SendPulse is a marketing suite where chatbots and website live chat sit next to email, with AI models you can plug in. Darwin is a single-purpose website chat that books meetings and keeps improving its openings. Here's how they compare.
DarwinAI website chat focused on answering buying questions, booking meetings, and improving chat openings.Best for
Less suited to
Messenger marketing across WhatsApp, Instagram and Telegram.
Best for
Less suited to
A chat that tests and improves its own openings.
| Side by side | Darwin | SSendPulse |
|---|---|---|
| Self-improvementHow each product improves the openings that start sales conversations. | ||
| Self-improves to book more meetings | Yes Creates tests. Promotes qualifying winners. Tests again. 1 With automation enabled, on eligible pages within your plan. Tests need enough traffic; a lift is not guaranteed. | Manual A/B tests Operator-built flows with manual A/B splits; an autonomous opening loop is not documented. 234 The Randomizer element sends set percentages of users down each branch; the operator compares branch statistics. |
| Writes new openings for each page | Yes Creates opening variants from page context. 1 For pages with automation enabled and sufficient traffic to run an experiment. Every plan includes unlimited optimized pages. | Manual setup Opening messages are written by the operator, or by an AI Agent step from the operator's prompt, and targeted by triggers. 256 Triggers include website pixel events such as a page URL, for subscribers SendPulse can identify; per-page variants are set up by the operator. |
| Tests and keeps better openings | Yes Tests opening variants and can promote a better performer. 1 Requires enough evidence; an experiment may have no winner. | Manual selection Randomizer branch statistics let the operator judge an A/B test; automatic promotion is not documented. 24 The operator compares element progress and button clicks per branch and edits the flow. |
| Starts the next test automatically | Yes The next opening experiment builds from the current winner. 1 Automation must be enabled and the page eligible. This does not guarantee improving results. | Not documented An automatic cycle of generating, testing and replacing openings is not documented. 24 Changes are made and published by the operator. |
| OnboardingWhat the product prepares for you before you go live. | ||
| Learns from your website | Yes Darwin discovers the relevant pages on your website and prepares its knowledge base from them. 7 Initial setup selects key pages for speed; more pages can be imported later. | Prompt + files AI answers from your instructions and files; website crawling is not described. 38 Web search can be enabled as an option. |
| Drafts your sales settings | Yes Prepares business information and assistant settings from the website. 7 The user can review and refine the generated draft. | Not documented Automatic drafting of business settings from the website is not documented. 39 Prompts are written by the operator; on Pro, AI can generate a flow from that prompt, not from the website. |
| Matches chat to your brand | Colors & fonts Extracts brand colors, fonts and assets for the chat design. 7 Brand detection is a draft: available fonts, contrast and source-site access affect the result. | Not documented Colors are chosen manually; automatic brand import is not documented. 10 A color scheme is selected in widget settings. |
| Writes your first chat opening | Yes Drafts the first chat opening from the business context. 11 Drafted during assisted setup; approve it, edit it (120-character limit) or ask Darwin for a revision. | Manual setup A default Welcome message flow is provided and edited by the operator. 1012 Flows are edited in the builder. |
| Review before going live | Yes The assistant draft can be reviewed and refined before installation. 11 Calendar connection, testing and website installation remain separate completion steps. | Yes Flows can be saved and sent to yourself to test before launch. 23613 Save and send to yourself delivers the flow in the messaging app; some templates also show a preview. |
| PricingUSD before tax. Darwin charges per booked meeting or qualified request. SendPulse has a free tier and prices Pro by subscriber count. | ||
| Lowest monthly platform fee | $0/mo Free has no monthly subscription fee. 14 No card needed to start; credits are charged after the first five free ones. A credit is one booked meeting or qualified request. | $0/mo The Free plan has no monthly fee. 15 3 chatbots, 500 subscribers, 10,000 messages a month; no card required. |
