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Project Management · head to head

Clockwise vs Spark Mail

C

Clockwise

Project Management

Intelligent calendar management for teams

From
Free
Rated
-
Full reviewWebsite
Spark Mail logo

Spark Mail

Productivity

AI-assisted email client from Readdle with a Smart Inbox and team collaboration features

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Clockwise service discontinued and shut down on March 27, 2026; Spark Mail several sync features route mail metadata and, for some features, credentials through Readdle servers, which is a materially different trust model from a local-only IMAP client.
  • They diverge on capability: Clockwise covers Focus Time protection, Spark Mail covers Smart Inbox.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Clockwise and Spark Mail actually diverge.

Attributes where Clockwise and Spark Mail differ
AttributeClockwiseSpark Mail
Pricing modelfreemiumPer user per month
PlatformsWebmacOS, Windows, iOS, Android, Web
CategoryProject ManagementProductivity
Founded2016Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Clockwise

  • Focus Time protection
  • Meeting optimization
  • Scheduling links
  • Team analytics
  • Conflict resolution
  • Google Calendar
  • Slack
  • Zoom

Only in Spark Mail

  • Smart Inbox
  • AI Copilot
  • AI Summaries
  • Team collaboration
  • Send later and snooze
  • Multi-account unified inbox

What people use each for

The jobs each tool is most often brought in to do.

Clockwise

  • Schedulingnot Spark Mail
  • Appointment bookingnot Spark Mail
  • Time trackingnot Spark Mail
  • Resource managementnot Spark Mail
  • Team coordinationnot Spark Mail

Spark Mail

  • A freelancer juggling Gmail and Outlook accounts who wants one AI-assisted inboxnot Clockwise
  • A small support team sharing a single inbox with internal notes before replyingnot Clockwise
  • Someone who wants drafts and summaries generated without switching to a new mail hostnot Clockwise
  • A user who wants notification triage without writing their own filtersnot Clockwise

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Clockwise

  • Service discontinued and shut down on March 27, 2026
  • All user data was deleted upon shutdown
  • Integration with Asana was removed during product lifecycle

Spark Mail

  • Several sync features route mail metadata and, for some features, credentials through Readdle servers, which is a materially different trust model from a local-only IMAP client.
  • It is a client over accounts you still pay for elsewhere, so the total cost is Spark plus whatever Gmail, Outlook or Fastmail plan you already hold.
  • The free tier lacks AI Copilot and summaries, so the features it is best known for sit behind the paid plan.
  • Team features are basic next to dedicated shared-inbox tools like Front or Help Scout, so a support team scaling past a few agents will likely outgrow it.
  • Windows and Android versions have historically lagged the macOS and iOS apps in feature parity.

Pricing, plan by plan

Clockwise

Free
  • FreeFree
    • Focus Time
    • Meeting optimization
    • Personal analytics
  • Teams$6.75/month
    • Team analytics
    • Flexible meetings
    • Admin controls

Spark Mail

Free
  • BasicFree
    • Unlimited accounts
    • Smart Inbox
    • Basic send later
  • Premium$7.99/month
    • AI Copilot and summaries
    • Unlimited snooze and send later
    • Priority support
  • Premium Teams$10/month
    • Shared inboxes
    • Delegation and internal comments
    • Admin controls

Which should you pick?

Choose Clockwise if

  • You need focus time protection.
  • You want to start without paying.
  • You also want meeting optimization.
Clockwise review

Choose Spark Mail if

  • You need smart inbox.
  • You want to start without paying.
  • You work on macOS, Windows, iOS, Android, Web.
  • You also want ai copilot.
Spark Mail review

Questions people ask

Is Clockwise or Spark Mail better?
Neither clearly leads. Clockwise starts at Free and Spark Mail at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Clockwise or Spark Mail?
Clockwise starts at Free and Spark Mail at Free.
Does Clockwise or Spark Mail run on more platforms?
Clockwise runs on Web. Spark Mail runs on macOS, Windows, iOS, Android, Web.
Can I use Clockwise for free?
Both have a free tier, so you can try either at no cost before committing.
What is Clockwise best used for?
Clockwise is most often used for scheduling, appointment booking, time tracking, resource management. Of those, scheduling and appointment booking are not what Spark Mail is typically brought in for.
What can Clockwise do that Spark Mail cannot?
Clockwise covers Focus Time protection, Meeting optimization, Scheduling links, Team analytics. Spark Mail covers Smart Inbox, AI Copilot, AI Summaries, Team collaboration.

Answered from the vendors’ own pages

Clockwise: What happened to Clockwise?

Clockwise was acquired by Salesforce and shut down on March 27, 2026. The company announced the team was joining Salesforce to work on Agentforce. User data was deleted and prorated refunds were issued to paying customers.

Source
Spark Mail: Does Spark host my email?

No. It is a client that connects to Gmail, Outlook, iCloud or any IMAP account; you still need a mail host.

Clockwise: What integrations did Clockwise support?

Clockwise integrated with Google Calendar, Microsoft Outlook, Slack, and previously Asana (though this integration was discontinued).

Source
Spark Mail: Does Spark store my email credentials on its servers?

For some features, including cross-device snooze and send-later sync, yes. It is part of how those features stay consistent across devices.

Clockwise: What were Clockwise's key features?

Clockwise offered AI-powered focus time protection, automatic meeting buffers, Slack status sync, smart lunch breaks, and team calendar synchronization to optimize schedules and prevent burnout.

Source
Spark Mail: Is there a one-time purchase option?

No, Spark is subscription only for individuals and teams; the base client is free but AI and unlimited scheduling need Premium.

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