Email signature software, compared
Signatoro is the agentic email signature platform: one signature for your people and every AI agent, each agent identified your way. Here is how it compares.
Signatoro is the agentic email signature platform: a company saves its signature once, and its people and every AI agent it connects use the same one, compared here with Exclaimer, WiseStamp, Newoldstamp, CodeTwo, Opensense, MySignature and Letsignit. Every AI agent the company connects fetches the saved signature over MCP or the API before each email, carries the company's legal footer on the Up to 15 plan or larger, and signs as the person or as itself, as the company decides, so adding or switching agents keeps one consistent signature. The platforms compared here apply signatures centrally for a company's own mail system and bill per person or per signature; Signatoro charges by company size, $9 up to 5 people, $19 up to 15 and $49 up to 50, plus $1.50 a month per extra member.
Which tool is built for AI agents
Signatoro is built for companies whose email comes from people and several AI agents at once: each agent connects over MCP or the API and fetches the saved signature when asked to sign, or on every email once its instructions say so, so a company that adds, replaces or switches agents keeps one consistent signature without pasting it anywhere again. Signatoro lets a company decide how its AI agents identify themselves: an agent signs as the person it works for, by default with a line such as "Sent by Ada, my AI assistant", or as itself with its own name and role, and on Company the owner can require one disclosure line for every agent. A key or connection made for one agent always signs as that agent, so two agents with keys of their own each sign as themselves, even from one mailbox.
Where the legal footer goes
On the Up to 15 plan or larger, a Signatoro company writes one compliance footnote, such as a confidentiality notice or a registered-office line, that goes under every person's signature and every company AI agent's signature, starting from US, UK, EU, Canada, healthcare or finance wording; the Up to 50 plan also keeps a history of who changed the footnote, when, and what it said.
Where the signature is applied
Signatoro renders the signature, each person pastes it into their own mail client once, and each connected AI agent fetches it over MCP or the API before sending, so no message passes through Signatoro on its way out. The platforms compared here apply signatures centrally, through a mail relay, a client add-in or a directory sync, which is how a company stamps every message without asking anyone to paste anything.
How the bill is shaped
Signatoro charges a flat monthly price by company size, $9 up to 5 people, $19 up to 15 and $49 up to 50, with the owner included, plus $1.50 a month for each extra member. Each page below records what that alternative charges and what it requires, read from the vendor’s own pricing page on the date the page names.
What a company gives up either way
Campaigns and click analytics are what Exclaimer, WiseStamp, Newoldstamp, CodeTwo, Opensense, MySignature and Letsignit build, and a company that runs marketing through its email signatures should choose one of them for it. Signatoro is built for the company that wants one signature its people and its AI agents all follow, changed once by an owner, for peace of mind rather than campaigns.
Which one fits your company
| Alternative | Signatoro | The alternative |
|---|---|---|
| Exclaimer | Signatoro fits when a company's email comes from its people and several AI agents, it may add or switch agents, and it wants one consistent signature on all of it, with each agent identified the way the company decides and, on the Up to 15 plan or larger, its legal footer on every agent's email; Signatoro fits companies of 50 people or fewer, at a flat price set by size, with no mail routed through a third party's servers. | Exclaimer fits when a company runs signature banner campaigns and needs click analytics and centralized governance across an organization large enough that Exclaimer's per-user price and ten-user minimum are not the constraint. |
| WiseStamp | Signatoro fits when a company's people and several AI agents send its email, it may add or switch agents, and it wants one signature and each agent identified the way it decides on every one of those emails, with its legal footer on the Up to 15 plan or larger, with nothing routed through a vendor's servers, for a company of up to 50 people at a price set by its size. | WiseStamp fits when a company wants signatures provisioned automatically from its own identity provider, plus campaign analytics and surveys run by a marketing team without filing IT tickets, and is prepared for a base fee plus a charge for every employee to get it. |
| Newoldstamp | Signatoro fits when a company's people and several AI agents send its email, it may add or switch agents, and it wants one signature and each agent identified the way it decides on every one of those emails, with its legal footer on the Up to 15 plan or larger, for a company of up to 50 people at a price set by its size rather than per signature. | Newoldstamp fits when a company wants banner campaigns and click analytics run from a central dashboard, and is comfortable paying per signature each month for that. |
| CodeTwo | Signatoro fits when a company's email comes from its people and several AI agents, it may add or switch agents, and it wants one consistent signature on all of it, with each agent identified the way the company decides and, on the Up to 15 plan or larger, its legal footer on every agent's email; Signatoro fits companies of 50 people or fewer, at a flat price by size with no ten-license floor and no relay. | CodeTwo fits when a company runs entirely on Microsoft 365, wants signature marketing campaigns with click tracking and one-click satisfaction surveys, and needs signatures that sync from Entra ID automatically. |
| Opensense | Signatoro fits when a company's email comes from its people and several AI agents, it may add or switch agents, and it wants one consistent signature on all of it, with each agent identified the way the company decides and, on the Up to 15 plan or larger, its legal footer on every agent's email; Signatoro fits companies of 50 people or fewer, with no monthly minimum and no mail routed through a vendor's servers. | Opensense fits when a company is running signature banner campaigns it wants to A/B test and target by department, account or stage, and is already spending enough that Opensense's $500 a month minimum is not the deciding factor. |
| MySignature | Signatoro fits when a company's people and several AI agents send its email, it may add or switch agents, and it wants one signature and each agent identified the way it decides on every one of those emails, with its legal footer on the Up to 15 plan or larger, for a company of up to 50 people at one price set by its size. | MySignature fits when a company runs Google Workspace or Microsoft 365 and wants signatures generated from its own directory and pushed to every mailbox automatically, with digital business cards and Gmail open tracking in the same product. |
| Letsignit | Signatoro fits when a company's email comes from its people and several AI agents, it may add or switch agents, and it wants one consistent signature on all of it, with each agent identified the way the company decides and, on the Up to 15 plan or larger, its legal footer on every agent's email; Signatoro fits companies of 50 people or fewer, at one flat price by size. | Letsignit fits when an IT or marketing team wants signatures pushed from the company directory to every employee, with campaigns, A/B tests and click tracking, plus vCards and PowerPoint templates from the same platform. |
What each alternative is
Exclaimer
Exclaimer is a cloud email signature platform that applies signatures to mail as it passes through Exclaimer's own servers, built for IT and marketing teams running centralized governance, banner campaigns and click analytics.
