Side-by-side comparison · Productivity & Notes
Calendly vs Slack vs Todoist
Everything that matters when choosing between them, in one place: our rating, what each can do, what they cost, and the trade-offs.
Comparing 3 tools, the maximum.
At a glance
Pick it if: Anyone who books calls with clients, prospects or candidates, from solo coaches to sales teams.
Pick it if: Teams that want one place to talk, and that lose time catching up on channels and hunting for old decisions.
Pick it if: Anyone who wants a dependable task list that is fast to use and stays out of the way.
Calendly scores highest overall, but Todoist gives you more for your money. Which one is right comes down to what you value most.
Overview
| Attribute | Calendly | Slack | Todoist |
|---|---|---|---|
| In one line | Share a link and let people book a meeting with you, with AI notes and email scheduling. | Team chat with AI built in: catch-up summaries, answers from your chats and Slackbot. | A simple to-do list that works everywhere and understands due dates like 'every Monday'. |
| Pricing model | Freemium | Freemium | Freemium |
| Starting price | $0 | $0 | $7/mo |
| Free plan | Yes | Yes | Yes |
| Works with Claude Code | Yes | Yes | Yes |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Calendly | Slack | Todoist |
|---|---|---|---|
| Overall rating | 4.5Winner | 4.0 | 4.3 |
| Ease of useHow quickly someone non-technical gets value from it. | 5.0 | 4.5 | 5.0 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 4.5 | 4.0 | 4.0 |
| Output qualityHow good the results are before you fix them. | 4.5 | 4.0 | 3.5 |
| Value for moneyWhat you get for the price, including the free plan. | 4.0 | 3.5 | 4.5 |
| Speed & reliabilityHow fast it is and how often it falls over. | 4.5 | 4.0 | 4.5 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Calendly | Slack | Todoist |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | Yes | Yes |
| Mobile app | Yes | Yes | Yes |
| Desktop app | No | Yes | Yes |
| Browser extension | Yes | No | Yes |
| API access | Yes | Yes | Yes |
| Teams & business | |||
| Team workspace | Yes | Yes | Yes |
| Enterprise plan or SSO | Yes | Yes | No |
| Connects to other apps | Yes | Yes | Yes |
| Open source or self-hosted | No | No | No |
| AI abilities | |||
| Works with your files | No | Yes | Yes |
| Understands images | – | – | No |
| Makes images | No | No | No |
| Makes video | No | No | No |
| Writes code | No | No | No |
| Runs agents or automations | Yes | Yes | No |
| Learns your brand or style | – | Yes | No |
| Works in many languages | No | Yes | Yes |
| Capabilities score | 8/ 17 | 11/ 17 | 9/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Calendly | Slack | Todoist |
|---|---|---|---|
| Plans | Free $0 Trying it out with one type of meeting. | Free $0 Small teams trying Slack. | Beginner Free Anyone with a simple list. |
StandardOur pick $10/seat/mo billed yearly ($12 monthly) Solo professionals booking clients. | Pro $7.25/user/mo billed yearly ($8.75 monthly) Small teams that want basic AI. | ProOur pick $7/mo, or $5/mo billed yearly Anyone who wants more projects and the calendar view. | |
Standard Plus $18/seat/mo billed yearly ($24 monthly) Solo professionals who want AI meeting notes. | Business+Our pick $15/user/mo billed yearly ($18 monthly) Teams that want the full AI set. | Business $10/user/mo, or $8/user/mo billed yearly Small teams sharing a workspace. | |
Teams $16/seat/mo billed yearly ($20 monthly) Sales and service teams sharing bookings. | Enterprise+ $45/user/mo billed yearly Large companies with many tools. | ||
Teams Plus $24/seat/mo billed yearly ($32 monthly) Teams that want AI notes on every call. | |||
Enterprise From $15,000/yr Large companies with 50+ seats. | |||
| Which plan to pick | Standard covers most solo businesses. Only pay for Standard Plus if you don't already use a meeting notetaker like Fathom or Granola. Move to Teams when more than one person takes bookings. | If your team already pays for Pro, try the basic AI first. Move to Business+ when you want AI search, the Slackbot agent and daily recaps, which is where the real time saving is. New teams get 50% off Pro or Business+ for 3 months if they upgrade in the first week. | Beginner is fine until you hit the five-project wall. Pro on the yearly plan is the obvious move after that. Business is for teams who want a shared space; it is not a substitute for a real project tool. |
Key features
| Attribute | Calendly | Slack | Todoist |
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Pros and cons
| Attribute | Calendly | Slack | Todoist |
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Who each one is for
| Attribute | Calendly | Slack | Todoist |
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Questions people ask
Which is better, Calendly, Slack or Todoist?
Calendly scores highest overall in our ratings (Calendly 4.5/5, Slack 4.0/5 and Todoist 4.3/5). Calendly is best for letting clients book calls without emailing back and forth and taking payment when someone books. Slack is best for catching up on busy channels after time off and finding past decisions in your team's messages. Todoist is best for personal task management and recurring reminders.
Which is cheaper, Calendly, Slack or Todoist?
Calendly: There's a free plan, and paid plans start at $0. Slack: There's a free plan, and paid plans start at $0. Todoist: There's a free plan, and paid plans start at $7/mo.
How we compare
Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability.
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