11 Best Spark Mail Alternatives (2026): Free, Private, AI

Short answer: the best Spark Mail alternative depends on why you want to leave. For privacy and on-device AI triage across Mac, iPhone, Windows and Android, try Canary Mail (our app). For a free app that is already on your Mac and iPhone, use Apple Mail. For more AI on a Gmail account, Shortwave or Superhuman. For Spark Teams-style shared inboxes, Missive. For Microsoft 365, Outlook. On Linux, where Spark doesn't run, Thunderbird or Mailspring.

Who should actually leave Spark? Mostly three groups: people who paid for the old Premium plan and don't want to pay $99 a year for Plus, people who don't want an email app keeping their login tokens or passwords on its servers, and people who need Linux or a web app. If Spark's free plan covers you and none of that bothers you, staying is a reasonable choice (see when to stay on Spark).

Disclosure: Canary Mail is our product, and it's #1 on this list, so weigh that pick accordingly. Prices and platforms for every app were checked on the vendor's own site or the US App Store in September 2026.

Spark alternatives compared

Why people leave Spark

Spark, made by Readdle, is still a good app with a generous free plan. Four things explain most searches for an alternative.

Pricing: Premium was replaced by Plus and Pro

Spark used to sell one paid tier, Spark Premium, at about $60 a year ($59.99, still listed as a legacy in-app purchase on the Mac App Store). New subscribers now choose between Plus at $99 a year ($10 month to month) and Pro at $199 a year ($20 month to month), per user. Plus adds Spark +AI, templates, integrations and unlimited collaborators. Pro adds shared inboxes, read statuses, unlimited AI meeting notes and the HubSpot integration. Spark says features and usage may differ for people on legacy plans.

Your credentials sit on Spark's servers

Spark's privacy pages say it stores OAuth tokens (for Gmail, Outlook and Yahoo) or your login credentials (for Exchange, AOL and custom IMAP accounts) on its servers. That is how your accounts appear on a new device after one sign-in, and how push notifications, Send Later and shared drafts work. For notifications, Spark keeps an encrypted subject and part of the message and deletes it after 4 hours. The servers run on Google Cloud. There is no mode that turns this off.

AI is off by default and metered

Spark +AI (writing help, summaries, translation and the AI Assistant) is off until you enable it, and the free plan only gets a limited preview with no monthly +AI credits. Paid plans have a monthly quota that doesn't roll over. Requests go to third-party models (Readdle names Azure OpenAI; its privacy policy also lists OpenAI, Anthropic's Claude and Google Vertex AI), and providers may keep inputs for up to 30 days. Readdle says it doesn't use your data to train AI models.

A heavier app, and no Linux or web version

Spark has grown from an email client into a suite with a calendar, AI meeting notes, an AI assistant, CRM integration and, in 2026, access for AI agents. If you only wanted a fast inbox, that can feel like too much. Spark runs on Mac, iPhone and iPad, Android and Windows, but there is no Linux app and no web version.

When to stay on Spark

Spark's free plan still includes unlimited email accounts, the Smart Inbox, a unified inbox, smart notifications, scheduled send, snooze and the calendar, plus 2 free collaborators for team threads. It runs on Windows and Android as well as Apple devices, which Apple Mail and Airmail don't. If you use it for free, you're comfortable with its server-side sync, and you don't need Linux, there's little reason to move. For a side-by-side with the built-in option, see Apple Mail vs Spark.

The 11 best Spark Mail alternatives

1. Canary Mail: Best for privacy with AI

Canary Mail is the closest like-for-like swap if Spark's server-side storage is what bothers you. It has a unified inbox for unlimited accounts on the free plan, and it runs on the same four platforms as Spark.

Be clear about how it handles your data. Triage and prioritisation run on your device. Drafting, summaries and natural-language answers use hosted AI models, and Canary says your mail is never used to train them. For notifications you choose between two modes. Push briefly holds your credentials or OAuth token, plus the sender, subject and first line of a new message, on Canary's server until the notification is delivered. Fetch checks for mail from the device, and keeps credentials on your device only, at the cost of slower alerts (about every 15 minutes).

