one.com Companion Reviews: Is It Legit?

Customer Experience

Positive experience8.8% of reviews
Neutral11.8% of reviews
Negative experience79.4% of reviews

~ Based on 34 written reviews from the US App Store.

Is one.com Companion Safe?

one.com Companion appears safe based on user ratings. AppsHunter Safety Score for one.com Companion is 87/100.

This assessment is based on 103 user ratings, with an App Store average of 4.5/5.

Safety Analysis

89.9% of ratings point to a safe experience
0.0% of ratings suggest some concerns
10.1% of ratings point to a risky experience

~ Based on 99 App Store ratings for one.com Companion.

Is one.com Companion Legit?

one.com Companion appears to be a legitimate app. AppsHunter Legitimacy Score for one.com Companion is 83/100.

Based on 83 of 100 points across 7 verification signals from App Store and developer data.

Top reviews

Bugs bugs bugs

The login sucks, and the newsletter doesn’t work. Not much support

Troep

Slechtste mailing app ooit… je moet om de haverklap weer aanmelden

Schlecht

Das ist die einfachste und gleichzeitig schlechteste Mail‑App, die ich je benutzt habe. Minimalismus ist schön, aber hier wirkt es eher wie ein unfertiger Prototyp.

Response from developer

Vielen Dank für Ihr Feedback. Es tut uns leid, dass die App Ihre Erwartungen nicht erfüllt. Wir nehmen Ihre Rückmeldung ernst und arbeiten kontinuierlich daran, die App weiter zu verbessern. Viele Grüße Mathias / one.com

Complicated

One.com is one of the worst companies I have dealt with as far as customer service goes and the ease of doing business. The sooner I've moved my business and closed the account the better!

Response from developer

Good morning,  I am very sorry to hear about your experience with our customer service.  That is not the service we intend to deliver to our customers.  Sadly, I can't find a subscription in our system based on your name. Would you be willing to send us a mail to service@one.com with your domain name and the issues you experienced?  We will gladly look further into your situation so we can help you.  Kind regards,  Meya / one.com

Waardeloos

Loopt continu vast, ligt niet meer in met de vaste inloggegevens, herkent mailadres niet als mailadres etc etc

Completely pointless

Had the companion app on my phone to access business emails on the go. Easy to set up but you have to keep resetting the app two or three times a day as it refuses to recognise the PIN code (literally just after setting it up on some occasions), plus it stops recognising fingerprint unlocking. Got so frustrated by constantly resetting, I’ve just deleted it. Pointless.
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Response from developer

Good afternoon,  Thank you for your feedback.  I am sorry to hear you experienced issues that lead to deleting the app all together.   That is not the experience we wish to offer our customers. If you wish to use the app again, you are welcome to send a mail to service@one.com with the details of your device, app version and the exact issues you encounter.  For now, I wish you a good day ahead!  Kind regards,  Meya / one.com

PIN code needs constant reset

Good enough apart from the PIN which needs a constant reset. It is not enough to make me move from One but very frustrating

Response from developer

Hi, Thank you so much for your feedback. I am really sorry to hear that. It should obviously not be necessary to reset your PIN all the time and I clearly understand the frustration. I am passing your experience on to our team so we can look into what is causing the trouble. Thank you for choosing to stay with us despite the inconvenience. Best regards, Michael, One.com

Schlechteste Verknüpfung von Sicherheit und Nutzerfreundlichkeit, Preisleistung viel zu teuer, unpra

Die Flunktionalität ist äußerst unpraktisch und ohne Komfort. Sperrige Menuefunktionen und Sicherheitseinstellungen. Keine Empfehlung.

Response from developer

Es tut uns sehr leid zu hören, dass Sie mit der Kombination aus Sicherheit und Nutzerfreundlichkeit sowie dem Preis‑Leistungs‑Verhältnis unzufrieden sind. Wir möchten Ihnen gern weiterhelfen und gemeinsam herausfinden, wie wir Ihre Erfahrung verbessern können. Sie erreichen uns unter service@one.com . Wir freuen uns auf Ihre Nachricht!

