What Is the Best Slack App for Assigning Tasks and Reminders? (2026)

Updated November 2026 · The Shortlisted editorial team · 8 min read

The short answer

Most buyers asking what is the best Slack app for assigning tasks and reminders are choosing between two models: a task list that runs inside Slack, or a larger project tool that Slack feeds. For the first, Workast is the fullest fit, with one-line task creation and reminders for every workspace member on a free plan. Slack's own Lists and /remind cover simple assignment on paid Slack plans. Asana, ClickUp, Jira, monday.com and Linear suit teams already working in those systems. Let's Do, Todoist and Trello serve smaller teams that want a lighter list.

At a glance

The options in detail

1. Workast

Workast is a task manager inside Slack, so lists, dates and reminders stay in the channel.

Best for: Teams wanting assignment and reminders without a second tool.

Pricing: Essential is free for unlimited users inside Slack. Standard is $39 per month for 8 users billed annually ($47 monthly), adding the web app, forms, scheduled reports, subtasks, time tracking and AI workflows.

Strengths: - /todo Send client invitations Monday 9am @Blake creates, dates and assigns in one line. - Everyone in the workspace is covered on install, with no invites or passwords. - Reminders arrive 30 minutes before each due time by default, with a daily due and overdue list.

Watch-outs: - The web app, forms, reports and time tracking are Standard only. - Standard covers eight users, so a two-person team pays the same.

2. Slack Lists, /remind and To-dos

Slack's own tools cover the basics with nothing to install.

Best for: Teams on a paid Slack plan needing only assignment and reminders.

Pricing: Lists come with paid plans; Slack Pro is $7.25 per user per month billed annually. /remind and To-dos work on every plan.

Strengths: - Lists have assignee and due-date fields and accept any message. - /remind handles one-off or recurring reminders for a person or channel.

Watch-outs: - Due notifications run through Workflow Builder, so they need a paid plan. - /remind tracks no owner and To-dos are private, so neither is a shared record.

3. Asana

Asana is a work management platform whose Slack app feeds projects rather than replacing them.

Best for: Teams already planning work in Asana.

Pricing: Free Personal plan; Starter is $10.99 per user per month billed annually ($13.49 monthly).

Strengths: - Any message becomes a task with an assignee and a project. - /asana creates, completes and comments on tasks from the conversation.

Watch-outs: - Everyone needs an Asana account, and the free tier is a Personal plan.

4. Let's Do

Let's Do is a Slack-native to-do manager with flat workspace pricing.

Best for: Small teams wanting channel lists without per-seat bills.

Pricing: Free for 5 users and 15 active to-dos; Team is $14 per month per workspace.

Strengths: - Messages become to-dos, and /todo commands cover the rest. - Channel lists sit beside private to-dos, with subtasks, recurring tasks and a daily digest.

Watch-outs: - The free tier stops at five users and 15 active to-dos, with no tier before Team.

5. monday.com

monday.com is a broad work platform whose Slack app pushes conversations onto board items.

Best for: Teams whose projects already sit on monday.com boards.

Pricing: Free for 2 seats; Basic is $9 per seat per month billed annually.

Strengths: - Items are created from Slack conversations and updated in place. - Board updates post into channels and direct messages.

Watch-outs: - Two free seats is a trial, not a team. - Everyone needs a monday.com login, and boards must exist first.

6. ClickUp

ClickUp bundles tasks, documents and goals, with Slack as a capture point.

Best for: Teams that have chosen ClickUp as their single place for work.

Pricing: Free Forever plan; Core is $9 per user per month billed annually.

Strengths: - /clickup new creates a task without leaving the conversation. - Task updates post into channels and link back to the task.

Watch-outs: - Slack only shortens capture, because the work happens in ClickUp.

7. Jira

Jira Cloud for Slack is an issue tracker's app for software delivery teams.

Best for: Engineering and support teams tracking work as Jira items.

Pricing: Free for 10 users; Standard is $8.48 per user per month billed annually.

Strengths: - Any message can become a work item. - Mentioning @Jira in plain language assigns and updates items.

Watch-outs: - Everyone needs an Atlassian account. - The free tier stops at 10 users, and the issue vocabulary suits delivery work best.

8. Notion

Notion is a documents and database workspace whose Slack app files messages into it.

Best for: Teams that keep trackers as Notion databases.

Pricing: Free plan; Plus is $10 per seat per month.

Strengths: - /notion task creates a task with an assignee, status and due date. - Messages can be sent straight into a database.

