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Comparison

Wren vs. CodeTwo — an honest comparison.

CodeTwo is one of the best server-side signature products for Microsoft 365. If you have IT, a few hundred mailboxes, and a policy that every outbound message must carry a compliance-approved signature — CodeTwo is a serious pick and this page won't try to talk you out of it. Wren is built for the other 80% of teams: 5 to 100 people, no dedicated IT, and no desire to route their mail through a third party just to get a banner under it.

Numbers reflect published pricing as of early 2026. CodeTwo's per-mailbox pricing tiers change frequently — check their site for the current numbers.

Wren
CodeTwo
How signatures are delivered
Client-side install once per teammate. The signature HTML lives in the mail client; the banner image swaps centrally via a hosted URL. Nothing intercepts your mail.
Server-side injection through Microsoft 365 or Google Workspace connectors — mail is routed through CodeTwo's service and the signature is stamped on send.
Mail routing
Untouched. Wren never sees a sent email.
Outbound mail is routed via a connector to CodeTwo's Azure infrastructure, then relayed to the recipient. This is core to how server-side signatures work.
Pricing model
Flat $99/mo up to 50 people, $199/mo up to 100. No per-seat.
Per-mailbox annual subscription; total scales with mailbox count. Volume discounts on larger tiers.
Free tier
Free forever for 1 person, 1 active banner, full studio.
14-day free trial for evaluation; no permanent free plan.
Setup effort
No admin console. Owner adds teammates; each opens a link and clicks Copy. Live for the whole team in an hour.
IT-led: install the connector in Microsoft 365 or Google Workspace, verify DNS records so mail routes correctly, map Azure AD / Entra attributes into templates, test rules against pilot users. Typically a multi-day project.
Signature on mobile-sent mail
Renders whatever the teammate installed locally. On mobile Outlook / Gmail iOS this means the teammate needs to install once on the phone too (30 seconds).
Because injection happens server-side, mobile-sent mail gets the correct signature automatically. This is CodeTwo's biggest genuine advantage.
Banner campaigns
Built-in. One image swap propagates to every teammate's next email — no re-install.
Full campaign module with scheduling, department targeting, and A/B testing on the enterprise tier.
Best for
5–100 person teams that don't want mail routed through a vendor, don't have IT capacity for a connector project, and want a flat price.
Mid-market and enterprise on Microsoft 365 where guaranteed server-side stamping (including mobile) and directory-driven rules are worth the connector setup and per-mailbox cost.
Choose Wren if
  • • You don't want your outbound mail routed through a third-party service.
  • • You don't have IT capacity for a multi-day connector rollout.
  • • The banner under the signature matters more to you than server-side enforcement.
  • • Flat pricing beats per-mailbox billing at your team's size.
Choose CodeTwo if
  • • You're an enterprise on Microsoft 365 with compliance requirements.
  • • Signatures on mobile-sent mail must be guaranteed without user action.
  • • You need directory-driven rules keyed to Azure AD / Entra attributes.
  • • Server-side legal disclaimers and per-department variants are non-negotiable.

Why teams switch to Wren.

The connector was too much project

Mail routing changes, DNS updates, pilot rings — for a 30-person startup that just wants a nice signature and a banner, it's a mismatch.

Per-mailbox pricing added up faster than expected

Especially with contractors and shared inboxes. Flat pricing is easier to explain to finance.

Owners want to change the banner without opening a ticket

In Wren the owner clicks one image; in server-side tools someone has to touch the central template and republish.

Nobody wanted mail routed through a vendor

Security-conscious teams often reject the routing model on principle — Wren's client-side install sidesteps that conversation entirely.

See what Wren looks like in your inbox.

Design a signature in the free studio, copy the HTML, paste it into Outlook or Gmail. No signup, no card, no connector.

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