[Compare](https://defrostmail.com/compare) # Defrost or AiSDR? Facts checked November 9, 2026 AiSDR is AI SDR software that contacts people by email, LinkedIn, voice notes and call steps, and its pay-as-you-go price is $1.50 for each person contacted. Defrost is a done-for-you email service for founder-led B2B service firms in the United States, and its only fee is $300 when a new company replies wanting to talk. AiSDR suits someone who wants more than email and will run the software or pay for its managed service; Defrost suits a founder with no sales team who wants to approve every email. | | AiSDR | Defrost | | What it is | Software that contacts possible customers for you. AiSDR says it puts the quality of the people contacted ahead of volume. | A done-for-you service for founder-led B2B service firms in the United States | | What you pay for | Each person contacted | A new company that replies wanting to talk | | Published price | $1.50 per person contacted, charged daily; stop any time. Team plans by volume, on quarterly contracts. Add-ons: warmed-up mailbox $33, managed service $149 per campaign, fully managed service $2,500 a month. | $300, once per company, plus any tax. No subscription or setup fee. A monthly limit you set, starting at ten companies. | | How it reaches people | Email through Gmail or Outlook, LinkedIn requests and messages, voice notes and video, and call steps | Email only, a few at a time, in working hours, with follow-ups | | Who does the work | You run the software, or AiSDR’s team does on a managed service | We do. Your part is a few minutes, a few days a week. | | Who sees a message before it goes | Replies can be set to wait for your approval. On the per-campaign managed service you approve before anything sends. Whether each first message needs approval by default is not stated. | You. Every email waits for your approval. | | If nobody replies | You have paid for each person contacted | You pay nothing | AiSDR’s details are from its own pricing page and home page, read on November 9, 2026, and are linked under Sources. ## How do the two prices differ? AiSDR charges for each person it contacts, whatever happens next. Defrost charges when a company replies wanting to talk, and nothing for the emails that go unanswered. So with AiSDR, what a conversation costs depends on how many people answer, and with Defrost a reply that counts is $300 each time. AiSDR’s pricing page gives a directional benchmark of 1 to 3 meetings for every 100 people contacted, and says it is not a guarantee. A reply is not a sale either: winning the client is up to you. There is more in our guides to [what counts as a qualified reply](https://defrostmail.com/blog/what-counts-as-a-qualified-reply) and [how lead generation is priced](https://defrostmail.com/blog/how-lead-generation-is-priced). ## When is AiSDR the better choice? - You want to reach people by more than email. AiSDR adds LinkedIn, voice notes and call steps, and Defrost does none of those. - You want to start small. You can sign up without a card, pay $1.50 for each person contacted, and stop any time. - You’ll run it yourself, or you have a sales team that will. AiSDR’s team plans are for teams contacting 1,000 or more people a month. ## When is Defrost the better choice? - You’re a founder with no sales team and no time to run software. We find the companies, write the emails in your name, send them and follow up. - You want to approve every email before it goes, every time. - You’d rather pay when a company replies wanting to talk than for each person contacted. [The fee is $300, once per company](https://defrostmail.com/pricing). ## Questions people ask ### How much does AiSDR cost? On pay as you go, $1.50 for each person contacted, charged daily, and you can stop any time. Team plans are priced by volume and billed monthly on quarterly contracts. Add-ons include a managed service at $149 per campaign and a fully managed service at $2,500 a month. These are from AiSDR’s pricing page, read on November 9, 2026. ### Does AiSDR send messages without my approval? It depends on how you set it up. Replies can be set so you approve them first. On the per-campaign managed service, you review and approve before anything sends. AiSDR’s team reviews the audience and sample messages before launch. Whether each first message needs your approval by default is not stated. ## Sources - [AiSDR pricing](https://aisdr.com/pricing/), read November 9, 2026. - [AiSDR home page](https://aisdr.com/), read November 9, 2026. - [Defrost pricing](https://defrostmail.com/pricing). ## Not sure which fits? Tell us what you do. It takes about three minutes and no card. If you’re a fit, we’ll tell you where we’d start. [Apply to Defrost](https://defrostmail.com/apply)