to getting paid.