• Replaces in Spark: Smart Inbox (on-device prioritisation), Send Later, read receipts, AI drafting and summaries
• Platforms: Mac, iPhone and iPad, Windows, Android
• Free plan: Unlimited accounts on up to 2 devices
• Paid: Growth $36/year (AI Copilot, read receipts, Send Later); Pro+ $100/year adds PGP and SecureSend encryption; lifetime licences also sold
• Watch out for: No shared team inbox, no Linux or web app. Fetch mode means delayed notifications. Full comparison: Canary Mail vs Spark

2. Apple Mail: Best free option on Mac and iPhone

Apple Mail is already on your Mac and iPhone, handles iCloud, Gmail, Outlook, Yahoo, Exchange and any IMAP account, and connects to your provider from your device. It covers most of what people use Spark for day to day: All Inboxes, Send Later, Undo Send, Remind Me, Mail Privacy Protection and automatic categories. On Apple Intelligence devices (M1 Mac or later) you also get summaries, Priority Messages and Smart Reply at no cost.

• Replaces in Spark: Unified inbox, Send Later, snooze (Remind Me), categories in place of Smart Inbox
• Platforms: Mac, iPhone and iPad only
• Price: Free
• Watch out for: No Windows or Android app, no shared threads or team features, limited customisation. See Apple Mail's AI features

3. Shortwave: Best AI-first choice for Gmail

Shortwave is built around an AI assistant: ask it to find an email, summarise a thread or draft a reply in your style, and let AI filters sort incoming mail into bundles. If Spark +AI's monthly limits frustrate you, Shortwave goes much further. The catch is that it works only with Gmail and Google Workspace accounts.

• Replaces in Spark: +AI, Smart Inbox (bundles and AI filters), snooze, Send Later
• Platforms: Mac, Windows, iPhone, Android, web
• Price: 14-day trial, then Business $30, Premier $45 or Max $120 per user a month
• Watch out for: Gmail only, no free plan, and the desktop app is not native

4. Superhuman: Best for speed and keyboard-driven work

Superhuman is for people who live in email and want to get through it fast: keyboard shortcuts for everything, Split Inbox, reminders, read statuses and AI writing and triage. It's the most expensive app here and works only with Gmail and Outlook (Microsoft 365) accounts, so iCloud and IMAP users can't switch to it. More options at a lower price: Superhuman alternatives.

• Replaces in Spark: Smart Inbox (Split Inbox), Send Later, reminders, read statuses, AI
• Platforms: Mac, Windows, iPhone, Android, web
• Price: Starter $30 a month or $300 a year; Business $40 a month or $396 a year
• Watch out for: Gmail and Outlook only, no free plan

5. Missive: Best replacement for Spark's team features

If you used Spark for shared threads and comments, Missive is the dedicated version: shared inboxes, assignments, internal chat next to each email, shared drafts and rules. For the basics of setting one up, see our shared inbox setup guide.

• Replaces in Spark: Shared threads, comments, shared drafts, Pro's shared inboxes
• Platforms: Mac, Windows, iPhone, Android, web
• Price: 30-day trial, then Starter $14, Productive $24 or Business $36 per user a month
• Watch out for: No free plan; more than a solo user needs

6. Microsoft Outlook: Best for Microsoft 365 users

Outlook is free on every platform Spark supports, plus the web. Focused Inbox is the nearest thing to Spark's Smart Inbox, and mail and calendar live in one app. Nothing handles Exchange and Microsoft 365 accounts better.

• Replaces in Spark: Smart Inbox (Focused Inbox), calendar, snooze, scheduled send
• Platforms: Mac, Windows, iPhone, Android, web
• Price: Free; free Outlook.com accounts show ads, and a Microsoft 365 plan removes them
• Watch out for: Outlook can sync non-Microsoft accounts through the Microsoft Cloud, so it doesn't solve the server-side concern for Gmail or iCloud users. See Outlook alternatives

7. Spike: Best for chat-style email

Spike shows email as conversations, like a messaging app, and adds team chat, video meetings and collaborative notes. It suits teams that want something closer to Slack.

• Replaces in Spark: Shared threads and team chat, AI, unified inbox
• Platforms: Mac, Windows, iPhone, Android, web
• Price: Free for 1 email account and 10 AI queries; Pro $6 per user a month (billed yearly, up to 3 addresses); Ultimate $12 for unlimited addresses
• Watch out for: The free plan covers only one account, and the chat layout isn't for everyone. See Spike alternatives

8. Airmail: Best for customisation on Apple devices

Airmail is an Apple-only client with deep customisation: custom actions and swipes, per-account settings and links to dozens of apps. It has no Spark-style team layer. Airmail now sells an optional Ai Composer as a separate in-app purchase. See the Airmail vs Spark comparison below.

