# Alternatives to Aissist.io

> Source: https://theagentsindex.com/aissist/alternatives/ (re-verified)
> Updated: 24 October 2026

## At a glance

| Name | Best for | Starts at | Better than Aissist.io at | Checked |
| --- | --- | --- | --- | --- |
| [Aissist.io](https://theagentsindex.com/aissist.md) | SMB and mid-market support and sales teams keeping their existing helpdesk | Free, then $0.09/interaction | — | 24 October 2026 |
| [Cresta](https://theagentsindex.com/cresta.md) | Large enterprises running high-volume | On quote | Done-for-you service, API access | 13 September 2026 |
| [Sierra](https://theagentsindex.com/sierra.md) | Large enterprises that want branded, autonomous customer agents that resolve issues end to end and are willing to run a managed engagement. | On quote | Done-for-you service, Agent permissions | 26 September 2026 |
| [AiZipZap](https://theagentsindex.com/aizipzap.md) | trades, freelancers and IT teams that field vague customer enquiries by email | Free, then $9/month | Done-for-you service, Getting out | 19 October 2026 |
| [Ada](https://theagentsindex.com/ada.md) | Enterprises that want a long-running, well-capitalized AI support agent vendor with a public V2 REST API and an MCP server, rather than a sales-only integration surface. | On quote | Done-for-you service, API access | 20 October 2026 |
| [Crescendo](https://theagentsindex.com/crescendo.md) | Mid-market and enterprise support teams that want a fully outsourced, compliance-ready AI-native CX operation, including live channels, without staffing or building one in-house. | On quote | Done-for-you service, Agent permissions | 12 September 2026 |

## What to watch for

- **Cresta**: Full-platform pricing (AI Agent, Conversation Intelligence, Knowledge Agent) is not published, only the narrower Agent Assist SKU has any public price.
- **Sierra**: No public sign-up, pricing page or self-serve API, access is via an enterprise sales engagement.
- **Ada**: Enterprise, sales-led only. No self-serve signup, no public pricing and no free trial.
- **Crescendo**: No public API, no self-serve signup, no free trial. Every engagement starts with a sales-led pilot.

The ones people open most here come first, then the closest matches.

## Shortlist

### 1. VeraDial

AI receptionist and verified US/Canadian business line that answers calls and texts and places outbound calls.

**Where it improves on Aissist.io:**
- [Seat model: yes — Seats are not charged for but they are capped: the owner plus one teammate on Plus and up to three on Business, with each teammate getting their own login and assigned lines.](https://veradial.com/pricing.md)
- [Getting out: partial — Deletion is immediate and thorough and numbers are released back to the carrier, but no bulk export of calls, transcripts or messages is documented — the read-only connector is the nearest thing to a data-out path.](https://veradial.com/delete-account)

**Trade-offs against Aissist.io:**
- [Claude: no — Claude is supported only as a client that reads your account through the MCP connector; the vendor's own complete list of voice providers for AI calls does not include Anthropic, so Claude does not drive the conversations.](https://veradial.com/privacy)
- [Free tier: partial — There is no standing free plan, which the vendor states outright, but Vera Lite and Vera Plus each open with a 7-day free trial on capped minutes, Vera Business starts paid with no trial, and a browser demo needs no signup.](https://veradial.com/pricing.md)
- [Admin controls: partial — The owner controls which lines each teammate may touch and keeps billing and business settings to themselves, and can force review of every AI reply — but there is no policy engine beyond those switches.](https://veradial.com/faq)

[View VeraDial](https://theagentsindex.com/veradial)

### 2. Kalyvox

AI phone receptionist that answers inbound calls, qualifies them, transfers or books appointments.

