Best email signature software for Office 365, priced at 25, 150 and 500 users
Most "best of" lists for this category are written by a vendor who ranks itself first and leaves prices out. This one puts every tool's yearly cost at three company sizes in one table, taken from each vendor's own price list, and says plainly where we lose. Pick your size, then your deployment method, and the shortlist writes itself.
| Group | Mailboxes | Status |
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The short answer
For a Microsoft only company of 10 to 150 users, CodeTwo Email Signatures 365 is the best value server side tool at $0.99 to $1.22 per user a month. If budget is the only test, Sigsync and BulkSignature cost less. Exclaimer is the pick when marketing runs banner campaigns. AutoSignature is the pick when Outlook and Gmail users share one company, when no vendor may route your mail, or when you have 286 to 600 mailboxes and want one flat yearly price.
Our picks by company size
Price per user falls with volume at most vendors and stops being published somewhere between 200 and 500 users. That is why the best tool for a 25 person office is rarely the best one for 500.
Under 50 users
priced at 25-
$216 a year
Cheapest
Sigsync
-
$366 a year
Best value server side
CodeTwo
-
$264 a year
Outlook and Gmail
BulkSignature
50 to 150 users
priced at 150-
$1,146 a year
Cheapest
Sigsync
-
$1,782 a year
Best value server side
CodeTwo
-
$1,788 a year
Outlook and Gmail, no routing
AutoSignature
150 to 600 users
priced at 500-
$4,788 a year
Flat published price
AutoSignature
-
$6,000 a year
ABM in the signature
Opensense
-
$8,700 a year
Banner programs
Exclaimer
Exclaimer is priced on its Standard tier, the cheapest one that allows more than one template. Sigsync includes the 20 percent code its own pricing page applies above 20 users, and its 25 user figure uses its 11 months billed for a year. All prices were read on the vendors' own pages or, for Crossware, on Microsoft's marketplace, between September 20 and October 2, 2026.
Twelve Office 365 signature tools by yearly cost
Sorted by cost at 25 users. "Quoted" means the vendor stops publishing a price below that size, so you will need a sales call to budget it.
| Tool | 25 users | 150 users | 500 users | How it applies the signature | Gmail too |
|---|---|---|---|---|---|
| Sigsync | $216 | $1,146 | Quoted | Connector or Outlook add-in | No |
| BulkSignature | $264 | $1,584 | Quoted | Outlook add-in | Yes |
| CodeTwo | $366 | $1,782 | Quoted | Server side | No |
| Xink | $396 | $1,476 | Quoted | Outlook add-in | Yes |
| Crossware | $420 | $2,520 | $8,400 | Loop through its Azure service | Separate product |
| Exclaimer Standard | $435 | $2,610 | $8,700 | Server side or Outlook add-in | Yes |
| Newoldstamp | $449 | $2,399 | Quoted | Office add-in | Yes |
| AutoSignature | $588 | $1,788 | $4,788 | Written to the mailbox | Yes, same plan |
| Letsignit | $600 | $3,600 | $12,000 | Outlook add-in | Yes |
| Rocketseed | $705, 50 seat floor | $1,843 | Quoted | Server side relay | Yes |
| WiseStamp Platform | $2,568 | $4,068 | $8,268 | Server side on Platform only | Yes |
| Opensense | $6,000 | $6,000 | $6,000 | Transport rule in your tenant or add-in | Yes |
At 25 users we sit in the middle and at 150 we are fifth of twelve. At 500 we are the cheapest published number, because our Scale band is flat up to 600 while per user prices keep adding up. Rocketseed also charges a setup fee it does not publish, and Opensense's figure is its $500 a month platform minimum, which covers up to 500 users on its Signature plan.
What 150 users pay in a year
150 is where most mid-size buyers land and where the spread is widest: the most expensive tool costs five times the cheapest. Five tools sit within about $400 of each other between $1,476 and $1,843, so at this size price alone should not decide it.
The deciding questions are the ones in the next section: how the signature gets into the email, and whether your Gmail users are covered on the same bill.
- Sigsync $1,146
- Xink $1,476
- BulkSignature $1,584
- CodeTwo $1,782
- AutoSignature $1,788
- Rocketseed $1,843
- Newoldstamp $2,399
- Crossware $2,520
- Exclaimer Standard $2,610
- Letsignit $3,600
- WiseStamp Platform $4,068
- Opensense $6,000
Server side, add-in or mailbox, the choice that matters more than price
Every tool in the table does one of three things. Each is a real trade, and your security team and your phone users will care which one you buy.
Server side routing
The vendor stamps it after send
A connector sends each outgoing message to the vendor's cloud, which adds the signature and hands it back to Microsoft. It covers every device, including phones, and users cannot strip it. The cost is a third party in your mail path and a signature the sender does not see while writing. CodeTwo, Exclaimer, Rocketseed, Crossware and Sigsync work this way.
Outlook add-in
The add-in inserts it while writing
Deployed centrally from the Microsoft 365 admin center, the add-in places the signature in the compose window. No routing, and the sender sees it. But it only runs where Outlook add-ins load, so mail from other apps goes out bare. BulkSignature, Xink, Letsignit, Newoldstamp and SyncSignature use this route.
Written to the mailbox
The signature lives on the account
The tool writes the approved, personalized signature into each user's mailbox from directory fields, so Outlook, Outlook on the web, Gmail and phone apps all use it as the person's own. No routing and nothing to install. This is how AutoSignature works, on Office 365 email signature management and on Google Workspace.
