How is VoltKeep different from other Tesla data loggers?
VoltKeep is a server-free Tesla data logger for iPhone: it connects through the Tesla Fleet API, tracks routes, efficiency, phantom drain, and battery trends, and uses X25519 encryption with hashed VINs. TeslaMate is best if you want self-hosted Docker and Grafana dashboards; TeslaFi is cloud-based; HedgieMate and Mytess are iOS frontends for an existing TeslaMate server. If you want no server setup, a free plan, and AI analysis, VoltKeep is the simpler path (Japanese UI today; English UI in development).
The Tesla data logger landscape
Services that record and analyze Tesla vehicle data fall into four categories:
- Self-hosted open source — TeslaMate (Docker setup, free, requires technical knowledge)
- Frontend apps for self-hosted backends — HedgieMate / Mytess (iOS, require a separate TeslaMate server)
- Cloud services — TeslaFi (English, monthly subscription, no self-hosting)
- iOS native + direct Tesla connection — VoltKeep (no server, free plan, AI analysis)
Side-by-side comparison
| TeslaMate | HedgieMate | Mytess | TeslaFi | VoltKeep | |
|---|---|---|---|---|---|
| Type | Self-hosted OSS | iOS + TeslaMate | iOS + TeslaMate | Cloud | iOS + Tesla direct |
| Server hosting | Required | Required | Required | Not required | Not required |
| Monthly cost | VPS fees | VPS + $9.99 one-time | VPS + $9.9 one-time | $5 | Free or $2.99 |
| Languages | Partial | EN/KR/CN | JP focus | EN | JP today (EN in development) |
| Platform | Web browser | iOS / Mac / Watch | iOS 18+ | Web / iOS | iOS 17+ |
| AI analysis | — | — | — | — | Yes (Pro) |
| Data encryption | Self-managed | Self-managed | Self-managed | Operator-held | X25519 + hashed VIN |
| Phantom drain detection | Manual | Timeline view | Park history | Yes | Auto-detect + push |
What sets VoltKeep apart
1. No server required + direct Tesla official API connection
VoltKeep connects directly to Tesla's official Fleet Telemetry API. There's no need to run Docker / PostgreSQL / Grafana like TeslaMate, and no TeslaMate backend prerequisite like HedgieMate / Mytess. Install the app on your iPhone and sign in with your Tesla account — that's it.
2. Native iOS, available worldwide on the App Store
VoltKeep is distributed globally on the App Store — anyone can install it from the US, EU, UK, or Japan. The app currently ships with a Japanese-only UI; an English UI is in active development. Many of the screens (maps, charts, route visualization) are visual-first and usable today regardless of language; written copy will be English in an upcoming release.
3. X25519 public-key encryption + hashed VINs
Cloud services like TeslaFi store and can read your data on the server side. VoltKeep adopts an architecture where even our servers cannot decrypt your data (details in the data encryption FAQ).
4. Built-in AI analysis
While other data loggers stop at "graphing", VoltKeep uses a large language model to generate personalized improvement suggestions based on your real driving data (details in the AI driving score FAQ). AI output is currently in Japanese; multi-language output is on the roadmap.
Which service fits which user?
- TeslaMate — engineers comfortable with Docker who want full customization
- HedgieMate — already running TeslaMate, want Apple Watch glances
- Mytess — already running TeslaMate, want a Japanese-language frontend
- TeslaFi — happy with English, prefer a cloud service over a VPS, want US-ecosystem integration
- VoltKeep — Tesla owners who want no server, native iOS app, AI analysis, and privacy-first encryption (UI is Japanese today; English in development)
For a dedicated no-server landing page, see TeslaMate alternative for iOS without a server. For the long-form article: TeslaMate Alternatives on iOS — HedgieMate vs Mytess vs VoltKeep
Track your Tesla — no server, native iOS, AI-powered.
Start on the free plan; upgrade to Pro for $2.99/month when you need it.
Get it on the App Store