**Where it improves on Aissist.io:**
- [Done-for-you service: partial — You configure and run the software yourself on Solo and Pro, where onboarding is self-service; only the Business plan adds assisted onboarding and a dedicated account manager, and even there the vendor is not running call flows as a service.](https://kalyvox.ai/en/pricing)
- [Agent permissions: yes — What the assistant may do is bounded by configuration: call reasons, questions, transfer rules and business information you enter, and the vendor publishes deliberate limits including refusing to answer outside that scope or to place outbound calls.](https://kalyvox.ai/en/features)
- [Seat model: yes — Seats are the main plan differentiator with a hard ceiling on the lower tiers: one user on Solo, up to five on Pro, unlimited on Business, and the seat count does not change the per-minute usage rate.](https://kalyvox.ai/en/pricing)

**Trade-offs against Aissist.io:**
- [GPT: partial — The only model-vendor disclosure anywhere on the site is a sub-processor entry naming OpenAI for voice processing and transcription; there is no plan row, docs page or settings screen that offers GPT as a selectable model, so this is a supply-chain fact rather than a supported-model claim.](https://kalyvox.ai/en/privacy)
- [Free tier: partial — You can start without talking to sales or entering a card, but only for seven days: there is no standing free plan, and after the trial you either pick a paid plan or the account pauses.](https://kalyvox.ai/en/help/facturation-et-abonnement)
- [Admin controls: partial — Admins constrain behaviour through roles and permissions, system instructions, transfer rules and the data scope shared with ChatGPT, but the vendor documents no policy engine, approval workflow or spend control.](https://kalyvox.ai/en/features)

[View Kalyvox](https://theagentsindex.com/kalyvox)

### 3. Mixdesk

Omnichannel customer engagement platform with AI Agents for support, sales and lead qualification.

**Where it improves on Aissist.io:**
- [Model choice: partial — The built-in AI Agent gives no model picker, but you can route conversations to a Dify or Coze bot you built yourself, including a self-hosted Dify deployment, where the model choice is yours.](https://mixdesk.com/help/en/docs/dify/)
- [Bring your own key: partial — You cannot supply your own inference key to the native AI Agent, but connecting a Dify or Coze bot means pasting your own provider API key, and a self-hosted Dify also takes your own API URL.](https://mixdesk.com/help/en/docs/dify/)
- [Getting out: partial — Conversation history and reports export from the workspace and deletion can be requested by email, but exports and API reads reach back only six months, so older history cannot be taken out.](https://mixdesk.com/help/en/docs/conversation-history/)

**Trade-offs against Aissist.io:**
- [Runs autonomously: partial — AI Agents reply to customers around the clock without a person present, but they only act once assigned through an automation workflow and the vendor tells you to configure a fallback and human handoff.](https://mixdesk.com/help/en/docs/ai-agent/)
- [Multi-agent: partial — You can run several AI Agents with different roles and route conversations to each, but the docs describe one agent per conversation assignment rather than agents coordinating on one task.](https://mixdesk.com/help/en/docs/ai-agent/)

[View Mixdesk](https://theagentsindex.com/mixdesk)

### 4. VoiceFleet

Inbound AI phone receptionist for small businesses: answers calls, captures bookings, escalates urgent callers.

**Where it improves on Aissist.io:**
- [Done-for-you service: partial — You buy and run the software yourself, but the vendor does the initial configuration: setup and onboarding support is a plan row on all three tiers and the pricing page offers founder-led help with greetings, escalation rules and integrations.](https://voicefleet.ai/pricing)
- [Getting out: partial — Export is available during the term and deletion or return happens within about 30 days of termination, but prepaid minute packs and top-ups are non-refundable once applied, so unused balance is lost on exit.](https://voicefleet.ai/terms)

