The Sanctuary: Shattered Sun demo landed on Steam this week, and the crowd it attracted is exactly what the developers hoped for: veteran Supreme Commander and Total Annihilation players who have been waiting more than a decade for a true successor. Sanctuary is built by former Gas Powered Games staff on the DOTS engine, targets thousands of units per side, and holds strategic zoom as a first-class feature. It is not finished, though. The demo is fun, but campaign, multiplayer polish, and unit variety are all works in progress.
If you played the demo and want something similar to fill the wait, here are seven Sanctuary: Shattered Sun alternatives for desktop that already deliver massive-scale real-time strategy today. Every pick keeps the core appeal: thousands of units, economy-driven macro, and matches that end with continent-sized destruction.
Quick comparison
| Game | Best for | Free? | Starting price | Standout feature |
|---|---|---|---|---|
| Beyond All Reason | Modern free Supreme Commander successor | Yes | Free | 5000-unit battles, tuned by veteran devs |
| Supreme Commander: FAF | The original scale, still alive | Yes | Free (owning FA helps) | Community-run servers, active ladder |
| Planetary Annihilation: Titans | Fighting across whole planets | No | Around $30 | Multi-planet campaigns, planetary artillery |
| Zero-K | Free lobby RTS with deep unit design | Yes | Free | Open source, active AI ladder |
| 0 A.D. | History nerds who want scale | Yes | Free | Historically accurate ancient civilisations |
| Warzone 2100 | Solo campaign junkies with a soft spot for the 90s | Yes | Free | Long single-player campaign, open source |
| Age of Empires IV | Modern polish, smaller scale | No | $60 | Mainstream production values, active esports scene |
Why Sanctuary: Shattered Sun’s alternatives are worth playing
Sanctuary’s central promise is a 2007-era experience — Supreme Commander scale — with a 2026-era engine. If you played the demo, you already know what that feels like: strategic zoom that pulls back to see whole map, economy that runs on mass and energy, tactical decisions decided by transport routes, scouts, and long-range artillery.
The alternatives below are the games that have kept that flame lit while Sanctuary works its way through early access. Some are older classics with active mod communities. Others are newer open-source projects. All of them scratch the same itch.
The alternatives
Beyond All Reason — Best free Supreme Commander successor
Beyond All Reason is the current best answer if you want Supreme Commander-scale battles right now for free. It runs on the Spring engine, was polished over years by veteran RTS developers, and reliably handles 5000-unit fights on modest hardware. The unit roster splits into three factions with distinct economies and tactical identities.
Where it falls short: Balance patches move fast enough that mastered strategies can shift week to week. Learning curve is steep and the tutorial does not do it justice.
Pricing:
- Free: Everything. Standalone launcher, no Steam required.
- Paid: None.
- vs Sanctuary: Free and finished; Sanctuary has more polish in unit animation and campaign framing.
Migrating from Sanctuary: Almost identical control scheme. The tech tree and unit ranks feel familiar within an hour.
Download: Beyond All Reason official site
Bottom line: Best pick for anyone who wants Sanctuary-style RTS today for zero dollars. Skip if you insist on a first-party publisher and store presence.
Supreme Commander: Forged Alliance Forever — Best for the original still alive
Supreme Commander: Forged Alliance Forever (FAF) is a community-maintained fork of the 2007 classic. The player base is smaller than Beyond All Reason but the ladder is still active, and matchmaking works. FAF adds modern features (replay tools, patch updates, working multiplayer) to a game that Steam left in stasis.
Where it falls short: You still need to own Forged Alliance for the assets. UI shows its age. Fewer new players than BAR.
Pricing:
- Free: FAF client.
- Paid: Forged Alliance itself is on Steam at low cost during sales.
- vs Sanctuary: The original template, with 18 years of community balance.
Migrating from Sanctuary: Controls are the direct inspiration. Anything Sanctuary teaches you carries over.
Download: Forged Alliance Forever plus Supreme Commander: Forged Alliance on Steam
Bottom line: Best pick for veterans who want to feel exactly the game Sanctuary is honouring. Skip if you want new content.
Planetary Annihilation: Titans — Best for planetary-scale carnage
Planetary Annihilation: Titans is the “what if RTS but bigger” experiment. Battles happen across entire planets, and the Titans expansion added huge experimental units that can single-handedly break a fortified enemy base. The planet-cracking Halley engines that let you shove worlds into each other are still the wildest move in RTS.
Where it falls short: Multiplayer population is small. Campaign is thin. Late-game framerate dips even on strong hardware.
Pricing:
- Free: No.
- Paid: Around $30, often discounted heavily during Steam sales.
- vs Sanctuary: More absurd. Sanctuary is disciplined; Planetary Annihilation goes for spectacle.
Migrating from Sanctuary: Economy model is close. Unit control feels different because production runs from mobile factories.
Download: Planetary Annihilation: Titans on Steam
Bottom line: Best pick when you want your RTS to end with planets being flung into each other. Skip if you want balance.
