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A simple yet agnostic save & load toolkit for Unity. JSON / Binary / AES-encrypted / PlayerPrefs / Cloud, multi-profile, autosave, version migration, async, ScriptableObject support. 4 demos.Still rolling your own save/load every project?Stop. Save systems are a solved problem.SimpleSave is a complete, system-agnostic save/load framework that hides the boring parts (file IO, atomic writes, threading, version migration, encryption) behind a one-line static API. It scales from "I just need to save a high score" to "I have multi-profile cloud-synced AES-encrypted saves with offline-progress reconciliation" — without changing a single Save() call site.THE FACADE — ONE LINE PER OPERATION   SimpleSave.Save("player", playerData);   var loaded = SimpleSave.Load("player");That's the whole hello-world. No setup. No bootstrap manager to drag into your scene.The static facade auto-bootstraps on first call with sensible defaults (JSON files in Application.persistentDataPath/SimpleSave/, JsonUtility serializer).FIVE PLUGGABLE BACKENDSJsonFileBackend — Default. Plain JSON files. Human-readable. The .json files genuinely parse as JSON (the SSV2 envelope wraps payload in a clean JSON document).BinaryFileBackend — Same envelope, gzip-compressed. 30-70% smaller for typical save payloads. Drop-in replacement.EncryptedFileBackend — AES-256-CBC + HMAC-SHA256 + per-save salt + PBKDF2-SHA256 (100,000 iterations default, configurable, embedded in the wire format so you can re-tune without breaking back-compat). Encrypt-then-MAC ordering — tampered files fail HMAC before decryption is attempted, no padding-oracle vector.PlayerPrefsBackend — Wraps the envelope as base64 inside Unity's PlayerPrefs. For settings, keybindings, and tutorial-seen flags only — emits a warning above 8KB per slot.CloudBackend (abstract base) — Implement five async methods (Upload / Download / RemoteExists / DeleteRemote / ListRemoteKeys) for your provider (PlayFab, Unity Cloud, Steam Cloud, your own server). The base handles the entire ISaveBackend contract, local cache, conflict resolution hooks, and a persistent retry queue for failed background uploads. Bring the SDK calls; SimpleSave brings the architecture.Switch backends with one line: SimpleSave.SetBackend(new EncryptedFileBackend("passphrase"));TWO SERIALIZERS, AUTO-DETECTEDJsonUtilitySerializer — Default. Always available. Zero dependencies. Handles [Serializable] classes, structs, Vector3/Quaternion/Color, lists, primitive arrays.NewtonsoftSerializer — Reflection-bridged (no hard reference to Newtonsoft.Json). Drop in com.unity.nuget.newtonsoft-json via Package Manager and the bridge lights up automatically — no scripting defines, no menu toggles. Handles dictionaries, polymorphism, top-level lists, custom converters, contract resolvers, properties.Format-mismatch detection: every save stamps the serializer name in metadata. Loading a Newtonsoft save with the JsonUtility serializer (or vice versa) throws a clean SaveFormatMismatchException before deserialization.MULTI-PROFILE GAMES (SaveContext)For couch co-op, Renegade vs Paragon parallel playthroughs, NG+ runs, family-shared installs:   var profileA = new SaveContext(new JsonFileBackend(folderA), label: "Profile A");   var profileB = new SaveContext(new JsonFileBackend(folderB), label: "Profile B");   profileA.Save("player", a);   profileB.Save("player", b); // same key, different folder, no collisionEach SaveContext owns its own backend, serializer, autosave timer, migration registry, and event subscriptions. Zero cross-contamination. The static SimpleSave.