Comparison
Kerna vs Fyxer AI
Kerna sorts the inbox into the categories your team actually uses, pulls named fields out of the attachment, and drafts the reply for you to check — each one when you ask for it. Fyxer categorises and drafts before you open the inbox. Which you want depends on whether the mail has to be understood before it is answered.
What Kerna brings to the day
- Your own categories, and named fields pulled out of the attachment.
- A free tier rather than a seven-day clock.
- Nothing touches the mailbox until you ask it to.
Every Fyxer figure below was read on fyxer.com and carries the date it was checked. Last reviewed .
Who each is for
Two different jobs
Kerna is for work that has to be understood first
The operational inbox where quotes, spec changes, invoices and complaints arrive from outside the company. The value is in reading what arrived correctly, which is why nothing runs until a person asks for it.
Fyxer is for an inbox that is sorted and drafted before you open it
Categorisation and draft replies are ready before you look, and a notetaker joins Zoom, Teams and Meet on the same subscription. The premise is that the first pass should already be done by the time you get there.
Overlap
What both of them genuinely do
Worth being clear about, because the differences below only mean something once the overlap is named.
- Running in both Gmail and Outlook.
- Sorting inbound mail into categories and drafting replies.
- Summarising a thread you have not read.
- A published commitment that your content is not used to train AI models.
Differences
Where they actually diverge
Whether anything happens without you
Kerna
Nothing. Kerna reads a message only when you press a button, and it does not send mail.
Fyxer AI
Categorisation and draft replies are produced before you open the inbox, which is the product working as designed rather than a side effect. The vendor states Fyxer will never send an email on your behalf.
What reaches the model
Kerna
Personal data is redacted from the message inside Kerna’s own processing, on every request, before any content is transmitted to the inference provider.
Fyxer AI
The security page describes nothing being removed from message content before the model call.
What five seats cost
Kerna
€69 a month for up to five seats on Business, sharing one token pool, with a free tier at €0 so the first run costs nothing.
Fyxer AI
USD 150 a month for five on Starter, or USD 112.50 billed annually — the highest in our comparison. There is no free tier; a seven-day trial is the only way to try it, and Starter covers one inbox.
Assurance and central control
Kerna
CASA Tier 2 Letter of Validation, which is an independent third-party assessment, and Microsoft Publisher Attestation, which is a published self-assessment rather than an audit. No SOC 2, no ISO 27001, no single sign-on and no SCIM, at any tier.
Fyxer AI
SOC 2 Type II and ISO 27001, with the certificates in a Trust Center. Single sign-on and SCIM are Enterprise features, and the published Enterprise minimum is fifty users — above a five-person company.
What comes out of an attachment
Kerna
Structured extraction across PDF, DOC and XLS with 100 field presets — 20 industries by 5 document types — exporting to Excel, Word or CSV in Outlook, and Sheets or Docs in Gmail.
Fyxer AI
Reading email attachments is listed on the Professional tier. What that page describes is the attachment being read, not named fields being lifted out of it into a file you can open.
Cost
What each one actually costs
Read from each vendor’s own pricing page, with the date. If a figure is not verified, it is not stated.
Kerna
- Entry price
- Standard: EUR 12 per month. Pro: EUR 22 per month. Free Starter available.
- Read on the vendor’s own page · checked 2026-08-22
- Five seats
- Business: EUR 69 per month for up to five users sharing 7,500,000 tokens.
- Read on the vendor’s own page · checked 2026-08-22
- Free tier
- Yes. Starter includes all functions within its token allowance.
- Read on the vendor’s own page · checked 2026-08-22
Fyxer AI
- Entry price
- Starter: USD 30/user/month, or USD 270/user/year. Professional: USD 50/user/month, or USD 450/user/year.
- Read on the vendor’s own page · checked 2026-09-05
- Five seats
- Starter: USD 150/month or USD 1,350/year for five. Professional: USD 250/month or USD 2,250/year for five.
- Read on the vendor’s own page · checked 2026-09-05
- Free tier
- No permanent free plan is listed. Standard trials last seven days; Enterprise trial arrangements can be discussed with sales.
- Read on the vendor’s own page · checked 2026-09-05
EUR 69 a month for five seats against USD 150, and a free tier rather than a seven-day trial.
Data handling
Where content goes on each side
The two differ in two specific ways: what is removed before content reaches the model, and whether anything runs before you ask it to.
Kerna
- Processing
- The application runs on Google Cloud Run in Belgium, with Firestore in Poland. Kerna masks detected personal data before model processing and has a zero data retention agreement with OpenAI Ireland Limited. Account and usage data have separate retention rules. The model-processing location must be established from the applicable configuration and terms, not the contracting entity’s address.
- Read on the vendor’s own page · checked 2026-08-22
Fyxer AI
- Processing
- Fyxer publishes SOC 2 Type II and ISO 27001 assurances, states that customer data does not train third-party AI models, and describes least-privilege support access. Its trust centre provides further documents. The reviewed security page does not confirm universal masking before model processing.
- Read on the vendor’s own page · checked 2026-09-05
Kerna’s full position, clause by clause, is on the trust page.
When Kerna is the better fit
- The categories that matter are yours — Quote requested, Spec change, Chasing payment.
- Nothing should touch the mailbox until a person asks it to.
- The mail arrives from outside the company and has to be read correctly before it is answered, not answered quickly.
- Redaction before the model call is something your security review asks about.
- You need named fields out of the PDF, not a summary of it.
Where Fyxer already fits
- You want the inbox handled before you look at it, and you are comfortable with replies drafted before you have read the message. That is the product working as designed.
- You want a notetaker joining Zoom, Teams and Meet on the same subscription. Kerna does email and nothing else.
Try it on one morning’s inbox
The free tier costs nothing and installs in minutes. A single morning of real mail settles this faster than any comparison table.
Deployment
Getting it in front of a team
Time to value
Kerna installs from the Google Workspace Marketplace or AppSource, or an administrator deploys it for the whole organisation. There is a free tier at €0, so getting it in front of someone costs nothing. What each tier includes is on the pricing page.
What it needs
For Outlook: a Microsoft-hosted mailbox. Mailboxes on POP, IMAP or on-premises Exchange are not supported. Gmail has no such restriction.
The gap worth knowing first
What Kerna does not have: configurable company single sign-on (you sign in with your Microsoft or Google account, but there is no SAML or OIDC connection to your own identity provider), SCIM, SOC 2, ISO 27001, and Outlook mobile — though the Gmail add-on does work in the Gmail mobile app. Stated here rather than left to be discovered, because a requirement is easier to check now than after an install.
Other comparisons
Comparing something else
Same method on each: figures read from the vendor’s own pages, dated, and the parts where they win stated plainly.
Still working out what to compare on? Seven questions to ask any vendor.
Try it against one morning’s inbox
Kerna’s Starter tier is €0, includes every feature, and carries a trial token allowance to run them on. Install it, take one morning’s real mail through it, and see whether the categories, the extracted fields and the draft are the ones you would have produced.
Fyxer and Fyxer AI are trademarks of Fyxer AI Limited. Gmail and Google Workspace are trademarks of Google LLC; Outlook and Microsoft 365 are trademarks of the Microsoft group of companies. Kerna is not affiliated with or endorsed by any of them. Comparative statements reflect each vendor’s own published documentation on the date shown.