Skip to content

Coval vs Letterbook

See how their public offers line up before you choose your own position. Prices stay in the currency, billing schedule, and charged unit each vendor publishes.

USD · US · source: www.coval.ai

Plan Pricing Charged by Offer type
Starter
USD 100 monthly

$ 100 /mo Billed monthly

Flat · /mo Billed monthly Standalone · Fixed
Growth Highlighted
USD 500 monthly

$ 500 /mo Billed monthly

Flat · /mo Billed monthly Standalone · Fixed
Enterprise
USD 4500 / month with annual commitment

Custom Starting at $4,500/month

Flat · /month Standalone · Starting at

USD · US · source: www.letterbook.ai

Plan Pricing Charged by Offer type
Starter — default
USD 50 monthly · USD 50 / month with annual commitment

$50 per month

Flat · per month Standalone · Fixed
Growth — default Highlighted
USD 200 monthly · USD 200 / month with annual commitment

$200 per month

Flat · per month Standalone · Fixed
Enterprise — default
Contact sales

Let's talk per month

Flat · per month Standalone · Contact sales

What each plan includes

Feature names follow each vendor’s own pricing page, so verify the wording before treating them as exact equivalents.

Coval

Starter

Usage Limits

Simulation minutes / mo

100

Limited

Usage Limits

Monitored calls / mo

1,000

Limited

Usage Limits

Trace retention

30 days

Limited

Usage Limits

Concurrent simulations

5

Limited

Usage Limits

Projects

1

Limited

Usage Limits

Seats

Unlimited

Included

Usage Limits

Overage per simulation minute

$0.40 / min

Included

Usage Limits

Overage per monitoring minute

$0.10 / min

Included

Models & Intelligence

Test scenario library

Industry starter packs

Included

Models & Intelligence

Voice models

Basic

Included

Models & Intelligence

Metrics per call

10

Limited

Models & Intelligence

Persona library

10

Limited

Developer Surface

Webhooks

5 / project

Limited

Developer Surface

Rate limits

60 req/min

Limited

Security & Compliance

SAML SSO

Excluded

Security & Compliance

SCIM provisioning

Excluded

Security & Compliance

Role-based access control

Basic

Limited

Security & Compliance

Audit logs

Excluded

Security & Compliance

IP allowlisting

Excluded

Security & Compliance

Data residency

Excluded

Support & Success

Onboarding

Self-serve

Included

Support & Success

Support channel

Community + email

Included

Support & Success

SLA

Excluded

Support & Success

Regular progress calls + Quarterly business review

Excluded

Billing & Terms

Annual discount

20% off

Included

Growth

Usage Limits

Simulation minutes / mo

1,000

Limited

Usage Limits

Monitored calls / mo

10,000

Limited

Usage Limits

Trace retention

90 days

Limited

Usage Limits

Concurrent simulations

25

Limited

Usage Limits

Projects

5

Limited

Usage Limits

Seats

Unlimited

Included

Usage Limits

Overage per simulation minute

$0.25 / min

Included

Usage Limits

Overage per monitoring minute

$0.05 / min

Included

Models & Intelligence

Test scenario library

Starter packs + custom

Included

Models & Intelligence

Voice models

Advanced

Included

Models & Intelligence

Metrics per call

Unlimited

Included

Models & Intelligence

Persona library

50

Limited

Developer Surface

Webhooks

Unlimited

Included

Developer Surface

Rate limits

300 req/min

Limited

Security & Compliance

SAML SSO

Excluded

Security & Compliance

SCIM provisioning

Excluded

Security & Compliance

Role-based access control

Standard

Included

Security & Compliance

Audit logs

30 days

Limited

Security & Compliance

IP allowlisting

Excluded

Security & Compliance

Data residency

Excluded

Support & Success

Onboarding

Kickoff call

Included

Support & Success

Support channel

Priority email + shared Slack

Included

Support & Success

SLA

Excluded

Support & Success

Regular progress calls + Quarterly business review

Excluded

Billing & Terms

Annual discount

20% off

Included

Enterprise

Usage Limits

Simulation minutes / mo

Custom

Included

Usage Limits

Monitored calls / mo

Custom

Included

Usage Limits

Trace retention

Custom

Included

Usage Limits

Concurrent simulations

Custom

Included

Usage Limits

Projects

Unlimited

Included

Usage Limits

Seats

Unlimited

Included

Usage Limits

Overage per simulation minute

Negotiated

Included

Usage Limits

Overage per monitoring minute

Negotiated

Included

Models & Intelligence

Test scenario library

Built with Coval team

Included

Models & Intelligence

Voice models

Custom / BYO

Included

Models & Intelligence

Metrics per call

Unlimited + fine-tuned

Included

Models & Intelligence

Persona library

Custom

Included

Developer Surface

Webhooks

Unlimited

Included

Developer Surface

Rate limits

Custom

Included

Security & Compliance

SAML SSO

Included

Security & Compliance

SCIM provisioning

Included

Security & Compliance

Role-based access control

Custom

Included

Security & Compliance

Audit logs

Custom retention

Included

Security & Compliance

IP allowlisting

Included

Security & Compliance

Data residency

Included

Security & Compliance

DPA and custom security reviews

Included

Security & Compliance

Private / VPC

Included

Security & Compliance

BYO storage

Included

Security & Compliance

White-label report

Included

Support & Success

Onboarding

White-glove + named engineer

Included

Support & Success

Support channel

Dedicated Slack + named engineer

Included

Support & Success

SLA

Custom (up to 99.99%)

Included

Support & Success

Regular progress calls + Quarterly business review

Included

Letterbook

Starter — default

Highlights

Seats

3 seats

Included

Highlights

Tickets per month

300 tickets / month

Included

Highlights

Integrations

Integrate your database & Stripe

Included

Highlights

Inbox

Unified inbox for all your channels

Included

Growth — default

Highlights

Seats

10 seats

Included

Highlights

Tickets per month

1,000 tickets / month

Included

Highlights

Channels and integrations

All channels and integrations

Included

Highlights

Support

Priority support

Included

Enterprise — default

Highlights

Seats

Custom seats

Included

Highlights

Tickets per month

3,000+ tickets / month

Included

Highlights

Security

SSO & SAML

Included

Highlights

Account management

Dedicated account manager

Included

How their prices changed

Each date shows when a public price was observed, not when it took effect. An archived region or currency can differ, so a currency change is not necessarily a price increase.

Coval

    • Starter: USD 100 monthly
    • Growth: USD 500 monthly
    • Enterprise: USD 4500 / month with annual commitment
    • Starter — monthly: USD 100 monthly · USD 80 / month with annual commitment
    • Growth — monthly: USD 500 monthly · USD 400 / month with annual commitment

Letterbook

    • Starter — default: USD 50 monthly · USD 50 / month with annual commitment
    • Growth — default: USD 200 monthly · USD 200 / month with annual commitment
    • Enterprise — default: Contact sales