One formula. Fair at every size.
Flat-price brackets by Exchange Online license count: $5 a month for up to 50, $10 up to 100, $20 up to 200, $50 up to 500, and $100 up to 1,000. No per-seat math, no feature tiers, no surprises — monthly or annual, your choice.
Starter
Small teams getting on-brand
$55
/year
Billed once a year.
Business
Established organizations
$220
/year
Billed once a year.
Enterprise
The biggest deployments
$1,100
/year
Billed once a year.
Volume
1,000+ mailboxes
Custom
Volume terms, invoicing, and a dedicated rollout path.
Every tier includes every feature — nothing is locked behind a higher plan. You pay only for how many mailboxes you cover.
How much for your team?
Slide to your Exchange Online license count — we'll find your bracket.
Exchange Online licenses
Anyone with a license that includes Exchange Online counts.
Your price bracket
1–50
$5/mo
51–100
$10/mo
101–200
$20/mo
201–500
$50/mo
501–1,000
$100/mo
1,000+
Volume
75 licenses lands in the Team bracket — one flat price, no per-seat math.
Your Team plan
Team tier$110
/year
One annual payment at your current license count — every feature included.
- All features — no locked tiers
- Compose + reply signatures for all 75 users
- Unlimited admins, templates, and revisions
- Setup in ~10 minutes with a manifest link
You pay for mailboxes, not magic
OneSignature lives inside Outlook, so the only thing that matters is how many people actually have a mailbox. No per-user fees, no per-signature fees, no add-on costs for group signatures or admin seats — just a clean count of Exchange Online licenses.
Only Exchange Online counts
Business Standard, E3, E5, Exchange Online Plan 1 or 2 — if a license includes a mailbox, it counts. Everything else doesn't.
A flat price per bracket
Your count lands in a bracket — 55 licenses and 98 licenses both cost the flat $10/month. No per-seat math, ever.
Adjusts at renewal
Grow from 90 to 120 licenses mid-year? Your price simply moves to the next bracket at the next renewal.
A few real-world examples
Boutique firm
42 licenses · 1–50 bracket
$5/mo
$55/yr on annual
Growing company
87 licenses · 51–100 bracket
$10/mo
$110/yr on annual
Mid-size enterprise
175 licenses · 101–200 bracket
$20/mo
$220/yr on annual
Large workforce
480 licenses · 201–500 bracket
$50/mo
$550/yr on annual
Big enterprise
750 licenses · 501–1,000 bracket
$100/mo
$1100/yr on annual
Examples for illustration — your exact price comes from the calculator above.
Every plan. Everything included.
We don't believe in holding features hostage. Pay for scale, get the whole product.
Unlimited everything
Unlimited admins, templates, revisions, and signature edits. No seat-based feature gates — every plan is the full product.
Always-current signatures
Profile data flows straight from Microsoft 365, so titles, phone numbers, and photos stay in sync without anyone thinking about it.
Central branding
Locked, on-brand templates with a full WYSIWYG editor and 30+ starter designs. Users can customize if you let them — or not.
Group-aware by design
Different signatures for different teams — matched against your existing Microsoft 365 groups, including nested memberships.
Privacy by default
Your users' profile data stays in their own mailboxes. The one optional server-assisted feature is off unless you turn it on.
Every Outlook, one signature
Windows, Mac, Outlook on the web, iOS, and Android — deployed once by your admin with a single manifest link.
The details, plainly
Everything we get asked about billing — answered without fine print.
Which licenses count toward my total?＋
Any user whose Microsoft 365 license includes Exchange Online: Microsoft 365 Business Basic, Standard, and Premium; Enterprise E1, E3, and E5; and Exchange Online Plan 1 or 2. Users with a mailbox get a signature, so they're the ones that count. Standalone products without a mailbox (like a Visio or Project-only license) don't count.
How do the price brackets work?＋
Your Exchange Online license count falls into a flat-price bracket: 1–50 is $5/month, 51–100 is $10/month, 101–200 is $20/month, 201–500 is $50/month, and 501–1,000 is $100/month. Whether you have 55 users or 98, you pay the same $10 — no per-seat math. Above 1,000 licenses we move to volume pricing.
How does annual billing work?＋
One yearly payment at your annual rate — a 50-license organization pays $55/year, and a 200-license organization pays $220/year. At each renewal we re-count your Exchange Online licenses and bill the current bracket for the year ahead.
What happens if we grow mid-year?＋
At each renewal we re-count your Exchange Online licenses and apply the bracket your count falls into. Growth within your current bracket doesn't change your price at all — going from 40 to 49 licenses still costs the same.
Is there anything extra to install on user devices?＋
No. Your admin deploys OneSignature once from the Microsoft 365 admin center using a manifest link — about ten minutes — and every user gets the add-in automatically across all their Outlook apps. Updates flow through the same link.
Do you store user data on your servers?＋
Not by default. Signatures and profile data live in each user's own Microsoft 365 mailbox. There is one optional feature — an on-behalf-of profile refresh — that administrators can enable if they want fully automatic updates, and it's off unless you explicitly turn it on.
Can we cancel or change plans?＋
Yes — billing is per month or per year with no lock-in, and since every tier includes every feature, you never need to “upgrade” for access. Your price simply follows your bracket at renewal.
Still have a question?
Make every send on-brand.
Sign in with your Microsoft 365 admin account to get started. Setup takes about ten minutes — no user devices to touch.
Priced by Exchange Online license count — from $5/month for up to 50 mailboxes.