Fluxmail vs Spark
Everything Spark does well (a smart inbox, snooze, send later, AI writing), plus an AI agent that acts on your inbox, a priority triage queue, and automation rules, on one plan with no AI quotas.
No credit card required. Cancel anytime.
All AI, no quotas
Every AI feature on one plan. Spark meters its AI by plan and caps usage.
AI that acts
Flux AI archives, labels, and drafts for you. Spark AI writes and summarizes.
Private by design
Email bodies are fetched only when needed and cached locally, never routed through our servers.
Pricing & plans
FluxmailSpark
Price
$15/month, or $12.50/month billed annually
Free tier; Plus is $10/month ($8.25/month annually), Pro is $20/month ($16.58/month annually)
Every feature on every plan
One plan, everything included
AI tools and team features are split across the Plus and Pro plans
AI without monthly quotas
No paying more for more AI
AI assistant requests and AI meeting notes are capped per plan
Free trial
7 days, no credit card required
7 days on paid plans
Connected email accounts
Up to 5 included, in one unified inbox
Unlimited accounts in one Smart Inbox
AI features
FluxmailSpark
AI assistant built into your inbox
Flux AI searches, summarizes, and drafts on every plan
AI Assistant writes and summarizes, with per-plan quotas
AI that takes actions on your email
Archive, label, draft, and more, straight from chat
Drafts and summarizes; auto-labels and workflows are announced for Pro, not shipped
Automatic AI inbox triage
AI inbox splits + automatic prioritization, out of the box
Smart Inbox groups and pins mail, but no AI priority queue
Rules that automate your inbox
Match on sender, subject, or an AI prompt, then auto-label, archive, draft, or prioritize
No rules engine; Pro workflows are announced, not shipped
Write with AI in your voice
Learns your style with encrypted AI memory
My Writing Style learns from your sent mail
Thread summaries
Automatic follow-up reminders
Detects threads still waiting on a reply
Inbox & speed
FluxmailSpark
Priority triage queue
Swipe through your highest-priority email one at a time
Split inbox
AI categorizes automatically
Smart Inbox groups by type, not by AI priority
Turn emails into tasks
Capture any email as a to-do linked back to the thread
Dedicated newsletter reading
Newsletters move to a shelf, grouped by publication
Newsletters grouped in the Smart Inbox
Mute threads & senders
Muted mail is auto-archived and never notifies you
Gatekeeper pre-screens and blocks senders
Unified inbox across accounts
Smart Inbox unifies accounts
Email bundles
Related threads grouped, actioned with one click
Smart Inbox grouping, without one-click bundle actions
Keyboard-first design
Gmail-style shortcuts
Shortcuts and a command bar
Snippets
Email templates
Snooze & reminders
Snooze and Send Later
Instant, fast UI
Sub-100ms interactions with an offline-first local cache
Fast, powerful search
Smart Search
Privacy & security
FluxmailSpark
Email bodies are not stored server-side
Bodies are not stored by Fluxmail; they are cached locally
Bodies stay with your provider, but the subject and a snippet sync to Spark servers for push (deleted within ~4 hours)
Blocks email trackers for you
Automatic, on by default
Optional remote-content blocking
AI providers with zero data retention
Your email is never retained or trained on
Azure OpenAI: not used for training, but retained up to 30 days
Security & compliance
CASA Tier 2 certified
GDPR compliant (Readdle)
Platforms
FluxmailSpark
Email providers
Gmail & Google Workspace
Gmail, Outlook, iCloud, Exchange, Yahoo & IMAP
Apps
Web, installable as a PWA on every device
Mac, Windows, iOS, iPad & Android apps, plus a built-in calendar
Spark details are based on publicly available pricing and documentation as of June 2026. See sparkmailapp.com/pricing for their latest plans.
Which one is right for you?
Best for most people
Choose Fluxmail if…
- You live in Gmail or Google Workspace and want the most capable AI email client there
- You want every AI feature on one plan, with no monthly quotas or meeting-note caps
- You want an AI agent that acts on your inbox (archiving, labeling, drafting, prioritizing), not one that only writes and summarizes
- You want a priority triage queue, automation rules, tasks from any email, and a dedicated newsletter shelf
- You care about privacy: bodies fetched on demand and cached locally, with nothing routed through our servers for notifications
- You want trackers blocked by default
Choose Spark if…
- You use Outlook, iCloud, Yahoo, Exchange, or IMAP, not just Gmail
- Your team works email together with shared drafts, comments, and delegation
Frequently asked questions
Never miss an important email again
Try Fluxmail for free. No credit card required.