Your AI MVP,
live in 21 days.
Kesteral designs and builds production-ready products for ambitious teams, with deep experience in voice AI and autonomous agents.
Built by an engineer who ships production AI every day
- 8products built
- 3live today
- 1.85M+items kept queryable
- 0.9son-device speech to text
AI products that do real work.
We design the interface, build the system, and wire up the intelligence behind it, in 21 days.
Voice agents
that book the job
Phone and web agents answer every call, qualify the caller, and book it straight into your tools.
Live calls
4 active- +1 (415) 555-0187In call · 00:42
- +1 (628) 555-0123Queued · 2 min
- +1 (650) 555-0199Queued · 4 min
- +1 (415) 555-0166Voicemail
Jamie Smith
00:42- Jamie SmithHi, I'd like to book a dermatology appointment.
- AI agentOf course. Do you have a preferred day or time?
- Jamie SmithNext Tuesday morning works.
- AI agentDone. You're booked for Tue, Jun 17 at 9:00 AM.
Appointment booked
Tue, Jun 17 · 9:00 AM
Confirmation sent
Includes
- Realtime voice
- Call routing
- CRM actions
- Voicemail
Agents that
research and draft
Agents search, reason, and cite their sources, then wait for a person to approve before anything ships.
Research task
Find the two best new markets for expansion, with demand and hiring data.
- Web search
- Analyze data
- Draft recommendation
- Human review
Cited sources
- 1U.S. BLSEmployment by metro
- 2IBISWorldIndustry market size
- 3City of AustinIncentives and permits
+2 more sources
Draft for approval
Recommendation
Expand into Austin, TX and Raleigh, NC.
- • Strong demand growth
- • Lower operating costs
- • Deep hiring pool
Includes
- RAG
- Tool use
- Citations
- Human review
Full products,
not prototypes
The polished app around the intelligence: booking, dashboards, sign-in, billing, and deployment.
Clearway
Book a visit
June 2026
Clearway
Appointments
Customers
Analytics
Appointments
Includes
- Web apps
- Mobile
- Integrations
- Production ready
Seven products we designed.
Concepts, not client work. Open one to see the full page.
Your 21 days,
day by day.
Five steps, each with something you can see and use. Short daily updates. No black box.
- 01 Scope callDay 1A one-page scope
- 02 Clickable prototypeDays 2–5A prototype to approve
- 03 BuildDays 6–16A live staging link, updated daily
- 04 Test and polishDays 17–20A launch-ready version
- 05 LaunchDay 21A live product you own
“You work with me directly, from the first call to launch. The person who scopes your product is the person who builds it.”
Manish Singh
Founder, Kesteral · voice AI and agents engineer
Pricing that fits
what you're building.
Every product is different, so we shape the price around your scope and stage. Tell us what you're building and let's talk it through.
The sprint
21-day MVP
One focused product outcome, designed, built and launched.
- Strategy and UX
- Full-stack build with voice AI or agents
- Deployment, source code and 30 days of fixes
After launch
Product partner
Keep shipping with the same team, month to month.
- Priority improvements
- Monitoring and tuning
- Cancel anytime
Let's build
Tell us what you want to launch.
Two sentences is enough. We reply within a working day.
Or book a free 15-minute call
15 min
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