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Sailfish OS Koli is now available

No doubt you’ll already have read about the transition of Sailfish OS into its fourth generation. And that, of course, also means a new Sailfish OS release. We’re very pleased to announce Sailfish OS 4.0.1 Koli, one of our biggest Sailfish releases for a long time. There are far too many improvements to cover all of them in detail here – you can check details from the release notes. In line with our version 4 naming, we’ve chosen to look at four significant improvements below.

But before getting in to that, you’ll of course want to know about Koli. The Koli National Park is in the North Karelia region of Finland in the east, hugging the western shore of Lake Pielinen, which you can see in the update photo. It’s not hard to see why the beautiful vistas provided inspiration for Jean Sibelius, the most famous Finnish composer. The photograph also shows the characteristic white quartzite on the Koli “vaara” (amongst the many words for “hill” in Finnish, “vaara” is the second smallest).

Browser update

In Sailfish OS Pallas-Yllästunturi we brought you an important update to the browser, bringing the rendering engine to Gecko version ESR52. With Sailfish OS 4 Koli we’ve pushed further, bringing it up to version ESR60. This means improved performance and website compatibility, not just within the browser itself but everywhere the Gecko engine is used, including for third-party apps.

From a technical perspective, updating the browser engine to Firefox-based Gecko version ESR60 has been an important milestone because it introduces Rust programming language into the upstream Gecko codebase. Rust was already discussed in the Pallas-Yllästunturi release, but at that point it was experimental. Sailfish OS 4 Koli is the first release where we’re actually taking Rust into use, meaning we can now get future browser updates rolled out more easily.

The browser isn’t just the rendering engine of course, and you’ll also notice improvements in browser features elsewhere too. We’ve beefed-up the privacy controls with site-specific permissions and tightened security when logging in to public wifi hotspots. Bookmark and history management have been extended, and you can now access the improved Settings from directly within the browser. You can also now save out pages to PDF for sharing and later offline reading.

Many of these changes were contributed by and developed in collaboration with our customer OMP, with all of the code being released as Open Source and available in our source code repositories. This is an important example of how our open source strategy benefits all users, customers and the community alike.

Firejail app permissions

There are many reasons to choose Sailfish OS over other mobile operating systems, but at Jolla we never forget that privacy and control are things our customers care deeply about. That’s because we care deeply about them too, and that’s why we’ve introduced Firejail app sandboxing into Sailfish OS 4 Koli.

When you first run an application, the Firejail app sandbox will make clear which permissions an application needs in order to run. A Firejailed app is prevented from accessing any of the functionality not granted on the list. Why is that important? We know Jolla developers are trustworthy, but there’s always the possibility someone will release an app containing rogue code, or with an accidental vulnerability for an attacker to exploit. If this happens, it’s reassuring to know the app is confined to minimise any harm it can do.

Some users may be concerned that this increasing security and privacy may impact the control you have over your own device. Rest assured this is not the case. With developer mode activated you’re still free to execute apps outside the sandbox if you prefer. In contrast to other mobile operating systems we want all Sailfish OS users to have full control of their devices, while ensuring malicious hackers don’t.

In the latest release many of the Jolla apps are sandboxed by default, but we’re not yet applying this to third party apps. Sandboxing prevents the use of boosters and QML pre-compilation, with a performance penalty we’re working to avoid. Restricting its use initially to a selected set of apps will give us the chance to iron out some of these kinks before we activate it for third party apps in a future release.

Android App Support

Since the very first release of Sailfish OS, Android App Support has been an important part of our offering. In Sailfish OS 4 Koli we’re reinforcing our commitment to seamless integration of Android apps with the broadest possible compatibility.

We’re bumping Android App Support up to Android 9 “Pie” on the Xperia XA2 and 10, an improvement that’s required many changes under the hood. For the end user it means even better compatibility with the latest Android apps and support for API level 28. Crucially it also allows better alignment with the underlying drivers, making it more stable and easier to maintain in the future.

Integration with the rest of the operating system has also been improved, and will continue to be as Sailfish 4 develops. Already you’ll notice slicker integration with settings, notifications and the keyboard, and multiple bug fixes to make Android apps work even better on Sailfish OS.

A slicker, clearer, UX

The Sailfish 3 era saw improvements to the apps and user experience across multiple areas, including call experience, Events view, messages and more. With the jump to version 4 we’re not reinventing the UI, but are continuing this trend of making significant improvements to functionality and usability.

We’ve made careful but impactful changes to the UI to increase legibility, all without undermining the beautiful Sailfish OS aesthetic. We’ve improved how notifications work, allowing the most common tasks – such as replying to an email – to be triggered directly from the notification. Images can now be embedded in notifications, and housekeeping has been given an overhaul with increased use of gestures for dismissing notifications either individually or in groups. The new functionality is available to third party developers, allowing deeper integration between apps and the operating system.

Contact management is another area where we’ve made big strides forwards. You’ll already be aware of the useful UI changes in previous releases and now we’ve introduced the concept of separate address books for contact storage. This allows, for example, a clear separation between work and personal contacts; especially useful in a business context. Not only does this help with organisation, it also offers greater control over contact syncing between different accounts.

