Side by side
Becky! Internet Mail vs Synapse
Both stand on email clients. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free trial Windows
Becky! Internet Mail provides a broad set of account, message, filtering, and scheduling tools for Windows. The trial allows evaluation, but continued use requires a license and international purchasing is restricted on the English page.
Visit Becky! Internet Mail Paid Windows
Synapse combines a unified Windows inbox with calendar tools, multilingual semantic search and optional local AI. Its one-time €4.99 purchase includes lifetime access and future updates, while platform support remains limited to Windows 11 x86_64.
Visit SynapseThe facts
| Becky! Internet Mail | Synapse | |
|---|---|---|
| Free plan | A free trial | No |
| Open source | Not published | Not published |
| Runs on | Windows | Windows |
| Lowest paid plan | Becky! Internet Mail license: ¥4,400, paid once | Synapse: €4.99, paid once |
| Plans published | 3 | 1 |
| Maker | Becky! Internet Mail | Synapse |
| Website | rimarts.jp | synapsemail.app |
| On email clients | #135 of 142 | #131 of 142 |
Becky! Internet Mail: what it does well
- Supports POP3, IMAP4, and SMTP
- Multiple mailboxes and profiles
- Includes scheduled sending and reminders
- USB-carryable mailbox setup
- 30-day free trial
What to know first
- Runs on Windows 10 or later
- No free plan is listed
- S/MIME requires a digital certificate
- International English-page sales are closed
Synapse: what it does well
- Unified inbox, offline access and calendar tools
- Search supports more than 100 languages
- Optional local Qwen3.5-4B AI model
- AES-256 credential encryption with hardware TPM key
- Listed plugins include Asana and Google Calendar
What to know first
- Windows 11 x86_64 is the only listed platform
- No free plan
- Requires 16 GB RAM and storage
- Optional AI model needs about 2.5 GB
Alternatives to Becky! Internet Mail Alternatives to Synapse The whole list