Active Sky Cloud Art: the P3D v6 support on the box only works if you turn P3D v6 off

Type "Active Sky" into a store search in 2026 and you get two things with almost the same name. One is Active Sky FS, HiFi's live weather engine for MSFS 2020 and 2024, currently 24.99 EUR and updated roughly monthly. The other is Active Sky Cloud Art, 19.99 EUR, and it does not touch MSFS at all. It is a cloud and sky texture pack — plus a set of 3D cloud models and a small resident app — for Flight Simulator X and Prepar3D. If you fly MSFS, close this tab. You want the other product, and we reviewed it separately.

This one, ASCA to everyone who owns it, went on sale on 8 July 2016 at 29.99 dollars introductory-priced to 19.99. It replaces everything above the horizon in the sprite-cloud simulators: cirrus, cumulus, stratus, thunderstorm textures, sky colour sets and lighting. What made it different from REX and the rest was never the bitmaps. It was the two things around them — brand new 3D cloud structure models, so an overcast layer is actually solid instead of a lattice of gaps, and real-time texture swapping, so the sky changes as you fly through changing weather without shutting the sim down.

Ten years on, the interesting fact about ASCA is not in the marketing. It is in HiFi's own downloads page, where ASCA sits under the heading Legacy Products alongside Active Sky 2012 and Active Sky Next. Its last build is B8584, update 070323 — 3 July 2023 — which added ASP6 and P3D v6 support a week before Active Sky P3D v6 went into early access. Nothing since.

And there is a second fact, printed on HiFi's own product page in an asterisked note that appears three separate times: under Prepar3D v6's volumetric clouds, no ASCA support is available. Under P3D v5's Enhanced Atmospherics with volumetrics on, the same. The store title reads FSX P3D3-6. The footnote takes most of v5 and v6 back. That is the argument this review is about, and it is not a gotcha — HiFi discloses it clearly and repeatedly. It is just very easy to miss when a shop lists "P3D v6" as a supported platform.

We read 23 sources for this: the developer's product, downloads and ASP6 pages, four store listings, one full written review, six AVSIM threads including the 605-post release thread, four threads on HiFi's own support forum, three video reviews and the EnvTex product page. Reddit is blocked in this environment, so the usual sentiment-at-a-glance check is missing; for a product whose audience mostly argues on AVSIM and HiFi's forum, that matters less than it would for an MSFS add-on.

What you are actually buying

One licence, one price, every supported simulator. There is no FSX/P3D split here, which is worth saying because Active Sky itself has always been sold per-platform.

Item	Price	Notes
ASCA at simMarket	19.99 EUR	simMarket's terms say displayed prices "include the respectively applicable value added tax" — which for an unresolved session means 0%, so this is not a like-for-like figure
ASCA at Aerosoft	19.99 EUR	Explicitly listed VAT excluded
ASCA at Just Flight	22.99 USD	Just Flight's listing still stops at P3D v5
Optional HD content pack	Free with purchase	Unlocks 4096x4096 cirrus/cloud textures; without it you are capped at 2048x2048
Active Sky (AS16 / ASP4 / ASP3D / ASP6)	39.99 EUR + tax for ASP6	Not required — but the dynamic texture loading is the reason to buy ASCA, and it needs one of these

HiFi does not run its own store. The product page says plainly that Active Sky products are sold through authorised resellers only — simMarket, Just Flight, Aerosoft and Flight1 — and adds that "Resellers may offer different base currency, policies and effective pricing." So there is no developer price to check the store price against. What you can say is that 19.99 EUR at simMarket and 19.99 EUR at Aerosoft are the same number describing different things, and neither is obviously the cheaper buy until you know your own VAT position. It also goes on sale: in March 2021 Just Flight, Aerosoft and Flight1 all ran 30% off across the HiFi range simultaneously, and that pattern has repeated. If 19.99 is a stretch, wait.

The real compatibility list

The one on the box is FSX, FSX:SE and P3D v3 through v6. The one that matters is this:

• FSX (SP2/Acceleration) and FSX: Steam Edition — everything works.
• P3D v3.2 and later, v4 — everything works. Nothing earlier than v3.2 is supported at all.
• P3D v5 with Enhanced Atmospherics off — everything works. This is the configuration ASCA was built for.
• P3D v5 with EA on, volumetrics off — cloud structures and textures only. Sky colours and lighting come from P3D.
• P3D v5 with EA on, volumetrics on — trueSKY takes the clouds too. ASCA is doing nothing.
• P3D v6, legacy clouds — cloud structures and textures only.
• P3D v6, volumetric clouds — nothing. No ASCA support at all.
• MSFS 2020, MSFS 2024, X-Plane — not a target platform and never was.

