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Productivity · head to head

Spark Mail vs Structured

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
Structured logo

Structured

Productivity

Visual daily planner for time blocking

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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.; Structured no monthly view available, only daily and weekly views, limiting ability to preview long-term schedules
  • They diverge on capability: Spark Mail covers Smart Inbox, Structured covers Visual timeline.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where Spark Mail and Structured differ
AttributeSpark MailStructured
Pricing modelPer user per monthUnknown
PlatformsmacOS, Windows, iOS, Android, WebiOS, iPadOS, macOS, Android, Web, Apple Watch
FoundedUnknown2020

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

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 Spark Mail

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

Only in Structured

  • Visual timeline
  • Time blocking
  • Calendar integration
  • Widgets
  • Recurring tasks
  • Apple Calendar
  • Google Calendar
  • Apple Reminders

What people use each for

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

Spark Mail

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

Structured

  • Productivitynot Spark Mail
  • Collaborationnot Spark Mail
  • Task managementnot Spark Mail
  • Organizationnot Spark Mail

Where each one falls short

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

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.

Structured

  • No monthly view available, only daily and weekly views, limiting ability to preview long-term schedules
  • Cannot export to Excel, PDF, or other printable formats; only JSON export available on Apple devices
  • Calendar import requires Pro subscription (except on web where free import is available)
  • Android and web versions significantly lag behind iOS version in features and performance
  • One-way calendar sync only; cannot export Structured tasks back to Google Calendar or other external calendar apps

Pricing, plan by plan

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

Structured

Free
  • FreeFree
    • Timeline tasks and all-day tasks
    • Task subtasks and notes
    • Icons and color coding
  • Pro$undefined/month or year or lifetime
    • Structured AI for smart planning
    • Calendar and reminders import
    • Recurring tasks

Which should you pick?

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

Choose Structured if

  • You need visual timeline.
  • You want to start without paying.
  • You work on iOS, iPadOS, macOS, Android, Web, Apple Watch.
  • You also want time blocking.
Structured review

Questions people ask

Is Spark Mail or Structured better?
Neither clearly leads. Spark Mail starts at Free and Structured at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Spark Mail or Structured?
Spark Mail starts at Free and Structured at Free.
Does Spark Mail or Structured run on more platforms?
Spark Mail runs on macOS, Windows, iOS, Android, Web. Structured runs on iOS, iPadOS, macOS, Android, Web, Apple Watch.
Can I use Spark Mail for free?
Both have a free tier, so you can try either at no cost before committing.
What is Spark Mail best used for?
Spark Mail is most often used for a freelancer juggling gmail and outlook accounts who wants one ai-assisted inbox, a small support team sharing a single inbox with internal notes before replying, someone who wants drafts and summaries generated without switching to a new mail host, a user who wants notification triage without writing their own filters. Of those, a freelancer juggling gmail and outlook accounts who wants one ai-assisted inbox and a small support team sharing a single inbox with internal notes before replying are not what Structured is typically brought in for.
What can Spark Mail do that Structured cannot?
Spark Mail covers Smart Inbox, AI Copilot, AI Summaries, Team collaboration. Structured covers Visual timeline, Time blocking, Calendar integration, Widgets.

Answered from the vendors’ own pages

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.

Structured: Is Structured free to use?

Yes, Structured has a free tier that includes timeline tasks, all-day tasks, inbox tasks, subtasks, notes, icons, color coding, drag and drop, and calendar import on web (though calendar import requires Pro on iOS/Android). The app is free to download on iOS, Android, Mac, and web.

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.

Structured: What does Structured Pro cost and what features does it add?

Structured Pro is available as a monthly or yearly subscription, or as a one-time lifetime purchase for $99.99 USD. Pro adds Structured AI, calendar import and reminders import (on iOS/Android), recurring tasks, replan functionality, custom notifications, and custom color palettes.

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.

Structured: Can I import my Google Calendar into Structured?

Yes, Structured supports importing calendars from Google Calendar, Outlook, Microsoft Exchange, Yahoo, and AOL. On iOS, it connects through Apple Calendar compatibility. On Android and web, you authenticate with your Google account and select which calendars to sync. This feature requires a Structured Pro subscription.

Source
Structured: Can I export my tasks from Structured and in what formats?

On Apple devices, you can export your data as a JSON file through Settings > About > Privacy & Permissions > Export Your Data. However, you cannot export tasks to external calendars, nor can you export to printable formats like Excel or PDF. Export is one-way only.

Source
Structured: Does Structured work across all my devices?

Yes, Structured syncs across iPhone, iPad, Mac, Apple Watch, and Android devices. However, users have reported that iCloud synchronization can be unreliable, and the Android and web versions have fewer features and slower performance compared to the iOS version.

Source
Structured: What calendar and reminder apps does Structured integrate with?

On iOS, Structured can import from Apple Calendar, Reminders, Google Calendar, Outlook, Microsoft Exchange, Yahoo, and AOL. On Android and web, it supports Google Calendar. Structured can import events and reminders, but cannot export tasks back to external calendars.

Source
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