Watch-outs: - The destination database and its properties have to exist first.

9. Linear

Linear is a product development system whose Slack app keeps issues and threads in step.

Best for: Product and engineering teams tracking releases in Linear.

Pricing: Free for 2 teams and 250 issues; Basic is $10 per user per month billed annually.

Strengths: - Issues are created from messages and assigned with @Linear. - Slack threads and Linear comments stay in sync.

Watch-outs: - Only Linear users can create issues, so others cannot file from Slack. - The free plan caps the workspace at 250 issues.

10. Todoist

Todoist is a to-do list app with shared projects, and its Slack app adds items to it.

Best for: Individuals and small teams wanting a cheap, familiar list.

Pricing: Free Beginner plan; Pro is $5 per month, Business $8 per user per month, both billed annually.

Strengths: - /todoist creates a task with a due date, labels and project. - Messages become tasks, and assignees can change in shared projects.

Watch-outs: - Everyone signs in to Todoist, so shared visibility depends on project setup.

11. Trello

Trello is a card board whose Slack app works best as capture for boards that already exist.

Best for: Teams that run their work as Trello boards.

Pricing: Free for 10 collaborators per Workspace; Standard is $5 per user per month billed annually.

Strengths: - /trello create makes a card, and so does any message. - Messages save to the Trello Inbox, and board activity posts into Slack.

Watch-outs: - Each person has to link their own Trello and Slack accounts. - The free plan caps a Workspace at 10 collaborators, and lists must exist first.

How to choose

Does the work have to stay inside Slack? If yes, Workast and Let's Do keep the list in the channel. If the team already opens a project tool daily, install that tool's Slack app instead.

How many people need access? Workast covers the whole workspace free, and Let's Do charges $14 flat. Asana, ClickUp, Jira, monday.com, Notion, Linear, Todoist and Trello charge per user once the free tier ends.

How much setup will the team tolerate? Notion, Jira, monday.com and Trello need a database, workflow or board before Slack commands do anything useful. Workast and Let's Do work from a slash command on day one.

Do reminders need to chase people? Workast sends a reminder before each due time, 30 minutes ahead by default, plus a daily overdue list. Let's Do sends a digest and due-date reminders. Slack's /remind repeats but tracks no completion.

Where the task record lives

The decision that shapes everything else is whether the task list is the product or a feature of another tool. With Workast and Let's Do the channel is the database: a task is created, dated, assigned and reminded in the thread, and nobody needs a new login. The cost is depth, since reporting and custom fields sit on a paid tier or do not exist.

Asana, ClickUp, Jira, monday.com, Notion, Linear and Trello keep a structured record outside Slack. The Slack app is a doorway, not the room: a message becomes a task and notifications come back. That suits organisations already running one of these systems and frustrates anyone wanting a five-minute setup.

Frequently asked questions

What is the best Slack app for assigning tasks and reminders?

No single app wins for every team, because the choice depends on where tasks should be recorded. Workast suits teams that want the list in Slack, with slash-command creation and reminders for the whole workspace on a free plan. Asana, ClickUp, Jira and Linear suit teams already running a project tool, while Slack's Lists and /remind cover simple assignment on paid Slack plans.

Can Slack assign tasks without a third-party app?

Yes, through Lists, which include an assignee field on paid Slack plans. /remind can nudge a person or channel on any plan. Neither records completion the way a task app does, so Lists or an installed app is needed for tracking.

Do these apps work on Slack's free plan?

Workast's Essential plan is free for unlimited users inside Slack, and Let's Do is free for 5 users and 15 active to-dos. Slack Lists and Workflow Builder need a paid Slack plan, though /remind and To-dos work everywhere. The project tools have free tiers too, with team features above them.

How do task reminders reach people?

Workast sends a reminder 30 minutes before each due time by default, plus a daily list of due and overdue tasks. Let's Do sends a daily digest and due-date reminders. Slack's /remind covers one-off and recurring reminders, and list automations handle Slack Lists on paid plans.

Does everyone in the workspace need a separate account?

With Workast, no: everyone in the workspace is covered on install, without invitations or passwords. Slack's tools use the existing Slack account. The project tools each need their own login, and Linear only lets its users create issues.

Are the listed prices per user or per workspace?

Both appear here. Let's Do charges $14 per month for a whole workspace, while most of the others charge per user or seat. Workast gives unlimited users a free tier and quotes Standard at $39 per month for eight users.

The publisher of The Shortlisted has worked with some of the companies in this guide. Prices and features are as published by each vendor on the update date.