Inboxed vs. Spark
Spark is a polished email client. But it stores your emails on Readdle's servers to power its features. Inboxed gives you the polish without the privacy trade-off.
| Feature | Spark | Inboxed |
|---|---|---|
| AI Processing | ✕ Cloud-based (OpenAI) | ✓ Local LLM (Apple MLX) |
| Privacy | ✕ Emails stored on Readdle servers | ⊕ 100% On-Device |
| Cost | $59/year (Premium) | ⚡ Free (Pro: $1 lifetime) |
| AI Smart Reply | ✕ Cloud AI (GPT-4) | ✓ Local LLM on Metal GPU |
| Data Ownership | ✕ Readdle retains copies | ✓ Your Mac only |
Same polish. Zero cloud dependency.
Spark's AI features are impressive — but they require your emails to be stored on Readdle's servers and processed through OpenAI's API.
Inboxed delivers the same smart features using models that run entirely on your Mac. No server storage, no API calls, no data sharing.
Bottom Line
Spark from Readdle is one of the most polished email clients on macOS and iOS, with a well-designed AI writing assistant, Smart Inbox categorization, and team collaboration features at a reasonable $59.99/year. The honest limitation is architectural: Spark processes your email on its servers (hosted on Google Cloud) to enable Smart Inbox, cross-device sync, and AI features. Readdle does not sell your data and complies with GDPR, but the emails themselves pass through Readdle's infrastructure. Inboxed makes the opposite architectural choice — no server involvement for AI processing, everything on-device via Apple MLX. Choose Spark if you want iOS/macOS parity and team collaboration; choose Inboxed if you want zero server-side AI processing of your email content.
Frequently Asked Questions
Does Spark really store my emails on its servers?
Spark doesn't permanently store your email messages on its own servers — your email lives on your email provider's IMAP servers (Gmail, iCloud, Outlook, etc.) as always. What Spark does is cache and process email through its infrastructure, hosted on Google Cloud, to enable Smart Inbox categorization, push notifications, and AI features. This means Spark's servers read and analyze your email content in transit to produce categories and AI summaries. Readdle has explicitly stated that Spark does not back up your emails and uses Azure OpenAI (which does not train on customer data), but the processing architecture necessarily involves Readdle's cloud infrastructure seeing your messages.
How does Spark's pricing compare to Inboxed, and what do you get at each price point?
Spark's premium tier costs $59.99/year ($4.99/month) and includes AI writing features, Smart Inbox, cross-device sync across Mac and iPhone, and team collaboration tools including shared drafts, internal comments, and delegation. There's a free tier with monthly AI usage limits. Inboxed is free with a one-time $1 lifetime Pro upgrade. The feature comparison reflects those price points: Spark offers more polish, iOS support, and team features. Inboxed offers deeper local AI capabilities without any cloud processing. If you regularly switch between Mac and iPhone and want consistent AI across both devices, Spark's cross-platform approach is more complete than what Inboxed currently offers.
Who is Spark best for versus who should choose Inboxed?
Spark is the better choice for users who work across Mac and iPhone heavily and want AI features on both platforms, for small teams who need shared inbox collaboration without moving to a full enterprise tool, and for users who prioritize UI polish and a large feature set over privacy architecture. The $59.99/year price is competitive for what it delivers. Inboxed suits users whose primary concern is keeping email content off cloud servers for AI processing — lawyers, healthcare workers, journalists, researchers, or anyone handling sensitive correspondence. It's also the right choice for macOS-only users who don't need iOS email AI and want a lightweight, fast native app without a recurring subscription.