Founder-quality replies without the time sink
RepliStack drafts crisp responses for customers, partners, and investors so you can stay focused on product and growth.
Handle customer, partner, and investor email without losing product focus.
No signup required to try. Account required to track trial usage and subscription. • Privacy-first • Works in every language
See how a founder reply turns into something crisp and ready to send.
Start for freeSee the real product turn an incoming email into a ready-to-send reply in seconds.
Small internal test
Stop writing the same client email again and again.
In a small internal test, 5 client emails took 7:37 manually and 1:39 with RepliStack (~70% faster in this sample).
Real-world examples
Common inbound emails and the replies you can send faster.
Sales follow-up
Incoming: We’re interested, but need confirmation on data residency.
Reply: Thanks for the interest. We support data residency by region. I can share the details for your requirements.
Investor update
Incoming: Can you send a quick status on Q1 milestones?
Reply: Absolutely. We hit onboarding improvements and raised activation. I’ll send a brief summary with metrics today.
Onboarding question
Incoming: How long does setup take for a 20-seat team?
Reply: Setup typically takes 1–2 days. I can provide a step-by-step plan and help coordinate rollout.
Built for SaaS founders who write a lot of emails
RepliStack adapts to your workflow and keeps replies consistent.
Explore other use cases: Solopreneurs, Freelancers, Support Teams, Coaches & Consultants
How it works
Three quick steps to a polished reply.
Paste the incoming email
Drop in the message you need to answer. No templates required.
Generate a reply
Get a clear, on-tone draft in seconds.
Edit and send
Tweak if needed, then send or copy into your inbox.
Simple pricing for everyone
Start with a free trial, then upgrade when RepliStack becomes part of your daily workflow.
Free trial
- Generate AI replies after login
- Free trial — 100 replies total
- All tones and languages
- Train your writing style locally
- Support knowledge base stored in your browser
Perfect to test RepliStack and see if it fits your workflow.
Pro
- Everything in Free
- Unlimited replies
- No usage limits
- Priority improvements based on your feedback
- Early access to new smart features
Best for people who rely on email every day and want consistent, high-quality replies.
Questions about pricing?
Do I need an account to use RepliStack? Yes, the app now uses secure account-based usage tracking.
Does RepliStack store my emails? We do not store your emails on our servers. Email content is sent to OpenAI only to generate the reply.
What data is stored? We store minimal account data, usage counts, and subscription status.
Can I change plans later? Yes, you can upgrade to Pro whenever you need unlimited generations.
Privacy-first by design
We use Supabase for authentication and database hosting, Stripe for billing, OpenAI for reply generation, and Vercel Web Analytics plus Google Analytics for public-site measurement.
- Account required to track trial usage and subscription.
- We store minimal account data, usage counts, and subscription status.
- We do not store your emails on our servers. Email content is sent to OpenAI only to generate the reply.
- Google Analytics only runs if you accept analytics cookies, and you can change that choice later from Cookie settings.
FAQ
Clear answers before you try it.
Will this replace our support tool?
No. RepliStack drafts replies you can paste into any inbox or help desk.
Can I use it for investor or partner updates?
Yes. It drafts clear, confident messages while keeping your voice consistent.
Does it help with customer onboarding?
Yes. It turns common onboarding questions into ready-to-send replies.
Is data stored anywhere?
We store minimal account data, usage counts, and subscription status. We do not store your emails on our servers. Email content is sent to OpenAI only to generate the reply.
When should I go Pro?
If you rely on daily replies across customers and stakeholders, Pro removes limits.
Founder-quality replies without the time sink.
Keep the message clear, keep the context, and get back to product work faster.