Top 6 of 22 researched candidates
Alternatives to Kalyvox
Find a better fit for what you need. Compare alternatives to Kalyvox with sourced features, strengths and trade-offs side by side.
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Evidence-backed shortlist
Closest researched alternatives to Kalyvox
Ordered by the requirements met, strengths preserved, explicit trade-offs and research coverage. Sponsorship does not enter the order.
- 01
ElevenLabs Agents
Hosted platform for building voice and chat agents, with telephony, SDKs and a choice of LLM.
From FreeWhy it's on this listGPT · YesOpenAI models are natively supported and are the one provider family the vendor says stays fully available under EU data residency.Evidence ↗
Where it improves on Kalyvox
- +Model choice · YesYou pick the model per agent, plus a backup cascade; LLM usage is billed on top of the plan and varies by model.Evidence ↗
- +Self-hosted · PartialThe full agent runtime can run in your own VPC or hardware on AWS or GCP, but the documentation is NDA-gated and sold through the account team; Azure is unreleased.Evidence ↗
Trade-offs against Kalyvox
- −Getting out · PartialAgents, tools and tests pull down as files via the CLI and conversations are readable over the API, but unused paid credits expire on cancel or downgrade and rollover caps at two months.Evidence ↗
35/35 researched criteria - 02
Synthflow
Enterprise voice AI platform with in-house telephony for inbound and outbound call automation.
From FreeWhy it's on this listGPT · YesThe model selector lists GPT-4o, GPT-4.1 and multiple GPT-5 variants for agent responses.Evidence ↗
Where it improves on Kalyvox
- +Model choice · PartialYou pick the model per agent, but only from Synthflow's list of GPT and Synthflow LLM options.Evidence ↗
- +Free tier · YesYou can build an agent at no cost; charges begin at launch on a pay-as-you-go basis.Evidence ↗
Trade-offs against Kalyvox
- −Seat model · NoPricing is scoped on call volume and concurrency, not on seats; workspace members are governed by roles instead.Evidence ↗
- −Getting out · PartialManual CSV export of call logs is available to all; scheduled exports to S3, BigQuery or SFTP are Enterprise-only, and unused minutes carry over only if the agreement says so.Evidence ↗
35/35 researched criteria - 03
Vapi
Developer platform for building, testing and deploying voice AI agents that make and receive phone calls.
From $0.05/minuteWhy it's on this listGPT · YesOpenAI GPT models are selectable as the assistant's LLM.Evidence ↗
Where it improves on Kalyvox
- +Model choice · YesYou choose transcriber, LLM and voice independently and can swap any of them.Evidence ↗
- +Self-hosted · PartialSelf-serve is hosted only; on-premise is offered to large enterprises, and the orchestration layer otherwise never leaves Vapi.Evidence ↗
Trade-offs against Kalyvox
- −Agent permissions · PartialTools fire mid-call without human approval; a per-tool rejection plan is the mechanism that withholds an action.Evidence ↗
- −Seat model · NoNothing is priced per seat: the plan table meters call minutes and concurrent lines only, and members are invited with RBAC roles.Evidence ↗
35/35 researched criteria - 04
OmniDimension
No-code platform for building voice AI agents and running them on phone, web chat, WhatsApp, email and SMS.
From $15/monthWhy it's on this listGPT · YesOpenAI models are the largest block in the published catalogue, offered both directly and through Azure, and the agent API accepts them by name.Evidence ↗
Where it improves on Kalyvox
- +Model choice · YesYou choose the speech-to-text, LLM and text-to-speech provider per agent and may mix them freely; the vendor does not pin you to one stack.Evidence ↗
- +API access · YesA documented REST API with a Bearer key covers agents, calls, campaigns, numbers and analytics, with Python, TypeScript and browser SDKs and a downloadable OpenAPI spec.Evidence ↗
Trade-offs against Kalyvox
- −Agent permissions · PartialThe agent acts alone inside limits you write in advance: natural-language transfer and hang-up conditions, a hard call-length ceiling and per-campaign calling hours, so escalation is pre-configured rather than requested mid-call.Evidence ↗
- −Getting out · PartialUnused balance survives plan changes and top-ups with no published expiry, and transcripts and recordings can be pulled through the call-logs API, but deletion is a manual email request and no bulk account export is documented.Evidence ↗
35/35 researched criteria - 05
Retell AI
Pay-as-you-go platform for building, testing and running AI phone, chat and SMS agents.
From $0.07/minuteWhy it's on this listGPT · YesMultiple GPT tiers are offered as conversation models, each with its own per-minute rate and an optional faster tier for lower latency.Evidence ↗
Where it improves on Kalyvox
- +Model choice · YesYou pick the conversation model per agent from a published, per-minute-priced list, and you can substitute your own model entirely through the custom-LLM WebSocket.Evidence ↗
- +API access · YesA documented REST API with Node.js and Python SDKs covers agents, calls, phone numbers and chats, and it is listed as included on the entry pay-as-you-go plan.Evidence ↗
Trade-offs against Kalyvox
- −Agent permissions · PartialProhibited-topic guardrails screen both the agent's replies and user input, and tools are explicitly wired per node, but guardrails only swap in a placeholder message rather than stopping or escalating the call.Evidence ↗
- −Seat model · NoNothing is charged per user: the published rate card meters minutes, messages and monthly items like phone numbers and concurrency, so team size does not change the bill.Evidence ↗
34/35 researched criteria · 1 not established - 06
TelEcho
Conversational AI platform for voice and messaging agents that run customer calls and update connected systems.
From $0.07/minuteWhy it's on this listGPT · YesGPT is the platform's reasoning layer: the pricing calculator meters GPT-5, GPT-5 Mini, GPT-5 Nano, GPT 4.1 and GPT 4.1 Mini, and OpenAI is the sole LLM provider named in the sub-processor table.Evidence ↗
Where it improves on Kalyvox
- +Model choice · PartialYou choose the telephony carrier, the STT engine, the TTS voice and the execution pipeline, but every LLM option in the calculator comes from one vendor, so model choice stops at OpenAI.Evidence ↗
- +MCP server · YesTelEcho documents a native MCP integration letting an agent inside ChatGPT or Claude define and configure TelEcho agents; no server address, tool inventory or auth flow is published to verify scope.Evidence ↗
Trade-offs against Kalyvox
- −Seat model · NoNothing is priced per seat: users are invited into one account and charges follow minutes, so there is no published per-user fee, no seat floor and no seat ceiling, only 'limited team access' on Build.Evidence ↗
- −Getting out · PartialYou keep ownership of recordings and transcripts, may request a copy of personal data and can set retention yourself, but no self-serve bulk export is documented and metrics export is an Enterprise line; billing is metered, so no prepaid credits can expire.Evidence ↗
31/35 researched criteria · 4 not established
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How the shortlist is calculated
Comparable first. We consider listings in the same category as Kalyvox and alternatives previously researched for this page.
Requirements first. We prioritise your selected needs, then shared strengths, fewer documented trade-offs, more complete research and finally alphabetical order.
Unknown remains unknown. Missing evidence is never converted into a benefit or a trade-off. Every improvement shown above comes from the same sourced criterion as the listing.
Independent order. Payment does not affect selection or ranking. Paid placements are labelled Advertisement.
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