Synapse

Name: Synapse
Price: 4.99 EUR

Windows· paid plans from €4.99/mo

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Freedom report

One barScore 6.0

Free tierNo free tier
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Synapse is ranked #88 of 143 in email clients on Freedom251, made by Synapse (Turin, Italy). It runs on Windows. There is no free plan. Paid plans start at €4.99/mo.

Synapse plans and pricing

All plans

Synapse €4.99/mo One-time purchase; no subscription Lifetime access · All future updates included · No subscription synapsemail.app · 20 Sept 2026

Synapse €4.99 once One-time purchase · No subscription Lifetime access · All future updates included · No tiers synapsemail.app · 11 Oct 2026

Compared on email clients

Free plan: No
App coverage: desktop
Unified inbox: Yes
Offline access: Yes
Calendar tools: Yes

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The record

Product: Synapse is a Windows email client with on-device AI.
Email sync: It uses the Gmail REST API for Gmail and IMAP IDLE push for other providers.
Search: It combines BM25 full-text search and 768-dimensional multilingual semantic embeddings, with support for 100+ languages.
Local AI: Its optional Qwen3.5-4B model runs on a Vulkan GPU, or users can provide their own cloud API key.
Integrations: Listed plugins include Asana, ClickUp, Google Calendar, and Reminders; the site also describes adding integrations in Rust.
Email accounts: Synapse supports OAuth2 for Google and Microsoft via PKCE and says it does not store passwords.
Security: The site says credentials are encrypted with AES-256 and the key is sealed inside the device's hardware TPM.
Privacy: The site lists zero telemetry events, analytics scripts, cloud relays, and stored passwords.
Local data: Mail is cached in a local SQLite database, and the site says AI inference is offline after the model's one-time download.
Requirements: The stated requirements include Windows 11 x86_64, 16 GB RAM, and 1 GB storage, plus about 2.5 GB for the optional AI model.
Notable limit: Windows 11 x86_64 is listed as the only supported platform.
Support: The site lists [email protected] as its contact email.
Availability: The site says Synapse is in active development and invites visitors to join a launch-notification list.
Maker: The site identifies Valerio as the builder of Synapse.
Price from: €4.99/mo

Where it ranks on Freedom251

Best Email Clients in 2026#88 of 143

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Sources

synapsemail.app· checked 11 Oct 2026
synapsemail.app/pricing/· checked 20 Sept 2026