| Introductory offer | 5 free credits The first five credits are free, once. 14 A credit is one booked meeting or one request that passes your fit rules. Not a monthly allowance; a card is needed once all five are used. | Free plan A free plan rather than a timed trial. 15 No separate trial is listed. |
| AI usage charge | $30/credit Free charges $30 per credit after the first five. 14 A confirmed booking or a request that passes the fit rules is one credit. Conversations and leads that fail the fit rules are never charged, and there is no plan fee. | Paid plan required AI model integrations require a paid plan; per-message AI charges are not shown on the chatbot pricing page. 3815 Model usage depends on the connected provider. |
| Paid plans start at | $299/mo Growth is $299 per month on monthly billing. 14 Includes 10 credits a month. Annual billing is two months free ($2,990 a year); credits and extra-credit charges stay monthly. | By subscribers Pro starts at $12 per month on monthly billing for 500 subscribers; the price rises with subscriber count. 15 $9.60 a month billed annually; 120,000 subscribers is $507 a month, or $4,867.20 a year billed annually. |
| Included on paid plans | 10–25 credits/mo Growth includes 10 credits a month; Agency includes 25, pooled across up to 200 client workspaces. 14 Unused included credits roll over for one month. Growth can also be bought with 35, 60 or 110 credits a month, and Agency with 50, 75, 125, 275 or 525. | Unlimited on Pro Pro includes unlimited chatbots, messages and live chats. 15 Limited by subscriber count, not bookings. |
| Additional paid-plan usage | $8–$25/credit Extra credits cost $25 each. Choosing more credits each month lowers the rate: on Growth, $20 at 35 credits, $16 at 60 and $12 at 110; on Agency, $10 at 275 and $8 at 525. 14 Charged automatically each month at the current rate, after the monthly included credits and in addition to the plan fee. | Paid plan required AI model integrations require a paid plan; per-message AI charges are not shown on the chatbot pricing page. 3815 Model usage depends on the connected provider. |
Your first five meetings or requests are free. After that each is $30, or Growth is $299 a month with 10 included.
Facts checked Oct 5, 2026 to Oct 20, 2026. Plans and integrations can change. Not documented means the reviewed sources don’t establish a capability; it doesn’t prove the feature is missing. Sources and method
Eighty-five seconds on what Darwin does: learns your business from your site, books the meeting inside the chat, and keeps rewriting the opening until more people talk.
There's a free tier with three chatbots, 500 subscribers and 10,000 messages a month, no card required, with SendPulse branding on the widget. Pro removes the branding, lifts the limits and is priced by how many subscribers you have. Darwin has no monthly fee on Free and charges per booked meeting or qualified request.
101521It offers appointment flow templates that collect booking details, and its help center shows how to check availability and create Google Calendar events through Make, so the calendar connection is yours to build. Darwin offers a time in the conversation and completes the booking in whichever scheduler you've connected.
213161920Sort of. On a paid plan you can connect OpenAI, Claude, DeepSeek or Gemini to a bot, write it instructions with your company details and FAQs, attach files, and switch on web search if you want. The quality depends on the prompt you write. Darwin's assistant answers from your website and whatever knowledge you add, and you don't have to write a prompt to get it going.
3822Only by hand. A Randomizer element sends set shares of users down different branches, and you compare the branch statistics and pick the winner yourself. SendPulse's own advice is also to watch conversations and fix prompts by hand. Darwin does that watching for you: it drafts opening variants per page, tests them against each other, keeps the winner and queues up the next test.
1234Published by Darwin, using the official documentation linked below. This is a comparison of documented capabilities, not a hands-on benchmark. “Not documented” means the reviewed sources do not establish that capability; it does not prove absence. SendPulse prices its chatbots by subscriber count and connects AI models on paid plans; a subscriber or message is not a booked meeting. Darwin bills for booked meetings. Setup means preparing a draft, not automatically installing it.
