macOS
Universal app for Apple silicon and Intel Macs
Download· 478 MB for macOS- File
- Synapact-macOS.zip
- Version
- 0.4.3
- Built
- 19 October 2026
- Size
- 478 MB (478,418,998 bytes)
- SHA-256
c6b5757d692189199e31f5cd13904f17dace803878856f358b4e6549c1e556ff
A faction card battler
Synapact
Build your deck. Program your energy. Change the outcome.
Three peoples, one ancient accord, 150 cards. Free for macOS and Windows.
Synapact is a free desktop game for macOS and Windows. Open this page on your computer to download it.
Trailer · 1:41
Do you still choose each other?
The First Contact set
150 cards. Every one illustrated.
Fifty anchored to each faction, including twenty-four bridges that belong to two, and three Legendaries. A few of them:
What makes it different
A card battler you program
Program your energy
No land cards, and no drawing the wrong resources. Every deck carries a ten-slot energy row in an order you choose. Each of your turns unlocks the next slot and refills the ones already open.
Unspent energy stays up through your opponent’s turn, ready for a response. Faction decides how a card is paid for, never whether it fits your deck.
Turn 44 energy: 2 Concord, 2 Lumin
- Slot 1: The Lumin, unlocked
- Slot 2: The Lumin, unlocked
- Slot 3: The Concord, unlocked
- Slot 4: The Concord, unlocked
- Slot 5: The Lumin, locked
- Slot 6: The Concord, locked
- Slot 7: The Foundry, locked
- Slot 8: The Foundry, locked
- Slot 9: The Concord, locked
- Slot 10: The Lumin, locked
The example from the design notes: two Lumin before the first Concord, and Foundry from turn seven.
Answer on either turn
Priority and a response stack let Fast cards land before and after attacks, on your turn or theirs. Nine Prepared cards can be set face down and revealed when you choose; six Energy Enhancements add energy now or after your next refill.
150 cards, three factions
Fifty anchored to each faction, including twenty-four bridges that belong to two at once. Decks of forty mix any factions and hybrids you own: there are no faction restrictions.
A thirty-chapter campaign
The Renewal, in five acts, with minibosses and act bosses whose powers fire on a public schedule. The answers you give come back later in the story.
Earn your collection
Start with one of seven complete starter decks. Win to earn points, buy packs and pull foils. The first clear of each chapter awards a pack, and bosses award packs that are all foil.
Three AI opponents
Cadet, Tactician and Strategist, plus a Story difficulty for players here for the narrative. The AI never looks at your hand, your face-down cards or either deck’s order.
Battlefields in 3D
The Orbital Foundry, Frontier Haven and the Prism Expanse are modeled dioramas, and the cards on them are lit, beveled objects that lift, tilt, flip and catch the light on foils.
An electronic score
Six instrumental tracks: a main theme, one for each faction, regular battles and a heavier cue for bosses, crossfading as the game moves between them.
Free, no microtransactions
No real-money purchases, no account and no connection needed. Beyond your starter deck, every card you own is earned by playing, offline.
The Synapact
Three peoples. One light.
Nine hundred years ago, three peoples agreed to share one light. They called it the Synapact.
Every three hundred years, each founding people must sing its consent to the accord again, leaving one beat of the song silent for the ones who come after. Now the bell has rung, and it asks one question: do you still choose each other?
The Foundry
Black energy · an obsidian core and a silver gear
Mechanoids, drones and synthetic intelligences.
- Sacrifice
- Salvage
- Plating
- Recursion
Starter deck: Foundry Ascendant
The Concord
Green energy · a laurel and a living branch
Humans and the near-human cultures of the frontier.
- Formation
- Coordinated pressure
- Protection
- Healing
Starter deck: Concord Vanguard
The Lumin
Blue energy · an orbital star
Extraterrestrial organisms and distributed minds.
- Knowledge
- Evasion
- Tempo
- Phasing
- Counters
Starter deck: Lumin Echo
Born between them
24 bridge cards belong to two factions at once. Half cost energy of both; the other half take either.
Cyborgs
The Foundry and the Concord
Starter deck: Steel & Soul
Starblood kin
The Concord and the Lumin
Starter deck: Starblood Accord
Biomechanical aliens
The Foundry and the Lumin
Starter deck: Living Circuit
The campaign · The Renewal
Thirty chapters. One question.
The silent Sequencer rings the renewal bell and travels to the Foundry, the Concord and the Lumin, and to the bridge peoples born between them. Each act pledges one answer to the bell’s question.
