What to look for in a timezone Slack app
Not all timezone tools are built the same way. Before diving into the comparison, it helps to know what features actually matter for a distributed team working in Slack day to day.
Inline time conversion is the ability to automatically translate times mentioned in Slack messages so each person sees their local equivalent. This is the single most impactful feature because it works passively — nobody has to remember to use it. You just talk naturally and the tool does the math.
Meeting finder — a way to find overlapping working hours across multiple teammates, ideally without leaving Slack. The good ones let you tag people directly and get suggestions in seconds.
Team dashboard — a visual overview showing where everyone is, what time it is for them, and who's currently available. Useful for quick checks before pinging someone at what might be their midnight.
Setup friction matters more than people think. If the tool requires every team member to manually configure their timezone, adoption stalls. The best tools pull timezone data from Slack profiles automatically.
With those criteria in mind, let's look at the options.
1. Slack's built-in timezone features
Slack itself has a few timezone-aware features baked in. Every user's profile shows their local time and timezone. When you open someone's profile or hover over their name, you can see what time it is for them. Slack also lets you schedule messages for later, which is helpful for sending something during a colleague's working hours.
The Do Not Disturb schedule respects timezone settings too — if a teammate has DND active, Slack will warn you before sending a notification outside their hours.
These features are fine for basic awareness, but they're completely manual. There's no automatic time conversion in messages, no meeting finder, and no team-wide dashboard. You have to check each person's profile one by one, which doesn't scale past a handful of people.
- Already there — zero setup
- Profile local time is accurate
- Scheduled messages are handy
- No auto time conversion
- No meeting finder
- No team overview — check one profile at a time
2. Timezone Butler
Timezone Butler is an open-source Slack bot that translates relative time expressions (like "in 2 hours" or "tomorrow at 3pm") into each team member's local timezone. It delivers the conversion privately to each user, similar to how more full-featured tools work.
The appeal is simplicity: it's completely free, open-source, and does one thing. If all you need is basic time translation in Slack messages and you don't want to pay anything, Timezone Butler is a solid starting point.
The trade-off is that it's limited to time conversion and nothing else. There's no dashboard, no meeting finder, no visual team overview. It also handles fewer time formats than paid alternatives — if you write times in an unusual way, it might miss them.
- Free and open source
- Does auto time conversion privately
- Minimal — no bloat
- Time conversion only — no other features
- Limited time format recognition
- No dashboard or meeting finder
3. Spacetime
Spacetime takes a dashboard-first approach. Team members set their location and working hours, and the tool generates a visual overview showing everyone's local time, availability, and even weather. There's also a Slack bot — you can message it with a time and get conversions back.
The web dashboard is well-designed and gives a nice at-a-glance view of your team. The Pro plan adds features like grouping teammates into teams and setting different working hours for different days of the week.
The main weakness is that the Slack integration is secondary. The bot responds when you ask it directly, but it doesn't passively convert times in channel conversations. You have to go to the bot and ask. For teams that live in Slack, this extra step is friction — and friction means people won't use it consistently.
- Clean, visual web dashboard
- Shows weather + location context
- Free tier available
- No passive auto-conversion in channels
- Slack bot is query-based, not automatic
- Requires manual location setup per member
4. World Time Buddy
World Time Buddy is probably the most well-known timezone tool on the internet. It's a web app that lets you line up multiple cities side by side and visually scan for overlapping hours. You can drag a slider across the day and see corresponding times in each location. The free tier covers up to 4 locations, and the paid plan removes ads and adds more slots.
It's excellent at what it does — one-off timezone comparisons and finding meeting windows visually. Many people use it regularly and swear by it.
The limitation for Slack-first teams is that World Time Buddy is entirely separate from Slack. There's no Slack integration, no bot, no auto-conversion. Every time you need to check timezones, you leave Slack, open a browser tab, configure the cities, find the overlap, then go back to Slack to communicate the result. It works, but it's a workflow interruption that adds up across a team.
- Intuitive visual interface
- Great for one-off comparisons
- Well-known and reliable
- No Slack integration at all
- Requires context-switching every time
- Not team-aware — you enter cities, not teammates
5. Team TimeZone
Full disclosure: this is our product. We're including it because this is an honest comparison and we believe it fills gaps that the other tools don't — but we'll let you judge for yourself.
Team TimeZone is a Slack-native app that combines three things most other tools only do one of: automatic time conversion in channels, a slash-command meeting finder, and a full team dashboard.
The auto time conversion works passively. Once you invite the bot to a channel, any time mentioned in a message gets privately translated for each teammate into their local timezone. There's nothing to click or configure — it just works in the background. This is different from Timezone Butler's approach because it handles a wider range of time formats and from Spacetime because it doesn't require you to query the bot.
The meeting finder is a slash command: type /ttz find time for @teammate1 and @teammate2 and it returns suggested windows based on everyone's timezone and working hours. No browser tabs, no manual overlap calculation.
The dashboard offers timeline views, real-time presence tracking (who's online, in a meeting, or away), filtering by channel or group, and one-click contact via Slack DM, email, or phone. It also supports embedding in Notion and Confluence.
Setup takes under 10 seconds — click "Add to Slack," authorize, and it pulls timezone data from Slack profiles automatically. No manual configuration per team member. It also supports Slack Connect, so it works across organizations.
- Auto time conversion + meeting finder + dashboard
- Works passively in channels — zero friction
- 10-second setup, no per-member configuration
- Slack Connect support
- Paid (14-day free trial, from $9/mo)
- Slack-only — no standalone web app for non-Slack users
Side-by-side comparison
| Feature | Slack native | TZ Butler | Spacetime | WTB | Team TZ |
|---|---|---|---|---|---|
| Auto time conversion | ✕ | ✓ | ✕ | ✕ | ✓ |
| Meeting finder | ✕ | ✕ | ✕ | Visual | ✓ |
| Team dashboard | ✕ | ✕ | ✓ | ✕ | ✓ |
| Lives inside Slack | ✓ | ✓ | Bot only | ✕ | ✓ |
| Auto setup from profiles | ✓ | ✓ | ✕ | ✕ | ✓ |
| Slack Connect support | ✓ | ✕ | ✕ | ✕ | ✓ |
| Price | Free | Free | Freemium | Freemium | From $9/mo |
Which one should you pick?
It depends on what your team actually needs and what you're willing to spend.
If your team is small and in similar timezones, Slack's built-in features are probably enough. Check profiles before messaging and use scheduled send — that covers 80% of cases for a co-located-ish team.
If you want free auto time conversion and nothing else, Timezone Butler is a clean, no-nonsense choice. It's open source, it does the one thing well, and it costs nothing.
If you care most about a visual team dashboard and don't mind using a separate web app, Spacetime gives you a nice overview of your team across timezones with weather and location context.
If you're an individual who regularly needs to compare timezones outside of Slack, World Time Buddy has the most intuitive visual converter on the web.
If you want the whole package — auto conversion, meeting finder, and dashboard — without leaving Slack, that's where Team TimeZone sits. It's the only tool on this list that combines all three in a single Slack app. The trade-off is that it's paid, though the 14-day trial with no credit card lets you test everything before committing.
Try it free for 14 days
Auto time conversion, meeting finder, and team dashboards — all inside Slack. No credit card, no configuration, ready in 10 seconds.
Add to Slack — Free Trial