Alternatives
10 best Kastle alternatives
Tools that cover the same task as Kastle (assistant), ranked by how completely their pricing, free tier and API access are documented. Checked Oct 4, 2026.
- Kastle starts at
- Not listed
- Free plan
- Free tier unknown
- API
- API unknown
- 01
Airtable AI
Airtable is a collaborative app-building platform that embeds AI across databases, interfaces, automations, and agents. Teams use it to connect operational data, build no-code workflows, and apply AI to reporting, content, and cross-app integrations at scale.
Best for: Operations, marketing, and product teams that want AI-assisted workflows on structured data with interfaces and automations.
- 02
REVE Chat
REVE Chat combines AI agents, live chat, visual chatbots, ticketing, WhatsApp campaigns, and voice bots for omnichannel customer engagement. Plans scale seats, AI conversation credits, and voice minutes for support and sales teams.
Best for: Ecommerce and service teams automating support across web chat, social, WhatsApp, email, and voice.
- 03
Aphid
Aphid lets users create digital AI Clones that operate on their behalf across the Aphid Network and connected environments. Clones handle dialog workflows, scheduling, and routine client touchpoints while owners retain IP over ingested data.
Best for: Freelancers, gig workers, and small businesses who want autonomous digital stand-ins for repetitive online interactions.
- 04
Dapta
Dapta provides AI voice and text agents for SMB sales workflows, including reception, lead qualification, follow-ups, and customer support. Teams connect CRMs such as HubSpot, GoHighLevel, or Salesforce to automate calls, WhatsApp messages, and sequences.
Best for: SMB sales, operations, and support leaders who want callable and text AI agents without building telephony from scratch.
- 05
CallHippo
CallHippo is an AI-driven business communication platform combining cloud phone systems, outcome-based voice agents, WhatsApp Business API tools, parallel dialers, and an omnichannel inbox. It targets teams that want calling, messaging, and automation in one stack with transparent published plans.
Best for: Sales, support, and operations teams needing virtual phone numbers, AI agents, WhatsApp, and unified messaging with per-user pricing.
- 06
AI Box
AI Box is a multi-model AI workspace for chat, image, audio, and video generation across 100+ models with token allowances, cloud storage, and workflow builders. It also exposes an MCP server so external agents such as Claude or ChatGPT can run Box workflows.
Best for: Teams that want one subscription to compare models, run workflows, and connect chat agents via MCP instead of juggling many vendor accounts.
- 07
Bigly Sales
Bigly Sales provides fully managed AI outbound and inbound calling for sales teams across 30+ industries. The platform covers numbers, registration, compliance, CRM integration, and live warm transfers with tiered minute and call bundles plus overage fees.
Best for: High-volume sales organizations that want outsourced AI voice outreach with compliance guardrails.
- 08
CREAO
CREAO builds autonomous AI agents that connect to existing business tools, run on schedules, and compound organizational knowledge. Users describe workflows in plain language to spawn agents for quotes, ads, inventory snapshots, SEO briefs, video generation, image creation, voice output, and browser automation with optional human approval gates.
Best for: Operators, marketers, and small teams who want recurring AI agents wired into email, sheets, Slack, and other SaaS stacks.
- 09
2Slash
2Slash is a browser extension that injects prompt-free AI assistance into text fields for writing, summarizing, and light image generation. It bundles multiple model providers and preset workflows so users can draft content in place across the web.
Best for: Operators living in email, CMS, and support tools who want inline AI without opening a separate chat tab.
- 10
Sauna
Sauna is a proactive AI teammate that learns how you work, remembers connected context, and acts across email, documents, Slack, iMessage, and thousands of integrations. It researches, follows up, and can build lightweight apps from natural-language requests.
Best for: Individuals and teams who want a persistent AI coworker across chat surfaces with shared memory and automations.
Kastle alternatives: common questions
What is the best free alternative to Kastle?
Airtable AI has an ongoing free plan. Personal plan is free forever for up to two users with unlimited tasks, projects, and 100+ integrations. Free plans change, so check the vendor before relying on one.
What is the cheapest Kastle alternative?
AI Box has the lowest listed starting price at $7.25/mo.
Which Kastle alternatives have an API?
Airtable AI, Dapta, AI Box, Bigly Sales, CREAO mention API or developer access.