Entropy, the accord’s guardian, means to fill the song’s silent beat with one certain chord that nobody can ever refuse.
Act I · Chapters 1–6
The Bell at Kethra
Someone rang a bell that has been silent for three hundred years.
- Miniboss
- The Pruner
- Act boss
- The Last Architect
Act II · Chapters 7–12
The Quiet Clause
Safety has a price. The Concord is about to pay it.
- Miniboss
- Magistrate Corvin Hale
- Act boss
- Admiral Iona Vale
Act III · Chapters 13–18
The Late Reply
A slow answer is still an answer.
- Miniboss
- Queen Vessary
- Act boss
- The Untranslated
Act IV · Chapters 19–24
Living Seams
The ones born in the gaps were never given a vote.
- Miniboss
- The Pruner
- Act boss
- Dr. Ilse Arden
Act V · Chapters 25–30
The Open Interval
Leave a space in the song for the ones who come after.
- Miniboss
- Certain Tally
- Act boss
- Entropy
- Act I teaches the game one mechanic per turn, through your companions.
- Story difficulty keeps every chapter as written and makes the opponent play a gentler game.
Borrow a deck
Six decks, ready to play
Try six advanced decks without owning their cards: forty cards each, a fixed ten-slot energy sequence, and a guide to openings, combinations, timing and weaknesses. They play in practice and in every unlocked chapter.
FoundryFurnace Requiem
Sacrifice / salvage · Expert
Trade expendable machines for cards, rebuild from the wreckage, and accelerate into The Last Architect.
ConcordUnited Front
Formation / wide pressure · Advanced
Build a coordinated Concord formation, protect crucial bodies, and turn a wide field into a decisive attack.
LuminNull Horizon
Veil / response control · Expert
Pressure through Veil while prepared counters, stuns, and returns keep enemy defenses out of position.
Foundry × ConcordChrome Vanguard
Hybrid combat / permanent buffs · Advanced
Combine resilient machines and Concord formations, then turn permanent buffs into favorable attacks and blocks.
Concord × LuminShared Horizons
Arrival value / prepared rescue · Advanced
Replay valuable arrivals with prepared rescues, sustain a hybrid formation, and open the way for evasive finishers.
Foundry × LuminEntangled Engine
Graveyard value / control · Advanced
Use biomechanical card advantage, salvage, and prepared answers to outlast the enemy and rebuild behind Ward.
Download · Version 0.4.3
Play Synapact
Free for macOS and Windows. No account, no launcher, no connection needed.
Synapact is a free desktop game for macOS and Windows. Open this page on your computer to download it.
Windows
64-bit (x86-64)
Download· 455 MB for Windows- File
- Synapact-Windows.zip
- Version
- 0.4.3
- Built
- 19 October 2026
- Size
- 455 MB (454,970,944 bytes)
- SHA-256
6ed11f25fe76771ea0e3f18d74d243ffbc4410eda5498494eb8161490ce2e644
Opening it on a Mac
- Double-click Synapact-macOS.zip to unzip it, then move Synapact.app to your Applications folder.
- This build is signed ad hoc rather than notarized by Apple, so macOS asks before the first launch. Control-click (or right-click) Synapact.app, choose Open, then choose Open again.
- If there’s no Open button (macOS 15 Sequoia and later), try to open the app once, then go to System Settings › Privacy & Security, scroll to Security and click Open Anyway.
After the first launch it opens like any other app.
Opening it on Windows
- Right-click Synapact-Windows.zip and choose Extract All. You get a Synapact folder with Synapact.exe and its license notices.
- Run Synapact.exe. This build isn’t code-signed yet, so Microsoft Defender SmartScreen may say “Windows protected your PC”. Click More info, then Run anyway.
Keep THIRD_PARTY_NOTICES.txt with the game if you share it.
System requirements
| macOS | Windows | |
|---|---|---|
| System | macOS 13 Ventura or later on Apple silicon macOS 11 Big Sur or later on Intel | Windows 10 or 11, 64-bit |
| Graphics | Metal | A graphics card with Vulkan support |
| Storage | About 655 MB unzipped | About 593 MB unzipped |
| Display | A window of at least 1000 × 625. Any shape from 5:4 to 21:9 fills the screen. | |
| Controls | Mouse and keyboard | |
| Network | None. The game plays entirely offline. | |
Check a download’s SHA-256
Compare the result with the SHA-256 above. On a Mac, in Terminal:
shasum -a 256 ~/Downloads/Synapact-macOS.zipOn Windows, in PowerShell:
Get-FileHash $HOME\Downloads\Synapact-Windows.zip