Best Alternatives to Letter AI

Kustomer is an AI-powered customer service CRM platform providing a unified customer history view and conversational support tools for e-commerce, retail, and direct-to-consumer br

Spiff (now Salesforce Spiff) is a sales commission management and incentive compensation platform automating the calculation, payment, and transparency of sales commissions for rev

Front is a customer operations platform combining a shared inbox, CRM, and team collaboration tools to help businesses manage high-volume customer communications across email, SMS,

Walnut is a Tel Aviv, Israel-based interactive sales demo platform — backed by Y Combinator (W20) with $56 million in total funding including a $35 million Series B in January 2022

Openmart is a San Francisco-based local business intelligence platform — backed by Y Combinator (W24) with $15.2 million in total funding including a $2.75 million seed in August 2

Fiber AI is a San Francisco-based AI B2B prospecting and data platform — backed by Y Combinator (S23) with seed funding from TRAC, Y Combinator, and Soma Capital — providing GTM te

Retell AI is a voice AI infrastructure platform providing APIs and tools for building conversational AI phone agents with low latency, natural turn-taking, and integration with maj

Help Scout is a remote-first customer service platform providing email-based shared inbox, knowledge base, and live chat tools for small and mid-size businesses — designed around t

DryMerge is a San Francisco-based AI CRM automation platform that eliminates manual data entry by monitoring emails, calendar events, and business activities and automatically upda

AiSDR is an AI-powered sales development representative (SDR) platform that automates outbound prospecting, personalized email outreach, and follow-up sequences for B2B sales teams

Voicepanel is a San Francisco-based AI customer research automation platform — backed by Y Combinator (W24) with $2.4 million in seed funding in May 2024 led by Y Combinator, Rebel

Circleback is a San Francisco-based AI-powered meeting notes and action tracking platform — backed by Y Combinator (W24) with $3 million in total funding including a $2.5 million s

Octolane AI is a San Francisco-based AI-native CRM platform — backed by Y Combinator (W24) with $3.1 million in total funding including a $2.6 million oversubscribed seed in April

Opencall.ai is a California-based AI voice automation company that deploys intelligent phone agents for service businesses — handling inbound calls to answer common questions, book

Leaping AI is a voice AI platform building autonomous agents that handle inbound and outbound phone calls for contact centers — replacing repetitive call center workflows with LLM-