The 2.44 GB download is not just bitmaps, and the review scores it accordingly. You get cloud model files, a theme installer, a weather-influence configuration utility that ties texture choice to the weather Active Sky is reporting, and an Art Tools API for building your own content.

What the community consistently praises

Solid overcast. This is the finding that repeats hardest, and it starts on day two. On 11 July 2016 an AVSIM poster flying the iFly NGX between Melbourne and Sydney wrote that it was the "first time I have ever seen solid cloud deck in years of simming". The same page has another user noting that the FSX "doorway" effect — where you see the individual sprite edges as you enter a cloud — is replaced by a genuine transition. Nine years and forty forum pages later nobody has argued with that. The 3D structures are the product.

Thunderstorms with volume. Repeatedly described as bigger and more intimidating than anything the sims do natively. simFlight's February 2017 review, which was otherwise lukewarm on ASCA, still said it was impressed by how ASCA models clouds and that "thunderstorms are massive and intimidating cloud structures".

Dynamic swapping, when it is paired with Active Sky. The Full Dynamics theme runs up to eight texture sets simultaneously — 128 cloud textures — and changes them as the weather changes, with no sim restart. simFlight found the switching genuinely smooth in practice and only noticeable when there were very few clouds on screen to hide it. Nobody else in the FSX/P3D generation did this.

It slots into a stack that the community settled a decade ago. By August 2017 the AVSIM consensus was already fixed: Active Sky for weather, ASCA for clouds, EnvTex for sky colours and ground, EnvShade or PTA for shaders. TOGA Projects still ships 64 sky presets with "full and automatic integration for Hifi Active Sky Cloud Art" and three photoreal cloud presets on top. Two products that overlap on paper deliberately do not fight.

Performance that mostly does not hurt. More on that below, but it is a praise point and it repeats independently.

What keeps coming up as a problem

The EA and volumetric wipe-out. Status: by design, still open, and it defines the product in 2026. This is not a bug, it is the architecture: ASCA works by replacing sprite textures and sprite cloud models, and P3D v5's Enhanced Atmospherics and P3D v6's volumetric engine do not use sprites. In June 2020 an AVSIM thread was already asking how to cleanly strip ASCA out of P3D v5 to try EA. In February 2021 a user reported HiFi's support closing his ticket with the conclusion that ASCA and EA do not work together, and he uninstalled ASCA. On HiFi's own forum in June and July 2021, two users found ASCA clouds silently replaced by default P3D clouds under EA even with volumetrics off; HiFi's developer Damian walked them through it on 6 July 2021 and one of them fixed it with a full reinstall, the other simply turned EA off and stayed there.

Texture repetition. Status: still open. On 11 July 2016, three days after release, an AVSIM poster looked at a launch screenshot and counted at least eleven repeats of the same cloud texture in a single frame. It is the standard sprite-cloud complaint and the HD pack's 4096x4096 textures reduce it without solving it.

REX breaks the dynamics. Status: mitigated by configuration, never fixed. From December 2017 on AVSIM: REX Texture Direct's cloud and sky textures break ASCA's dynamic mode, and the user in question was not sure how to recover other than reinstalling. The workaround is well documented — let ASCA own clouds and let EnvTex or REX own ground and water — but only one product can own the sky, and the ASCA/EnvTex pairing is the one the community actually uses.

The install and activation machinery is the weakest part of the product. Status: partly fixed, residual cases still open. Through late 2020 a multi-page thread on HiFi's forum tracked an error reading "ASCA graphics installation takes more than 7 minutes to complete. Skipping graphics activation". Damian acknowledged on 7 December 2020 that it was in many cases caused by old ASCA content left in previous simulator locations, that HiFi's earlier guidance had been simplified after complaints about complexity, and promised "more automation and integrity checks in the next builds". Update 121220 shipped six days later. It did not fix everyone: one poster reported on 14 December 2020 that he was still affected. In May 2024 a new buyer could not launch the program at all — a .NET unhandled exception at the registration window — and the thread is still tagged "No Response".

The Art Tools API stalled. Status: still open. The product page has said since 2016 that user-created content is "Currently enabled for Sky Textures only" with more categories "planned to be added soon". Ten years and a final 2023 build later, it is still sky textures only.

Nobody can give you a straight compatibility answer. Status: still open. simMarket titles the product "P3D3-6". HiFi's page lists v3 through v6 with a three-paragraph asterisk. Just Flight's product page in August 2026 still lists "P3D v5, P3D v4, P3D v3, Flight Simulator X, FSX: Steam Edition" — no v6 at all. Aerosoft's compatibility note says flatly that it is "not compatible with P3D v5's Enhanced Atmospherics mode", which is more absolute than HiFi's own wording. Four shops, four answers.

