Spark Mail and Spike are both freemium AI-assisted email clients with native cross-platform apps, but they take different approaches to the inbox itself.…
Best for Spark Mail: Individuals wanting unlimited connected email accounts even on the free plan, an AI assistant for summarizing/drafting within a traditional inbox layout, and one continuous pricing progression from Free through Enterprise.
Best for Spike: People who want a messenger-style conversational email experience, built-in video calls without a separate app, and a distinct low-cost per-member Teamspace track for team collaboration alongside individual email plans.
At a Glance
Spark Mail
Spike
Primary category
Communication
Communication
Rating
Not documented
Not documented
Pricing model
freemium
freemium
Starting price
Free (Plus from EUR10/month per user)
Free (Pro from $8/user/month)
Free plan
Yes
Yes
Free trial
Not documented
Not documented
Platforms
Web, iOS, Android, Mac, Windows
Web, iOS, Android, Mac, Windows
Team collaboration
Not documented
Not documented
AI features
Yes
Yes
Public API
Not documented
Not documented
Key Differences
Inbox interaction style
Spark Mail: Keeps a traditional inbox format enhanced by a Smart Inbox that automatically surfaces priority messages first.
Spike: Displays email threads as messenger-style conversations (Conversational email) while keeping standard email formatting for external recipients.
The two products present the same underlying email data in fundamentally different visual/interaction models.
Built-in video calling
Spark Mail: No video calling feature is documented.
Spike: Includes built-in video calls, from 1:1 up to 10-person depending on plan.
Spike bundles a meeting tool directly into the email app; Spark Mail users would need a separate video tool.
Free-tier email account limits
Spark Mail: Free plan supports unlimited email accounts alongside the Smart Inbox and calendar.
Spike: Free (Email) plan limits users to a single connected email address (up to 3 on Pro, unlimited on Ultimate).
Users managing multiple email addresses get more value from Spark Mail's free tier than Spike's.
Team pricing structure
Spark Mail: Team collaboration is a feature unlocked within its individual Plus/Pro/Enterprise plan tiers, not a separate product line.
Spike: Runs a distinct Teamspace pricing track (Starter/Team/Business, $0-$8/member/month) separate from its individual email plans.
Spike offers a dedicated low-cost per-member path for teams; Spark Mail's team features are bundled into its general plan tiers.
Feature-by-Feature
Inbox Experience
Feature
Spark Mail
Spike
Conversational/messenger-style inbox
Not documented
Available
Smart/priority inbox sorting
Available
Available
Sender screening/blocking
Available
Not documented
Built-in video calls
Not documented
Available
Built-in docs/channels
Not documented
Available
AI Features
Feature
Spark Mail
Spike
AI email summaries
Available
Available
AI writing assistant
Available
Not documented
Translation
Available
Not documented
Pricing & Plans
Feature
Spark Mail
Spike
Free plan email accounts
Available
Limited
Entry paid tier price
Available
Available
Dedicated per-member team pricing track
Not documented
Available
Company
Feature
Spark Mail
Spike
Founded year disclosed
Available
Not documented
Headquarters disclosed
Not documented
Not documented
Supported interface languages
Available
Not documented
Pricing Compared
Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.
Spark Mail
Free — EUR0 N/A
Plus — EUR10/month per user (EUR120/year, about EUR8.25/month billed annually) Monthly or annual
Pro — EUR22/month per user (EUR264/year, about EUR19.08/month billed annually) Monthly or annual
Enterprise — Custom (contact sales) Annual
Spike
Free — $0 N/A
Pro — $8/user/month ($60/year billed annually) Monthly or annual
Business — $16/user/month ($120/year billed annually) Monthly or annual
Pros & Cons
Spark Mail
Pros
Unifies multiple email accounts in one Smart Inbox
Useful built-in AI writing and meeting-notes tools
Strong team collaboration features for shared inboxes
Available across all major desktop and mobile platforms
Full AI features require the paid Plus or Pro plan
AI usage is credit-limited even on paid tiers
Some advanced workflow features are not yet fully available
Per-user pricing can add up for larger teams
Spike
Pros
Conversational inbox format can feel faster and more intuitive than traditional email
Combines email, chat, docs, and video calls in one app
Generous free plan for individual users
Reasonably priced Pro and Business tiers compared to bundling separate tools
Supports multiple email providers in one unified interface
Cons
Free plan limited to a single email account
Team-oriented features add most value at the paid tiers
Smaller company size than major email and productivity competitors
Conversational format may require an adjustment period for users used to traditional threaded email
Use Cases
Choose Spark Mail: Individuals wanting unlimited connected email accounts even on the free plan, an AI assistant for summarizing/drafting within a traditional inbox layout, and one continuous pricing progression from Free through Enterprise.
Choose Spike: People who want a messenger-style conversational email experience, built-in video calls without a separate app, and a distinct low-cost per-member Teamspace track for team collaboration alongside individual email plans.
Need both: A small team evaluating email clients might trial both at no cost, since Spike's free Teamspace (up to 3 members) and Spark Mail's free unlimited-account plan both cost nothing, before settling on either the conversational or traditional inbox style.
Spark Mail
Personal email triage with AI assistance — Uses the Smart Inbox and AI writing tools to clear email faster for individual users.
Shared team inboxes for support or sales — Lets teams collaborate on shared inboxes with delegation and internal comments.
Meeting follow-ups via AI notes — Combines email and AI-generated meeting notes so follow-ups happen in one app.
Spike
Faster personal email management — Individuals use Spike's conversational inbox and AI triage tools to get through email more quickly than with a traditional client.
Unified team communication — Small teams use Spike to combine email, chat, docs, and video calls in a single app instead of juggling separate tools.
Custom team email domains — Organizations use Spike Teamspace to set up shared or custom-domain team email alongside collaborative workspace features.
Frequently Asked Questions
Does Spark Mail have a free plan?
Yes, the Free plan includes the Smart Inbox, unlimited email accounts, smart notifications, and calendar at no cost.
What does Spark's AI assistant do?
It can find, summarize, and take action on messages in the inbox, and help draft replies.
How much does Spark Mail's Plus plan cost?
€10/month billed monthly, or €8.25/month (€99/year) billed annually.
Is Spike free to use?
Yes, Spike offers a Free plan for a single email address as well as a free Starter teamspace for up to 3 members.
Does Spike work with Gmail and Outlook?
Yes, Spike connects to existing Gmail, Outlook, and other email accounts.
What does Spike's AI do?
It provides smart inbox sorting, AI summaries of unread email, and contextual draft replies.