diff --git a/uni.py b/uni.py
new file mode 100644
index 0000000..e3b0754
--- /dev/null
+++ b/uni.py
@@ -0,0 +1,316 @@
+#!/usr/bin/env python3
+
+import sys
+import os
+import json
+import time
+import subprocess
+
+STATE_FILE = os.path.expanduser("~/.uni/state.json")
+
+
+# -------------------------
+# STATE
+# -------------------------
+def load_state():
+    if not os.path.exists(STATE_FILE):
+        return {"backends": {}, "packages": {}}
+
+    with open(STATE_FILE, "r") as f:
+        return json.load(f)
+
+
+def save_state(state):
+    os.makedirs(os.path.dirname(STATE_FILE), exist_ok=True)
+    with open(STATE_FILE, "w") as f:
+        json.dump(state, f, indent=2)
+
+
+# -------------------------
+# NORMALIZATION (FIX)
+# -------------------------
+def normalize_state(state):
+    fixed = {}
+
+    for pkg, entries in state.get("packages", {}).items():
+
+        # old format: "apt"
+        if isinstance(entries, str):
+            fixed[pkg] = [{"backend": entries}]
+            continue
+
+        # already correct list
+        if isinstance(entries, list):
+            clean = []
+            for e in entries:
+                if isinstance(e, dict) and "backend" in e:
+                    clean.append(e)
+                elif isinstance(e, str):
+                    clean.append({"backend": e})
+            fixed[pkg] = clean
+            continue
+
+        fixed[pkg] = []
+
+    state["packages"] = fixed
+    return state
+
+
+# -------------------------
+# BACKEND DETECTION
+# -------------------------
+def has(cmd):
+    return subprocess.call(
+        ["which", cmd],
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL
+    ) == 0
+
+
+def detect_backends(state):
+    state["backends"] = {
+        "apt": has("apt"),
+        "dnf": has("dnf"),
+        "pacman": has("pacman"),
+        "flatpak": has("flatpak")
+    }
+    return state["backends"]
+
+
+# -------------------------
+# RESOLVER
+# -------------------------
+def resolve_backend(pkg, state):
+    gui_apps = ["firefox", "discord", "spotify", "vscode"]
+
+    if pkg in gui_apps and state["backends"].get("flatpak"):
+        return "flatpak"
+
+    if state["backends"].get("apt"):
+        return "apt"
+    if state["backends"].get("dnf"):
+        return "dnf"
+    if state["backends"].get("pacman"):
+        return "pacman"
+
+    return None
+
+
+# -------------------------
+# CONFLICT CHECK
+# -------------------------
+def check_conflict(state, pkg, backend):
+    if pkg not in state["packages"]:
+        return False
+
+    for e in state["packages"][pkg]:
+        if e.get("backend") != backend:
+            return True
+
+    return False
+
+
+# -------------------------
+# EXEC
+# -------------------------
+def run(cmd):
+    subprocess.run(cmd)
+
+
+def install_pkg(pkg, backend):
+    if backend == "apt":
+        run(["sudo", "apt", "install", "-y", pkg])
+    elif backend == "dnf":
+        run(["sudo", "dnf", "install", "-y", pkg])
+    elif backend == "pacman":
+        run(["sudo", "pacman", "-S", "--noconfirm", pkg])
+    elif backend == "flatpak":
+        run(["flatpak", "install", "-y", pkg])
+
+
+def remove_pkg(pkg, backend):
+    if backend == "apt":
+        run(["sudo", "apt", "remove", "-y", pkg])
+    elif backend == "dnf":
+        run(["sudo", "dnf", "remove", "-y", pkg])
+    elif backend == "pacman":
+        run(["sudo", "pacman", "-R", "--noconfirm", pkg])
+    elif backend == "flatpak":
+        run(["flatpak", "uninstall", "-y", pkg])
+
+
+def update_all(state):
+    if state["backends"].get("apt"):
+        run(["sudo", "apt", "update"])
+        run(["sudo", "apt", "upgrade", "-y"])
+
+    if state["backends"].get("dnf"):
+        run(["sudo", "dnf", "upgrade", "-y"])
+
+    if state["backends"].get("pacman"):
