01Use case
Upsell
Agent opener
“On the basic module. Maintenance add-on available.”
Agent calls customers using one part of your product to introduce the next tier or module. Books a 15-min upgrade call with your CS rep if interested.
For bootstrapped indie SaaS founders
Stop renting traffic.
Work the database you own.
One agent. Four channels.
Booked expansion calls in 48 hours.
No deck. No demo. We run your audit math live on the call.
One agent. Four channels.
CSV in. Calls out. 48h.
Calendar invites. Not leads.
Email summaries. No dashboard.
4
channels, one memory
48h
CSV to first reply
30
calls per 5,000-row CSV
0
dashboards
The math
5,000 paid customers.
30 booked upgrade calls.
This isn't cold outbound. It's expansion revenue from accounts that already swiped a card. You'd recover this revenue eventually, or you'd lose it to churn. We make it happen now. Acquiring a new customer costs roughly 5 to 25 times more than retaining or expanding an existing one (Bain, Prescription for cutting costs), and a 5% lift in retention can lift profit 25 to 95% (Harvard Business Review).
Worksheet
- Customers in your CRM
- 5,000
- Not contacted in 90+ days
- 2,500
- Pick up the WhatsApp / SMS / voice conversation
- ~15%
- Agree to a booked upgrade conversation
- ~8%
- Booked expansion conversations
- 30
- Average expansion value
- [your ACV]
- Recovered revenue from one campaign
- [your number]
Pick-up rate (~15%) and book rate (~8%) anchored to HubSpot State of Marketing and Twilio State of Customer Engagement multi-channel benchmarks. Your numbers vary by segment, offer and database hygiene. Run the audit on the strategy call for your specific math.
The shape
30
Booked upgrade conversations from a 5,000-row CSV in the first campaign window.
Multiply by your average expansion value to get your recovered revenue. We build the exact projection for your database on the 20-minute strategy call.
Run the auditWhat the agent calls about
Five jobs. One agent.
02Use case
Win-back
Agent opener
“Churned 2 months ago. Anything changed?”
Agent calls recently-churned customers with a structured win-back offer. Logs reasons for non-return into your CRM.
03Use case
Renewal nudge
Agent opener
“Annual is up in 30 days. Any blockers?”
Agent calls accounts with renewal approaching. Surfaces objections before they show up in the cancellation flow.
Cross-sell and retention check-ins ship with the same agent, same memory. See all five use cases →
“
I can't justify hiring even one SDR at €5K a month. But I cannot personally call 4,000 customers either.
Indie SaaS founder · 4,000+ paid customers
How it works
Four steps. 48 hours.
From CSV to first outbound message. No software you configure. No course you study.
01Day 0
Send your CSV
Customers, no-shows, dead leads, lapsed policies. We only work data you legitimately own. No cold-list outbound.
Output
Signed data-processing agreement
02Day 1-2
We brief the agent
Your offer, your tone, your hand-off rules, your calendar. You sign off on every line of the script before it sends a single message.
Output
Signed-off prompts and test runs
03Day 3 onward
Four channels run in parallel
WhatsApp Business + SMS + voice + email. One agent picks the next channel based on each contact's reply behaviour. Replies on WhatsApp? Stay there. Ignores 2 SMS? Try voice. Voice rings out? Voicemail + email.
Output
Live multi-channel campaign
04Continuously
Booked conversations land
Each qualified reply books straight to your calendar with full transcript + summary email. You close. Weekly written progress report from the operator.
Output
Calendar invites + summary inbox
Killer feature
When a customer calls back, the agent remembers.
Outbound is the easy half. The hard half is the customer who calls back from a different mood. CallHush recognizes the phone, loads the prior transcript, and picks up where the last call left off.
One conversation, two days, three touches
- Tue 10:14Outbound from the agentAgent calls customer about a cross-sell opportunity. Customer says 'call me back Thursday afternoon, in a meeting.'
- Tue 10:16Self-scheduled callbackAgent books itself for Thursday 14:00. Logs the context. No human in the loop.
- Thu 09:47Customer calls in firstSame customer dials the agent's number from their mobile. Agent recognizes the phone hash against the CRM.
- Thu 09:47Picks up where it left off'Hi, glad you called back. Last time we were talking about the team plan. Did you get a chance to think about it?' Same memory, same tone, no restart.
One agent. Four channels. One memory.
WhatsApp Business + SMS + voice + email follow-up. The agent picks the next channel from each contact's behaviour. Replies on WhatsApp? Stays there. Ignores two SMS? Tries voice. Rings out? Drops a voicemail plus follow-up email.
