FinderAtlas
Sign in

Assistly vs Sierra

Features, pricing, ratings, and pros and cons, side by side.

Sierra logo

Sierra

Enterprise AI agents that handle customer conversations across voice, chat and messaging, priced by outcome

Paid
Visit websiteView details

Verdict

Assistly is listed under Live Chat Tools and Sierra under AI Customer Support. Only Assistly has a free plan or trial. Only Assistly offers an API.

Best overall

Assistly

  • Small service businesses
  • Online stores
  • SaaS teams
  • Agencies managing client websites

Choose Assistly if

  • You want a tool built for answering common visitor questions after hours.
  • Permanent free plan with 50 chats a month and no card required.
  • Setup is one line of code, with guides for the main website builders.

Choose Sierra if

  • You want a tool built for large companies automating high-volume customer conversations across voice and digital channels with outcome-based pricing.
  • Outcome-based pricing ties cost to results rather than seats or tokens.
  • Covers voice, chat, SMS, WhatsApp, email and ChatGPT from one agent build.
Best value
Assistly
Best for beginners
Assistly
Best for business
Sierra

Features

20 features compared.

  • Answers from your own content
    Assistly
    Available
    Sierra
    Not available
  • Multilingual replies
    Assistly
    Available
    Sierra
    Not available
  • Lead capture and alerts
    Assistly
    Available
    Sierra
    Not available
  • Human takeover
    Assistly
    Available
    Sierra
    Not available
  • Shared inbox
    Assistly
    Available
    Sierra
    Not available
  • WhatsApp answering
    Assistly
    Available
    Sierra
    Not available
  • Booking in chat
    Assistly
    Available
    Sierra
    Not available
  • One-line install
    Assistly
    Available
    Sierra
    Not available
  • Signed in users and AI actions
    Assistly
    Available
    Sierra
    Not available
  • REST API
    Assistly
    Available
    Sierra
    Not available
  • Agent Studio
    Assistly
    Not available
    Sierra
    Available
  • Ghostwriter
    Assistly
    Not available
    Sierra
    Available
  • Voice agents
    Assistly
    Not available
    Sierra
    Available
  • Multi-channel deployment
    Assistly
    Not available
    Sierra
    Available
  • Horizon
    Assistly
    Not available
    Sierra
    Available
  • Context Engine
    Assistly
    Not available
    Sierra
    Available
  • Insights and Explorer
    Assistly
    Not available
    Sierra
    Available
  • Experiments
    Assistly
    Not available
    Sierra
    Available
  • Knowledge management
    Assistly
    Not available
    Sierra
    Available
  • Trust and reliability
    Assistly
    Not available
    Sierra
    Available

Pricing

Plans as listed by each vendor. Check their sites for current prices.

  • Pricing model
    Assistly
    Freemium
    Sierra
    Paid
  • Free plan
    Assistly
    Yes
    Sierra
    No
  • Starting price
    Assistly
    $0
    Sierra
    Custom
  • Plans
    Assistly
    5 plans
    Sierra
    1 plan

Assistly plans

  • Free

    $0

    Free to start, no card needed

    • 50 chats a month
    • Reads up to 25 pages of your website and help docs
    • 1 integration (website chat)
    • 3 knowledge files
    • Powered by Assistly badge

  • Basic

    $29.99/month

    Your own chat with no badge

    • 500 chats a month
    • Reads up to 50 pages
    • 2 integrations
    • 10 knowledge files
    • WhatsApp answering
    • No Assistly badge

  • Starter

    $79/month

    For a one location business

    • No monthly chat limit
    • Reads up to 100 pages
    • 3 integrations
    • 25 knowledge files
    • Hot lead scoring
    • After hours mode
    • Lead export to Excel
    • You plus 2 team members

  • Pro

    Most popular

    $149/month

    For businesses that live on leads

    • Reads up to 300 pages
    • Unlimited integrations
    • Unlimited knowledge files
    • Verified signed in users
    • AI actions on your own system
    • Insights dashboard

  • Premium

    $299/month

    For busy teams and multiple sites

    • Reads up to 1,000 pages
    • Up to 5 websites
    • Full white label
    • REST API
    • Unlimited team members
    • Priority support

Sierra plans

  • Enterprise

    Most popular

    Custom/custom

    Outcome-based pricing quoted through Sierra sales

    • Agent Studio
    • Ghostwriter
    • Insights
    • Multiple channels
    • Context Engine

Our ratings

Scored out of 10 by the Finder Atlas editorial team. Last reviewed October 2026.

