Space Haven: This one's more a "keep tabs on", with Steam Workshop support for modding just added it's fairly likely there'll be some Workshop exclusive mods in the future.

The Last Gas Station: Missing macOS builds.

Astor: Blade of the Monolith (GOG version is missing an update since September 18, 2024.)

Buccaneers! (Soundtrack only on Steam)

Cyber mission (GOG version is missing a couple updates since November 3, 2025, and "Full armor" DLC since August 24, 2024.)

Heads Will Roll: Reforged (Soundtrack only on Steam. Maybe too soon to list, but Tailor's Chest DLC only on Steam since April 25, 2026.)

Hunter Girls ("additional content" DLC only on EGS & Steam)

Lamentum (Linux build only on Steam)

Mondealy (Soundtrack only on Steam)

Nine Witches: Family Disruption (Japanese translation only on Steam since May 16, 2021.)

Paramnesia (Linux & Mac builds only on Steam)

Project Pastorate (Mac build only on Steam)

She Sees Red (Mac build only on Steam)

Soulless: Ray of Hope (Linux builds only on Humble, Itch, & Steam)

The Mildew Children (Artbook & Soundtrack only on Steam)

We. The Revolution (Steam has 8 more language translations than GOG, since February 7, 2026.)

Looper Tactics Complete Edition (The store page indicates Mac support, but GOGDB indicates there's only a Windows build here, so Mac build only on Steam.)

Mortal Sin (GOG version is missing two updates since March 19, 2026.)

The Hungry Lamb: Traveling in the Late Ming Dynasty (GOG version is missing two updates since August 22, 2025. Both seem to involve translations.)

Achilles: Legends Untold ("3D Print Achilles Model" DLC only on EGS & Steam)

A Tiny Sticker Tale (Linux & Mac builds only on Steam)

Guards II: Chaos in Hell (Soundtrack only on Steam)

Lonesome Village (GOG is missing multiple updates, starting from November 3, 2022; Linux & Mac builds only on Steam)

Machick 2 (GOG is missing multiple updates, starting from February 20, 2026)

Mulaka (Mac build only on Steam)

I can see this DLC at GOG, unless they've made two.
edit: they've made two.

Warhammer: Mark of Chaos - Gold Edition

It's missing the updates that are on the other store which adds and fixes many things. Now the weird thing is that in the other store the game has SNEG as a publisher (which are gog-friendly as far as I know) but here on GOG according to the store page it's games workshop and black hole entertainment.

The names are different now, so that probably means GOG version is not considered the same as SNEG version, which will have to wait to be released here.

EGS and Steam have two 3D model DLCs: "3D Print Achilles Model" and "Mythic Hero 3D Figurine 2.0: Achilles Edition".
GOG has only "Mythic Hero 3D Figurine 2.0: Achilles Edition".
Not something that I personally care about at all, but some folks might.


1954 Alcatraz (GOG seems to be missing Polish subtitles, oddly enough. Can anyone confirm?)

7Days Origins (Soundtrack only on Steam)

8Doors: Arum's Afterlife Adventure (GOG is missing a couple bug fixes, though it's possible the "save data reset bug" may have been exclusive to Steam, I dunno.)


Not an addition to the list, but just something I noticed:
9 Years of Shadows IS up-to-date on GOG. However, there's a typo in the version number here: GOG has it as "1.0.41" instead of "1.1.41", making it look like it got downgraded from 1.0.98 in the changelog.

I apologise for the long absence. I'm catching up with everything I missed in the last weeks, I should be done in a couple hours.

A small rant, regarding Destroyer The U-Boat Hunter.

Stop telling me that games were updated if only the Windows version was. I already asked you to be more careful about this. There are also Mac and Linux players and they have the right to have updated games just like they have them on Steam. If you write here "game X was finally updated" you only create confusion for other people and you force me to make additional work to be sure whether all ports were updated or only the Windows one.

Furthermore, and I'm saying this at the cost of sounding arrogant, stop complimenting developers when they only update the Windows port. I've seen many people celebrating when games were "finally updated" and complimenting the developers. They don't deserve compliments. Keeping a game up to date only for Windows on GOG when on Steam it's routinely updated for all three ports is not a good job, is a poor job.

Some leniency is important because, by definition, Early Access is an explicit statement of "you're not buying the full game yet" and it's a phase where updates are very often experimental and not meant to be definitive. Maybe an update brings further issues that weren't expected, maybe it balances the game in a way that people don't like. There's just too much uncertainty. That said, if games in Early Access have too big discrepancies, or if the game sees full release on Steam but on GOG remains in Early Access for too long, especially if there's no communication from devs, then it belongs here.

I understand, and I'm sorry.
I wasn't thinking about all that (about other versions) and was simply happy to see that the dev answered and did the update as he said.

The Dawning Clocks of Time: Director’s Cut
Gog: version 6.0.1 (native resolution: 640x400)
Steam: version 7.0

I checked the Director's Cut in my library and the changelog says 7.0, so it seems we're supposed to have it.

Looks like the offline installer is outdated but I'll test that now.

Edit: The offline installer is out of date but Galaxy is not.

Forgive me if this is already on the list, but I just happen to notice that Kamikaze Lassplanes here on GOG is on 1.0, but Steam has 1.3.22. Unless I'm stupid and don't understand how to look this up on GOG.

I did search the game in the forums, but it pulled up too much to be able to find if it was in this thread specifically.

Beloved Rapture

Totally out of date on GOG. The developer only was updating it on GOG for about 1 month after release and then just "dropped" any support completely, after. If someone is able to contact them... may ask for an update. GOG apparently is not "bothering".

GOG Version is V. 1.1.8, more than 1 year behind
Steam Version is V. 2.0.4 or higher

Missing OST

There is a free expansion inside "Free Expansion: Lost Songs of Archon" which is totally missing on the GOG version, so not just bug fixing, a lot of content not available on the GOG version. It was not on the list of "2. class games, so i was accidentally buying it". No one said a single thing about... not on the reviews, not on the list. Just a small hint on the forums... i will now make this hint more visible.

Guess if the issue can not be fixed, it could become my first reimbursement on GOG ever but... at some point the limit is here. I will then just rip apart the Steam version, if it have to be.

Sources:
https://www.gogdb.org/product/1698642015#builds

https://steamdb.info/app/2017620/history/

Sure, the devs said "this game is a success story" which had a kickstarters support and now they are already building another game. As well the people on PC gaming wiki apparently can not be "arsed" even to make an article about, while the dev can not be arsed to support GOG... so everything is relative.

For sure, if they do not react promptly now... i will not handing them out any cents; this is offensive, no less than that: They got 25 days... and GOG as well. If the dev is "dropping" GOG... after GOG is informing them... then "so be it"... GOG does not need such publishers, if they are not trying to make things happen... for everyone.