Start for free
Slashy vs Serif

Serif helps inside your inbox. Slashy is the inbox.

Serif learns your voice inside Gmail or Outlook. Slashy is the inbox itself, and it already knows what you’re replying to: the meeting you just had, the record in Attio, HubSpot, or Salesforce, the thread from last month. Open the thread and the reply is waiting, or send it by text from your phone.

Start for freeBook a demo

7 day trial · credit card required · cancel any timeBacked by Y Combinator

Slashy vs Serif

Comparison based on publicly available product information (serif.ai/assistant and serif.ai/pricing) reviewed October 9, 2026. Features and pricing may change.

Serif
AI drafts in your voice
Automatic triage and labels
Meeting prep briefs
Follow-up drafts after meetings
Follow-ups tracked when a thread goes quiet
Calendar and scheduling
Gmail and Outlook
A full email clientSerif works inside the inbox you already use, with Mac and iOS companion apps. Slashy replaces the client: inbox, labels, search, and calendar in one app.Inside your inbox
Keyboard-first inbox
Drafts grounded in your CRMSerif says it keeps a unified view across email, calendar, docs, CRM, and notes, without naming CRM vendors. Slashy connects to Attio, HubSpot, and Salesforce by name.Partial
Run the inbox from iMessage and Slack
VIP alerts
Open tracking
One planSerif’s assistant is $30 (Lite), $50 (Standard), or $200 (Pro) a month. Slashy is one plan with every feature.Three tiers

What changes when the inbox is the product

The reply is waiting when you open the thread

Slashy drafts in your voice from the meeting you just had, the Attio, HubSpot, or Salesforce record, and your past threads with this person, inside the thread you are reading.

Gavin Belson gavin@hooli.com
Acquisition Offer for Pied Piper
Your middle out algorithm is impressive. Hooli is prepared to offer $10 million for Pied Piper. This is a rare opportunity, Richard.Gavin BelsonCEO | Hooli
InterestedNeed more detailsNot interested

Before we proceed, I’d need to understand how this affects our IP and the team.

Send

Nobody waits on you without you knowing

Both products chase quiet threads. In Slashy the replies waiting on you are flagged by urgency in the inbox itself, with the draft ready when you open them.

Replies you owe
Sarah ChenQ4 budget reviewUrgent3d
Mike TorresIntro to the Redpoint teamDue today1d
Acme LegalSigned contract attachedWaiting on them2d

Run it from your phone

Slashy pings you when someone who matters writes, and you can text back to draft, send, or schedule without opening the inbox.

I see you’re still in the 10:00 meeting with Mike, want me to let Jane know you’re gonna be late? yea sg, emailed her btw, she also went to GT, could be good to bring up :)

Handle your inbox from iMessage

  1. 01.Tell Slashy what you need

    Ask for a reply, a summary, or a follow up in plain language.

  2. 02.Slashy handles it in your inbox

    It finds the right thread, uses the full context, and sends the finished draft back in iMessage.

  3. 03.Review and approve

    Get the result by text, request changes, or send it without opening email.

Find Monica’s last email, draft a reply confirming Thursday at 10:00 AM, and attach the Pied Piper deck.
Found Monica’s thread. I’m using the full conversation to draft the reply.
Done. I used your last Raviga thread for context and attached the Pied Piper deck.
From:richard@piedpiper.comTo:monica@raviga.comCc:laurie@raviga.comHi Monica, Thursday at 10:00 AM works. I attached the Pied Piper deck.SendSend later
Want me to send it, or change anything first?
Send it
Sent.

Built for people who live in email

Shortcuts, scheduling, integrations, tracking, and team tools are built into the same intelligent inbox.

Bring your inbox into the AI tools you use
Slashy MCPBring your inbox into the AI tools you use
Book meetings from the thread
SchedulingBook meetings from the thread
Connect the tools around your inbox
IntegrationsConnect the tools around your inbox
Set labels in plain English
Smart labelingSet labels in plain English
Every keyboard shortcut you expect
Power toolsEvery keyboard shortcut you expect
Know when your message lands
Recent opensKnow when your message lands
See every inbox in one calm view
Unified inboxSee every inbox in one calm view
Bring your team into any thread
Team commentsBring your team into any thread

“Founders remember who got back to them first. Now I'm always that person.”

Priscilla RussoPriscilla RussoInvestor, Redpoint

Choose the plan that fits how you work

ProfessionalFor founders and growing teams that need one intelligent inbox across every account.
$25/user/mo.$30$300 billed annually
$30/user/mo.billed monthly
  • Intelligent drafts and rewrites
  • Multiple inboxes and calendars
  • Automations and reminders
  • iMessage, Slack, voice, and mobile access
Get started Get started
EnterpriseFor larger organizations that need advanced security, controls, and support.
CustomTailored to your organization
  • Everything in Professional
  • SSO and SCIM
  • Guided team onboarding
  • Custom security and data controls
Talk to sales

7 day trial · credit card required · cancel any time

Built with security from the ground up

Your data is encrypted, never used to train AI models, and protected by independently audited controls.

Encrypted in transit and at rest

Your data is encrypted in transit with TLS 1.2+ and at rest with AES 256 encryption.

SOC 2 Type II

Independent auditors evaluate our controls against the AICPA Trust Services Criteria for security and confidentiality.

No training on your data

Your emails are never used to train models. Our agreements require AI providers not to retain them.

Questions & answers

How is Slashy different from Serif?
Serif is an assistant that works inside the Gmail or Outlook client you already have. Slashy is the client itself: a keyboard-first inbox with importance labels, drafts grounded in your meetings and CRM, follow-up tracking, a calendar, and control from iMessage and Slack, on one plan.
Does it prep meetings like Serif?
Yes. Before each meeting Slashy gives you a brief on who you are meeting, the latest threads, and the CRM context, and afterward it can draft the follow-up.
Which CRMs does it support?
Attio, HubSpot, and Salesforce. Slashy grounds drafts in the CRM record, not just your tone.
Which accounts does Slashy work with?
Slashy works with Gmail, Google Workspace, Outlook.com, and Microsoft 365, on web, desktop, and iOS. There is a native Mac app, a fast web app, and a native iOS app, with Android coming soon.
What does it cost?
Slashy is $30 a month, or $25 a month billed annually ($300 a year), for unlimited usage on one plan. The 7 day trial includes every feature, requires a credit card, and can be canceled any time.
Is my email data safe?
Yes. Slashy has completed a SOC 2 Type II audit and encrypts data in transit and at rest. Your email is never used to train AI models, and you can revoke access anytime.

Run Slashy next to Serif for a week

7 day trial · credit card required · cancel any time

Start for freeBook a demo