* facade is just a wrapper around SaveContext.Default — single-profile games never need to think about contexts.AUTOSAVE — ONE CALL, FRAMEWORK-MANAGED LIFECYCLE   SimpleSave.EnableAutoSave(snapshotFactory: () => BuildCurrentSnapshot(), intervalSeconds: 30f);Periodic background saves with platform-aware lifecycle hooks (defaults to AutoSaveOnApplicationPause = true on Android/iOS where the OS reaps backgrounded apps). Returning null from the snapshot factory skips a tick — cheap "no changes since last save" guard. Pause / resume / force-save-now / events for spinner UI. One driver per SaveContext, so multi-profile games run independent timers.VERSION MIGRATION — RENAME FIELDS WITHOUT BREAKING LIVE SAVESYou shipped v1 with playerName. v2 renames it to displayName. Old saves still need to load:   SimpleSave.SetCurrentVersion(2);   SimpleSave.RegisterMigration(fromVersion: 1, toVersion: 2, upgrade: json => json.Replace("\"playerName\"", "\"displayName\""));Migrations operate on the JSON payload string (the old class shape may not even exist in your project anymore). Chain walker prefers +1 hops over longer hops, with longest-as-fallback. Cycle protection. Failed chains throw MigrationFailedException with the path walked so far.SCRIPTABLEOBJECT SUPPORTFor game state already living on a ScriptableObject (currency wallet, settings, achievements, idle-game stats):   SimpleSave.SaveAll("game", wallet, achievements, settings);   SimpleSave.LoadAll("game", new ScriptableObject[] { wallet, achievements, settings });Optional SaveableScriptableObject base class adds:- SaveKey override for stable identity across asset renames- OnBeforeSave hook to flush volatile/cached state into [SerializeField] fields- OnAfterLoad hook to rebuild derived cachesSchema-evolution pattern (schemaVersion field + OnAfterLoad remap) documented in Recipe 16. Duplicate SaveKeys throw DuplicateSaveKeyException — fail-fast prevents silent overwrites.ASYNC API — NO FRAME HITCH   await SimpleSave.SaveAsync("autosave", BuildSnapshot());   var data = await SimpleSave.LoadAsync("player");Every facade method has an async equivalent. Backends that implement IAsyncSaveBackend (CloudBackend, PlayerPrefs) dispatch natively. Sync-only backends (file backends) wrap their thread-safe sync methods in Task.Run via the IThreadSafeBackend marker — the main thread never sees the IO cost. Cancellation tokens supported throughout.ATOMIC WRITES + .BAK CRASH RECOVERYAll three file backends inherit a robust write path from FileBackendBase:- Write to .tmp, atomic-rename over the final, brief .bak preserves the previous version- If the process dies mid-rename and only .bak survives, the next Load auto-recovers it and emits one Debug.Log line- Either the new file is in place or the previous file is recoverable — no half-written corrupt stateEDITOR TOOLINGWindow > Living Failure > SimpleSave gives you four editor windows:Save Inspector — Open any save file (.json / .sav / .enc) by path or active-backend slot. Auto-detects format by first bytes ('{' = JSON envelope, '1F 8B' = gzip, otherwise prompts for AES passphrase). Decode the envelope, edit metadata + payload as plain JSON, write back. The killer support tool.Slot Browser — Lists every slot in the active backend with size + last-modified. Per-row: Inspect, Delete (confirm), Copy, Rename, Reveal in Explorer, Export to JSON. Search filter, refresh, backend status row.Export Slot to JSON — Decode + decrypt + decompress + unwrap into a plain readable JSON file. Player sends you a save? Drop it on your machine, repro the bug. Strict UTF-8 round-trip with base64 fallback for binary serializer payloads — never lossy.Import Slot from JSON — The other half of the export flow. Reads any v2 export file back into a slot.SaveConfig ScriptableObject — Right-click in Project > Create > SimpleSave > Config. Pick backend, serializer, custom directory, encryption passphrase, autosave defaults from the inspector. Drop in a Resources/ folder, tick Apply on Startup, and SimpleSave auto-bootstraps via [RuntimeInitializeOnLoadMethod] before the first scene loads. Zero code.FOUR PLAYABLE DEMO SCENESNot tech demos. Each exercises a different slice of the framework as a working reference you can read end-to-end.Save Sandbox — Every facade method on one screen. Slot picker, save/load/delete buttons, raw inspector, edit field