**Trade-offs against Aissist.io:**
- [In a browser: partial — A hosted dashboard is where you configure and review calls, but the analytics dashboard is gated to Growth and Pro and multi-location management to Pro only, so the entry tier gets a thinner web surface.](https://voicefleet.ai/features)
- [Free tier: partial — There is a free way in but no standing free plan: every tier carries a 7-day trial with no setup fee, after which a paid plan starting at EUR 99 per month is the only path.](https://voicefleet.ai/pricing)
- [Admin controls: partial — Constraint is real but coarse: role-based workspace access and restricted administrative access are documented in the DPA, and the customer controls scripts, booking rules and escalation, yet no granular admin policy console or permission matrix is published.](https://voicefleet.ai/dpa)

[View VoiceFleet](https://theagentsindex.com/voicefleet)

### 5. Cresta

Enterprise contact-centre platform with autonomous voice and digital AI agents plus real-time human agent assist.

**Where it improves on Aissist.io:**
- [Done-for-you service: partial — You buy a subscription, yet Cresta will also build and run the agents for you: builds can be fully managed by its team, with forward-deployed engineers and Implementation Services priced separately on an Order Form.](https://cresta.com/ai-agent-build)
- [API access: yes — Cresta states it provides SDKs and APIs for its conversation services, but the reference documentation is gated behind login or a demo request, so endpoints, limits and terms cannot be checked publicly.](https://developers.cresta.com/)
- [Seat model: partial — Agent count is one of the quoted pricing inputs and the vendor's stated fit starts around 50 to 100-plus care agents, which works as a practical floor, but no per-seat rate or contractual seat minimum is published.](https://cresta.com/llm-info)

**Trade-offs against Aissist.io:**
- [Claude: partial — Anthropic is named as a sub-processor supplying natural-language APIs, which is the closest Cresta comes to confirming Claude in its stack; buyers are never offered a named model to select.](https://trust.cresta.com/)
- [GPT: partial — OpenAI and Microsoft are named sub-processors supplying natural-language APIs; model choice per task is not published.](https://trust.cresta.com/?itemUid=e3fae2ca-94a9-416b-b577-5c90e382df57)
- [How it meters: partial — Cresta names its pricing dimensions - products, agent count, conversation volume, channels and languages - but publishes no rate, no unit price and no overage figure, so cost is quoted per deployment.](https://cresta.com/llm-info)

[View Cresta](https://theagentsindex.com/cresta)

### 6. Sierra

Enterprise platform for customer-service AI agents across voice, chat, email and messaging, priced by outcome.

**Where it improves on Aissist.io:**
- [Done-for-you service: partial — You license software and get Sierra's own agent-development team alongside it, so delivery is a partnership rather than pure self-serve tooling.](https://sierra.ai/product)
- [Agent permissions: yes — Autonomy is configurable per workflow: you set goals and guardrails and name the steps that require human sign-off before the agent proceeds.](https://sierra.ai/product/horizon)
- [API access: yes — A headless API is one of the published deployment surfaces; the reference is behind the docs sign-in, so endpoints, auth and limits are not public.](https://sierra.ai/blog/agent-data-platform)

**Trade-offs against Aissist.io:**
- [Multi-agent: partial — Two vendor agents hand work to each other — Explorer's findings go straight to Ghostwriter — but customer-built agents coordinating on one task is not documented publicly.](https://sierra.ai/product/explorer)
- [Claude: partial — Anthropic is a named AI-services subprocessor, so Claude is in the mix, but Sierra routes models itself and never exposes a Claude selector.](https://trust.sierra.ai/subprocessors)
- [GPT: partial — OpenAI is listed as an AI-services subprocessor, so GPT models are used under the hood, chosen by Sierra's router rather than by the buyer.](https://trust.sierra.ai/subprocessors)

[View Sierra](https://theagentsindex.com/sierra)

### 7. AiZipZap

Customer intake agent that turns each request into a job brief, missing questions and a reply draft.

