Home energy, run with precision.
Wattlark reads your solar, battery, EV and electricity plan, then proposes the small schedule changes that lower your bill. You approve every one. Every change is logged.
- You approve every change
- Export your data any time
- No card needed
Good afternoon, Maya.
Good afternoon, Maya
Figures describe the model and the product rules in this concept, not measured customer results.
One system for the whole home.
Most energy apps show numbers and stop. Wattlark treats solar, storage, the car and the price list as one problem, then turns it into a short list of decisions.
From sign-up to the first saving.
A new household goes from describing the home to seeing measured savings in about two months. Each step is something you can see and reverse.
- Week 0
Describe the home in two minutes
Solar, battery, EV charger, heating and the price plan you are on. Wattlark builds a model of the house before a single device is connected.
- Week 1
It learns how the house really runs
Hourly generation, use and price are laid side by side, so the first thing you see is where energy and money are leaking.
- Week 2
Plain-language suggestions arrive
Each idea names the device, the change, the reason and the monthly effect. Nothing is hidden behind a score.
- Week 3
You approve, it carries out
One tap applies a schedule. Every decision is written to a household activity log and can be reversed.
- Month 2
The savings show up on the bill
Monthly summaries compare real use against a flat-rate reference, so progress is measured, not promised.
See where every kilowatt goes.
A Sankey diagram shows sources on the left and uses on the right, with ribbon width proportional to power. Drag the time slider in the app to preview any hour of the day.
- Solar, battery, grid, EV and home on one view
- Peak-price hours shaded on every chart
- Self-powered share and savings, updated live
What could it add for your home?
Move the sliders. The model is simple, every assumption is published, and the result is a range rather than a promise.
Likely range $1,016 to $1,693 · 51% of your bill · about $113 a month
- Appliance scheduling$175/yr
- Solar self-use$593/yr
- Battery on price$331/yr
- EV smart charging$255/yr
After the Home Plus plan ($12/mo, indicative): $1,210 a year.
An illustrative model, not a quote or a guarantee. Real results depend on your tariff, equipment and habits. See the assumptions.
The app does the explaining.
Every suggestion names the device, the change, the reason and the monthly effect. The phone app is built for the ten seconds a decision should take.
- Approve or dismiss from a notification
- Charge now overrides for a spontaneous trip
- Household members see only what the owner allows
Ready by 7:00 am
Charging 11 pm to 4 am at 9¢/kWh$128 saved in June
against a flat 18¢/kWh planBuilt to be inspected.
Four layers, drawn the way we build them. The posture table lists what is implemented, what is planned and what we do not claim.
Browser or phone
- Session cookie (httpOnly, SameSite)
- CSRF token on every write
- Theme is the only other cookie
Transport and browser policy
- TLS and HSTS (over HTTPS)
- Content-Security-Policy with nonces
- Frame denial, no MIME sniffing
- Rate limits on sign-in and forms
Household-scoped access
- Owner and member roles
- Queries keyed to the caller’s household
- Staff roles cannot open energy data
- Strict schema validation
Storage and evidence
- Parameterised statements only
- argon2id credential hashes
- Tamper-evident activity log
- Export your data from Settings
Open at the edges.
Equipment connections and a read-only API are on the roadmap. We show them honestly: planned means planned.
curl -s https://app.example.com/api/energy/live \
-H "Cookie: wl_session=…"{
"hour": 13.5,
"solarKw": 4.8,
"loadKw": 1.9,
"batteryKw": 2.1,
"gridKw": -0.8,
"socPct": 64,
"rateBand": "standard",
"today": { "generated": 21.4, "selfPoweredPct": 87 }
}Simple plans, honest about being early.
Indicative pricing while Wattlark is in development. No payments are taken in this showcase.
Questions, answered plainly.
Can I buy Wattlark today?
Not yet. It is a product concept in early access. The demo is fully working against fictional households so you can judge the experience and the controls.
Does Wattlark change my devices on its own?
No. Suggestions say what they change and what they expect to save, and nothing happens until an owner presses Apply. Every change is written to the activity log.
Who can see my energy data?
Members of your household, according to their role. Staff accounts can manage access and read the audit trail but have no permission to open household energy data.
Which security certifications do you hold?
None. We describe the controls that exist in the code and mark planned work as planned. We do not claim SOC 2, ISO 27001 or any other attestation.
Which inverters and chargers will it support?
Connectors are on the roadmap and will be scoped with early-access households. The demo uses a simulation in place of live device feeds.
How do I get access?
Use Contact sales or join the early-access list from the home page.
Be among the first households.
We open early access in small groups so we can listen. Leave your details and we will write when your group opens.