Source access and fact-check dates are recorded separately for each source below.
Darwin · Accessed
Rechecked 2026-10-05.
Explains automatic launch, automatic promotion and the next test starting from a winning opening.
Fact checked · Review dueCreates opening variants from page context.
Fact checked · Review dueTests opening variants and can promote a better performer.
Fact checked · Review dueThe next opening experiment builds from the current winner.
Fact checked · Review dueDocuments the website opening optimization loop.
Fact checked · Review dueSendPulse · Accessed
Drag-and-drop flows, triggers, templates including appointment booking, OpenAI integration, statistics for sessions, messages, click-throughs and conversions.
Flows are built from 10+ elements, triggers and templates; this page does not mention A/B testing.
Fact checked · Review dueThe Welcome message and other flows are built by the operator from elements and templates, launched by triggers.
Fact checked · Review dueNo winner selection is described on this page.
Fact checked · Review dueMessages are edited and re-activated manually.
Fact checked · Review dueThis overview does not describe a test step.
Fact checked · Review dueTemplates help users book an appointment, send a request, or sign up.
Fact checked · Review dueSendPulse · Accessed
Bot settings → Integrations; operator-written instructions; optional web search, files and n8n data; paid plan required; monitor conversations to correct prompts.
SendPulse recommends monitoring conversations to correct prompts manually.
Fact checked · Review dueInstructions, files and optional web search feed the AI model.
Fact checked · Review dueUsers write their own bot instructions (example prompts with company info).
Fact checked · Review dueRecommends monitoring conversations to correct prompts.
Fact checked · Review dueAvailable with a paid pricing plan and above.
Fact checked · Review due'Available with a paid pricing plan and above'; bots use operator instructions, can enable web search, add files or use n8n; OpenAI, DeepSeek, Claude and Gemini models can be connected.
Fact checked · Review dueSendPulse · Accessed
Proposed additional source: the Randomizer element sends users down branches at set percentages 'for A/B testing', and branch statistics help assess results.
Fact checked · Review dueProposed additional source: Bot structure shows each branch's progress and button clicks to help the operator assess A/B results; no automatic promotion is described.
Fact checked · Review dueProposed additional source: tests are set up and read by the operator; nothing generates or replaces branches automatically.
Fact checked · Review dueSendPulse · Accessed
Proposed additional source: flows can run on website pixel events such as visiting a page URL, but only for chatbot subscribers SendPulse can identify.
Fact checked · Review dueSendPulse · Accessed
Proposed additional source: with 'The AI bot writes first' the AI Agent element can send the welcome message, generated from the operator's instructions.
Fact checked · Review dueProposed additional source: a 'Test your flow' section says to click Save and send to yourself to see the flow in action.
Fact checked · Review dueDarwin · Accessed
Rechecked 2026-10-05. URL updated 2026-10-19: the docs page moved (the old address redirects here).
Discovers relevant website pages and prepares the knowledge base.
Fact checked · Review duePrepares business information and assistant settings from the website.
Fact checked · Review dueExtracts brand colors, fonts and assets for the chat design.
Fact checked · Review dueSendPulse · Accessed
Proposed additional source: web search and file search are model toggles; there is no site-crawl or URL-ingest option.
Fact checked · Review dueProposed additional source: model usage is 'billed at your AI provider's rates'; web and file search are billed, MCP requests are not.
Fact checked · Review dueProposed additional source: the AI Agent model settings offer web search, file search (files stored in your OpenAI account) and MCP server connections, billed at the provider's rates.
Fact checked · Review dueSendPulse · Accessed
Proposed additional source: on Pro, 'Create a flow using AI' builds a flow from the operator's typed prompt; nothing is drafted from the website.
Fact checked · Review dueSendPulse · Accessed
Widget alignment, color scheme, header text, description; default Welcome message flow; AI models can answer free-form questions.
Select a color scheme that suits your brand.
Fact checked · Review dueThe Welcome message flow is available by default.
