saasrankedSoftware, ranked on the facts

email client · Readdle

Spark Mail

Cross-platform email app with a free plan that has unlimited accounts and a calendar.

56/100

#9 of 10 email clients
Facts checked 8 Oct 2026

In short

Spark suits people who want one free app on every device, with unlimited accounts, a unified inbox and a calendar1,3. Plus adds templates and AI1. The catch: Spark states that some features need server-side processing of mail, and no OpenPGP, S/MIME or rules are listed3,7,8.

Best for: People with many accounts who use a phone, a Mac and a PC.

Where the points come from

Mail and accounts21 of 27
Calendar and contacts6 of 9
Privacy and encryption0 of 28
Systems and upkeep11 of 15
Price18 of 21

Mail and accounts 21 of 27 points

RuleWhat is publishedPoints
Account typesIMAP, Exchange, Gmail and Microsoft 365 sign-inWorks with IMAP and EWS accounts; Google sign-in and Microsoft Graph sign-in are documented. POP3 is not mentioned4,5,6.9 / 12
Unified inboxYesFeatures page lists a unified inbox for multiple email accounts3.4 / 4
Mail toolsScheduled send, Snooze, Undo send, TemplatesSend Later, Snooze and an undo-send timer are documented; Custom Templates are on the Plus plan1,3,10.8 / 8
Filters and rulesNot publishedNot published in the vendor's help article list; only smart folders and sender blocking appear10.0 / 3

Calendar and contacts 6 of 9 points

RuleWhat is publishedPoints
Built-in calendarYesThe Free plan lists a calendar, and help covers creating events1,10.6 / 6
CalDAV and CardDAVNot publishedNot published on the vendor's pages3,10.0 / 3

Privacy and encryption 0 of 28 points

RuleWhat is publishedPoints
OpenPGPNot publishedNot published on the vendor's pages3,10.0 / 7
S/MIMENot publishedNot published on the vendor's pages3,10.0 / 6
Blocks tracking pixelsNot publishedNot published on the vendor's pages3,10.0 / 4
Open-source appsNot publishedNot published on the vendor's home page or download page2,9.0 / 6
Mail stays on your deviceNoSpark says scheduled emails and notification data are stored on its servers, and some features need server-side processing7,8.0 / 5

Systems and upkeep 11 of 15 points

RuleWhat is publishedPoints
Other systemsmacOS, iOS, AndroidFeatures page has download links for Windows, Mac, Android and iPhone; download page links Mac and Windows apps3,9.6 / 10
Released in the last yearYesMicrosoft Store listing for Spark Desktop shows the app package last updated on 6 October 202611.5 / 5

Price 18 of 21 points

RuleWhat is publishedPoints
No ads in the appNot publishedPricing page does not mention ads, and does not say there are none1.0 / 3
Free planYesFree plan with unlimited email accounts and no time limit shown1.6 / 6
Cost of a year$0The Free plan has unlimited accounts, so it counts as $0. The cheapest paid plan, Plus, is €99 a year1.12 / 12

The rule behind each line: how we score email clients.

Plans and prices

As the vendor lists them, before tax. Prices are in US dollars unless the plan shows euros; the points use US dollars, with euros converted at the ECB rate.

PlanPrice as listedPer monthNotes
Free1 personFree1$0Unlimited accounts, smart inbox, calendar
Plus1 person€99/year (€10/month)1$9.23Adds custom templates, Spark +AI and integrations; monthly billing is €10
Pro1 person€229/year (€22/month)1$21.35Adds read statuses and advanced team features

The page shows €120 and €264 next to the yearly prices of €99 and €229, which are twelve times the monthly prices of €10 and €221.

Strengths

  • The Free plan has unlimited email accounts and a calendar1.
  • Snooze, Send Later, a unified inbox and an undo-send timer are documented3,10.
  • Apps for Windows, Mac, iPhone and Android3,9.
  • Connects Gmail, Outlook, Microsoft 365, iCloud, Yahoo, Exchange and other IMAP or EWS accounts4.

Limits

  • Send Later, Teams and notification features use Spark's servers7,8.
  • Custom Templates need the paid Plus plan1.
  • No OpenPGP, S/MIME, CalDAV or rules are listed3,10.

What Readdle says

Vendor claims. We show them, but they earn no points.

  • Spark says it never sells your data8.

Other email clients

  1. 1
    Mozilla ThunderbirdPeople who want a free, open-source client with built-in encryption
    88/100
    $0cost of a year
  2. 2
    BetterbirdThunderbird users who want more control over how mail is listed, sorted and searched
    78/100
    $0cost of a year
  3. 3
    BlueMailPeople who want a free app with PGP, a calendar and many accounts
    78/100
    $0cost of a year
  4. 4
    eM ClientPeople who want PGP, S/MIME and a calendar in one paid Windows app
    73/100
    $55.87/yrcost of a year

All 10 email clients

Sources

  1. Spark pricing, Readdle. Accessed 8 Oct 2026.
  2. Spark home page, Readdle. Accessed 8 Oct 2026.
  3. Spark features, Readdle. Accessed 8 Oct 2026.
  4. Add and manage accounts, Readdle. Accessed 8 Oct 2026.
  5. Connect to your email account in Spark, Readdle. Accessed 8 Oct 2026.
  6. Microsoft account sign-in required after Spark update, Readdle. Accessed 8 Oct 2026.
  7. Email storage and backups, Readdle. Accessed 8 Oct 2026.
  8. Spark email privacy: everything you need to know, Readdle. Accessed 8 Oct 2026.
  9. Download Spark, Readdle. Accessed 8 Oct 2026.
  10. Spark help center articles, Readdle. Accessed 8 Oct 2026.
  11. Spark Desktop, Microsoft Store. Accessed 8 Oct 2026.

Website: sparkmailapp.com · Markdown version · We are not affiliated with Readdle.