Performance and stability

HiFi's claim — "A primary design focus for ASCA was performance" — holds up better than most marketing lines in this category. On 11 July 2016 an AVSIM user running P3D v3.3.5 with the iFly NGX, Full Dynamics and clouds out to 100nm reported 30 to 32 fps against a 33 lock at FL320 through solid overcast, on a card he described as unremarkable, and said HiFi had definitely improved performance. Another poster the same week compared AS16 plus ASCA directly against his previous ASN plus REX setup on P3D v3 and found no frame rate drop and no new stuttering. simFlight, testing on P3D v3.3/3.4 and FSX:SE, found no performance penalty that was not simply explained by there being more cloud on screen in heavy weather. That is three independent reads pointing the same way.

The caveats are about memory rather than frames. The HD pack's 4096x4096 textures are where users get into trouble: in the same December 2020 forum thread, a user chasing DXGI_ERROR_DEVICE_REMOVED crashes concluded it was VRAM handling with textures set to 4096, and HiFi's Damian was explicit that the device-hung errors were a P3D and add-on interaction rather than an ASCA fault. He was right to say so, and it is worth repeating: a lot of what gets blamed on ASCA in P3D crash threads is not ASCA.

The one genuinely recent stability event is not ASCA-specific either. On 15 October 2025 Damian posted that Windows 11 updates KB5066835 and KB5065789 had broken network HTTP functionality in a way that crashed every Active Sky product, told users to roll the updates back, and marked the thread resolved when Microsoft's own fix landed on 18 October 2025. A three-day turnaround with a public workaround on a nine-year-old product line is not the behaviour of a developer who has walked away.

Who should buy it

The FSX or FSX: Steam Edition holdout. Buy it. There is no EA, no trueSKY, no volumetric engine to compete with — you get the whole product, the price is 19.99 EUR, and nothing else in that ecosystem does 3D cloud structures. This is the cleanest recommendation in the review.

The P3D v4 or v5 flyer who runs EA off and already owns ASP3D. Buy it. This is the configuration ASCA was designed for and the one every enthusiastic forum post is describing. The dynamics you already paid Active Sky for only exist if you own this.

The P3D v6 flyer who prefers legacy clouds. Buy it with your eyes open. You get the cloud structures and the cloud textures, and you lose the sky colours and lighting to P3D. That is arguably still worth 19.99 EUR, because the structures are the good half. Read HiFi's asterisk first.

The P3D v6 flyer running the new volumetric clouds. Do not buy it. ASCA will do literally nothing for you. This is the profile the store title misleads, and it is the fastest-growing part of the P3D userbase. If you want your volumetric skies driven properly, the money belongs on Active Sky P3D v6 instead.

The screenshot chaser. Probably not. simFlight's verdict on the textures alone — "Good, but not the best around" — has held since 2017, and the December 2017 AVSIM threads are full of people who prefer REX Soft Clouds for a single beautiful frame. ASCA wins over a two-hour flight, not over one press of the screenshot key.

The MSFS 2020, MSFS 2024 or X-Plane 12 flyer. Not your product. Buy Active Sky FS or Active Sky XP 12 and do not let the shared name cost you 19.99 EUR.

Where it stands today

ASCA is a well-made piece of software that solved the sprite-cloud problem about as thoroughly as it could be solved, and then the platform moved underneath it. Nothing about the product got worse. Prepar3D grew a volumetric cloud engine, and the thing ASCA replaces stopped being what the simulator draws. That is not abandonment and it is not the developer's failure; it is what happens to a texture pack when the renderer changes.

Whether HiFi still supports it depends on what you mean. There has been no new build since 3 July 2023, there is no ASCA sub-forum on HiFi's support site, and the downloads page files it under Legacy Products. But the Prepar3D and FSX sections of that forum had posts in June and July 2026, HiFi staff answer ASCA tickets — a May 2024 launch failure got two substantive replies inside 48 hours — Active Sky P3D v6 received build 9412 on 8 October 2025, and the October 2025 Windows 11 crash was diagnosed publicly in a day. Legacy here means frozen, not orphaned. The distinction is real and buyers should hold HiFi to the honest version of it: you are buying a finished product that will keep working and will not gain features.

The store record backs a moderate rather than a glowing conclusion. simMarket shows 14 ratings — eight at five stars, four at four, one at three, one at two, none at one, a true average of 4.36 against the 4 the site prints — and a place in its all-time top ten, which reflects a decade of steady sales rather than current demand. Independent video coverage stopped around 2018. Nobody has published a written review of ASCA in years. That is a product with a settled reputation and a shrinking, but real, audience.

At 19.99 EUR in 2026 the maths is simple. If your simulator still draws sprite clouds, ASCA is the best thing you can put in front of them and it is cheap. If your simulator draws volumetric clouds and you use them, ASCA is 19.99 EUR for nothing. Everything else in this review is detail.