• Replaces in Spark: Unified inbox, snooze, Send Later, AI writing (with Ai Composer)
• Platforms: Mac, iPhone and iPad, Apple Watch, Vision Pro
• Price: Airmail Pro is $7.99 a month or $49.99 a year on the Mac App Store, and $39.99 a year on iPhone; Ai Composer is extra
• Watch out for: No Windows or Android; subscriptions differ between Mac and iPhone. See Airmail alternatives

9. Mimestream: Best for Gmail on a Mac

Mimestream is a native Mac app that talks to Gmail through Google's own API, so labels, filters, categories, aliases and profiles behave exactly as they do in Gmail.

• Replaces in Spark: Unified inbox for several Gmail accounts, snooze, scheduled send
• Platforms: Mac only
• Price: 14-day trial, then $4.99 a month or $49.99 a year
• Watch out for: Gmail and Google Workspace only; no iPhone, Windows or Android app

10. Thunderbird: Best free and open-source option

Thunderbird is free, open source and connects straight to your mail servers with no vendor account in the middle. It has OpenPGP encryption, a calendar and add-ons built in, and it's the most complete desktop client on Linux. An Android app is out; the iPhone app is in public TestFlight beta, and the team hopes to ship it by the end of 2026.

• Replaces in Spark: Unified inbox, calendar, and the Linux and Windows desktop
• Platforms: Windows, Mac, Linux, Android; iOS in beta
• Price: Free (funded by donations)
• Watch out for: Older-feeling interface, no AI or smart sorting out of the box

11. Mailspring: Best Spark-like look on Linux

Mailspring is a free desktop client for Mac, Windows and Linux with a clean interface that many Linux users find closest to Spark. You get a unified inbox for unlimited accounts, fast search and templates. Pro adds read receipts, link tracking, Send Later and follow-up reminders.

• Replaces in Spark: Unified inbox, Send Later and reminders (Pro), a Spark-style layout on Linux
• Platforms: Mac, Windows, Linux
• Price: Free; Pro $8 a month
• Watch out for: No mobile app, so you'll need a different app on your phone

Also worth a look

• BlueMail: free with unlimited accounts on iPhone, Android, Mac, Windows and Linux, one of the few apps that runs everywhere Spark does plus Linux.
• Edison Mail: free on iPhone, Android, Mac and Windows. It stays free partly by using anonymised data from commercial emails such as receipts for its Edison Trends research; you can opt out in its privacy settings, per Edison's privacy policy.
• Mailbird: Windows and Mac only, no mobile app. The free plan covers one account; Premium is $34.49 a year or $159 once on the Mac App Store.
• Proton Mail and HEY: these are email services, not just apps. Choose them if you want to change your email address and provider, not only the app you read mail in.

Airmail vs Spark: which is better?

For most people, Spark is the better default: it has a real free plan, the Smart Inbox, team features, and apps for Windows and Android. Airmail is better for Apple-only power users who want to customise every action and would rather not have their accounts managed through an email company's cloud.

Pick Airmail if you're all-in on Apple and like to tune your tools. Stay with Spark if you need Windows or Android, or if your team shares threads.

Is there Spark Mail for Linux?

No. Spark has apps for Mac, iPhone and iPad, Android and Windows, but none for Linux, and there is no web version you could open in a Linux browser. The best Linux options are:

• Thunderbird: the most complete free client, with OpenPGP, a calendar and an Android companion app.
• Mailspring: the closest to Spark's clean look; free, with an $8 a month Pro plan.
• BlueMail: free, and has apps on phones too, so you get one app on Linux and mobile.

