Write better email replies in seconds.
RepliStack generates polished, accurate replies based on your tone, your writing style, and your product knowledge — in any language.
Account required to track trial usage and subscription. • Privacy-first • Works in every language
Live reply preview
Incoming
Thanks for the update. Can you confirm next steps and timing?
Reply
Absolutely — here’s the plan and the exact timeline. Happy to help.
How RepliStack works
From messy inboxes to clear, ready-to-send replies in three simple steps.
Paste the incoming email
RepliStack analyzes the message instantly — no extra context needed.
Choose tone & length
From friendly and warm to strict professional or zero-BS.
Generate a ready-to-send reply
A clear, well-structured, human-sounding email in one click.
Why people choose RepliStack
Learns your writing style
Train RepliStack with a few of your real emails. All style processing happens locally in your browser.
Knows your product
Paste real customer questions & answers. RepliStack uses ONLY the information you provide to answer similar messages.
Multi-language built-in
RepliStack detects the language automatically and responds in the same language — English, Spanish, French, Romanian, anything.
Consistency at scale
Every reply matches your tone and standards, reducing errors and saving time across your team.
Speed meets clarity
Replies that normally take minutes are now generated in 3 seconds.
Private by design
We store only minimal account, usage, and subscription data. We do not store inbox email threads.
Built for people who write a lot of emails
RepliStack adapts to any industry, any workflow, any language.
Use cases: Solopreneurs, Freelancers, Support Teams, SaaS Founders, Coaches & Consultants
See RepliStack in action
A few example replies generated with different tones and contexts.
Customer Support • Warm human – Medium
Incoming: “Hi, I need help updating my billing info and I'm worried about downtime.”
Reply: “Thanks for reaching out. I can update your billing details right away and keep your account running without interruption. Want me to proceed now?”
Sales Inquiry • Professional – Detailed
Incoming: “Can you outline onboarding steps and expected timing for a 20-person team?”
Reply: “Happy to help. Onboarding typically takes 2–3 days end-to-end, including account setup and team invites. I can share a step-by-step plan and schedule a walkthrough if you’d like.”
HR / Recruitment • Friendly – Short
Incoming: “Is the candidate available for a quick call tomorrow?”
Reply: “Thanks for checking. Yes, I can arrange a quick call tomorrow. What time works best for you?”
Sales follow-up • Zero-BS – Short
Incoming: “Hey, just checking if you had time to look over the proposal. Can we move forward this week?”
Reply: “Hi, thanks for checking in. I’ve reviewed the proposal and I’m aligned with the next steps. If you can send over the final version today, I can confirm by tomorrow and we can move forward this week.”
Personal • Friendly – Short
Incoming: “Can we reschedule our coffee? Something came up tomorrow afternoon.”
Reply: “Hey, no problem at all. Thanks for letting me know. Let me know a couple of new time options that work for you and I’ll pick one that fits my schedule.”
Parent–teacher • Warm human – Medium
Incoming: “I’m a bit concerned about Andrei’s focus in class. Could we find a time to talk this week?”
Reply: “Hello, thank you for reaching out and for sharing your concerns. I appreciate your attention and I’m happy to discuss how we can support Andrei together. Please send me a few time slots that work for you this week and I’ll confirm one as soon as possible.”
Admin & billing • Strict professional – Medium
Incoming: “We noticed a discrepancy between the contract and the latest invoice. Can you clarify the amount?”
Reply: “Hello, thank you for flagging this. You are correct – the amount on the latest invoice does not match the contract. I will cancel the current invoice and issue a corrected one with the agreed amount. I’ll send you the updated invoice shortly for your records.”
Job application • Professional – Medium
Incoming: “Thank you for applying to our open role. Could you share your availability for a first interview?”
Reply: “Hello, thank you for considering my application. I’m available for an interview on Tuesday and Thursday afternoon next week, as well as Friday morning. Please let me know which time slot works best for you, or suggest an alternative, and I’ll confirm as soon as possible.”
Personal • Warm human – Short
Incoming: “Could you water my plants this weekend while I’m away?”
Reply: “Hi, of course, I’d be happy to help. Just let me know if there are any specific instructions for the plants and what time works best for you to drop off the keys.”
Everything you need to reply faster
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.
Your privacy comes first
We do not store your emails on our servers. Email content is sent to OpenAI only to generate the reply.
We store minimal account data, usage counts, and subscription status.
We use Supabase for authentication and database hosting, Stripe for billing, and OpenAI for reply generation.
We do not run product analytics or behavioral tracking.
Reply better. Work faster. Stay consistent.
Start using RepliStack in seconds — account required.