Fact checked · Review dueLive chat widget with default Welcome, Standard reply and Unsubscribe flows.
Fact checked · Review dueSetup picks left or right alignment, a color scheme, a header title, a description and a privacy-policy link, and links to JavaScript customization.
Fact checked · Review dueDarwin · Accessed
URL updated 2026-10-19: the docs page moved (the old address redirects here).
Darwin prepares the opening from your website and shows it in a card to approve (Looks good), edit (120-character limit) or revise by message; the page no longer says it uses the experiment writer's requirements.
Fact checked · Review dueThe assistant draft can be reviewed and refined before installation.
Fact checked · Review dueSendPulse · Accessed
Proposed additional source: a bot greeting (up to 256 characters) and menu are also typed by the operator in Bot settings.
Fact checked · Review dueSendPulse · Accessed
Booking category templates with appointment flows; no calendar integration described.
'Once you customize your flow, send it yourself to test it, and then save it'; 'Save and send to yourself' sends the flow to the bot owner, and some templates preview the conversation.
Fact checked · Review dueThe Booking category holds appointment flows for various industries; no native calendar connection.
Fact checked · Review dueDarwin · Accessed
Darwin's own pricing page after the move to credits (Free, Growth, Agency): plan fees, credits included, extra-credit prices, add-ons, annual billing and what uses a credit. Read from the live page; the release script checks the page before it records the access time.
Free has no monthly fee; its first 5 credits are free, then each credit is $30.
Fact checked · Review dueThe first 5 credits on Free are free, once; a card is needed after that.
Fact checked · Review dueFree charges $30 a credit after the first five; leads that fail the fit rules are free.
Fact checked · Review dueGrowth is $299 a month, or $2,990 a year, with 10 credits a month included.
Fact checked · Review dueGrowth includes 10 credits a month and Agency 25, pooled; unused credits roll over one month.
Fact checked · Review dueExtra credits are $25 on Growth and Agency; choosing more credits each month lowers them to $20, $16 or $12 at 35, 60 or 110 on Growth, and to $8 at 525 on Agency.
Fact checked · Review dueSendPulse · Accessed
Free plan with 3 chatbots, 500 subscribers and 10,000 messages.
Fact checked · Review dueFree plan; no trial period mentioned.
Fact checked · Review dueChatGPT integration listed under Pro.
Fact checked · Review duePro yearly example: 120,000 subscribers for $507 per year.
Fact checked · Review dueUnlimited chatbots and live chats; unlimited messages per month.
Fact checked · Review dueChatbots and live chats across messengers and website with subscriber-based Pro pricing.
Fact checked · Review dueUnlimited chatbots and live chats on Pro.
Fact checked · Review dueNo SendPulse branding on Pro.
Fact checked · Review dueDarwin · Accessed
Rechecked 2026-10-05.
Describes the visitor-to-meeting flow.
Fact checked · Review dueDocuments public booking links, inline contact collection, embed limitations and confirmation-tracking requirements.
Fact checked · Review dueDarwin · Accessed
Describes the included Darwin product areas.
Fact checked · Review dueDarwin · Accessed
Documents the conversion-focused reporting workflow.
Fact checked · Review dueSendPulse · Accessed
Proposed additional source: a chatbot appointment flow sends a webhook to Make, which creates a Google Calendar event.
Fact checked · Review dueSendPulse · Accessed
Proposed additional source: on a paid plan, a flow checks a requested slot in Google Sheets through Make and books it or suggests another time.
Fact checked · Review dueSendPulse · Accessed
Proposed additional source: JavaScript sets primary color, light/dark/auto theme, position offsets, a custom launcher icon, height (480-720 px), language and an embedded mode; fonts are not listed.
Fact checked · Review dueDarwin · Accessed
Rechecked 2026-10-05.
Documents website importing and management of assistant knowledge sources.
Fact checked · Review due