QR code scanning has been integrated directly into the camera app. Just turn it on in the camera settings and any code in view will be automatically identified. Amongst the many other features and bugfixes, you’ll now see warnings about the use of premium rate numbers, slicker VPN configuration and improved calendar management. Community member Damien Caliste deserves a special mention for the astonishing number and quality of calendar improvements he’s contributed.

We’re proud of the fact that during development of Sailfish OS 4 Koli we fixed more bugs than in any of the version 3 releases preceding it. We’re also proud of the amazing contributions from OMP and the Sailfish OS community, be it in the form of code, translations, bug reports ideas and support generally, that allow us to sail forwards even faster.

As we said at the start, Sailfish OS 4 Koli represents an important milestone for us, but it’s as much about the future as it is about the present. The fourth generation of Sailfish OS will see more improvements to the acclaimed Sailfish OS user interface, better compatibility with websites and Android apps, improved, slicker functionality throughout, and an improved developer offering. We’re looking forward to sharing the journey with our partners, customers and community.

David Llewellyn-Jones

Software engineer at Jolla. Fanatical about privacy, maths, open source and the environment. Occasionally craves adventure and a good thunderstorm.


  1. Avatar

    Hi! And thanks for the in-depth details of the release!
    (And even between releases, don’t hesitate to make other such “reports from the trenches” about the work going on SFOS.
    I am sure there’s still going to be a long series of interlocked/lock-step work to do on compilers, libraries, etc.)

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    Great Job, with Jolla since 2013 with Jolla 1 and a beautiful teeshirt.

    Now 3 devices at home : Sony XA2, Sony Xa2 Plus, Sony Xperia 10 with last version

    keep it up

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    With the newest update, users still cannot bluetooth mp3s. Like on Sailfish III, VPNs still don’t work on my device…or perhaps I don’t know how to configure them. Would it be possible for Jolla to accept payments in Bitcoin? PayPal wants to know everything about its user and I like anonymity. I ask because my Travelex Money Card no longer works in my region all thanks to the COVID 19 scamdemic/lockdown.

    • Avatar

      I read the same comment on the other blog before. Please contact support or use the forum.

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    Are we getting group SMS and MMS with this update?

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    Thank you for the insight into the new release.
    My Sailfish phone is my daily driver since autumn 2017.
    For stupid things I also have a Lineage device and I have an Iphone for work. Although there a some rough edges sometimes I clearly like my SF device best.

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    I would say bad news for jolla 1 user like me. 🙁

  7. Avatar

    Great update! Every Update since is a small party!

  8. Avatar

    No reason to Party for the tablet backers so far !

    Still no word even after 6!! years Jolla has not been able to close this chapter of their history.

    So yes Jolla has come a long way, and has still a long way to go before they can continue as a trustworthy company.

    Fairy tales and lies is what they sell so far.
    Make amends Jolla ! Pay your tablet backers the promised full refund !

    Then it is time to party!

    • Avatar

      go to LinkedIn and in every post they do call them out, as to what they are LIERS

      that’s what I did and got full refund

  9. Avatar

    Im glad to see that jolla is pushing hard, sorry to hear that original jolla phone will not be supported anymore but it had to come to this eventually. I have 2 jollaphone but I use xperia x with sfos as my daily driver and it bugs me that there is no android support update for x and I know there will be none in the future. At some point I will have to buy a new device and its hard to say at this point how long will be supported current device line, and what other devices will be available. SFOS doesnt exist without device so its not irrelevant. Nonetheless I cheer every time I receive update notification. Good Luck Jolla and Sail On !

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    Well I’m sad, because I can’t use my Jolla the 1st one anymore. I tried with Sony Xperia, but it’s not the same than it was with Jolla. I would be so glad, if you would enable to produce a Jolla phone with Sailfish 4 already installed in it, because then I could use the best mobile phone ever…

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    My Xperia XA2 works fine with Koli. Thank you!It’s a grown up system now. Only one negative point: answering a call is still confusing. A hit and miss. What about the idea to give us the option for the ‘old’ pulley gesture too?

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    Not a single word about Jolla tablet refunds. #HoldingMyBreath

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    Its always funny to read in every blog post 1-2 posts about tablet refunds: Guys: everybody got the second half of the refund. If you don’t got it yet – than your email is wrong or anything else. contact customer support and whine there, but not here. Its funny but slowly such posts sucks….

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      maybe you were refunded without any delay, but waiting 6 years to get your money back isn’t something to fool around

      if you don’t like someone’s comment just skip it

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    To all that haven’t received in full their money back from the tablet, just go in LinkedIn and every time you see a post by Jolla reply to them and call them out as to what they are.

    Pure lairs. It’s bad publicity for them and they don’t want it.

    That’s what I did and they refunded me in full including the extra money I had paid for the large SD card

  15. Avatar

    Hi there,
    maybe this is the wrong blog.

    But can you give us any indication, when Jolla will be customized for Xperia 10iii, thus the first phone with 5G ?

    Looking forward to it…

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