The shortlist, one paragraph each
CodeTwo Email Signatures 365
One plan, server side, Microsoft 365 only, with a price that falls from $1.22 per user a month at 25 to $0.76 at 450 and is quoted from 500. Minimum 10 licenses, and shared mailboxes that send count as licenses. Best value for a Microsoft only company that wants signatures on phones. Full numbers in CodeTwo pricing.
Exclaimer
The largest name, with Starter at $0.90 per user limited to one template, Standard at $1.45 and Pro at $1.75, 10 user minimum and annual billing. Covers Gmail too. The strongest choice when marketing owns the signature and wants campaigns and analytics, and among the more expensive ones at 500.
Sigsync and BulkSignature
The two cheapest. Sigsync is Microsoft only, with server, add-in or combined modes and a quote above 200 users. BulkSignature is an add-in with a SOC 2 Type II report and Gmail support at $0.88 per user a month. If price leads and their deployment fits, buy one of these.
Crossware
$1.40 per user a month on Microsoft's marketplace, looping mail through its Azure service, with separate products for Google Workspace, on premises Exchange and HCL Domino. The right call if you still run Domino. Details in the Crossware email signature alternative comparison.
Opensense
Signature plans from $1 per user but a $500 a month platform minimum on every plan, which makes it expensive under 500 users and fair above. Built for account based marketing with CRM targeting in the banner. A sales tool more than an IT tool.
AutoSignature
Three flat bands: $49, $149 or $399 a month billed yearly for up to 25, 150 or 600 mailboxes. Microsoft 365 and Google Workspace at the same depth on every plan, signatures written to the mailbox, locked legal blocks by group and one step rollback from Business. Not the cheapest below 100 users. See plans and limits.
Five questions that settle the shortlist
Answer these before any demo. Each one removes two or three names from the table.
If the signature banner is one piece of a wider automated marketing program, ask how click data leaves the signature tool before you sign. For the compliance side of the footer, the email signature disclaimer software page covers locked legal text by group.
- 01
Do you have Gmail users anywhere?
If yes, drop CodeTwo and Sigsync, and get Crossware's Workspace quote in writing.
- 02
May a vendor route outgoing mail?
If not, drop the server side tools and choose between an add-in and a mailbox written signature.
- 03
Do people send from phones?
Add-ins cover Outlook mobile only. Server side and mailbox written signatures cover more of the phone apps your staff actually use.
- 04
How many users in two years?
Budget at that number. A per user price that wins at 80 can lose at 300, and several vendors switch to a quote past 200.
- 05
Who will run it?
If marketing owns it, weigh banners and analytics. If IT or compliance owns it, weigh locked blocks, roles and rollback.
Office 365 signature software questions
What is the best email signature software for Office 365?
For a Microsoft only company of 10 to 150 users that wants signatures on every device, CodeTwo Email Signatures 365 is the best value at about $0.99 to $1.22 per user a month. Exclaimer is the stronger pick for banner marketing. AutoSignature fits companies that run Outlook and Gmail together or want no mail routing, and is cheapest from 286 to 600 mailboxes.
What is the cheapest email signature software for Office 365?
On published list prices, Sigsync is the cheapest Microsoft 365 tool we track: $216 a year for 25 users and $1,146 for 150 with its standing 20 percent code. BulkSignature at $0.88 per user a month and Xink, which falls to $0.55 per user at 300, come next. All three stop publishing prices somewhere between 200 and 500 users.
Does Microsoft 365 have a built-in email signature manager?
Not a full one. Exchange Online mail flow rules can append an HTML disclaimer to outgoing mail, but the sender never sees it, it lands under the quoted thread and personalization is limited. Roaming signatures sync one person's signature across their Outlook apps, but there is no admin setting to push one signature to every user. The longer version is in our company wide email signature for Office 365 guide.
Is server side or client side email signature software better?
Server side tools route each message through the vendor and stamp the signature after send, so they cover every device but add a third party to your mail flow. Add-in tools insert it while the user writes, inside Outlook only. Tools that write the signature to the mailbox show it everywhere without routing. The right one depends on your security policy and devices.
How much does email signature software cost for 100 users?
Between about $800 and $2,400 a year on published prices. Sigsync is $801, Xink $1,116, CodeTwo $1,332, Rocketseed $1,320 plus setup, Exclaimer Standard $1,740 and AutoSignature $1,788. Opensense is the exception at $6,000 because of its $500 a month platform minimum.
Can I manage Outlook and Gmail signatures from one tool?
Yes, but not with every vendor. CodeTwo and Sigsync cover Microsoft 365 only. Exclaimer, Xink, BulkSignature, Letsignit, Newoldstamp, Rocketseed and AutoSignature cover both, and Crossware sells a separate Google Workspace product. Check whether Gmail is on the same plan and price, since some vendors quote it separately. Our side is on Google Workspace email signature management.
One signature standard for Outlook and Gmail
Team is $99 a month for up to 25 mailboxes, Business is $299 for up to 150 and Scale is $799 for up to 600, with 50 percent off on yearly billing. Microsoft 365 and Google Workspace on every plan, signatures written to the mailbox.
Related: email signature management software, Exclaimer vs CodeTwo pricing and Outlook signature manager.