rows, GetSlots enumeration. The API surface tour.Multi-Profile — Two SaveContext instances side-by-side with isolated folders under persistentDataPath/Profiles/A/ and /B/. Per-profile event log proves isolation. Use-case card lists the real-world patterns this unlocks.Synthwave Tycoon — Idle clicker built on a SaveableScriptableObject (ClickerStats). Three generator tiers, 5-second async autosave, sync save on quit/focus/scene-unload, "WELCOME BACK" offline-progress modal that fires on resume. Showcases the patterns idle games actually need.World Builder — 3D scene with editable Actor MonoBehaviours. Spawn Player / Enemy / Prop, edit name / level / HP / damage / AI / transform / tint via a left-list-right-inspector UI, save the entire scene to one slot. List of complex objects + transforms, all round-tripped.DOCUMENTATION- 17-page HTML documentation site (multi-page + single-page concatenation, neumorphic indigo theme): index, installation, quick-start, backends, serializers, autosave, profiles, ScriptableObjects, encryption, migrations, editor tools, API reference, recipes, demos, troubleshooting, about- Recipes.md with 24 copy-paste solutions for the situations you'll actually run into — RPG progress, idle clicker offline progress, multi-profile, encrypted mobile, slot browser UI, version migration, custom cloud backend, SIdF pairing- Unity 2021.3 LTS or later (including Unity 6)- All platforms — Windows, macOS, Linux, iOS, Android, WebGL, consoles- ~50 C# scripts (~30 Runtime, ~12 Editor, ~5 Tests, ~10 Demos)- 3 assembly definitions: SimpleSave.Runtime (zero third-party deps), SimpleSave.Demo, SimpleSave.Editor- 1 declared package dependency: com.unity.textmeshpro (used by demos and editor windows; auto-installed via Package Manager)- 5 demo scenes (Hub + 4 demos)- 17 HTML documentation pages + 1 CSS stylesheet + 1 Recipes.md- 5 storage backends: JsonFile, BinaryFile, EncryptedFile, PlayerPrefs, CloudBackend (abstract)- 2 serializers: JsonUtility (default), Newtonsoft (optional, auto-detected via reflection)- Encryption: AES-256-CBC + HMAC-SHA256 + per-save random salt + IV + PBKDF2-SHA256 (configurable iterations, default 100,000)- Wire format: SSV2 JSON envelope ({simpleSave, meta, payloadBase64})- File durability: atomic write (.tmp + rename), .bak crash recovery on partial-write corruption- Async API on top of IAsyncSaveBackend; thread-safe sync backends dispatch via Task.Run through the IThreadSafeBackend marker- 1 EditMode test suite (~9 test files) covering envelope round-trip + corruption, all backends, encryption tamper detection (wrong passphrase / tampered ciphertext / tampered HMAC / tampered IV / bad version / v1 legacy decode), migration chains, multi-profile isolation, ScriptableObject SaveAll/LoadAll round-trip + duplicate-key fail-fast, facade end-to-end + slot validation matrix- Optional: Newtonsoft.Json (com.unity.nuget.newtonsoft-json) — detected via reflection- Optional: pairs cleanly with Simple Idle Forge for idle-game persistence (manual integration, no hard dependency)This package utilized Claude AI for code generation assistance and documentation drafting.However, all AI-generated content was thoroughly human-reviewed, modified, and validated over three months of intensive development. No AI-generated code or documentation was used without significant human modification and verification.All technical decisions, architecture choices, and design patterns were made by me, as the sole developer of this project. Each component was rigorously tested and painstakingly refined through both automated and manual testing procedures under my oversight.As the developer, I firmly acknowledge and attest that the completed final product represents extensive human oversight, testing, refinement, and validation.I take full responsibility for the technical integrity and overall quality of the codebase, and I affirm that the AI-generated elements were only used as a tool for assistance, not as a substitute for human expertise.