Spark features and their equivalents

How to switch from Spark

Your email lives with your provider (Gmail, iCloud, Outlook and so on), not in Spark, so nothing is lost when you switch apps. Here's the order that works:

1. Add your accounts to the new app and wait for mail to sync. For help choosing, see the best email apps for multiple accounts.
2. Recreate what doesn't move: signatures, templates, Smart Inbox settings and team comments stay in Spark. Messages scheduled with Send Later are held on Spark's servers, so send or cancel them first.
3. Remove your data from Spark. On Mac, open Spark Settings and click Remove your data. On iPhone, go to Settings, tap your account and choose Remove My Data From Spark. On Android, go to Settings, then Spark Account, then Remove my data from Spark. Type Remove to confirm.
4. Cancel any subscription. Subscriptions bought through Spark's website end automatically when you remove your data; App Store and Google Play subscriptions must be cancelled in those stores.
5. Revoke Spark's access. For Google accounts, remove Spark under your Google Account's third-party connections; for Microsoft accounts, under apps with access. If you signed in with a password (Exchange or IMAP), consider changing it.
6. Set your new default mail app. On Mac, open Apple Mail and choose Settings, General, Default email reader. On iPhone, go to Settings, Apps, your new app, Default Mail App.

How we chose

We kept the apps people leaving Spark compare most that fix a specific Spark complaint: price, server-side storage, AI, team features or Linux. Prices and platforms were checked on vendor sites or the US App Store in September 2026; confirm before you buy. For Mac-only readers, our ranking of the best email clients for Mac goes deeper on each app.

Spark Mail alternatives: FAQ

What is the best alternative to Spark Mail?

It depends on why you're leaving. Canary Mail for privacy controls and AI on Mac, iPhone, Windows and Android; Apple Mail if you want free and only use Apple devices; Shortwave or Superhuman for AI on Gmail; Missive for team inboxes; Outlook for Microsoft 365; Thunderbird or Mailspring on Linux.

Is Spark Mail still free?

Yes. The free plan includes unlimited email accounts, the Smart Inbox, a unified inbox, scheduled send, snooze and the calendar. Spark +AI and advanced team features need Plus ($99 a year) or Pro ($199 a year).

Does Spark store my passwords on its servers?

Spark stores OAuth tokens for Gmail, Outlook and Yahoo, and login credentials for Exchange, AOL and custom IMAP accounts, on its servers so it can sync accounts across devices and send notifications. There is no setting to turn this off. You can remove your data from Spark's settings when you leave.

Is there a Spark Mail app for Linux or the web?

No. Spark runs on Mac, iPhone and iPad, Android and Windows only. On Linux, use Thunderbird, Mailspring or BlueMail.

Airmail vs Spark: which is better?

Spark, for most people: it is free, cross-platform and has team features. Airmail suits Apple-only users who want deep customisation.

Edison Mail vs Spark: which is better?

Both are free for everyday use. Spark adds team features and paid AI and keeps account credentials on its servers. Edison stays free partly by using anonymised data from commercial emails for research, which you can opt out of. Neither is the strongest privacy pick.

What is the best free Spark alternative?

Apple Mail on Mac and iPhone, Thunderbird on Windows, Mac, Linux and Android, and Outlook everywhere. Canary Mail, BlueMail and Mailspring also have free plans with unlimited accounts.

Which Spark alternative is best for teams?

Missive, for shared inboxes, assignments and internal chat on every platform. Spike suits teams that prefer chat-style email with built-in messaging.

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Sources

Checked September 2026.

• Spark plans and prices: sparkmailapp.com/pricing; legacy Spark Premium: Mac App Store in-app purchases
• Spark data storage: support.readdle.com/spark/privacy/privacy-explained and sparkmailapp.com/privacy
• Spark +AI providers and quotas: support.readdle.com/spark/tips-tricks/spark-ai
• Removing data from Spark: sparkmailapp.com/help/privacy-data/remove-data-from-spark-request-data-copy-or-deletion
• Canary Mail pricing and AI: canarymail.io/pricing, canarymail.io/features/ai; Push and Fetch: canarymail.io/help/why-does-canary-mail-offer-push-notifications
• Shortwave pricing: shortwave.com/pricing; Superhuman pricing: help.superhuman.com
• Missive pricing: missiveapp.com/pricing; Spike pricing: spikenow.com/pricing
• Airmail and Mailbird prices: US App Store in-app purchase lists
• Mimestream pricing: mimestream.com/pricing; Mailspring Pro: getmailspring.com/pro
• Thunderbird for iOS status: blog.thunderbird.net (July 2026)
• Edison Trends and opt-out: edisonmail.com/privacy; BlueMail: bluemail.me/pricing