Aux0 vs Nylas
Nylas is the established product here and covers far more mail providers than we do. We publish a price where they quote, we let you bring your own OAuth client from day one, and we put the sync state, the quota budgets and the delivery history on a screen your support team can open.
- What it isAux0A unified API for email, calendar and contactsNylasA unified API for email, calendar and contacts
- Email coverageAux0Gmail, Outlook, iCloud, Fastmail, Zoho and anything speaking IMAPNylas250+ providers with per-provider handling
- CalendarAux0Google, Outlook and any CalDAV serverNylasShipped, and a core product with Scheduler alongside
- ContactsAux0Google, Outlook and any CardDAV server, including auto-collected addressesNylasGoogle and Microsoft
- Your own OAuth clientAux0A project setting on every plan, demoed in the docsNylasSupported, with more setup
- Sync and quota visibilityAux0Backfill progress, quota windows and account health on a screen, filterable by URLNylasAvailable through the API, less so as an operator surface
Claims about Nylas checked November 2026
The short answer
VerdictNylas has been the unified email and calendar API for years, and for a team that wants the broadest provider coverage with the longest track record it is a reasonable choice over us. This page exists because the two products get compared, so here is ours row by row, with the places they beat us marked as clearly as the places we beat them.
Feature by feature
CoverageWhat each of us can do
A filled mark means it works today. Where they lead, the mark is theirs.
Gmail and Outlook over OAuth
- Aux0
- Yes
- Nylas
- Yes
IMAP and SMTP
- Aux0
- Yes
- Nylas
- Yes
Calendar read and write
- Aux0
- Yes
- Nylas
- Yes
Contacts and autocomplete
- Aux0
- Yes
- Nylas
- Yes
Breadth of mail providers
They cover 250-plus. We cover Gmail, Outlook, iCloud, Fastmail, Zoho and anything with IMAP.
- Aux0
- Partial
- Nylas
- Yes
Bring your own OAuth client
A first-class setting for us from day one, on every plan.
- Aux0
- Yes
- Nylas
- Partial
Sync state visible per account
Where a backfill is, what is left of a quota window, when it resets.
- Aux0
- Yes
- Nylas
- No
Webhook replay from the dashboard
- Aux0
- Yes
- Nylas
- Partial
Published price above the free tier
- Aux0
- Yes
- Nylas
- No
Scheduler and notetaker products
They ship both alongside the API. We do not.
- Aux0
- No
- Nylas
- Yes
SOC 2 Type II
- Aux0
- No
- Nylas
- Yes
| Aux0 | Nylas | |
|---|---|---|
| Gmail and Outlook over OAuth | Yes | Yes |
| IMAP and SMTP | Yes | Yes |
| Calendar read and write | Yes | Yes |
| Contacts and autocomplete | Yes | Yes |
| Breadth of mail providersThey cover 250-plus. We cover Gmail, Outlook, iCloud, Fastmail, Zoho and anything with IMAP. | Partial | Yes |
| Bring your own OAuth clientA first-class setting for us from day one, on every plan. | Yes | Partial |
| Sync state visible per accountWhere a backfill is, what is left of a quota window, when it resets. | Yes | No |
| Webhook replay from the dashboard | Yes | Partial |
| Published price above the free tier | Yes | No |
| Scheduler and notetaker productsThey ship both alongside the API. We do not. | No | Yes |
| SOC 2 Type II | No | Yes |
Row by row
3 of 9 rows to Aux0What it is
evenAux0
A unified API for email, calendar and contacts
Nylas
A unified API for email, calendar and contacts
The same product category. The differences are coverage, price and what you can see.
Email coverage
themAux0
Gmail, Outlook, iCloud, Fastmail, Zoho and anything speaking IMAP
Nylas
250+ providers with per-provider handling
If your customers are on regional mail providers, their coverage is better than ours.
Calendar
themAux0
Google, Outlook and any CalDAV server
Nylas
Shipped, and a core product with Scheduler alongside
Contacts
evenAux0
Google, Outlook and any CardDAV server, including auto-collected addresses
Nylas
Google and Microsoft
Your own OAuth client
Aux0Aux0
A project setting on every plan, demoed in the docs
Nylas
Supported, with more setup
Your brand on the consent screen is the difference between your product and a vendor's.
Sync and quota visibility
Aux0Aux0
Backfill progress, quota windows and account health on a screen, filterable by URL
Nylas
Available through the API, less so as an operator surface
This matters the day support asks why one customer's mail is stale.
Pricing model
Aux0Aux0
Per connected account, published to 50
Nylas
Usage-based across calls, accounts and tier
Ours is easier to forecast; theirs can be cheaper at low volume.
Maturity
themAux0
Launching
Nylas
Long-established with enterprise customers
Compliance
themAux0
SOC 2 in progress, not yet certified
Nylas
SOC 2 Type II
If your buyer needs the report today, theirs exists and ours does not.
Which to pick
DecisionPick Aux0 if
- You want a price you can forecast without booking a call
- You want your own brand on the consent screen without a migration
- Your support team needs to see sync state and quota budgets, not file a ticket
- You want iCloud, Fastmail and the DAV protocols as first-class, not an afterthought
Pick Nylas if
- Your customers are on the long tail of regional mail providers
- Scheduling or meeting notes are part of what you are buying
- Your procurement needs a SOC 2 Type II report today
- You want the vendor with the longest production track record
Not sure which side you are on? Tell us your case and we will say which of us fits it.
Where Nylas is ahead
Their caseProvider breadth and real maturity
250-plus mail providers with per-provider handling, years in production, and enterprise customers who have already put them through the review you are about to run. If coverage of the long tail is the requirement, they are the safer buy and we would say so on a call.
Scheduler and Notetaker
Nylas ships scheduling and meeting-notes products alongside the API. If you want those rather than building them, that is a real reason to pick them, and we have no answer to it.
SOC 2 Type II today
Theirs is certified and ours is in progress. A Type II report is a third-party attestation with an observation period, so this is not something we can close by wanting to. If your procurement needs it now, that settles it.
Questions
FAQIs Aux0 a Nylas alternative?
For email, calendar and contacts, yes — the same object model over the same kind of providers. Nylas supports more mail providers than we do; we publish our pricing, support bringing your own OAuth client on every plan, and put the sync and quota state on a screen rather than only in the API.
Do I need my own Google OAuth client to use Aux0?
No. You can start on our verified Google and Microsoft clients and ship today. When you want your own brand on the consent screen, you supply your own credentials and it is a configuration change rather than a migration.
What does Aux0 not do that Nylas does?
Scheduling and meeting notes as products, the long tail of regional mail providers, and a SOC 2 Type II report. All three are real and we would rather you heard them here than found out later.