Zweitklassig

Kann man sich aktuell sparen, Mails werden nur sehr Zeitversetzt geladen.

Response from developer

Vielen Dank für Ihr Feedback. Es tut uns leid zu hören, dass Ihre E-Mails aktuell nur mit Verzögerung geladen werden. Das entspricht selbstverständlich nicht unserem Anspruch. Unser Team arbeitet bereits an einer Lösung, damit alles wieder reibungslos funktioniert. Vielen Dank für Ihre Geduld!

Really awful and clunky

It’s 2026 and I can’t believe apps are still this terrible. You can even scroll down when drafting an email. Whoever developed this app needs to be fired asap. It’s terrible!!!!!

Response from developer

Good morning,  Thank you for sharing your review of the Companion App.  I am sorry to hear about about the difficulties you’ve experienced.   To help us look into this further, could you please send an email to service@one.com with a brief description of the issues you’re encountering, along with your domain name and the type of phone you’re using? Once we have these details, we’ll be more than happy to investigate this for you. For now I wish you a good day ahead.  Kind regards,  Meya / one.com

No support if MFA stops working

Don’t use the app as a 2 factor authentication, because at one point it will lose your info and you cant login without it. This is vendor locking as no 2nd option is offered!!

Fehlerhafter Badge am App-Icon

Leider bekomme ich seit längerem ständig ein Badge mit dem Inhalt „1“ am App-Icon angezeigt. Es liegt innerhalb der App aber keine Info vor. Auch das Löschen und Neuinstallieren der App hat keinen Erfolg gebracht.

Response from developer

Guten Tag,  Vielen Dank für dein Feedback und den Hinweis! Wir bedauern, dass es zu diesen Schwierigkeiten gekommen ist. Bitte melde dich kurz unter support@de.one.com, damit wir uns das gemeinsam genauer ansehen und das Problem schnell lösen können. Beste Grüsse,  Sven / one.com

So disappointing

No notifications, cumbersome access to emails, emails not sending despite sending them, no auto-recognition of used email addresses, no access to address book.

Response from developer

Hi there, Thank you for taking the time to share your thoughts with us. We truly value your feedback and completely understand how disappointing it can be to experience issues like missing sound, badges, or notifications, especially when you’re just getting started. Our goal is to provide a seamless and reliable experience, and input like yours helps us identify areas where we can improve. We encourage you to double-check that notifications for the one.com app are enabled under your iPhone’s Settings - Notifications — but if everything looks correct and the issue continues, our support team would be happy to look into it further. Regarding your suggestion for dark mode — we agree this would be a great feature! Your feedback has been shared with our product team so it can be considered for future updates. We appreciate your patience and the chance to improve your experience with one.com.

Waste of time!

Sadly, after 20minuets on web chat the provider informs me there’s nothing we can do! I have put all web logins that work fine on my Mac in, reset password, deleted the app, reinstalled and, rebooted phone and my laptop and still I can’t even log in with my password on the app, pointless!

Response from developer

Good afternoon, Thank you for your review and feedback. For further assistance, please contact us at service@one.com.  We will assist you further and, if necessary, refer you to the appropriate department for a solution.  Thank you in advance and have a good day!

Slow

The two factor takes way way way too long

Can’t login in

Sliders, neither buttons are responding to touch. Device is Ok. App is most recent version.

3/5

Ok, but could be better. Too many log in requests. Sometimes every day!

Not working

Can't log in

Ständige Abbrüche und Fehler beim Login

Der letzte Dreck. So eine miese Authentfizierung hatte ich noch nie. Ständige Abbrüche nachdem man sich authentisiert hat. Authentifizierung schlägt fehl und sendet keine Rückmeldung. Ich dachte immer SAML wäre das Schlimmste was es gibt.

Completely useless as 2 step verification

Takes forever until verification request arrives - if it ever does.