+        run(["sudo", "pacman", "-Syu", "--noconfirm"])
+
+    if state["backends"].get("flatpak"):
+        run(["flatpak", "update", "-y"])
+
+
+# -------------------------
+# TRACKING
+# -------------------------
+def register_install(state, pkg, backend):
+    if pkg not in state["packages"]:
+        state["packages"][pkg] = []
+
+    state["packages"][pkg].append({
+        "backend": backend,
+        "time": int(time.time())
+    })
+
+
+def register_remove(state, pkg, backend):
+    if pkg not in state["packages"]:
+        return
+
+    state["packages"][pkg] = [
+        e for e in state["packages"][pkg]
+        if e.get("backend") != backend
+    ]
+
+    if not state["packages"][pkg]:
+        del state["packages"][pkg]
+
+
+# -------------------------
+# LIST
+# -------------------------
+def list_installed():
+    state = load_state()
+    state = normalize_state(state)
+
+    for pkg, entries in state["packages"].items():
+        backends = ", ".join([e["backend"] for e in entries])
+        print(f"{pkg} -> {backends}")
+
+
+# -------------------------
+# DOCTOR
+# -------------------------
+def doctor():
+    state = load_state()
+    state = normalize_state(state)
+    detect_backends(state)
+    save_state(state)
+
+    print("=== SYSTEM ===")
+    for k, v in state["backends"].items():
+        print(f"{k}: {'yes' if v else 'no'}")
+
+    print("\n=== HEALTH ===")
+    broken = []
+
+    for pkg, entries in state["packages"].items():
+        if not isinstance(entries, list):
+            broken.append(pkg)
+            continue
+
+        for e in entries:
+            if not isinstance(e, dict) or "backend" not in e:
+                broken.append(pkg)
+
+    print("OK" if not broken else f"broken: {len(broken)}")
+
+    print("\n=== CONFLICTS ===")
+    conflicts = {}
+
+    for pkg, entries in state["packages"].items():
+        backends = list(set([e["backend"] for e in entries]))
+
+        if len(backends) > 1:
+            conflicts[pkg] = backends
+
+    if not conflicts:
+        print("none")
+    else:
+        for k, v in conflicts.items():
+            print(f"{k}: {', '.join(v)}")
+
+    print("\n=== SUMMARY ===")
+    print(f"packages: {len(state['packages'])}")
+    print(f"conflicts: {len(conflicts)}")
+    print(f"corrupt: {len(broken)}")
+
+
+# -------------------------
+# INSTALL / REMOVE
+# -------------------------
+def install(pkg):
+    state = load_state()
+    state = normalize_state(state)
+    detect_backends(state)
+
+    backend = resolve_backend(pkg, state)
+
+    if not backend:
+        print("no backend")
+        return
+
+    if check_conflict(state, pkg, backend):
+        print("WARNING: backend mismatch")
+
+    install_pkg(pkg, backend)
+    register_install(state, pkg, backend)
+    save_state(state)
+
+
+def remove(pkg):
+    state = load_state()
+    state = normalize_state(state)
+
+    if pkg not in state["packages"]:
+        print("not tracked")
+        return
+
+    for e in state["packages"][pkg]:
+        remove_pkg(pkg, e["backend"])
+
+    del state["packages"][pkg]
+    save_state(state)
+
+
+def update():
+    state = load_state()
+    detect_backends(state)
+    update_all(state)
+
+
+# -------------------------
+# MAIN
+# -------------------------
+def main():
+    if len(sys.argv) < 2:
+        print("install|remove|update|list|doctor")
+        return
+
+    cmd = sys.argv[1]
+
+    if cmd == "install":
+        install(sys.argv[2])
+
+    elif cmd == "remove":
+        remove(sys.argv[2])
+
+    elif cmd == "update":
+        update()
+
+    elif cmd == "list":
+        list_installed()
+
+    elif cmd == "doctor":
+        doctor()
+
+    else:
+        print("unknown")
+
+
+if __name__ == "__main__":
+    main()
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