Zero-K — Best free RTS with deep unit design
Zero-K is an open-source RTS built on the same Spring engine as Beyond All Reason, with a heavier focus on unit customization and a single-player campaign. Every unit has cleanly telegraphed strengths and counters, and the AI opponents are strong enough to teach the game to newcomers.
Where it falls short: Multiplayer is quieter than BAR. Visual polish lags newer titles.
Pricing:
- Free: Everything. Free on Steam and via the Zero-K launcher.
- Paid: None.
- vs Sanctuary: Broader unit variety, smaller scale per match, better AI.
Migrating from Sanctuary: Similar terrain feel, different unit categories. Expect a few hours to relearn the tech tree.
Download: Zero-K on Steam
Bottom line: Best pick for a solo player who wants a mature RTS with AI ladders. Skip if multiplayer is your only reason to play.
0 A.D. — Best for history buffs
0 A.D. puts the Supreme Commander scale into ancient warfare. Thirteen playable civilisations, from the Britons to the Han, each with distinct units, structures, and win conditions. Development moves slowly because it is entirely volunteer, but every release adds real content and the free price is unbeatable.
Where it falls short: Combat pacing is slower than Sanctuary because armies are historically-scaled melee, not laser artillery. Development pace has drawn player criticism.
Pricing:
- Free: Everything. Open source under GPL.
- Paid: None.
- vs Sanctuary: Different flavour. Same big-picture scale, different fantasy.
Migrating from Sanctuary: Control scheme is Age of Empires-adjacent, not Supreme Commander. Learning curve is separate.
Download: 0 A.D. official site
Bottom line: Best pick when you want scale but also want history. Skip if you want space-age tech.
Warzone 2100 — Best solo campaign for RTS veterans
Warzone 2100 started as a 1999 Pumpkin Studios release, went open source in 2004, and has been quietly getting better ever since. The single-player campaign is unusually long, the design-your-own-vehicle system is deeper than most modern RTS games attempt, and multiplayer works over the internet.
Where it falls short: Small multiplayer population. Visuals are dated even after remastering.
Pricing:
- Free: Everything. Open source under GPL.
- Paid: None.
- vs Sanctuary: Older but more feature-complete. Sanctuary looks better.
Migrating from Sanctuary: Not a direct match. Warzone 2100 rewards research and vehicle design more than economy timing.
Download: Warzone 2100 official site
Bottom line: Best pick for solo RTS fans who like campaign depth. Skip if you want a modern coat of paint.
Age of Empires IV — Best mainstream RTS with modern polish
Age of Empires IV is the outlier on this list. Smaller unit counts, mainstream production values, and a live-service-flavoured live scene. If Sanctuary’s scale is too much for you and you want something more contained but still mechanically deep, AoE IV is where most RTS players are actively playing in 2026.
Where it falls short: Not the massive-scale experience Sanctuary is going for. Some civilisations feel dominant while others sit ignored.
Pricing:
- Free: No.
- Paid: Around $60 standard, expansions extra.
- vs Sanctuary: Smaller, tighter, more polish.
Migrating from Sanctuary: Different feel. Age IV rewards timing and micro; Sanctuary rewards macro and logistics.
Download: Age of Empires IV on Steam
Bottom line: Best pick when you want an active RTS scene with tournaments, streamers, and updates. Skip if you want continent-sized battles.
How to choose
Pick Beyond All Reason if you want the closest thing to Sanctuary you can play today, without paying, without waiting.
Pick Supreme Commander: Forged Alliance Forever if you want to feel the original vision Sanctuary is chasing, and you don’t mind older UI.
Pick Planetary Annihilation: Titans when the demo scale wasn’t enough and you want whole planets involved.
Pick Zero-K for a solo experience with strong AI.
Pick Age of Empires IV if Sanctuary is too much and you want a smaller RTS with mainstream polish.
Stay on the Sanctuary: Shattered Sun demo if you want to watch the game evolve. The developers are engaged with the community and updates are landing regularly.
FAQ
Is Beyond All Reason really free?
Yes. Beyond All Reason is developed by a volunteer team and distributed for free through its own launcher and (in early access preview) Steam. There is no paid tier.
Do I need to own Supreme Commander to play FAF?
Yes for full multiplayer content. The FAF client is free but requires Supreme Commander: Forged Alliance assets, and Forged Alliance is available on Steam and GOG for cheap during sales.
What is the biggest-scale RTS I can play right now?
For sheer unit count on a single match, Planetary Annihilation: Titans and Beyond All Reason both scale into the thousands. Sanctuary aims for similar and higher, but is not yet finished.
Are any of these games multiplayer-friendly for beginners?
Beyond All Reason and Age of Empires IV both have populated ladders with visible ranks and matchmaking that pairs newcomers with newcomers. Zero-K also has newbie-friendly rooms most nights.
Do these games run on Linux?
Beyond All Reason, Zero-K, 0 A.D., and Warzone 2100 all have first-class Linux builds. Supreme Commander: FAF and Planetary Annihilation: Titans run well under Proton on Steam Deck and desktop Linux.
