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The best Spark Mail alternative
Spark Mail vs Clarity Inbox · 2026
Spark replaces your email app. Clarity leaves your email app alone.
The Bottom Line
Spark is a full email client from Readdle. You install it on your Mac, phone, Android device or PC, connect your accounts, and use it instead of Gmail or Outlook. In exchange you get a unified inbox across accounts, a Smart Inbox that groups newsletters and notifications away from people, shared drafts and comments for teams, and AI writing features including a style setting that learns from your recent sent mail. The mobile apps are genuinely good, and there is a free tier.
The cost is the switch. Everything you have built in Gmail — filters, labels, keyboard habits, the extensions bolted onto it, the way your team refers to a thread — now lives in a different app, and the AI only helps you inside that app. If you stop using Spark, you stop getting any of it.
Clarity never asks for that. It connects to the Gmail or Outlook account you already use and works in the background: incoming mail gets labelled by what it wants from you using Gmail labels or Outlook categories, replies appear in your normal drafts folder written in your voice, sent mail that gets no answer comes back in a morning brief. You open the same mail app you opened yesterday and the work has already been done.
Pick on the switch, then. Spark if the Gmail interface is the thing you resent; Clarity if you like your mail app fine and resent the pile inside it.
“AI email client from Readdle for Mac, iOS, Android and Windows”
Platform Overview
Clarity InboxBest for: People who will not leave Gmail or Outlook and want the work done inside it
Best for: People happy to switch email clients for a better interface, unified inbox and mobile apps
Spark Mail vs Clarity Inbox: At a Glance
| Clarity Inbox | ||
|---|---|---|
| Type of product | AI layer on the mailbox you already use | Email client you install and switch to |
| Do you change email apps? | No — stay in Gmail or Outlook | Yes — Spark becomes your mail app |
| Mobile apps | No app — works in your existing mobile mail app | Yes — iOS and Android |
| Where AI drafts appear | Your normal Gmail/Outlook drafts folder | Inside Spark |
| Follow-up tracking on sent mail | Yes — automatic, surfaced in the brief | Follow-up reminders you set |
| Morning brief | Yes — prioritised, with reasoning | No — Smart Inbox grouping instead |
| Team features | No | Yes — shared drafts, comments, delegation |
Core Features
A feature-by-feature breakdown of what each product actually does.
Are you willing to change email apps?
Clarity InboxClarity is not an email app.
You keep Gmail or Outlook exactly as it is — same interface, same filters, same shortcuts, same app on your phone. Clarity works on the account behind it, so the labels and drafts it creates show up wherever you already read mail.
- No new app to install or learn
- Labels are real Gmail labels, categories are real Outlook categories
- Drafts appear in your normal drafts folder, including on mobile
Spark is a very good one.
If you actively dislike the Gmail or Outlook interface, Spark is a real upgrade: unified inbox across accounts, a Smart Inbox that separates people from notifications, and polished apps on Mac, iOS, Android and Windows. Clarity offers none of that, because Clarity has no interface to your mail at all.
- Unified inbox across multiple accounts
- Native apps on Mac, iOS, Android and Windows
- Smart Inbox grouping of newsletters and notifications
Can other people work on the same email?
Clarity InboxNo — Clarity is single-user.
Clarity works on one person's mailbox. There are no shared drafts, no comment threads on an email, no delegation and no shared inbox. If your team writes replies together, Clarity does not support that.
- One mailbox, one user
- No shared drafts or comments
- No delegation or shared inbox
Yes — that is one of Spark's strengths.
Spark's team features let colleagues comment privately on a thread, write a draft together before it goes out, and delegate messages. For a small team that handles mail collectively, this is a real reason to choose it.
- Private comments on a thread
- Shared drafts written together
- Delegation between teammates
What happens after you press send?
Clarity InboxClarity keeps watching, without being asked.
Every sent thread is watched for a reply. When one goes silent, it comes back in the morning brief with how long it has been waiting — you do not have to predict at send time which emails will need chasing.
- Automatic on all sent mail
- No reminder to set at send time
- Silence surfaced in the morning brief
You set a reminder, or you forget.
Spark has follow-up reminders and snooze, which work well when you remember to use them. The emails that go missing are the ones you did not think to flag, and that is exactly the case a manual reminder cannot cover.
- Reminders and snooze, set by you
- Only covers threads you flagged
- No prioritised brief of outstanding replies
Clarity Inbox
Try Clarity Inbox for free
Connects to your existing Gmail in 2 minutes. No migration, no rules to set up.
Get started for freeNo credit card required
Pricing & Plans
Clarity InboxFree plan available
paid from $25/month
- AI reply drafts in your voice
- Automatic email labeling
- Follow-up tracking
- Morning inbox summary
Free tier · Premium priced per user, listed at roughly $8/month individual with an annual discount — check Readdle's current pricing
See Spark Mail's website for full details
- You dislike the Gmail or Outlook interface and want to replace it
- You juggle several accounts and want one unified inbox
- Your team comments on and co-writes email
- You want polished apps on Mac, iOS, Android and Windows
See Spark Mail's website for current pricing.
So, which one should you choose?
Choose Clarity Inbox if…- You are not willing to leave Gmail or Outlook
- You want the AI to work even when you read mail on your phone's normal mail app
- You want unanswered sent mail chased without flagging it first
- You want a morning brief rather than a rearranged inbox
- You work on your own mailbox, not a team's
- You dislike the Gmail or Outlook interface and want to replace it
- You juggle several accounts and want one unified inbox
- Your team comments on and co-writes email
- You want polished apps on Mac, iOS, Android and Windows
- You want AI writing help at a lower monthly price
Frequently Asked Questions
Do I have to stop using Gmail to use Clarity Inbox?
No. Clarity connects to your existing Gmail or Outlook account and works in the background. Spark is the opposite arrangement — it becomes the app you read mail in.
Does Clarity have a mobile app?
No, and it does not need one. Because Clarity writes real Gmail labels, Outlook categories and normal drafts, everything it does is already visible in whatever mail app you use on your phone.
Spark also learns my writing style. What is different about Clarity's drafts?
Both learn from your sent mail. The difference is placement and default: Spark's AI helps while you are composing inside Spark, whereas Clarity drafts replies before you open the thread and leaves them in your drafts folder. Clarity never sends without you.
Which is cheaper?
Spark, clearly. It has a free tier and Premium is listed at roughly $8/month for an individual. Clarity has a free plan and paid plans from $25/month. If price is the deciding factor, Spark wins it.
Can Clarity handle a shared team inbox like Spark?
No. Clarity is single-user. Shared drafts, comments and delegation are Spark features and Clarity has no equivalent.
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What it costs you
Roughly 9.1 hours a week
Estimate2.8 hrs of that we could cover
The rest stays yours — it is not repeatable.
106 hrs
a year, if the low end of the range holds
137
threads went quiet and nothing told you
Last 90 days · your own mail · illustrative figures
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