**Where it improves on Aissist.io:**
- [Done-for-you service: partial — The product itself is self-serve software, but the parent company separately proposes a scoped two-week business pilot at $750 for one workflow, with consulting never required.](https://aizipzap.com/pricing)
- [Getting out: partial — Reviewed results export as TXT and Markdown and the account can be deleted, but hosted requests are retained only 30 days and unused handoffs expire each billing period.](https://aizipzap.com/pricing)

**Trade-offs against Aissist.io:**
- [Runs autonomously: partial — Collection, saving, drafting and notification run without a human, but the vendor stops deliberately at the draft: the owner reviews, edits and sends every reply themselves.](https://aizipzap.com/)
- [Multi-agent: no — One drafting pass per request is described throughout; the vendor's concurrency statement describes shared generation capacity, not agents coordinating on a task.](https://aizipzap.com/pricing)
- [Agent permissions: no — The agent has no permissions to spend: the vendor lists inbox access, reply sending, code execution and business-system access as things it cannot do at all.](https://aizipzap.com/terms)

[View AiZipZap](https://theagentsindex.com/aizipzap)

### 8. Ada

Agentic customer experience platform running AI support agents across voice, messaging and email.

**Where it improves on Aissist.io:**
- [Done-for-you service: partial — Software you run yourself, but Ada sells a wrapped services layer: ACX Experts give hands-on guidance and ACX Practice supplies blueprints and training, so part of the operating model is delivered by Ada's people.](https://www.ada.cx/platform/)
- [API access: yes — A documented REST API suite covers knowledge, end users, conversations and data export, with rotatable keys, versioning, cursor pagination, a downloadable OpenAPI spec and an in-docs playground.](https://docs.ada.cx/reference/introduction/overview)
- [Bring your own key: partial — You bring your own system credentials, not your own inference: MCP and API tools run on company credentials or end-user sign-in you supply, while nothing documents bringing your own model keys or cloud.](https://docs.ada.cx/docs/automation/tools/mcp-tools)

**Trade-offs against Aissist.io:**
- [Multi-agent: partial — One agent per conversation, with several models orchestrated behind a single Reasoning Engine; the vendor describes multi-LLM orchestration and human handoff, not several agents coordinating on one task.](https://www.ada.cx/)
- [Free tier: no — There is no self-serve entry at all: the pricing route resolves to the demo form and the only documented way in is a booked expert session leading to an enterprise agreement.](https://www.ada.cx/demo/)

[View Ada](https://theagentsindex.com/ada)

### 9. Crescendo

AI-native CX platform: agents resolving support across voice, chat, email and SMS, with a staffed team behind them.

**Where it improves on Aissist.io:**
- [Done-for-you service: yes — This is software plus people: Crescendo deploys its own team to calibrate the platform, and its PartnerHero affiliates in seven countries supply human support agents and QA.](https://www.crescendo.ai/)
- [Agent permissions: yes — A named Safe Action Framework splits autonomous actions from ones needing human approval, and published integration tools carry typed inputs, permissions and review before the agent may call them.](https://www.crescendo.ai/)
- [Getting out: yes — Reports and insights export to CSV, Excel, image or PDF in-product, and on termination the customer instructs deletion or return of all personal data; no credits exist to expire.](https://www.crescendo.ai/policies/data-processing-agreement)

**Trade-offs against Aissist.io:**
- [Claude: no — Anthropic appears nowhere on the site, and the binding sub-processor list that authorises every third party touching customer data names OpenAI, Google Gemini/Vertex, Groq, Azure and Amazon Nova Sonic only.](https://www.crescendo.ai/subprocessors)
- [How it meters: partial — Billing is per resolution — $1.25 for AI-handled, $2.25 for the AI-plus-human model — but the fixed monthly fee charged alongside it is never quantified, so only half the unit is public.](https://www.crescendo.ai/blog/how-much-do-chatbots-cost)
- [Free tier: no — No $0 plan, self-serve signup or trial is published; the single route in is a booked demo, and the only free items are onboarding and the guarantee credits.](https://www.crescendo.ai/contact)

[View Crescendo](https://theagentsindex.com/crescendo)