Things 3 alternatives · To-Do Lists
Open-source alternatives to Things 3
Things 3 is not described as open source on its own site. 20 of the 79 other to-do list apps in this directory are open source, according to their own sites.
Things 3 is a paid product with a free trial, starting at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately. All of them are free or have a free plan.
20 tools · Listings checked up to Oct 9, 2026 · Where the facts come from
The 12 closest to Things 3
- Free
Planify
Free, open-source task manager for the Linux desktop
- Planify is free. Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- Planify has a free plan. Things 3 does not, though it has a free trial.
- Only Planify lists a Linux app.
- Only Things 3 lists macOS and iOS apps.
- Free plan · from $4.99/mo
Donetick
Open-source task and chore manager for households and groups
- Donetick starts at $4.99 per month, or $39.99 per year (Donetick Plus, US App Store). Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- Donetick has a free plan. Things 3 does not, though it has a free trial.
- Only Donetick lists a web app.
- Only Donetick lists an Android app.
- Free
sleek
Free, open-source todo.txt manager for Windows, macOS and Linux
- sleek is free. Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- sleek has a free plan. Things 3 does not, though it has a free trial.
- Only sleek lists Windows and Linux apps.
- Only Things 3 lists an iOS app.
- Free plan · from €4/mo
Vikunja
Open-source task manager to self-host or use as a paid cloud
- Vikunja starts at €4 per month, or €40 billed yearly (Vikunja Cloud Personal). Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- Vikunja has a free plan. Things 3 does not, though it has a free trial.
- Only Vikunja lists a web app.
- Only Vikunja lists Windows, Linux and Android apps.
- Free plan · from €5/mo
tududi
Open-source task and life organizer to self-host or use hosted
- tududi starts at €5 per person / month, or €50 per person / year (tududi Cloud). Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- tududi has a free plan. Things 3 does not, though it has a free trial.
- Only tududi lists a web app.
- Only Things 3 lists macOS and iOS apps.
- Free
Mindwtr
Free, open-source GTD task manager for desktop and mobile
- Mindwtr is free. Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- Mindwtr has a free plan. Things 3 does not, though it has a free trial.
- Only Mindwtr lists Windows, Linux and Android apps.
- Mindwtr is open source, according to its own site.
- Free
myTinyTodo
Small open-source to-do list script for your own web server
- myTinyTodo is free. Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- myTinyTodo has a free plan. Things 3 does not, though it has a free trial.
- Only myTinyTodo lists a web app.
- Only Things 3 lists macOS and iOS apps.
- Free plan · from $20/yr
HamsterBase Tasks
Open-source, local-first task manager with encrypted sync
- HamsterBase Tasks starts at $20 per year (Pro). Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- HamsterBase Tasks has a free plan. Things 3 does not, though it has a free trial.
- Only HamsterBase Tasks lists a web app.
- Only HamsterBase Tasks lists Windows, Linux and Android apps.
- Free
Super Productivity
Free, open-source to-do app with time tracking and a Pomodoro timer
- Super Productivity is free. Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- Super Productivity has a free plan. Things 3 does not, though it has a free trial.
- Only Super Productivity lists a web app.
- Only Super Productivity lists Windows, Linux and Android apps.
- Free plan · from $0.99/yr
Tasks.org
Open-source Android to-do list with CalDAV and Google Tasks sync
- Tasks.org starts at $0.99 per year (name-your-price subscription). Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- Tasks.org has a free plan. Things 3 does not, though it has a free trial.
- Only Tasks.org lists Android, Windows and Linux apps.
- Only Things 3 lists an iOS app.
- Free
Taskwarrior
Free, open-source to-do list manager for the command line
- Taskwarrior is free. Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- Taskwarrior has a free plan. Things 3 does not, though it has a free trial.
- Only Taskwarrior lists a Linux app.
- Only Things 3 lists an iOS app.
- Free
Todo.txt
Plain-text to-do list format with an open-source command-line tool
- Todo.txt is free. Things 3 starts at $9.99 one-time for iPhone; iPad $19.99 and Mac $49.99 are sold separately.
- Todo.txt has a free plan. Things 3 does not, though it has a free trial.
- Only Todo.txt lists Linux and Windows apps.
- Only Things 3 lists an iOS app.
8 more that are open source
All 20 in one tableCommon questions
Is there an open-source alternative to Things 3?
Yes. Planify, Donetick, sleek, Vikunja, tududi, Mindwtr, myTinyTodo, HamsterBase Tasks and 12 more are open source, according to their own sites.
Is Things 3 open source?
Things 3 is not described as open source on its own site. The listing was checked on Oct 4, 2026 against the pages it cites.
When was this checked?
Each listing shows its own date. On this page they run from Oct 4, 2026 to Oct 9, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.
This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Things 3: the alternatives its listing names first, then the tools that share the most features with it.