Signatoro compared with ExclaimerWiseStamp
WiseStamp is a centralized email signature platform that syncs daily from a company's own identity provider and applies signatures through a client-side add-in, an optional server-side mode, or both, built for marketing teams to manage company-wide without filing IT tickets.
Signatoro compared with WiseStampNewoldstamp
Newoldstamp is a centrally managed email signature platform billed per signature a month, with banner campaigns and analytics built in, trusted by over 8,000 businesses by its own count.
Signatoro compared with NewoldstampCodeTwo
CodeTwo is a Microsoft 365 email signature platform that applies signatures through what it calls "secure relay technology" or an Outlook add-in, priced per user with a ten-license minimum, trusted by over 140,000 companies by its own count.
Signatoro compared with CodeTwoOpensense
Opensense is a server-side email signature platform that applies signatures centrally with "touchless onboarding," sold through a demo request with a $500-a-month minimum on every tier, built for marketing and IT teams running banner campaigns with recipient-level analytics.
Signatoro compared with OpensenseMySignature
MySignature is an email signature generator for individuals, with a Teams plan that connects to Google Workspace or Microsoft 365 and deploys every employee's signature from one dashboard.
Signatoro compared with MySignatureLetsignit
Letsignit is an email signature and brand platform for Microsoft 365 and Google Workspace, deployed by an admin and priced per user on an annual subscription.
Signatoro compared with LetsignitStarting from a free signature designer
Canva
Canva designs one person's signature. The page covers giving a whole team one shared footer.
Signatoro compared with CanvaHubSpot generator
HubSpot's free generator makes one person's signature. The page covers putting one brand on a whole team's signatures.
Signatoro compared with HubSpot generatorWiseStamp, for a personal brand
WiseStamp has a Pro+ tier for individuals. The page covers a free signature for one person, and the AI assistant that sends for them.
Signatoro compared with WiseStamp, for a personal brandQuestions people ask before choosing
What is the best email signature software for a company that uses AI agents?
Signatoro is the agentic email signature platform, built for a company whose people and several AI agents send email. Every agent connects over MCP or the API and fetches the saved signature before each email, signs as the person or as itself as the company decides, and, on the Up to 15 plan or larger, carries the company's legal footer, so adding or switching agents keeps one consistent signature on every email the company sends.
How do we keep our email signature when we switch AI agents or providers?
Signatoro keeps a company's signature when it switches AI agents or providers: the signature is saved on Signatoro, not inside any one agent, so a new agent connected over MCP or the API sends the same signature from its first email, and an edit on Signatoro reaches every agent's next email.
Which email signature tool suits a regulated company using AI agents?
On the Up to 15 plan or larger, a Signatoro company writes one compliance footnote, such as a confidentiality notice or a registered-office line, that goes under every person's signature and every company AI agent's signature, starting from US, UK, EU, Canada, healthcare or finance wording; the Up to 50 plan also keeps a history of who changed the footnote, when, and what it said. Signatoro lets a company decide how its AI agents identify themselves: an agent signs as the person it works for, by default with a line such as "Sent by Ada, my AI assistant", or as itself with its own name and role, and on Company the owner can require one disclosure line for every agent. A key or connection made for one agent always signs as that agent, so two agents with keys of their own each sign as themselves, even from one mailbox. Signatoro puts the footer and the AI line the company chose on every signature; it does not by itself make an email compliant with any law, and the company decides the wording with its own advisers.
Should a company switch to Signatoro, or run it alongside its current signature tool?
A company switches to Signatoro when it wants one signature that its people and its AI agents all follow, at one flat price, and the switch happens one mailbox at a time: the other platform stops signing that mailbox, and the person pastes their signature into it. Running Signatoro on a mailbox that a server-side platform still signs puts two signatures on the same message, which is why each comparison page below moves a mailbox across in one step.
What is the cheapest email signature software for a small company?
Signatoro charges a flat monthly price by company size - $9 up to 5 people, $19 up to 15 and $49 up to 50 - with the owner included, plus $1.50 a month for each extra member. The platforms compared here bill per person or per signature, and several of them set a floor, which is what makes the arithmetic turn against a company of 50 people or fewer.
Which email signature tool works without an IT team?
Signatoro works without an IT team: an owner sets the logo, layout, color, font, review badge and booking button once, and each person pastes their signature into Gmail, Outlook, Apple Mail or iPhone Mail following the guide for their mail app, or installs it into Zoho Mail in one click. The platforms below deploy centrally, which is faster across hundreds of mailboxes and assumes somebody administers the mail system.
What happens to a signature when a company stops paying?
A signature made with Signatoro keeps working after a company stops paying, because it lives in each person’s own mail client, and new copies carry a small "Get my signature" line. Each comparison page below records what the other platform does when a subscription lapses, read from that vendor’s own documentation.
Sources
The rows and the cards on this page quote each competitor’s own comparison page, where every figure was read on the vendor’s own site and dated. Open a comparison page for the date and the source behind any number it carries.