Multi-channel response benchmarks: HubSpot State of Marketing 2024 · Twilio State of Customer Engagement 2024
What you actually get
Deliverables. Not feature bullets.
Outbound agent on your customer database
Named, gendered, tone-tuned. Calls customers on your schedule for upsell, cross-sell, retention, win-back or renewal.
Warm inbound callback recognition
When a customer dials the agent's number back, the agent recognizes the phone and loads the prior conversation. No restart.
Hot-lead email to the founder
Customer name + phone + CRM ID + 3-line summary + full clean transcript + booked meeting on your calendar.
Compliance baked in
TCPA + GDPR + EU AI Act Article 50 disclosure on every call. Recording auto-delete, RTBF endpoint, EU residency default.
Who this is for
Not for everyone. That's intentional.
This is for you if
- Indie B2B SaaS founder, €100K-€2M ARR, 1,000+ paid customers
- Vertical micro-SaaS with expansion revenue stranded in your CRM
- No internal sales team, no budget to hire one
- You own the data: customers, prior buyers, no-shows, opt-in subscribers
This is NOT for you if
- Pre-revenue or sub-€50K ARR (database too small)
- Enterprise procurement with 6-month cycles
- Cold-list outbound on data you don't own
- Self-serve software seekers (CallHush is service, not platform)
Pilot. Sprint. Retainer.
Sized on the call.
We size the pilot to your database, channel mix and average expansion value. The number lands on the 20-minute strategy call, after we run the audit math on your shape.
Pick a slot.
We run your audit math live on the call. No deck. No demo.
Calendar loaded from Cal.com · Free 20-minute strategy call · No application gate
Calendar not loading? Book directly at cal.com/justas-butkus-dviqey/free-ai-consultation2.
Honestly answered.
No. CallHush only works data you legitimately own: existing customers, prior buyers, no-shows, expired quotes, lapsed policies, opt-in subscribers. Cold outbound to scraped or purchased lists is not a service we offer. The reactivation outcome only works when there's prior intent in the database anyway.
Each contact has a behaviour signal. Replies on WhatsApp? Stay there. Ignores 2 SMS in 72 hours? Try a voice call. Voice rings out? Drop a voicemail plus follow-up email. The agent reads delivery + open + reply signals across channels and decides the next move per contact, not per campaign.
Every campaign ships with region-specific dial-time and consent rules baked in (TCPA in the US, ICO/PECR in the UK, EU AI Act Article 50 transparency disclosure in the EU). The AI discloses it is an AI on every call. We require a signed data-processing agreement before any data is touched. EU residency available on request.
HubSpot, Salesforce, Pipedrive, Close, Go High Level, Attio, Microsoft Dynamics, and any CRM with a REST API or webhook. Calendars: Cal.com, Calendly, Google Calendar, Microsoft 365. Integration scope is confirmed on the strategy call.
Yes. BYO numbers and BYO WhatsApp Business API are both supported. Most pilot clients use ours for speed (24h provisioning), then port to BYO once the unit economics are validated.
English by default. Spanish or French on request, with a short prompt-tune cycle on our side. Other languages are scoped per client.
48 hours from a signed pilot to the agent sending its first outbound message. Three days to first booked conversation on a typical 1,000-contact pilot. The pilot guarantee is 5 booked conversations inside 14 days.
We pace the campaign to your team's capacity. If your reps can close 5 calls a week, the agent paces for 5 calls a week. If you want fire-hose mode, we run fire-hose mode. The point is booked conversations, not unread inboxes.
You do. Every conversation exports to JSON or CSV weekly. We hold a copy for QA during the active engagement, then delete from our side on request. EU-residency storage available by default for EU clients.
Yes. We define hand-off triggers per client up front (the customer asks for a human, an objection outside the agent's scope, an explicit deal-size threshold). When the trigger fires, the agent warm-transfers to your rep with the full context summary, or schedules a 15-minute human follow-up if no one is available right then.
The agent introduces itself transparently as an AI on every call. Before scaling, we run ten test calls with you and your team watching, so you sign off on tone and behaviour. If a customer pushes back hard, the agent hands off, marks the contact as 'human-only' in your CRM, and never auto-dials them again. Most customer pushback we see is on bad scripts, not on the AI itself.
Scroll to the booking section, pick a slot on the embedded calendar, and you are on the founder's calendar. No application form, no qualification gate from us, no waiting on a manual review. If you fit the pass thresholds shown above the calendar (1,000+ paid customers, €100K+ ARR, founder-decides-alone), the call will be useful for both of us.
Stop renting traffic.
Work the database you own.
One agent. Four channels. Booked expansion calls in 48 hours.