What is Flask?
Flask, styled Flask Lists on its site, is a free to-do list app that runs in the browser. A list can be created and filled in without an account, and it is shared by copying its URL, with no invitations or permission settings. Signing up is only needed to save more than one list. The site lists no paid plan and takes donations through a Buy Me a Coffee link.
Flask is free to use. See every plan
Good for
- A quick shared list with no accounts or setup
- Shopping, packing and wish lists passed around as a link
- People who want a to-do list with very few features
Worth knowing
- Sharing has no permission settings: a list is shared by its URL, with no invites.
- It is browser only. The About page asks developers who want to help build a mobile app to get in touch, and no native apps are offered.
- The terms of use mention a paid PRO account, but the /pro page they point to returns a not-found page and the site lists no paid plan.
- API access is given on request by email; the site has no public API documentation.
Key features
- No sign-up to start
- A new list opens straight from the homepage and tasks can be added at once. An account is only needed to save and manage more than one list.
- Sharing by URL
- Each list has its own address, and copying that address is the whole sharing step. There are no permissions and no formal invites.
- Task basics
- Tasks can be added, edited, reordered, checked off and deleted, starred, and tagged with colors.
- Email and embed
- The changelog on the About page lists emailing a list and embedding a list among the features added in 2013.
- Any device with a browser
- The app is browser based with a responsive design for phones, so there is nothing to install and lists are the same on every device.
- API on request
- The About page offers developers access to an API by email, for uses such as adding to-do lists to another product.
Flask pricing
- Starts at
- Free
- Free plan
- The whole app is free. A list can be made without an account; a free sign-up is only needed to save more than one list.
- Free trial
- None listed
| Plan | Price | What you get |
|---|---|---|
| Free | $0 | Every feature of the web app. The site lists no paid plan and has a Buy Me a Coffee link for donations. |
Read from flask.io on Oct 9, 2026. Prices change, so confirm with Flask before you buy.
Flask alternatives
- Flask vs Checkli
Free plan · from $29/mo
- Flask vs WeDo
Free plan · from $5.99/mo
- Flask vs Google Tasks
Free plan · from $7/mo
Common questions
Is Flask free?
Yes. Flask is free to use. The whole app is free. A list can be made without an account; a free sign-up is only needed to save more than one list.
How much does Flask cost?
Flask lists one plan. Free: $0. Prices were read from flask.io on Oct 9, 2026.
What platforms does Flask work on?
Flask is available on Web.
Does Flask have an Android app?
No Android app was listed when its pages were read on Oct 9, 2026. Flask is listed for Web.
Does Flask have an iPhone app?
No iPhone app was listed when its pages were read on Oct 9, 2026. Flask is listed for Web.
Is Flask open source?
Flask is not described as open source on its own site, as read on Oct 9, 2026.
Does Flask have an API?
Yes. Flask offers a public API, according to its own site.
Who makes Flask?
Flask is made by NewVariable Digital Solutions Private Limited. It dates from 2013.
What are the alternatives to Flask?
The closest alternatives to Flask in our directory are Checkli, WeDo, Microsoft To Do and Google Tasks. Each one has a side-by-side comparison with Flask.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Oct 9, 2026.