Assistly
7.7overall
Sierra
7.6overall

  • Answer Quality & Knowledge Training

    Assistly
    7.5
    Sierra
    Not rated

  • Lead Capture & Inbox

    Assistly
    8.0
    Sierra
    Not rated

  • Ease of Setup

    Assistly
    8.5
    Sierra
    Not rated

  • Integrations & Channels

    Assistly
    7.0
    Sierra
    Not rated

  • Pricing Clarity

    Assistly
    7.5
    Sierra
    Not rated

  • Ease of Use

    Assistly
    Not rated
    Sierra
    7.5

  • Feature Depth

    Assistly
    Not rated
    Sierra
    8.5

  • Value for Money

    Assistly
    Not rated
    Sierra
    7.0

  • Performance & Speed

    Assistly
    Not rated
    Sierra
    8.0

  • Documentation & Support

    Assistly
    Not rated
    Sierra
    7.0

Scores weigh documented features, plan value, platform coverage, integrations and user feedback. A missing score means we have not rated that area yet.

Pros and cons

Assistly

Pros

  • Permanent free plan with 50 chats a month and no card required.
  • Setup is one line of code, with guides for the main website builders.
  • Answers in the visitor's language and trains on pages and uploaded files.
  • Human takeover, lead status tracking and email or phone alerts are on every plan.
  • Plain trust page covering hosting, encryption, two step sign in and data deletion.

Cons

  • Very new product (domain registered April 2026), with no public customer count or independent reviews found.
  • Paid billing is not open yet, so paid plan prices may still change.
  • Web only: no native mobile app or browser extension.
  • WhatsApp on the Free plan and each extra integration beyond the plan limit cost $19.99 a month; extra team members cost $19 a month.
  • Replies depend on OpenAI models, so chat content is sent to a third party.

Sierra

Pros

  • Outcome-based pricing ties cost to results rather than seats or tokens.
  • Covers voice, chat, SMS, WhatsApp, email and ChatGPT from one agent build.
  • Ghostwriter can create agents from existing SOPs, transcripts or audio interviews.
  • Large enterprise customer base named on the homepage, including Uber, Vanguard and Hyatt.
  • Broad compliance list, including SOC 2, ISO 42001, HIPAA and FedRAMP.
  • Built-in analytics, monitors and experiments for tuning agent behavior.

Cons

  • No published pricing and no self-serve signup or free trial found.
  • Aimed at enterprises; small businesses are not the evident target.
  • Outcome-based billing can make monthly cost harder to forecast.
  • Public documentation for developers (API or SDK) was not found on the official site.

Platforms

  • Web
    Assistly
    Supported
    Sierra
    Supported
  • Windows
    Assistly
    Not supported
    Sierra
    Not supported
  • macOS
    Assistly
    Not supported
    Sierra
    Not supported
  • iOS
    Assistly
    Not supported
    Sierra
    Not supported
  • Android
    Assistly
    Not supported
    Sierra
    Not supported
  • API
    Assistly
    Supported
    Sierra
    Not supported
  • Browser Extension
    Assistly
    Not supported
    Sierra
    Not supported

Integrations

Assistly

8 integrations
  • WordPress
  • Wix
  • Squarespace
  • Shopify
  • Webflow
  • GoDaddy
  • WhatsApp
  • OpenAI

Sierra

9 integrations
  • Snowflake
  • Databricks
  • Redis
  • AWS
  • Google Cloud
  • Slack
  • Microsoft Teams
  • WhatsApp
  • ChatGPT

Company

  • Company
    Assistly
    Assistly
    Sierra
    Sierra Technologies, Inc.
  • Founded
    Assistly
    2026
    Sierra
    2023
  • Headquarters
    Assistly
    Not listed
    Sierra
    San Francisco, USA
  • Listing
    Assistly
    Claimed
    Sierra
    Claimed

Frequently asked questions

Is Assistly better than Sierra?

It depends on your workflow. Assistly is built for answering common visitor questions after hours. Sierra is built for large companies automating high-volume customer conversations across voice and digital channels with outcome-based pricing.

What are the key feature differences between Assistly and Sierra?

Assistly: AI chat assistant that answers website visitors and captures leads around the clock. Sierra: Enterprise AI agents that handle customer conversations across voice, chat and messaging, priced by outcome.

Does Assistly or Sierra have a free plan?

Assistly has a free plan or trial; Sierra is paid only.

Which is cheaper, Assistly or Sierra?

Assistly starts at $0 and Sierra starts at Custom. See the pricing table above for what each tier includes.